Outdoor Instrument Transformers

Buyer’s Guide
Contents

Table of Contents

Chapter - Page
Products Introduction A-2

Explanations B-1

Silicone Rubber (SIR) Insulators C-1

Design Features and Advantages

Current Transformers IMB D-1

Inductive Voltage Transformer EMF E-1

Capacitor Voltage Transformer CPA/CPB F-1

Technical Technical Catalogues

Information
CT IMB G-1

VT EMF H-1

CVT CPA/CPB (IEC) I-1

CVT CPA/CPB (ANSI) J-1

Optional

Cable Entry Kits - Roxtec CF 16 K-1

Quality Control and Testing L-1

Inquiry and Ordering Data M-1

A-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 Introduction

Day after day, all year around—

with ABB Instrument Transformers

ABB has been producing instrument trans- All instrument transformers supplied by ABB
formers for more than 60 years. Thousands are tailor-made to meet the needs of our
of our products perform vital functions in customers.
electric power networks around the world – An instrument transformer must be capable of
day after day, all year round. withstanding very high stresses in all climatic
Their main applications include revenue conditions. We design and manufacture our
metering, control, indication and relay pro- products for a service life of at least 30 years.
tection. Actually, most last even longer.

Product range Type Highest

Voltage for
Equipment
(kV)
Current Transformer IMB
Hairpin/Tank type IMB 36 - 800 36 - 765
Paper, mineral oil insulation, quartz filling

Inductive Voltage Transformer EMF

Paper, mineral oil insulation, quartz filling EMF 52 - 170 52 - 170

Capacitor Voltage Transformer CP

CVD: Mixed dielectric polypropylene-film and synthetic oil.
CP 72 - 800 72.5 - 765
EMU: Paper, mineral oil

Coupling Capacitors CCA or CCB

Intended for power line carrier applications CCA (high capacitance) 72 - 800 72.5 - 765
(identical to CVD above but without intermediate voltage
terminal.) CCB (extra high capacitance) 145 - 800 145 - 765

We are flexible and tailor each instrument transformer the needs of our customers. Sizes other than those mentioned
above can be supplied upon request.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 A-2

Explanations

Technical Specifications – General

Standard/Customer There are international and national standards, as well as customer specifications.
specification ABB High Voltage Products can meet most requirements, as long as we are aware of them. When in
doubt, please enclose a copy of your specifications with the inquiry.
Rated voltage The rated voltage is the maximum voltage (phase-phase), expressed in kV rms, of the system for
which the equipment is intended. It is also known as maximum system voltage.
Rated insulation level The combination of voltage values which characterizes the insulation of an instrument transformer with
regard to its capability to withstand dielectric stresses.
The rated value given is valid for altitudes ≤1000 m above sea level. A correction factor is introduced
for higher altitudes.
Lightning impulse test The lightning impulse test is performed with a standardized wave shape – 1.2/50 µs – for simulation of
lightning overvoltage.
Rated This test is to show that the apparatus can withstand the power frequency over-voltages that can
Power Frequency occur.
Withstand Voltage The Rated Power Frequency Withstand voltage indicates the required withstand voltage. The value is
expressed in kV rms.
Rated SIWL For voltages ≥300 kV the power-frequency voltage test is partly replaced by the switching impulse
test. The wave shape 250/2500 µs simulates switching over-voltage.

The rated Switching Impulse Withstand Level (SIWL) indicates the required withstand level phase-to-
earth (phase-to-ground), between phases and across open contacts. The value is expressed in kV as
a peak value.
Rated Chopped Wave The rated chopped wave impulse withstand level at 2 μs and 3 μs respectively, indicates the required
Impulse Withstand withstand level phase-to-earth (phase-to-ground).
voltage Phase-to-earth
Rated frequency The rated (power) frequency is the nominal frequency of the system expressed in Hz, which the instru-
ment transformer is designed to operate in.

Standard frequencies are 50 Hz and 60 Hz.

Other frequencies, such as 16 2/3 Hz and 25 Hz might be applicable for some railway applications.
Ambient temperature Average 24 hours ambient temperature above the standardized +35 °C influences the thermal design
of the transformers and must therefore be specified.
Installation altitude If installed >1000 m above sea level, the external dielectric strength is reduced due to the lower density
of the air. Always specify the installation altitude and normal rated insulation levels. ABB will make the
needed correction when an altitude higher than 1000 meters ASL is specified. Internal insulation is not
affected by installation altitude and dielectric routine tests will be performed at the rated insulation levels.
Creepage distance The creepage distance is defined as the shortest distance along the surface of an insulator between
high voltage and ground.

The required creepage distance is specified by the user in:

- mm (total creepage distance)
- mm/kV (creepage distance in relation to the highest system voltage).
Pollution level Environmental conditions, with respect to pollution, are sometimes categorized in pollution levels. Four
pollution levels are described in IEC 60815.
There is a relation between each pollution level and a corresponding minimum nominal specific creep-
age distance.

Pollution level Creepage distance

I - Light 16 mm/kV
II - Medium 20 mm/kV
III - Heavy 25 mm/kV
IV - Very Heavy 31 mm/kV
Wind load The specified wind loads for instrument transformers intended for outdoor normal conditions are
based on a wind speed of 34 m/s.

B-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 Explanations

Technical Specifications – Current Transformers

Currents The rated currents are the values of primary and secondary currents on which performance is based
Rated primary current The rated current (sometimes referred to as rated current, nominal current or rated continuous cur-
rent) is the maximum continuous current the equipment is allowed to carry.
The current is expressed in A rms.

The maximum continuous thermal current is based on average 24 h ambient temperature of +35 °C.

It should be selected about 10 - 40% higher than the estimated operating current.
Closest standardized value should be chosen.
Extended current ratings A factor that multiplied by the rated current gives the maximum continuous load current and the limit
for accuracy. Standard values of extended primary current are 120, 150 and 200% of rated current.
Unless otherwise specified, the rated continuous thermal current shall be the rated primary current.
Rated secondary current The standard values are 1, 2 and 5 A. 1 A gives an overall lower burden requirement through lower
cable burden.
Rated short-time thermal The rated short-time withstand current is the maximum current (expressed in kA rms) which the
current (Ith) equipment shall be able to carry for a specified time duration.

Standard values for duration are 1 or 3 s. Ith depends on the short-circuit power of the grid and can
be calculated from the formula: Ith = Pk (MW) / Um (kV) x √3 kA.
Rated dynamic current The dynamic short-time current is according to IEC, Idyn = 2.5 x Ith
(Idyn) and according to IEEE, Idyn = 2.7 x Ith
Reconnection The current transformer can be designed with either primary or secondary reconnection or a com-
bination of both to obtain more current ratios.
Primary reconnection The ampere-turns always remain the same and thereby the load capacity (burden) remains the
same. The short-circuit capacity however is reduced for the lower ratios. Primary reconnection is
available for currents in relation 2:1 or 4:2:1. See pages I-5 and I-9.
Secondary reconnection Extra secondary terminals (taps) are taken out from the secondary winding. The load capacity
drops as the ampere-turns decrease on the taps, but the short-circuit capacity remains constant.
Each core can be individually reconnected.
Burden and
Accuracy Class (IEC)

Burden The external impedance in the secondary circuit in ohms at the specified power factor. It is usu-
ally expressed as the apparent power – in VA -, which is taken up at rated secondary current. It
is important to determine the power consumption of connected meters and relays including the
cables. Unnecessary high burdens are often specified for modern equipment. Note that the accu-
racy for the measuring core, according to IEC, can be outside the class limit if the actual burden is
below 25% of the rated burden.

Accuracy The accuracy class for measuring cores is according to the IEC standard given as 0.2, 0.2S, 0.5,
0.5S or 1.0 depending on the application. For protection cores the class is normally 5P or 10P.
Other classes are quoted on request, e.g. class PR, PX, TPS, TPX or TPY.

Rct The secondary winding resistance at 75 °C

Instrument Security To protect meters and instruments from being damaged by high currents, an FS factor of 5 or 10 often
Factor (FS) is specified for measuring cores. This means that the secondary current will increase a maximum of 5 or
10 times when the rated burden is connected. FS10 is normally sufficient for modern meters.

Accuracy Limit Factor The protection cores must be able to reproduce the fault current without being saturated.
(ALF) The overcurrent factor for protection cores is called ALF. ALF = 10 or 20 is commonly used.

Both FS and ALF are valid at rated burden only. If lower burden the FS anf ALF will increase
Burden and Accuracy More detailed information about standards other than IEC can be found in our Application
Class for other standards, Guide, Outdoor Instrument Transformers, Catalog Publication 1HSM 9543 40-00en or in the
such as ANSI, IEEE, etc. actual standard.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 B-2

Explanations

Technical Specifications – Voltage Transformers

Voltages The rated voltages are the values of primary and secondary voltages on which the performance is
based.
Voltage factor (Vf) It is important that the voltage transformer, for thermal and protection reasons, can withstand and
reproduce the continuous fault overvoltages that can occur in the net. The over-voltage factor is
abbreviated as Vf.
The IEC standard specifies a voltage factor of 1.2 continuously and simultaneously 1.5/30 sec. for
systems with effective grounding with automatic fault tripping, and 1.9/8 hrs for systems with insu-
lated neutral point without automatic ground fault systems.
Accuracy, according to IEC, for measuring windings is fulfilled between 0.8 and 1.2 x rated voltage
and for protection windings up to the voltage factor (1.5 or 1.9 x rated voltage).
Reconnection The voltage transformer can be designed with secondary reconnection.
Secondary reconnection means that extra secondary terminals (taps) are taken out from the
secondary winding(s).
Burden and accuracy
class
Burden The external impedance in the secondary circuit in ohms at the specified power factor. It is usually
expressed as the apparent power – in VA -, which is taken up at the rated secondary voltage.
(See Current Transformers above).

The accuracy class for measuring windings, according to IEC, is given as 0.2, 0.5 or 1.0 depending
on the application. A rated burden of around 1.3-1.5 times the connected burden will give maximum
accuracy at the connected burden.
For protection purposes the class is normally 3P or 6P

Simultaneous burden Metering windings and protection windings not connected in open delta are considered as simultane-
(IEC) ously loaded. A protection winding connected in open delta is not considered as a simultaneous load.

Thermal limit burden is the total power the transformer can supply without excessively high tempera-
Thermal limit burden ture rise. The transformer is engineered so that it can be loaded with the impedance corresponding to
the load at rated voltage, multiplied by the square of the voltage factor. This means that at a voltage
factor of 1.9/8h, for example, the limit burden = total rated burden x 1.92.
The transformer cannot be subjected to a higher limit burden without being loaded higher than the
rated burden. Consequently, because of loading considerations, it is unnecessary to specify a higher
thermal limit burden.

The voltage drop in an external secondary circuit (cables and fuses) can have a significantly larger
Voltage drop influence on the ratio error than incorrect burden.

Ferroresonance is a potential source of transient overvoltage. Three-phase, single-phase switching,

Ferro-resonance blown fuses, and broken conductors can result in overvoltage when ferroresonance occurs between
the magnetizing impedance of a transformer and the system capacitance of the isolated phase or
phases. For example, the capacitance could be as simple as a length of cable connected to the
ungrounded winding of a transformer. Another example of ferroresonance occurring is when an induc-
tive voltage transformer is connected in parallel with a large grading capacitor across the gap of a
circuit breaker.

Ferroresonance is usually known as a series resonance.

B-3 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 Explanations

Technical Specifications – Voltage Transformers

Additional for
Capacitor Voltage
Transformers (CVT)
and Capacitor Voltage
Divider (CVD)
Capacitance Requirements for capacitance values can be applicable when using the CVT for communication over
phase - ground lines (for relay functions or remote control).
PLC = Power Line Carrier.
Higher capacitance => Smaller impedance for signal.
Frequency ranges 50-500 kHz. The line matching unit can be adjusted to any capacitance.

The lower applied frequency decide the minimum capacitance of coupling capacitor.

More information More detailed information about instrument transformers can be found in our
regarding instrument Application Guide, Outdoor Instrument Transformers. Catalog Publication 1HSM 9543 40-00en
transformers

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 B-4

Silicone Rubber Insulators

Silicone Rubber as an Insulator

Wide range of instrument ABB Manufacturing Technique
transformers with silicone rubber The patented helical extrusion moulded silicone
(SIR) insulators rubber insulators without joints (chemical bounds
ABB AB, High Voltage Products can supply between spirals) minimizes electrical field con-
most of our instrument transformers with centrations and reduces build-up of contamina-
patented helical extrusion-moulded silicone tion. The cross-laminated fiberglass tube inside
rubber insulation. the insulator provides high mechanical strength.

CT IMB 36-800 kV Completed Tests

VT EMF 52-170 kV The silicone material used for ABB AB, High
CVT CPA/CPB 72-800 kV Voltage Products, Instrument Transformers is
approved according to IEC and ANSI/IEEE stan-
Why Silicone Rubber Insulators? dards.
Ceramic (porcelain) insulators have performed
well for several decades, but one of the dis- Tests performed:
advantages with porcelain is its fragility. • Accelerated ageing test (1,000 h)
Listed below are some of the advantages • Lightning impulse test, wet power frequency
of silicone rubber insulators compared to test and wet switching impulse test
porcelain: • Short circuit test
• Non-brittle • Temperature rise test
• Minimum risk for handling and transport
damages Color
• Minimum risk for vandalism The (SIR) insulators for the instrument trans-
• Light-weight formers are supplied in a light gray color.
• Explosion safety
• Excellent pollution performance Deliveries
• Minimum maintenance in polluted areas ABB in Ludvika has supplied instrument trans-
• Hydrophobic formers with (SIR) insulators for the most severe
conditions, from marine climate to desert and/or
There are several polymeric insulator polluted industrial areas.
materials available, of which silicone A reference list can be provided on request.
has proven to be superior

Comparison of Polymeric Insulators

Epoxy EP-rubber Silicone
Brittle Low Excellent Excellent
Insulation Fair Good Excellent
Weight Good Excellent Excellent
Mech. strength Excellent Good Excellent
Safety Good Good Excellent
Earthquake Good Excellent Excellent
Handling Good Excellent Excellent

Maintenance Fair Fair Excellent

Ageing Fair Good Excellent
UV-resistance Good Good Excellent

Experience of Material
ABB has used silicone rubber (SIR) insulators More Information
since 1985, starting with surge arresters, and For additional information please refer to
has gained considerable experience. publication 1HSM 9543 01-06en.

C-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 s
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ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 C-2

Design Current Transformer

IMB Design Features and Advantages

ABB’s oil minimum current transform- around the whole periphery of the core. The
ers type IMB is based on a hairpin leakage reactance in the winding and also
design (shape of the primary conduc- between extra tapping is therefore negligible.
tor) also known as tank type. The Impregnation
basic design has been used by ABB Heating in a vacuum dries the windings. After
for 60 years, with more than 160,000 assembly all free space in the transformer
units delivered. (app. 60%) is filled with clean and dry quartz
grain. The assembled transformer is vacuum-
The design corresponds with the demands treated and impregnated with degassed min-
of both the IEC and IEEE standards. Special eral oil. The transformer is always delivered
design solutions to meet other standards oil-filled and hermetically sealed.
and/or specifications are also available.
The unique filling with quartz grains satu- Tank and Insulator
rated in oil gives a resistant insulation in a The lower section of the transformer consists
compact design where the quantity of oil is of an aluminum tank in which the secondary
kept to a minimum windings and cores are mounted. The insu-
The IMB transformer has a very flexible lator, mounted above the transformer tank,
design that, for example, allows large and/or consists as standard of high-grade brown-
many cores. glazed porcelain. Designs using light gray
porcelain or silicon rubber can be quoted on
Primary Winding request.
The primary winding consists of one or more
parallel conductor of aluminum or copper The sealing system consists of O-ring gas-
designed as a U-shaped bushing with volt- kets.
age grading capacitor layers.
The insulation technique is automated to give Expansion System
a simple and controlled wrapping, which im- The IMB has an expansion vessel placed on
proves quality and minimizes variations. top of the insulator. A hermetically sealed
The conductor is insulated with a special expansion system, with a nitrogen cushion
paper with high mechanical and dielectric compressed by thermal expansion of the oil,
strength, low dielectric losses and good is used in the IMB as the standard design.
resistance to ageing. An expansion system with stainless steel ex-
This design is also very suitable for primary pansion bellows can be quoted on request.
windings with many primary turns. This is
used when the primary current is low, for On Request – Capacitive Voltage Tap
instance unbalance protection in capacitor The capacitive layers in the high voltage insu-
banks. (Ex. ratio 5/5A) lation can be utilized as a capacitive voltage
divider. A tap is brought out from the second
Cores and Secondary Windings to last capacitor layer through a bushing on
The IMB type current transformers are flex- the transformer tank (in the terminal box or in
ible and can normally accommodate any a separate box, depending on the IMB tank
core configuration required. design). An advantage of the capacitive ter-
Cores for metering purposes are usually minal is that it can be used for checking the
made of nickel alloy, which features low condition of the insulation through dielectric
losses (= high accuracy) and low saturation loss angle (tan delta) measurement without
levels. disconnecting the primary terminals. The tap
The protection cores are made of high- can also be used for voltage indication, syn-
grade oriented steel strip. Protection cores chronizing or similar purpose, but the output
with air gaps can be supplied for special is limited by the low capacitance of the lay-
applications. ers.
The load connected must be less than
The secondary winding consists of double 10 kohms and the tap must be grounded
enameled copper wire, evenly distributed when not in use.

D-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Current Transformer Design

IMB Design Features and Advantages

Climate Seismic Strength
The transformers are designed for, and are The IMB has a mechanically robust construc-
installed in, widely shifting conditions, from tion, designed to withstand high demands
polar to desert climates all over the world. of seismic acceleration without the need of
dampers.
Service Life
The IMB transformer is hermetically sealed
and the low and even voltage stress in the 1 8
primary insulation gives a reliable product
with expected service life of more than 30 2 9
years. The IMB and its predecessors have
since the 1930s been supplied in more than 10
160,000 units.
3
Expansion System
The expansion system, with a nitrogen gas
cushion, increases operating reliability and
minimizes the need of maintenance and
inspections. This type of expansion system
can be used in the IMB since the quartz filling
reduces the oil volume and a relatively large
gas volume minimizes pressure variations. 4
For higher rated currents an expansion
vessel with external cooling fins is used to
increase the cooling area and heat dissipa-
tion to the surrounding air.
An expansion system with stainless steel
expansion bellows surrounded by the oil can
be quoted on request.

Quartz Filling
Minimizes the quantity of oil and provides a
mechanical support for the cores and prima-
ry winding during transport and in the event
of a short-circuit.
5
Flexibility
The IMB covers a wide range of primary cur-
rents up to 4,000 A. It can easily be adapted 6
for large and/or many cores by increasing the 7
volume of the tank.
11
Resistance to Corrosion
The selected aluminum alloys give a high
degree of resistance to corrosion, without the Current Transformer Type IMB
need of extra protection. Anodized parts for
IMB 36-170 kV can be offered on request. 1. Gas cushion 6. Secondary terminal box
2. Oil filling unit (hidden) 7. Capacitive voltage tap
For use in extreme environments
3. Quartz filling (on request)
IMB >170 kV can be delivered with a protec-
4. Paper-insulated primary 8. Expansion vessel
tive painting. conductor 9. Oil sight glass
5. Cores/secondary 10. Primary terminal
windings 11. Ground terminal

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 D-2

Design Inductive Voltage Transformer

EMF Design Features and Advantages

ABB’s inductive voltage transformers former consists of an aluminum tank in which
are intended for connection between the winding and core are placed. The tank
phase and ground in networks with consists of selected aluminum alloys that
give a high degree of resistance to corrosion,
insulated or direct-grounded neutral without the need of extra protection. Anod-
points. ized details can be offered on request. The
sealing system consists of O-ring gaskets.
The design corresponds with the require- The insulator, in its standard design, con-
ments in the IEC and IEEE standards. Spe- sists of high quality, brown glazed porcelain.
cial design solutions to meet other standards The voltage transformers can also be sup-
and customer requirements are also pos- plied with silicone rubber insulators.
sible.
The transformers are designed with a low Expansion System
flux density in the core and can often be The EMF has an expansion vessel placed
dimensioned for 190% of the rated voltage on the top section of the porcelain. The EMF
for more than 8 hours. has a closed expansion system, without
moving parts and with a nitrogen cushion,
Primary Windings that is compressed by the expansion of the
The primary winding is designed as a multi- oil. A prerequisite for this is that the quartz
layer coil of double enameled wire with layer sand filling reduces the oil volume, and the
insulation of special paper. Both ends of the use of a relatively large gas volume, which
windings are connected to metal shields. gives small pressure variations in the system.

Secondary and Tertiary Windings Ferro-Resonance

In its standard design the transformer has a The design of the EMF notably counteracts
secondary measurement winding and a ter- the occurrence of ferro-resonance phenom-
tiary winding for ground fault protection, but ena:
other configurations are available as required. - The low flux in the core at the operating
(2 secondary windings in a design according voltage gives a large safety margin against
to IEEE standard) saturation if ferro-resonance oscillations
The windings are designed with double should occur.
enameled wire and are insulated from the - The flat magnetization curve gives a
core and the primary winding with press- smooth increase of core losses, which
board (presspahn) and paper. results in an effective attenuation of the ferro-
The windings can be equipped with addi- resonance.
tional terminals for other ratios (taps). If the EMF transformer will be installed in a
network with a high risk for ferro-resonance,
Core it can, as a further safety precaution, be
The transformer has a core of carefully se- equipped with an extra damping burden, on
lected material, to give a flat magnetization a delta connected tertiary winding. See the
curve. The core is over-dimensioned with a figure below.
very low flux at operating voltage.

Impregnation
Heating in a vacuum dries the windings. After
assembly, all free space in the transformer
(approximately 60%) is filled with clean and
dry quartz grains. The assembled trans-
former is vacuum-treated and impregnated
with degassed mineral oil. The transformer
is always delivered oil-filled and hermetically
sealed.

Tank and Insulator

EMF 52-170: The lower section of the trans- Damping of ferro-resonance

E-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Inductive Voltage Transformer Design

EMF Design Features and Advantages

Climate
1
These transformers are designed for, and are
installed in a wide range of shifting condi-
9
tions, from polar to desert climates all over
the world. 2
3
Service Life
The low and even voltage stresses in the
primary winding give a reliable product with
a long service life. EMF and its predecessors
have been supplied in more than 55,000 4
units since the 1940s.

Expansion System 5
The expansion system based on the nitrogen
cushion gives superior operating reliability
and minimizes the need of maintenance and
inspection of the transformer.

Quartz Filling
Minimizes the quantity of oil and provides a
10
mechanical support to the cores and primary
winding. 11
6
Resistance to Corrosion 12
EMF 52-170: The selected aluminum alloys
give a high degree of resistance to corrosion 7 13
without the need of extra protection. Anod- 14
ized details can be offered on request. 8
15
Seismic Strength
EMF is designed to withstand the high de- Voltage transformer EMF 145
mands of seismic acceleration.
1. Primary terminal 9. Expansion system
2. Oil level sight glass 10. Paper insulation
3. Oil 11. Tank
4. Quartz filling 12. Primary winding
5. Insulator 13. Secondary windings
6. Lifting lug 14. Core
7. Secondary terminal box 15. Ground connection
8. Neutral end terminal

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 E-2

Design Capacitor Voltage Transformer

CPA and CPB Design Features

ABB’s capacitor voltage transformers The capacitor elements are designed with
(CVTs) and coupling capacitors are respect to the demands made by revenue
intended for connection between metering, and their active component con-
sists of aluminum foil, insulated with paper/
phase and ground in networks with polypropylene film, impregnated by a PCB-
isolated or grounded neutral. free synthetic oil, which has better insulat-
ing properties than normal mineral oil and is
ABB offers a world-class CVT with superior required for the mixed dielectric. Due to its
ferro-resonance suppression and transient unique proportions between paper and poly-
response. propylene film, this dielectric has proven itself
The design corresponds to the require- virtually insensitive to temperature changes.
ments of IEC and ANSI and all national
standards based on them. Special designs to Electromagnetic Unit
meet other standards and customer specifi- The voltage divider and the electromagnetic
cations are also available. unit are connected by internal bushings,
Due to the design of the capacitor ele- which is necessary for applications with high
ments, described below, CPA and CPB accuracy.
are, with regard to temperature stability and The EMU has double-enameled copper
accuracy, equivalent to inductive voltage windings and an iron core made of high qual-
transformers. ity steel sheet and is oil insulated in a hermet-
ically sealed aluminum tank with mineral oil.
Difference and Composition of The primary coil is divided into a main
CPA and CPB winding, and a set of externally connected
A capacitor voltage transformer with an elec- trimming windings. The nominal intermediate
tromagnetic unit (EMU), type EOA is called voltage is approx. 22/√3 kV.
CPA and with EMU, type EOB is called CPB. The EOA and EOB have a reactor, which is
The design of the EOA and EOB is basically connected in series between the voltage di-
identical, however the EOB has a larger tank vider and the high voltage end of the primary
and core, with space for larger windings, winding. This reactor compensates for the
making it capable of withstanding higher bur- shift in phase angle caused by the capacitive
dens. voltage divider. The inductive reactances are
Our standard voltage divider, type designa- tuned individually on each transformer before
tion CSA (high capacitance) or CSB (extra accuracy testing.
high capacitance) is mounted on an electro-
magnetic unit (EMU), making a complete For special applications, HVDC stations,
capacitor voltage transformer. metering of harmonics, etc. there is another
A coupling capacitor (without an EMU) is type of EMU available, the EOAL. The EOAL
called CCA (high capacitance) or CCB (extra is basically an EOA but without a separate
high capacitance). compensating reactor. In the EOAL, the
compensating reactor and transformer is
Capacitor Voltage Divider combined into one piece, which gives several
The capacitor voltage divider (CVD) consists advantages.
of one or two capacitor units, assembled on The useful frequency range is wider since
top of each other. Each unit contains a large the internal resonance frequency of the
number of series-connected, oil-insulated EMU is higher than for an EOA or EOB. The
capacitor elements. The units are completely already excellent transient response of the
filled with synthetic oil, which is kept under EOA and EOB is improved even further.
a slight overpressure by the design of the However the EOAL is limited to burdens
expansion system. O-ring seals are used lower than the EOA.
throughout the design.

F-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Capacitor Voltage Transformer Design

CPA and CPB Design Features

Climate
These transformers are designed for, and are 8
installed in widely varying conditions, from
arctic to desert climates, on every continent.
1
Ferro-resonance
The low induction, combined with an effi-
cient damping circuit, gives a safe and stable
damping of ferro-resonance at all frequencies
and voltages up to the rated voltage factor;
see page I-2 or J-2. 2

Life Time
The low voltage stress within the capacitor
elements ensures a safe product with an
expected service life of more than 30 years.

Transient Properties
The high intermediate voltage and high ca-
pacitance result in good transient properties.

Adjustment
The adjustment windings for ratio adjust-
ment are accessible in the terminal box.

Power Line Carrier 3

9
The CPA and CPB are designed with the
compensating reactor connected on the high
voltage side of the primary winding, providing 4 10
the option of using higher frequencies (> 400 11
5
kHz) for power line carrier transmission.
6
Stray Capacitance
The design with the compensating reactor 7
on the high voltage side of the main winding
ensures less than 200 pF stray capacitance, 12
which is the most stringent requirement in
the IEC standard for carrier properties.

Stability Capacitor Voltage Divider CSA or CSB

The CPA and CPB have a high Quality Fac- 1. Expansion system
tor, as a result of their comparatively high 2. Capacitor elements
capacitance, combined with a high interme- 3. Intermediate voltage bushing
8. Primary terminal, flat 4-hole Al-pad
diate voltage.
10. Low voltage terminal (for carrier frequency use)
The Quality Factor = Cequivalent x U²intermediate is
a measure of the accuracy stability and the Electromagnetic unit EOA or EOB
transient response. The higher this factor, the 4. Oil level glass
better the accuracy, and the better the 5. Compensating reactor
transient response. 6. Ferroresonance damping circuit
7. Primary and secondary windings
9. Gas cushion
11. Terminal box
12. Core

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 F-2

 s
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F-3 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Current Transformers IMB 36-800 kV

Tank Type Current Transformer IMB

For revenue metering and protection The unique quartz filling minimizes the
in high voltage networks, the oil-paper quantity of oil and provides a mechanical
insulated current transformer IMB is the support to the cores and primary winding.
most sold transformer in the world. Due to the low center of gravity the IMB
is very suitable for areas with high seismic
• Designed for widely shifting conditions, activity.
from polar to desert climate From international studies we can see
• Flexible tank type design allows large that the IMB design is a reliable product
and/or many cores (failure rate more than 4 times lower than
average) with no need for regular main-
tenance.

Brief Performance Data

Installation Outdoor

Design Tank (Hairpin) type

Insulation Oil-paper-quartz
Highest voltage for 36-765 kV
equipment

Max primary current Up to 4000 A

Short-circuit current Up to 63kA/1 sec

Insulators Porcelain
On request silicon rubber
(SIR) up to 550 kV
Creepage distance ≥ 25 mm/kV
(Longer on request)
Service conditions
Ambient temperature -40 °C to +40 °C
(Others on request)

Design altitude Maximum 1000 m

(Others on request)

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 G-1

IMB 36-800 kV Outdoor Current Transformers

Tank Type Current Transformer IMB

Material Maintenance
All external metal surfaces are made of an The maintenance requirements are small, as
aluminum alloy, resistant to most known en- IMB is hermetically sealed and designed for a
vironment factors. Bolts, nuts, etc. are made service life of more than 30 years. Normally it
of acid-proof steel. The aluminum surfaces is sufficient to check the oil level and that no
do not normally need painting. We can, how- oil leakage has occurred. Tightening of the
ever, offer anodized or a protective paint. primary connections should be checked oc-
casionally to avoid overheating.
Creepage Distance A more detailed check is recommended
As standard, IMB is offered with creepage after 20-25 years of service. A manual for
distance ≥ 25 mm/kV. Longer creepage dis- conditional monitoring can be supplied on
tance can be provided on request. request. This gives further guarantees for
continued problem-free operation.
Mechanical Stability The methods and the scope of the checks
The mechanical stability gives sufficient depend greatly on the local conditions.
safety margins for normal wind loads and Measurements of the dielectric losses of the
terminal forces. Static force on primary ter- insulation (tan delta-measurement) and/or
minal may be up to 6,000 N in any direction. oil sampling for dissolved gas analysis are
The IMB will also withstand most cases of recommended check methods.
seismic stress. Maintenance instructions are supplied with
each delivery.
Rating Plates
Rating plates of stainless steel with engraved Oil Sampling
text and the wiring diagram are mounted on This is normally done through the oil-filling
the cover of the terminal box. terminal. If required, we (ABB, HV Compo-
nents) can offer other solutions and equip-
Transport - Storage ment for oil sampling.
The IMB 36 - 145 is normally transported
(3-pack) and stored vertically. If horizontal Impregnation Agent
transport is required this must be stated on Oil of type Nynäs Nytro 10 XN (according to
the order. IEC 60296 grade 2) is free of PCB and other
The IMB 170 - 800 is packed for horizontal heavily toxic substances and has a low im-
transport (1-pack). pact on the environment.
Long-term storage of more than six months
should preferably be made vertically. If this is Disposal
not practical please contact ABB. After separating the oil and quartz the oil can
be burned in an appropriate installation. Oil
Arrival Inspection - Assembly residue in the quartz can be burnt, where
Please check the packaging and contents after the quartz can be deposited.
with regard to transport damage on arrival. In The disposal should be carried out in accor-
the event of damage to the goods, contact dance with local legal provisions.
ABB for advice before further handling of the The porcelain can, after it has been crush-
goods. Any damage should be documented ed, be used as landfill.
(photographed). The metals used in the transformer can
The transformer must be assembled on a be recycled. To recycle the aluminum and
flat surface. An uneven surface can cause copper in the windings, the oil-soaked paper
misalignment of the transformer, with the risk insulation should be burnt.
of oil leakage.
Assembly instructions are provided with
each delivery.

G-2 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Current Transformers IMB 36-800 kV

Tank Type Current Transformer IMB

Primary Terminals
IMB 36 – 800 is as standard equipped with
aluminum bar terminals, suitable for IEC and
NEMA specifications. Other customer speci-
fic solutions can be quoted on request.
Maximum static and dynamic force on the
terminal is 6,000 and 8,400 N respectively.
Maximum torsional moment is 1,000 Nm.

Secondary Terminal Box and

Secondary Terminals Dangerous Voltage

The transformer is equipped with a secon-

Must not be opened
while in service

dary terminal box, protection class IP 55,

according to IEC 60529. This box is
equipped with a detachable, undrilled gland
1S1 1S2 1S3 1S4 2S1 2S2 2S3 2S4 3S1 3S2 3S3 3S4

plate, which on installation can be drilled for

1S1 1S2 1S3 1S4 2S1 2S2 2S3 2S4 3S1 3S2 3S3 3S4

cable bushings.
The terminal box is provided with a drain.
The standard terminal box can accommo-
date up to 30 terminals of the type PHOENIX Standard for IMB 36 - 170
10N for cross section <10 mm2. Other types
of terminals can be quoted on request.
A larger terminal box with space for more
secondary terminals or other equipment,
such as heater or protective spark gaps, is
supplied when needed.

Standard for IMB 245 - 800

Ground (Earth) Terminal

The transformer is normally equipped with
a ground clamp with a cap of nickel-plated
brass, for conductors 8-16 mm
(area: 50-200 mm2), which can be moved to
either mounting foot.
A stainless steel bar, 80 x 145 x 8 mm, can IMB 36-170 IMB 245-420
be quoted on request. The bar can be supp-
lied undrilled or drilled according to IEC or
NEMA standards.
The ground terminal for the secondary
windings is located inside the terminal box.

IMB 420-550 IMB 420-800

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IMB 36-800 kV Outdoor Current Transformers

Design Data
Maximum Rated Current and Short-time Current
Type Normal Cooling Cooler Maximum Maximum Maximum
current flanges short-time short-time dynamic
current current current
1 sec 3 sec
A A A kA kA kA peak value
IMB 36-170 2400 - 3150 63 40 170
1200 - 1500 40 40 108
400 - - 31,5 18 85
150 - - 16 9 43
IMB 245 2000 2400 3150 63 63 170
1000 1200 1500 40 40 108
300 - - 31,5 18 85
150 - - 16 9 45
IMB 300-420 2500 - 3150 63 63 170
1200 - 1500 40 40 108
IMB 420-550 2500 - 4000 63 40 170
1200 - 2000 40 40 108
IMB 800 - - 4000 63 40 170
Other types of primary conductors can be supplied on request
Maximum continuous primary current = load factor x primary rated current related to a daily mean temperature that does not exceed 35 oC
Primary winding can be designed with reconnection alternative between two or three primary rated currents with a ratio of 2:1 or 4:2:1

Test Voltages IEC 60044-1

Type Highest voltage AC voltage test, Lightning Switching RIV test Max RIV
for equipment 1 minute impulse impulse voltage level
(Um) wet/dry 1.2/50 μs 250/2500 μs
kV kV kV kV kV Max. µV
IMB 36 36 70/70 170 - - -
IMB 72 72,5 140/140 325 - - -
IMB 123 123 230/230 550 - 78 2500
IMB 145 145 275/275 650 - 92 2500
IMB 170 170 325/325 750 - 108 2500
IMB 245 245 460/460 1050 - 156 2500
IMB 300 300 -/460 1050 850 191 2500
IMB 362 362 -/510 1175 950 230 2500
IMB 420 420 -/630 1425 1050 267 2500
IMB 550 550 -/680 1550 1175 334 2500
IMB 800 765 -/975 2100 1550 486 2500
Test voltages above applies at <1000 meters above sea level.

Test Voltages IEEE C 57.13

Type Highest Power frequency AC-test Wet, Lightning Chopped RIV test Max RIV
system voltage applied voltage test 10 sec impulse (BIL) impulse voltage level 1)
1.2/50 µs
kV kV kV kV Max. kV kV µV
IMB 36 36.5 70 70 200 230 21 125
IMB 72 72.5 140 140 350 400 42 125
IMB 123 123 230 230 550 630 78 250
IMB 145 145 275 275 650 750 92 250
IMB 170 170 325 315 750 865 108 250
IMB 245 245 460 445 1050 1210 156 250
IMB 362 362 575 - 1300 1500 230 250
IMB 550 550 800 - 1800 2070 334 500
1) Test procedure according to IEC, 2) Test voltages above applies at <1000 meters above sea level

G-4 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Current Transformers IMB 36-800 kV

Design Data
Nominal Flashover and Creepage Distance (Porcelain)
Normal creepage distance 25 mm/kV Long creepage distance 31 mm/kV
(Min. values) (Min. values)
Type Flashover Total Protected Flashover Total Protected
distance creepage creepage distance creepage creepage
distance distance distance distance
mm mm mm mm mm mm
IMB 36 - - - 630 2248 1020
IMB 72 - - - 630 2248 1020
IMB 123 1120 3625 1400 1120 4495 1860
IMB 145 1120 3625 1400 1120 4495 1860
IMB 170 - - - 1330 5270 2200
IMB 1701 - - - 1600 6525 2740
IMB 245 1915 6740 2850 2265 8490 3685
IMB 300 2265 8250 3495 2715 10430 4645
IMB 362 2715 10430 4645 3115 12480 5630
IMB 420 3115 12480 5630 3635 14325 6465
IMB 420 3220 11550 4800 3820 15280 6870
IMB 550 3820 15280 6870 4715 18944 8340
IMB 800 5220 18624 7950 - - -
Note: Long creepage distance effects dimensions A, B, D (see dimensions)
1) 38 mm/kV for 170 kV system voltage and 45 mm/kV for 145 kV system voltage is available.

Standard accuracy Classes.

Current transformers of the type IMB are designed to comply with the following accuracy
classes. Other classes can be quoted on request.

IEC 60044 – 1 IEEE C57.13 / IEEE C57.13.6

Class Application Class Application
0.2 0.15 Precision revenue metering
Precision revenue metering
0.2S 0.3 Standard revenue metering
0.5 Standard revenue metering 0.6 Metering
0.5S Precision revenue metering 1.2 Metering
1.0 Industrial grade meters C100 Protection
3.0 Instruments C200 Protection
5.0 Instruments C400 Protection
5P Protection C800 Protection
5PR Protection
10P Protection
10PR Protection
PX Protection
TPS Protection
TPX Protection
TPY Protection

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IMB 36-800 kV Outdoor Current Transformers

Design Data
Burdens
Our current transformer IMB has a very flexible design allowing large burdens. However, it is
important to determine the real power consumption of connected meters and relays including
the cables. Unnecessary high burdens are often specified for modern equipment. Note that
the accuracy for the measuring core, according to IEC, can be outside the class limit if the
actual burden is below 25% of the rated burden.

Over-Voltage Protection Across Primary Winding

The voltage drop across the primary winding of a current transformer is normally very low.
At rated primary current it is only a couple of volts and at short-circuit current a few hundred
volts.
If a high frequency current or voltage wave passes through the primary winding can, due to
the winding inductance, high voltage drops occur. This is not dangerous for a current trans-
former with a single-turn primary winding, but for multi-turn primaries may it lead to dielectric
puncture between the primary turns.
It is therefore ABB’s practice to protect the primary winding in multi-turn designs with a
surge arrester connected in parallel with the primary.

Standard design of IMB current transformer is without surge arrester. Surge arrester of type
POLIM – C 1.8 will however be supplied automatically when needed.

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Outdoor Current Transformers IMB 36-800 kV

Design and Shipping Data

Dimensions
A B C D E F G H J K
Type Total Height to Ground Flashover Length Dimen- Height to Spac-
height primary level distance across sion of terminal ing for
terminal height primary bottom box mounting
terminal tank holes
bushing
mm mm mm mm mm mm mm mm mm mm
IMB 361 2000 1635 840 630 475 270 410 460 60 410
IMB 721 2000 1635 840 630 475 270 410 460 60 410
IMB 123 1
2490 2125 840 1120 475 270 410 460 60 410
IMB 1451 2490 2125 840 1120 475 270 410 460 60 410
IMB 1701 2700 2335 840 1330 475 270 410 460 60 410
IMB 2452 3630 3045 965 1915 476 270 395 885 485 450
IMB 3002 4150 3405 965 2265 491 270 395 885 485 450
IMB 362 2
4600 3855 965 2715 491 270 395 885 485 450
IMB 4202 5000 4255 965 3115 491 270 395 885 485 450
IMB 4203 5505 4760 1365 3220 491 320 380 1040 783 500
IMB 4204 5580 4790 1390 3220 526 360 410 1105 805 600
IMB 5503 6105 5360 1365 3820 491 320 380 1040 783 500
IMB 550 4
6180 5390 1390 3820 526 360 410 1105 805 600
IMB 8004 8540 6790 1390 5220 526 360 410 1105 805 600
1) Standard tank, 2) Hexagonal tank, 3) Octagon tank, 4) HV tank E

A
D
D

B
A
B

C
C

25
25

K K
J

G F
H
K
K H
F

IMB 36 - 170 IMB 245

G

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IMB 36-800 kV Outdoor Current Transformers

Design and Shipping Data

E

E
D

A
B
C
J

25

K K
D

H
K
B
A
F
G

IMB 300 - 420

C
J

30

K K
K

IMB 420 - 550

F G

G-8 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Current Transformers IMB 36-800 kV

Design and Shipping Data

E

A
B
C

30

K K
K

IMB 420 - 550 F G

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 G-9

IMB 36-800 kV Outdoor Current Transformers

Design and Shipping Data

A
D

B
C
J

30

K K
K

IMB 800 F G

G-10 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Current Transformers IMB 36-800 kV

Design and Shipping Data

Changes, special design of dimensions
A, B, C A A A
Tank-type Increased Cooling flange Cooler Three primary
tank height ratios
mm mm mm mm
Standard tank 210 - 255 0
Hexagon tank 210 or 420 210 35 / 240 *) -
Octagon tank 150 - 440 -
HV tank 200 or 400 - 400 **) -
*) 35 mm for IMB 245, 240 mm for IMB 300 - 420
**) 400 mm for IMB 420 - 550, IMB 800 is always equipped with cooler

Shipping Data for Standard IMB

Type Net weight Oil Shipping Shipping Shipping
Incl. oil weight dimensions volume
1-pack/3-pack 1-pack/3-pack 1-pack/3-pack
kg kg kg LxWxH m m3
IMB 36 1
420 45 550 / 1630 2.26x0.6x0.94 / 1.67x0.8x2.21 1.3 / 3
IMB 721 420 45 550 / 1630 2.26x0.6x0.94 / 1.67x0.8x2.21 1.3 / 3
IMB 123 1
490 50 650 / 1850 2.75x0.6x0.94 / 1.67x0.8x2.7 1.5 / 3.6
IMB 145 1
490 50 650 / 1850 2.75x0.6x0.94 / 1.67x0.8x2.7 1.5 / 3.6
IMB 1701 550 55 700 / - 2.96x0.6x0.94 / - 1.7 / -
IMB 245 2
1100 110 1390 / - 3.82x1.06x1.02 / - 4.2 / -
IMB 3002 1400 170 1815 / - 4.76x1.08x1.10 / - 5.7 / -
IMB 362 2
1500 180 1915 / - 4.76x1.08x1.10 / - 5.7 / -
IMB 4202 1600 190 2050 / - 5.21x1.08x1.10 / - 6.2 / -
IMB 420 3
2500 300 3120 / - 5.82x1.23x1.22 / - 8.8 / -
IMB 4204 2600 290 3220 / - 5.74x1.06x1.47 / - 9.0 / -
IMB 550 3
2800 330 3480 / - 6.42x1.23x1.22 / - 9.7 / -
IMB 5504 3500 510 4180 / - 6.34x1.06x1.47 / - 9.9 / -
IMB 800 4
4200 670 6400 / - 8.71x1.06x1.47 / - 13.5 / -

1) Standard tank
2) Hexagonal tank
3) Octagon tank
4) HV tank

IMB 36 - 145 is normally packed for vertical transport in a 3-pack.

Vertical transport in a 1-pack can be quoted on request.
IMB 170 - 800 is always packed for horizontal transport in 1-pack.

Additional weights
Weight indicated in table above is for standard IMB.
Additional weights may occur depending on requirements and configuration.

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IMB 36-800 kV Outdoor Current Transformers

Reconnection
General
The current transformer can be reconnected to adapt for varying currents. The IMB type can
be delivered in a configuration that permits reconnecttion either on primary or
secondary side, or a combination of the two.
The advantage of primary reconnection is that the ampere-turns remains the same and
thereby the output (VA). The disadvantage is that the short-circuit capability will be reduced
for the lower ratio(s).

Primary Reconnection

Two primary ratios for two turns Two primary ratios, connected for one turn

C1
C2 C1
C2

Connection above is for the lower current Connection above is for the higher current

Secondary Reconnection

P1 P2

S1 S2 S3 S4 S5
The unused taps on the reconnectable secondary winding must be left open.

If windings/cores are not used in a current transformer they must be short-circuited

between the highest ratio taps (e.g. S1 - S5) and shall be grounded.

Caution!
Never leave an unused secondary winding open.
Very high-induced voltages are generated across the terminals
and both the user and the transformer are subjected to danger.

G-12 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Voltage Transformers EMF 52-170 kV

Inductive Voltage Transformer EMF

For revenue metering and protection The unique quartz filling minimizes the
in high voltage networks, the oil-paper quantity of oil and allows a simple and reli-
insulated voltage transformer EMF is the able expansion system.
most sold inductive voltage transformer • Low flux in the core at operating voltage
in the world. gives a wide safety margin against
• Designed for widely shifting conditions, saturation and ferro-resonance.
from polar to desert climates.

Brief Performance Data

Installation Outdoor

Design Inductive type

Insulation Oil-paper-quartz
Highest voltage for 52-170 kV
equipment
Voltage factor (Vf) Up to 1.9/8 hrs
Insulators Porcelain
On request silicon
rubber (SIR)
Creepage distance ≥ 25 mm/kV
(Longer on request)
Service conditions
Ambient temperature -40 °C to +40 °C
(others on request)

Design altitude Maximum 1000 m

(others on request)

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 H-1

EMF 52-170 kV Outdoor Voltage Transformers

Inductive Voltage Transformer EMF

Material Normally it is only necessary to check that
EMF 52-170: All external metal surfaces are the oil level is correct, and that no oil leakage
made of an aluminum alloy, resistant to most has occurred. The transformers are hermeti-
known environment factors. Bolts, nuts, etc. cally sealed and therefore require no other
are made of acid-proof steel. The aluminum inspection.
surfaces do not normally need painting. We A comprehensive inspection is recommen-
can, however, offer a protective paint or ded after 30 years. This provides increased
anodized. safety and continued problem-free operation.
The inspection methods and scope very sig-
Creepage Distance nificantly depending on the local conditions.
EMF is available as standard with normal or As the primary winding is not capacitive
long creepage distances according to the graded, the measurement of tan-delta gives
table on page J-4. Longer creepage distanc- no significant result. Therefore oil sampling
es can be quoted on request. for dissolved gas analysis is recommended
for checking the insulation.
Mechanical Stability
The mechanical stability gives a sufficient Maintenance instructions are supplied with
safety margin for normal wind loads and each delivery.
stress from conductors. EMF can also with-
stand high seismic forces. ABB, High Voltage Products is at your dis-
posal for discussions and advice.
Rating Plates
Rating plates of stainless steel, with engra- Impregnation Agent
ved text and wiring diagrams are mounted Oil of type Nynäs Nytro 10 XN
on the transformer enclosure. (according to IEC 296 grade 2) is free of PCB
and other heavily toxic substances and has a
Arrival Inspection - Assembly low impact on the environment.
Please check the packaging and contents
with regard to transport damage on arrival. In Disposal
the event of damage to the goods, contact After separating the oil and quartz the oil can
ABB for advice, before further handling of the be burned in an appropriate installation. Oil
goods. Any damage should be documented residue in the quartz can be burnt, where
(photographed). after the quartz can be deposited.
The transformer must be assembled on a The disposal should be carried out in accor-
flat surface. An uneven surface can cause dance with local legal provisions.
misalignment of the transformer, with the risk The porcelain can, after it has been
of oil leakage. crushed, be used as landfill.
The metals used in the transformer can be
Assembly instructions are provided with each recycled. To recycle the copper in the wind-
delivery. ings, the oil-soaked paper insulation should
be burnt.
Maintenance
Maintenance requirements are insignificant
as EMF is designed for a service life of more
than 30 years.

H-2 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Voltage Transformers EMF 52-170 kV

Inductive Voltage Transformer EMF

Primary Terminals
EMF 52-170 is as standard equipped with an
aluminum bar terminal, suitable for IEC and
NEMA specifications.

The primary terminal is a voltage terminal and

should therefore, according to standards, with-
stand static force of 1,000 N for Um
(system voltage) 123 – 170 kV and 500 N for
lower voltages. Withstand dynamic force is
1,400 and 700 N respectively.

EMF 52-170

Secondary Terminal Box and

Secondary Terminals
The terminal box for the secondary winding ter-
minal is mounted on the transformer enclosure.
As standard the terminal box is manufactured of
corrosion resistant, cast aluminum.
This box is equipped with a detachable,
undrilled gland plate, which on installation can
be drilled for cable bushings. It can, on request,
be quoted with cable glands according to the EMF 52-84
customer’s specification.
The terminal box is provided with a drain.

EMF 52-170: Secondary terminals accept

wires with cross-sections up to 10 mm2.

Protection class for the terminal box is IP 55.

EMF 123-170

Ground (Earth) Connections

The transformer is normally equipped with a
ground terminal with a clamp of nickel-plated
brass. For conductors Ø=5-16 mm
(area 20-200 mm2), see the figure.
It can also be quoted on request with a connec-
tion for a ground bar.

Grounding of the secondary circuits is made

inside the terminal box.

EMF 52-84 EMF 123-170

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EMF 52-170 kV Outdoor Voltage Transformers

Design Data
Nominal Flash-Over and Creepage Distance
Normal porcelain Porcelain with long creepage distance
(min. nom. values) (min. nom. values)
Type Flash-over Creepage Protected Flash-over Creepage Protected
distance distance creepage distance distance creepage
distance distance
mm mm mm mm mm mm
EMF 52 630 2248 1020 - - -

EMF 72 630 2248 1020 - - -

EMF 84 630 2248 1020 - - -

EMF 123 1200 3625 1400 - - -

EMF 145 1200 3625 1400 1330 5270 2200

EMF 170 1330 5270 2200 - - -

Test Voltages IEC 60044-2, (SS-EN 60044-2)

Type Highest voltage 1min LIWL RIV test RIV level
for equipment wet/dry 1.2/50 µs voltage
(Um)

kV kV kV kV Max. µV
EMF 52 52 95 250 30 125
EMF 72 72.5 140 325 46 125
EMF 84 84 150 380 54 125
EMF 123 123 230 550 78 2500
EMF 145 145 275 650 92 2500
EMF 170 170 325 750 108 2500

Test voltages above are valid for altitudes <1000 meters above sea level.

Test Voltages IEEE C 57.13 (CAN 3 – C 131 – M83)

Type Highest voltage AC test AC test BIL
for equipment dry, 1 min wet, 10 sec 1.2/50 µs
(Um)

kV kV kV kV Max.
EMF 52 52 95 95 250
EMF 72 72.5 140 175 350
EMF 123 121 (123) 230 230 550
EMF 145 145 275 275 650
EMF 170 169 (170) 325 315 (325) 750

Values within brackets refer to CAN 3-C13.1-M79. Test voltages above are valid for altitudes < 1000 meters above sea level.

H-4 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Voltage Transformers EMF 52-170 kV

Design Data According to IEC

Secondary Voltages and Burdens
Standards International IEC 60044-2, (IEC 186)
Swedish Standard SS-EN 60044-2
Rated data at 50 or 60 Hz, The transformer normally has one or two windings for
Voltage factor 1.5 or 1.9 continuous load and one residual voltage winding. Other
configurations can be quoted according to requirements.

Standard Accuracy Classes and Burdens

According to IEC
50 VA class 0.2 100 VA class 3P
100 VA class 0.5 100 VA class 3P
150 VA class 1.0 100 VA class 3P
For lower or higher burdens please contact us.
The standards state as standard values for rated voltage factor 1.5/30 sec. for effectively earthed systems, 1.9/30 sec. for systems
without effective earthing with automatic earth fault tripping and 1.9/8 hrs for systems with insulated neutral point without automatic
earth fault tripping.

Since the residual voltage winding is not loaded except during a fault, the effect of its load
on the accuracy of the other windings is disregarded in accordance with IEC.

Please note that modern meters and protection require much lower burdens
than those above, and to achive best accuracy you should avoid specifying
burdens higher than necessary; see page B-3.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 H-5

EMF 52-170 Outdoor Voltage Transformers

Design Data According to IEEE and CAN3

Secondary Voltages and Burdens

Standards American IEEE C57.13-1993
Canadian CAN3-C13-M83
Rated data at 60 Hz, The transformer normally has one or two secondary
Voltage factor 1.4 windings for continuous load (Y-connected).

Standard Accuracy Classes and Burdens

According to IEEE and CAN3
0.3 WXY 0.6 WXYZ 1.2/3P WXYZ
For lower or higher burdens please contact us.

Rated burdens
W = 12.5 VA power factor 0.1
X = 25 VA power factor 0.7
Y = 75 VA power factor 0.85
YY = 150 VA power factor 0.85
Z = 200 VA power factor 0.85
ZZ = 400 VA power factor 0.85

Example of turn ratio:

350-600:1 means one secondary winding with the ratio 350:1 and one tertiary winding ratio 600:1
350/600:1:1 means one secondary winding and one tertiary winding both with taps for ratios 350:1
and 600:1
Protective classes according to CAN (1P, 2P, 3P) can be quoted on request.
Voltage factor 1.9 according to CAN can be quoted on request.

H-6 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Voltage Transformers EMF 52-170 kV

Design Data - Dimensions

Voltage Transformers EMF
A B C D E F

Type Total Flash-over Height to Fixing hole Ground level Expansion

height distance terminal box dimensions height vessel diameter

mm mm mm mm mm mm
EMF 52 1464 630 114 335 x 335 540 324
EMF 72 1464 630 114 335 x 335 540 324
EMF 84 1464 630 114 335 x 335 540 324
EMF 123 2360 1200 65 410 x 410 760 416
EMF 145 2360 1200 65 410 x 410 760 416
EMF 170 2490 1330 65 410 x 410 760 416

135
B

A
E
C

20 mm
D D

EMF 52-84 EMF 123-170

Note: Primary terminal will Note: Primary terminal will
be mounted at site be mounted at site

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 H-7

EMF 52-170 Outdoor Voltage Transformers

Design Data - Shipping Data

Voltage Transformers EMF
Type Net weight Oil Shipping weight Shipping dimensions Shipping volume
incl. oil 3-pack 3-pack 3-pack
Porcelain insulator LxWxH

kg kg kg m m3
EMF 52 300 40 1040 1.6 x 0.9 x 1.7 2.5
EMF 72 300 40 1040 1.6 x 0.9 x 1.7 2.5
EMF 84 300 40 1040 1.6 x 0.9 x 1.7 2.5
EMF 123 570 80 1975 2 x 1 x 2.6 5.2
EMF 145 570 80 1975 2 x 1 x 2.6 5.2
EMF 170 610 83 2130 2 x 1 x 2.7 5.4

EMF 52 - 84 must not be tilted more than 60° during transport and storage.
Signs are placed on the transformer’s rating plate.

EMF 123 - 170 is normally packed for vertical transport (3-pack).

However, it can be transported in a horizontal position and is available on request for horizontal
transport (1-pack).

H-8 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV
Capacitor Voltage Transformer CPA and CPB (IEC)
For revenue metering and protection in The CPA and CPB have a high Quality
high voltage networks. The overall design Factor, as a result of their comparatively
of the CVT and the mixed dielectric in the high capacitance, combined with a high
capacitor elements have proven to be intermediate voltage.
insensitive to temperature changes, and The Quality Factor = Cequivalent x U²intermediate
the accuracy is equivalent to inductive is a measure of the accuracy stability. The
voltage transformers. These CVTs are higher this factor, the better the accuracy,
designed for widely shifting conditions, and the better the transient response.
from polar to desert climates.

Brief Performance Data

Installation Outdoor
Design Capacitor type
Meets IEC standards
Insulation
CVD Aluminum-foil/paper/ poly-
propylene film, synthetic oil

EMU Paper - mineral oil

Highest voltage for 72-765 kV
equipment
Voltage factor (Vf) Up to 1.9/8 hrs
Insulators Porcelain - on request silicon
rubber (SIR)
Creepage distance ≥ 25 mm/kV
(longer on request)
Service conditions
Ambient temperature -40 °C to +40 °C
(others on request)

Design altitude Maximum 1000 m

(others on request)

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 I-1

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Capacitor Voltage Transformer CPA and CPB (IEC)

Material The CPA and CPB use a damping circuit,
All external metal surfaces are made of an connected in parallel with one of the second-
aluminum alloy, resistant to most known en- ary windings (see diagram on page I-11). The
vironment factors. Bolts, nuts, etc. are made damping circuit consists of a reactor with an
of acid-proof steel. The aluminum surfaces iron core, and an oil-cooled resistor in series.
do not normally need painting. We can, how- Under normal use, the iron core of the damp-
ever, offer a protective paint, normally light ing reactor is not saturated, yielding high
gray. impedance, so that practically no current is
flowing through this circuit.
Creepage Distance The damping circuit has two bridged termi-
As standard, CPA and CPB are offered with nals; d1- d2, behind a sealed covering hood
creepage distance 25 mm/kV. Longer creep- in the terminal box. In particular cases and
age distances can be offered on request. after agreement this bridge can be opened,
to check that the circuit is intact, by resis-
Silicone Rubber Insulators tance measurement.
The complete CVT and CC range is available
with silicone rubber (SIR) insulators. Our SIR Ratio Adjustment
insulators are produced with a patented heli- The transformer of the electromagnetic unit
cal extrusion molding technique, which gives has five adjustment windings on the earth
completely joint-free insulators with outstand- side of the primary winding. The numbers of
ing performance. All CVTs and CCs with this turns of these windings have been chosen
type of insulators have the same high creep- so that the ratio can be adjusted ±6.05% in
age distance, 25 mm/kV, as porcelain. steps of 0.05%. These windings are external-
ly accessible behind a sealed covering hood
Mechanical Stability in the secondary terminal box. The CVT is
The mechanical stability gives sufficient a delivered adjusted for a specified burden and
safety margin for normal wind loads and con- class, and normally no further adjustment is
ductor forces. In most cases, with help of the necessary.
optional top plate, it is also possible to mount If needed, the adjustment windings enable
line traps for power line carrier equipment exchange of the voltage divider on site, and
directly on top of the capacitor divider. The readjust the transformer for the new combi-
CPA and CPB will also withstand most cases nation of voltage divider/electromagnetic unit.
of seismic stress.
Rating Plates
Ferroresonance Damping Circuit Corrosion resistant rating plates with text and
All CVTs need to incorporate some kind of wiring diagrams are used. General data can
ferro-resonance damping, since the capaci- be found on the door of the terminal box,
tance in the voltage divider, in series with the connection diagrams and secondary winding
inductance of the transformer and the series data on the inside.
reactor, constitutes a tuned resonance cir- The capacitors are marked with measured
cuit. capacitance on the insulator(s) base flange.
This circuit can be brought into reso-
nance, that may saturate the iron core of the Power Line Carrier (PLC)
transformer by various disturbances in the As an option all CVTs can be equipped with
network. This phenomenon can also over- Carrier Accessories. Modern PLC equip-
heat the electro-magnetic unit, or lead to ments are adapted for a wide range of cou-
insulation breakdown. pling capacitors. None specific capacitance
is required. Only minimum capacitance must
be specified due to choice of frequency.

I-2 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Capacitor Voltage Transformer CPA and CPB (IEC)

Primary Terminal
CPA and CPB are normally delivered with a flat 4-hole
aluminum pad, suitable for bolts C-C from 40 to
50 mm and for connecting normal aluminum cable
clamps. Other primary terminals can be offered on
request, such as a round aluminum studs, Ø=30 mm.
Maximum static force on the primary terminal is
1,500 N in all directions. Maximum dynamic force is
2,100 N
(Static/dynamic 1,300/1,800 N for CPB 800)

Secondary Terminal Box and

Secondary Terminals
The transformer is equipped with a
secondary terminal box, protection L

class IP 55. This box is equipped with

a detachable, undrilled gland plate,
which on installation can be drilled for
cable bushings. The box is provided
with a drain.
The transformer can also be equipped
with a larger terminal box, with space
for fuses or micro circuit breakers and A

/ or protection for power line carrier

equipment.
The secondary terminals normally consist of Phoenix
standard terminal blocks for wire cross-section 10
Standard Terminal Box
Without Carrier Accessories and Fuses
mm². In the terminal box are also terminals (d1-d2) for
damping circuit, terminals for the adjustment windings
(B1 to B10) and the capacitor low voltage terminal ”L”
(for power line carrier equipment). Terminals d1 - d2
and B1 - B10 are intended for factory settings and
thus located behind a sealed covering hood to pre-
vent inadvertent reconnection.

The ”L” terminal must always be grounded

if no carrier equipment is connected.

Ground Terminals
The transformer is normally equipped with an ground
clamp with a cap of nickel-plated brass, for conduc-
tors 8-16 mm (area 50-200 mm2), which can be
moved to either mounting foot.
A stainless steel bar, 80 x 145 x 8 mm, can be quoted
on request. The bar can be supplied undrilled or
drilled according to IEC or NEMA standards. Ground-
ing terminals for the secondary circuits are placed
inside the terminal box.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 I-3

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Installation and Maintenance (IEC)

Unpacking • Control measurements of the EMU
Please check the crates and their contents A simple test is to measure the insulation
for damage during transportation upon re- resistance in mega-ohms (max. test voltage
ceipt. Should there be any damage, please 1,000 VDC) of the secondary windings.
contact ABB for advice before the goods Since the high voltage winding of the trans-
are handled further. Any damage should be former is not capacitively graded, a measure-
documented (photographed). ment of the loss angle (tan delta) will give no
significant result.
Assembly What is possible, however, is to take an oil
The electromagnetic unit and the capacitor sample, for gas chromatography analysis
voltage divider are delivered as one unit for from the electromagnetic unit to assess its
CVTs with system voltages up to 245 kV. condition.
CVTs with higher system voltages, having The tank of the electromagnetic unit can,
more than one CVD part, are delivered with on request, be equipped with a sampling
the bottom unit of the CVD assembled onto valve, and we can deliver suitable sampling
the EMU. equipment. A simpler method is to take the
The EMU, with the bottom CVD unit should oil sample from the oil-filling hole. Sampling
be installed first, before the top part(s) of the intervals will vary, depending on service con-
CVD is (are) mounted in place. Lifting instruc- ditions; generally, no oil analysis should be
tions are included in each package. necessary during the first 20 years of service.
Check that the top and the bottom insulator
have the same serial number (for CVDs with Environmental Aspects
more than one capacitor unit). Impregnant
Both Faradol 810 (the synthetic oil in the
Maintenance voltage dividers), and Nynäs NYTRO 10 XN
The CPA and CPB are designed for a service (the standard transformer oil in the electro-
life of more than 30 years, and are practically magnetic unit) are free from PCB and other
maintenance-free. We recommend however strongly harmful substances, and pose a low
the following controls and measures. impact to the environment.

• Visual check Destruction

We recommend a periodic inspection, to After draining the oils, they can be burnt in
check for oil leakages and also to inspect the an appropriate plant. In this respect, Faradol
insulator for collection of dirt. has similar combustion properties as normal
mineral oil.
• Control measurements of the CVD The disposal should be carried out in accor-
Since the voltage dividers are permanently dance with local legal provisions, laws and
sealed under slight over pressure it is not regulations.
possible to take oil samples from them. The porcelain can be deposited after it has
Under normal service conditions, no notice- been crushed.
able ageing will occur within the capacitors The metals in the electromagnetic unit and
(verified by ageing tests). However discrepan- the housings of the voltage divider can be
cies between the secondary voltages in par- recycled. Aluminum parts are labeled with
allel phases can be an indication of a fault in material specifications. In order to recycle
a capacitor part of one of the voltage trans- the copper in the windings, the oil-saturated
formers, which is why such a comparison paper insulation should be burnt.
is recommended. In such a case a further The aluminum in the capacitor elements,
measurement of the capacitance value is rec- with their combination of foil, paper and
ommended. Readings can be taken between polypropylene film, can be recycled after the
the top and the ”L” terminal in the secondary insulation has been burnt; the plastic film will
terminal box. not emit any harmful substances during this
process.

I-4 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Design Data According to IEC

Number of capacitor units, capacitance, flash-over and creepage distance
(CSA, standard capacitance) (also valid for CCA)
Normal porcelain (min. nom. values)
Porcelain with extra
Type Number of Standard Flashover Creepage Protected creepage long creepage
capacitor units capacitance distance distance distance distance
(min. nom. values)
pF (+10; -5%) mm mm mm
CPA/CPB 72 1 23500 700 2200 890
CPA/CPB 123 1 14500 980 3160 1282
CPA/CPB 145 1 12600 1190 3880 1545
CPA/CPB 170 1 10500 1400 4600 1835 Offered on request.
Normally porcelain
CPA/CPB 245 1 7500 1960 6510 2610
as for the nearest
CPA/CPB 300 2 6300 2380 7760 3090 higher voltage
CPA/CPB 362 2 5200 2800 9200 3670
CPA/CPB 420 2 4700 3220 10630 4250
CPA/CPB 550 2 3500 4200 13980 5610

Number of capacitor units, capacitance, flash-over and creepage distance

(CSB, extra high capacitance) (also valid for CCB)
Normal porcelain (min. nom. values)
Porcelain with extra
Type Number of Extra high Flashover Creepage Protected creepage long creepage
capacitor units capacitance distance distance distance distance
(min. nom. values)
pF (+10; -5%) mm mm mm
CPA/CPB 145 1 18900 1400 4600 1835
CPA/CPB 170 1 15700 1400 4600 1835
CPA/CPB 245 1 11300 2100 6990 2805
Offered on request.
CPA/CPB 300 2 9400 2800 9200 3670 Normally porcelain
CPA/CPB 362 2 7900 2800 9200 3670 as for the nearest
higher voltage
CPA/CPB 420 2 7100 3220 10630 4250
CPA/CPB 550 2 5200 4200 13980 5610
-----/CPB 800 3 3500 6300 20970 8415

Test Voltages: IEC 60044-5

Type Highest voltage 1min LIWL Switching PD Test Max. PD RIV test RIV level
for equipment wet/dry 1.2/50 µs impulse voltage level voltage
(Um) 250/2500 µs
kV kV kV kV kV pC *) kV Max. µV
CPA/CPB 72 72.5 140/140 325 - 1.2 x Um 10 - -
CPA/CPB 123 123 230/230 550 - 1.2 x Um 10 78 2500
CPA/CPB 145 145 275/275 650 - 1.2 x Um 10 92 2500
CPA/CPB 170 170 325/325 750 - 1.2 x Um 10 108 2500
CPA/CPB 245 245 460/460 1050 - 1.2 x Um 10 156 2500
CPA/CPB 300 300 -/460 1050 850 1.2 x Um 10 191 2500
CPA/CPB 362 362 -/510 1175 950 1.2 x Um 10 230 2500
CPA/CPB 420 420 -/630 1425 1050 Um 10 267 2500
CPA/CPB 550 525 -/680 1550 1175 Um 10 349 2500
-----/CPB 800 765 -/975 2100 1425 Um 10 508 2500
Test voltages above are valid for altitudes < 1000 meters above sea level. *) 5 pC at test voltage 1.2 x Um/√3

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 I-5

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Design Data According to IEC

Secondary Voltage and Burdens
Standards IEC 60044-5
Rated data at 50 or 60 Hz, Voltage factor 1.5 or 1.9
The transformer normally has one or two windings for continuous load, and one earth-fault
winding. Other configurations can be offered according to requirements.

Approximate Maximum Total Burdens in VA

Measuring winding
Highest class Voltage factor 1.5*) Voltage factor 1.9*)
CPA CPB CPA CPB
0.2 70 120 40 100
0.5 200 400 125 300
1.0/3P T1 400 400 200 400
Earth-fault winding, irrespective of the voltage factor
3P T1/6P T1 100 100 100 100

*) The IEC standards state as standard values for effectively earthed systems 1.5/30 sec. For systems without effective earthing with
automatic earth fault tripping rated voltage factor 1.9/30 sec., and 1.9/8 hrs for systems with insulated neutral point without automatic
earth fault tripping.

The above values may, depending on configuration, be extended by the use of an extra-high capacitance voltage
divider (CSB). Please consult us for details.

The above values are total maximum values for Since the residual voltage winding is not
the secondary winding(s), voltage 100/√3 or loaded except during a fault, the effect of its
110/√3 V and one or no residual voltage wind- load on the accuracy of the other windings is
ing, class 3P, intended for connection in open disregarded in accordance with IEC.
delta, voltage 100 or 110 (100/3 or 110/3) V. Stated values should only be considered as
For other configurations please consult us. maximum values. Please note that modern
If the transformer has more than one contin- meters and protection require much lower
uously loaded winding, possibly with different burdens than those above, and to achieve
classes, the table above must be applied to best accuracy you should avoid specifying
the sum of these burdens and the most burdens higher than necessary: see page
accurate class. B-3.

I-6 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Dimensions
Capacitor Voltage Transformer CPA
A B C D E
Type Number of Total Flashover Height to Mounting hole Ground level
capacitor units height distance flange*) distance height
mm mm mm mm mm
CPA 72 1 1660 700 340 335 740
CPA 123 1 1940 980 340 335 740
CPA 145 1 2150**) 1190**) 340 335 740
CPA 170 1 2360 1400 340 335 740
CPA 245 1 2920**) 1960**) 340 335 740
CPA 300 2 3690**) 2380**) 340 335 740
CPA 362 2 4110 2800 340 335 740
CPA 420 2 4530 3220 340 335 740
CPA 550 2 5510 4200 340 335 740
* Valid for standard terminal box only. ** Valid for high capacitance only.

Capacitor Voltage Transformer CPB

A B C D E
Type Number of Total Flashover Height to Mounting hole Ground level
capacitor units height distance flange*) distance height
mm mm mm mm mm
CPB 72 1 1715 700 390 410 790
CPB 123 1 1995 980 390 410 790
CPB 145 1 2205**) 1190**) 390 410 790
CPB 170 1 2415 1400 390 410 790
CPB 245 1 2975**) 1960**) 390 410 790
CPB 300 2 3745**) 2380**) 390 410 790
CPB 362 2 4165 2800 390 410 790
CPB 420 2 4585 3220 390 410 790
CPB 550 2 5565 4200 390 410 790
CPB 800 3 8015 6300 390 410 790
*) Valid for standard terminal box only.
**) Valid for high capacitance only.

CPA/CPB

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 I-7

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Design Data and Dimensions

Coupling Capacitors
Coupling capacitors types CCA (standard capacitance) and CCB (extra high capacitance) are in-
tended for power line carrier applications. The insulator and capacitor design are identical to
capacitor voltage dividers type CSA and CSB, but without an intermediate voltage terminal.
Previous descriptions of the voltage divider are therefore applicable for the coupling capacitors.
Other capacitance values than those listed below are available on request.
A line trap can in most cases be mounted directly on top of the coupling capacitor. Primary
terminal according to ABB standard (see page I-3), as well as insulators for the pedestrial mounting
are part of the delivery. Test values are shown in page I-5 for the different designs.

Modern PLC equipment is adapted for a wide range of coupling capacitors. No specific capaci-
tance is required. Only minimum capacitance must be specified due to choice of frequency.

Type Number of Standard Extra high A Flashover and

capacitor units capacitance capacitance creepage dis-
pF (+10; -5%) pF (+10; -5%) Total height tances

CCA CCB mm
CCA 72 1 23500 - 1140
CCA 123 1 14500 - 1420
Please see
CCA/CCB 145 1 12600 18900 1630/1840
previous page,
CCA/CCB 170 1 10500 15700 1840/1840 table “Nominal
CCA/CCB 245 1 7500 11300 2400/2540 capacitance,
CCA/CCB 300 2 6300 9400 3170/3590 flashover- and
creepage
CCA/CCB 362 2 5200 7900 3590/3590 distance”
CCA/CCB 420 2 4700 7100 4010/4010
CCA/CCB 550 2 3500 5200 4990/4990

CCA/CCB

I-8 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Shipping Data CPA and CPB

Capacitor Voltage Transformers CPA
Type Net weight Oil Shipping weight Shipping dimensions Shipping volume,
incl. oil 3-pack 3-pack 3-pack/Total
kg* kg* kg* LxWxH m m3
CPA 72 320 73 1085 1.73x0.74x1.93 2.51)

CPA 123 350 74 1185 1.73x0.74x2.21 2.81)

CPA 145 370 76 1255 1.73x0.74x2.42 3.11)

CPA 170 390 78 1320 1.73x0.74x2.54 3.31)

CPA 245 450 82 3 x 635 3 x (3.11x0.69x0.91) 3 x 2.02)

CPA 300 520 97 1235 + 655 1.73x0.74x2.42 + 1.82x1.55x0.80 3.1 + 2.33)

CPA 362 565 100 1305 + 750 1.73x0.74x2.54 + 2.03x1.55x0.80 3.3 + 2.53)

CPA 420 610 105 1385 + 835 1.73x0.74x2.81 + 2.24x1.55x0.80 3.6 + 2.83)

CPA 550 710 111 3x650 + 1035 3 x (3.25x0.69x0.91) + 2.79x1.55x0.80 3 x 2.0 + 3.54)

Capacitor Voltage Transformers CPB

Type Net weight Oil Shipping weight Shipping dimensions Shipping volume,
incl. oil 3-pack 3-pack 3-pack/Total
kg* kg* kg* LxWxH m m3
CPB 72 425 95 1440 2.06x0.90x2.00 3.71)
CPB 123 455 96 1550 2.06x0.90x2.49 4.61)
CPB 145 475 98 1610 2.06x0.90x2.49 4,61)
CPB 170 495 100 1675 2.06x0.90x2.70 5.01)
CPB 245 555 104 3 x 755 3 x (3.21x0.80x1.01) 3 x 2.62)
CPB 300 625 119 1590 + 670 2.06x0.90x2.49 + 1.82x1.55x0.80 4.6 + 2.33)
CPB 362 670 122 1660 + 750 2.06x0.90x2.70 + 2.03x1.55x0.80 5.0 + 2.53)
CPB 420 715 127 1735 + 835 2.06x0.90x2.91 + 2.24x1.55x0.80 5.4 + 2.83)
CPB 550 815 133 3 x 770 + 1035 3 x (3.35x0.80x1.01) + 2.79x1.55x0.80 3 x 2.7 + 3.54)
CPB 800 1065 161 3x770 + 2x1025 3 x (3.35x0.80x1.01) + 2 x (2.79x1.55x0.80) 3 x 2.7 + 2 x 3.54)

1) Vertical 3-pack
2) Horizontal 1-pack (normally, due to transport height)
3) Bottom part vertical 3-pack; top part horizontal 3-pack
4) Bottom part horizontal 1-pack; top part horizontal 3-pack (normally, due to transport height)

*) The weights for extra high capacitance CVTs are 5 to 10% higher, but the shipping volumes are the same as for standard capaci-
tance CVTs.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 I-9

Outdoor Capacitor Voltage Transformers CPA and CPB 72-800 kV
and Coupling Capacitors CCA and CCB 72-550 kV

Shipping Data CCA and CCB

Coupling Capacitors CCA
Type Net Oil Shipping Shipping dimensions Shipping volume
weight weight 3-pack 3-pack/Total
incl. oil 3-pack

kg* kg* kg* LxWxH m m3

CCA 72 135 18 565 1.33x1.55x0.80 1.65)
CCA 123 165 19 675 1.61x1.55x0.80 2.05)
CCA 145 180 21 735 1.82x1.55x0.80 2.35)
CCA 170 205 23 825 2.03x1.55x0.80 2.55)
CCA 245 265 27 1060 2.59x1.55x0.80 3.25)
CCA 300 335 42 730 + 670 2x(1.82x1.55x0.80) 2.3 + 2.36)
CCA 362 380 45 810 + 750 2x(2.03x1.55x0.80) 2.5 + 2.56)
CCA 420 425 50 895 + 835 2x(2.24x1.55x0.80) 2.8 + 2.86)
CCA 550 525 56 1095 + 1035 2x(2.79x1.55x0.80) 3.5 + 3.56)

Coupling Capacitors CCB

Type Net Oil Shipping Shipping dimensions Shipping volume
weight weight 3-pack 3-pack/Total
incl. oil 3-pack

kg* kg* kg* LxWxH m m3

CCB 145 240 32 930 2.03x1.55x0.80 2.55)
CCB 170 240 29 930 2.03x1.55x0,80 2.55)
CCB 245 315 36 1220 2.79x1.55x0.80 3.55)
CCB 300 455 65 925 + 865 2x(2.03x1.55x0.80) 2.5 + 2.56)
CCB 362 455 58 925 + 865 2x(2.03x1.55x0.80) 2.5 + 2.56)
CCB 420 505 64 1015 + 955 2x(2.24x1.55x0.80) 2.8 + 2.86)
CCB 550 635 74 1260 + 1200 2x(2.79x1.55x0.80) 3.5 + 3.56)

5) Normally, coupling capacitors are packed in horizontal 3-pack

6) Top and bottom part(s) are packed in two cases, horizontal 3-pack

I-10 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

CPA and CPB 72-800 kV Outdoor Capacitor Voltage Transformers

Capacitor Voltage Transformer Type CPA and CPB (IEC)

Schematic Diagram of Capacitor Voltage Transformer

BN

Ground

1 Electromagnetic unit (EMU): Intermediate voltage transformer with compensating reactor

2 Primary winding of the intermediate voltage transformer
3 Compensating reactor
4 Adjustment windings
5 Secondary windings
6 Ferro-resonance damping circuit

Option – Carrier Accessories

Drain coil available for

12, 24 or 48 mH.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 I-11

 s
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I-12 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-550 kV

Capacitor Voltage Transformer CPA and CPB (ANSI)

For revenue metering and protection in The CPA and CPB have a high Quality
high voltage networks. The overall design Factor, as a result of their comparatively
of the CVT and the mixed dielectric in the high capacitance, combined with a high
capacitor elements have proven to be intermediate voltage.
insensitive to temperature changes, and The Quality Factor = Cequivalent x U²intermediate is
the accuracy is equivalent to inductive a measure of the accuracy stability. The
voltage transformers. These CVTs are higher this factor, the better the accuracy,
designed for widely shifting conditions, and the better the transient response.
from polar to desert climates.

Brief Performance Data

Installation Outdoor
Design Capacitor type
Meets ANSI standards
Insulation
CVD Aluminum-foil/paper/ poly-
propylene film, synthetic oil

EMU Paper - mineral oil

System voltage 69-500 (765) kV
Nominal
Insulators Porcelain - on request silicon
rubber (SIR)
Creepage distance ≥ 25 mm/kV
(longer on request)
Service conditions
Ambient temperature -40 °C to +40 °C
(others on request)

Design altitude Maximum 1000 m

(others on request)

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 J-1

CPA and CPB 72-550 kV Outdoor Capacitor Voltage Transformers

Capacitor Voltage Transformer CPA and CPB (ANSI)

Material The damping circuit consists of a reactor
All external metal surfaces are made of an with an iron core, and an oil-cooled resistor
aluminum alloy, resistant to most known en- in series. Under normal use, the iron core of
vironment factors. Bolts, nuts, etc. are made the damping reactor is not saturated, yielding
of acid-proof steel. The aluminum surfaces high impedance, so that practically no cur-
do not normally need painting. We can, how- rent is flows through this circuit.
ever, offer a protective paint, normally light The damping circuit has two bridged termi-
gray. nals; d1- d2, behind a sealed covering hood
in the terminal box. In particular cases and
Creepage Distance after agreement this bridge can be opened,
As standard, the CPA and CPB are offered to check that the circuit is intact, by resis-
with creepage distance 25 mm/kV. Longer tance measurement.
creepage distances can be offered on re-
quest. Ratio Adjustment
The transformer of the electromagnetic unit
Silicone Rubber Insulators has five adjustment windings on the ground
The complete ranges of the CVT and CC are side of the primary winding. The numbers of
available with silicone rubber (SIR) insula- turns of these windings have been chosen
tors. Our SIR insulators are produced with a so that the ratio can be adjusted ±6.05% in
patented helical extrusion molding technique, steps of 0.05%. These windings are exter-
which gives completely joint-free insulators nally accessible behind a sealed covering
with outstanding performance. All CVTs and hood in the secondary terminal box. The CVT
CCs with this type of insulators have the is delivered adjusted for a specified burden
same high creepage distance, 25 mm/kV, as and class, and normally no further adjust-
porcelain. ment is necessary. If needed, the adjustment
windings enable exchange of the voltage
Mechanical Stability divider on site, and readjust the transformer
The mechanical stability gives a sufficient for the new combination of voltage divider/
safety margin for normal wind loads and con- electromagnetic unit.
ductor forces. In most cases, with help of the
optional top plate, it is also possible to mount Rating Plates
line traps for power line carrier equipment Corrosion resistant rating plates with text and
directly on top of the capacitor divider. The wiring diagrams are used. General data can
CPA and CPB will also withstand most cases be found on the door of the terminal box,
of seismic stress. connection diagrams and secondary winding
data on the inside.
Ferroresonance Damping Circuit The capacitors are marked with measured
All CVTs need to incorporate some kind of capacitance on the lower insulator flange(s).
ferro-resonance damping, since the capaci-
tance in the voltage divider, in series with the Potential Grounding Switch
inductance of the transformer and the series A potential grounding switch can be included
reactor, constitutes a tuned resonance cir- in the EMU.
cuit.
This circuit can be brought into resonance, Power Line Carrier (PLC)
that may saturate the iron core of the trans- As an option all CVTs can be equipped with
former, by various disturbances in the net- Carrier Accessories. Modern PLC equip-
work. This phenomenon can also overheat ments are adapted for a wide range of cou-
the electromagnetic unit or lead to insulation pling capacitors. No specific capacitance is
breakdown. required. Only minimum capacitance must
The CPA and CPB use a damping circuit, be specified due to choice of frequency.
connected in parallel with one of the second-
ary windings (see scheme in page J-9).

J-2 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-550 kV

Capacitor Voltage Transformer CPA and CPB (ANSI)

Primary Terminal
The CPA and CPB are normally delivered with an
aluminum NEMA pad, suitable for connecting normal
aluminum cable clamps. Other primary terminals can
be offered on request, such as an aluminum round
stud, Ø=30 mm.
On request a top plate can be provided and drilled
with four bolt holes 5/8” UNC, on a 5” circle in case a
line trap is to be mounted.
Maximum static force on the primary terminal is 340
lbf (1,500 N) in all directions. Maximum dynamic force
is 475 lbf (2,100 N.)
(Maximum static/dynamic force is 295/412 lbf for
CPB 800)
Our design is corona free and corona rings are not
needed, but are available on request.

Secondary Terminal Box and

Secondary Terminals
The transformer is equipped with a secon-dary terminal box, protec-
tion class IP 55. This box is equipped with a
detachable,
undrilled gland plate, which on installation L

can be drilled for cable bushings. The box

is provided with a drain. The transformer
can also be equipped with a larger terminal
box, with space for fuses or micro circuit
breakers and/or protection for power line
carrier equipment.
The secondary terminals normally consist A

of Phoenix standard terminal blocks for

wire cross-section > 3/8” (10 mm²). In the
terminal box are also terminals (d1-d2) for damping circuit, terminals
for the adjustment windings (B1 - B10) and the capacitor low voltage
terminal ”L” (for power line carrier equipment). Terminals d1 - d2 and
B1 - B10 are intended for factory settings and thus located behind a
sealed covering hood to prevent inadvertent reconnection.

The ”L” terminal must always be grounded

if no carrier equipment is connected.

Ground Terminals
The transformer is normally equipped with a ground
clamp with a cap of nickel-plated brass, for conduc-
tor # 2 SOL to 500 MCM (diameters 8-16 mm), which
can be moved to either mounting foot. Grounding
terminals for the secondary circuits are placed inside
the terminal box. Example

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 J-3

CPA and CPB 72-550 kV Outdoor Capacitor Voltage Transformers

Installation and Maintenance (ANSI)

Unpacking • Control measurements of the EMU
Please check the crates and their contents A simple test is to measure the insulation
for damage during transportation upon re- resistance in mega-ohms (max. test voltage
ceipt. Should there be any damage, please 1,000 VDC) of the secondary windings.
contact ABB for advice before the goods Since the high voltage winding of the trans-
are handled further. Any damage should be former is not capacitively graded, a measure-
documented (photographed). ment of the loss angle (tan delta) will give no
significant result.
Assembly What is possible, however, is to take an oil
The electromagnetic unit and the capacitor sample, for gas chromatography analysis
voltage divider are delivered as one unit for from the electromagnetic unit to assess its
CVTs with system voltages up to 230 kV. condition.
CVTs with higher system voltages, having The tank of the electromagnetic unit can,
more than one CVD part, are delivered with on request, be equipped with a sampling
the bottom unit of the CVD assembled onto valve, and we can deliver suitable sampling
the EMU. equipment. A simpler method is to take the
The EMU, with the bottom CVD unit should oil sample from the oil-filling hole. Sampling
be installed first, before the top part(s) of the intervals will vary, depending on service con-
CVD is (are) mounted in place. Lifting instruc- ditions; generally, no oil analysis should be
tions are included in each package. necessary during the first 20 years of service.
Check that the top and the bottom insulator
have the same serial number (for CVDs with Environmental Aspects
more than one capacitor unit). Impregnant
Both Faradol 810 (the synthetic oil in the
Maintenance voltage dividers), and Nynäs NYTRO 10 XN
The CPA and CPB are designed for a service (the standard transformer oil in the electro-
life of more than 30 years, and are practically magnetic unit) are free from PCB and other
maintenance-free. We recommend however strongly harmful substances, and pose a low
the following checks and measures. impact to the environment.

• Visual Check Destruction

We recommend a period inspection, to After draining the oils, they can be burnt in
check for oil leakages and also to inspect the an appropriate plant. In this respect, Faradol
insulator for collection of dirt. has similar combustion properties as normal
mineral oil.
• Control measurements of the CVD The disposal should be carried out in accor-
Since the voltage dividers are permanently dance with local legal provisions, laws and
sealed under slight overpressure it is not regulations.
possible to take oil samples from them. The porcelain can be deposited after it has
Under normal service conditions, no notice- been crushed.
able ageing will occur within the capacitors The metals in the electromagnetic unit, and
(verified by ageing tests). However discrep- the housings of the voltage divider can be
ancies between the secondary voltages in recycled. Aluminum parts are labeled with
parallel phases can be an indication of a material specification. In order to recycle the
fault in a capacitor part of one of the voltage copper in the windings, the oil-saturated
transformers, which is why such a compari- paper insulation should be burnt.
son is recommended. In such a case a fur- The aluminum in the capacitor elements,
ther measurement of the capacitance value with their combination of foil, paper and
is recommended. Readings can be taken polypropylene film can be reclaimed after the
between the top and the ”L” terminal in the insulation has been burnt; the plastic film will
secondary terminal box. not emit any harmful substances during this
process.

J-4 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-550 kV

Design Data According to ANSI

Number of capacitor units, capacitance, flash-over and creepage distance
(CSA, standard capacitance) (also valid for CCA)
Normal porcelain (min. nom. values) Porcelain with long
Type Number of Standard Striking distance Leaking distance creepage distance
capacitor units capacitance (min.) (min. nom. values)
pF (+10; -5 %) mm (inches) mm (inches)
CPA/CPB 72 1 23500 700 (28) 2200 (86)

CPA/CPB 123 1 14500 980 (39) 3160 (124)

CPA/CPB 145 1 12600 1190 (47) 3880 (153)

CPA/CPB 170 1 10500 1400 (55) 4600 (182) Offered on request

CPA/CPB 245 1 7500 1960 (77) 6510 (256)

CPA/CPB 420 2 4700 3220 (127) 10630 (420)

CPA/CPB 550 2 3500 4200 (166) 13980 (551)

Number of capacitor units, capacitance, flash-over and creepage distance

(CSB, extra high capacitance) (also valid for CCB)
Normal porcelain (min. nom. values) Porcelain with long
Type Number of Extra high Striking distance Leaking distance creepage distance
capacitor units capacitance (min.) (min. nom. values)
pF (+10; -5 %) mm (inches) mm (inches)

CPA/CPB 145 1 18900 1400 (56) 4600 (182)

CPA/CPB 170 1 15700 1400 (56) 4600 (182)
CPA/CPB 245 1 11300 2100 (83) 6990 (276) Offered on request
CPA/CPB 420 2 7100 3220 (127) 10630 (420)
CPA/CPB 550 2 5200 4200 (166) 13980 (551)

Test Voltages: ANSI C93.1 - 1999

Type Nominal Max rated AC test AC test BIL RIV test RIV level
system voltage Dry, 1min Wet, 10 sec 1.2/50 µs voltage
voltage

kV L-L1) kV L-G kV kV kV kV µV

CPA/CPB 72 69 42 165 140 350 42 125

CPA/CPB 123 115 70 265 230 550 70 250
CPA/CPB 145 138 84 320 275 650 84 250
CPA/CPB 170 161 98 370 325 750 98 250
CPA/CPB 245 230 140 525 460 1050 140 250
CPA/CPB 420 345 209 785 680 1550 209 250
CPA/CPB 550 500 318 900 780 1800 318 500
Test voltages above are valid for altitudes < 3300 feet above sea level.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 J-5

CPA and CPB 72-550 kV Outdoor Capacitor Voltage Transformers

Design Data According to ANSI

(The data in the tables below are ABB standard values. Other data can be offered on request)
Accuracy
The CPA is offered for 0.6R or 1.2R relay accuracy class and CPB for 0.3 or 0.6 metering accuracy class. It can be
supplied with two tapped windings, X and Y, or with three tapped windings X, Y and Z.

CPA with Metering Relaying Winding Winding Aux. winding Thermal

standard Secondary volt Secondary volt X1-X2, X2-X3 X1-X2, X2-X3 Optional burden
capacitance 115V: Tap V 115V:115/√3V Y1-Y2, Y2-Y3 Y1-Y2, Y2-Y3 Z1-Z3, Z2-Z3
Ratio Ratio Class Burden1) Class Burden1
)
Class Burden1
)
VA
CPA 72 350/600:1:1 (346/600:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
CPA 123 600/1000:1:1 (577/1000:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
CPA 145 700/1200:1:1 (693/1200:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
CPA 170 800/1400:1:1 (808/1400:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
CPA 245 1200/2000:1:1 (1155/2000:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
CPA 420 1800/3000:1:1 (1732/3000:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
CPA 550 2500/4500:1:1 (2511/4350:1:1) 0.6R 0-200VA 1.2R 0-400VA 1.2R 0-75VA 600
1) The total simultaneous burden (X+Y+Z) is not to exceed values given for each main winding. All burdens are factory set.

CPB with Metering Relaying Winding Winding Aux. winding Thermal

extra high Secondary volt Secondary volt X1-X2, X2-X3 X1-X2, X2-X3 Optional burden
capacitance 115V: Tap V 115V:115/√3V Y1-Y2, Y2-Y3 Y1-Y2, Y2-Y3 Z1-Z3, Z2-Z3
) ) )
Ratio Ratio Class Burden1 Class Burden1 Class Burden1 VA
CPB 145 700/1200:1:1 - 0.3 0-200VA 0.6 0-200VA 1.2R 0-75VA 600
CPB 170 800/1400:1:1 - 0.3 0-200VA 0.6 0-200VA 1.2R 0-75VA 600
CPB 245 1200/2000:1:1 - 0.3 0-200VA 0.6 0-200VA 1.2R 0-75VA 600
CPB 420 1800/3000:1:1 - 0.3 0-200VA 0.6 0-200VA 1.2R 0-75VA 600
CPB 550 2500/4500:1:1 - 0.3 0-200VA 0.6 0-200VA 1.2R 0-75VA 600
1) The total simultaneous burden (X+Y+Z) is not to exceed values given for each main winding. All burdens are factory set.

CPA/CPB Metering performance Relaying performance

Ratio Perf. ref. Voltage 2) Ratio Perf. ref. Voltage 2)

CPA 72 350/600:1:1 40.25 kV L-G (346/600:1:1) 69/√3 kV
CPA 123 600/1000:1:1 69 kV L-G (577/1000:1:1) 115/√3 kV
CPA/CPB 145 700/1200:1:1 80.5 kV L-G (693/1200:1:1) 138/√3 kV
CPA/CPB 170 800/1400:1:1 92 kV L-G (808/1400:1:1) 161/√3 kV
CPA/CPB 245 1200/2000:1:1 138 kV L-G (1155/2000:1:1) 230/√3 kV
CPA/CPB 420 1800/3000:1:1 207kV L-G (1732/3000:1:1) 345/√3 kV
CPA/CPB 550 2500/4500:1:1 287.5 kV L-G (2510/4348:1:1) 500/√3 kV
2) Application of the “performance reference voltage” between phase and ground will result in 115 V secondary winding having lower ratio.

Rated burdens
W = 12.5 VA power factor 0.1, X = 25 VA power factor 0.7, Y = 75 VA power factor 0.85
YY = 150 VA power factor 0.85, Z = 200 VA power factor 0.85, ZZ = 400 VA power factor 0.85

Coupling Capacitors
Coupling capacitors types CCA (standard capacitance) and CCB (extra high capacitance) are intended for power
line carrier applications. The insulator and capacitor design are identical to capacitor voltage dividers type CSA and
CSB, but without an intermediate voltage terminal.
Descriptions of the voltage divider are in the IEC catalog for the CVT.

J-6 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-550 kV

Dimensions

Capacitor Voltage Transformer CPA

A B C D E
Type Number of Total Striking Height to Mounting Ground
capacitor units height distance flange *) hole distance level height
mm (in) mm (in) mm (in) mm (in) mm (in)
CPA 72 1 1660 (65”) 700 (28”) 340 (13”) 335 (13”) 740 (29”)
CPA 123 1 1940 (76”) 980 (39”) 340 (13”) 335 (13”) 740 (29”)
CPA 145 1 2150 (85”)**) 1190 (47”)**) 340 (13”) 335 (13”) 740 (29”)
CPA 170 1 2360 (93”) 1400 (55”) 340 (13”) 335 (13”) 740 (29”)
CPA 245 1 2920 (115”)**) 1960 (77”)**) 340 (13”) 335 (13”) 740 (29”)
CPA 420 2 4530 (178”) 3220 (127”) 340 (13”) 335 (13”) 740 (29”)
CPA 550 2 5510 (217”) 4200 (165”) 340 (13”) 335 (13”) 740 (29”)
* Valid for standard terminal box only. ** Valid for standard capacitance only.

Capacitor Voltage Transformer CPB

A B C D E
Type Number of Total Striking Height to Mounting Ground level
capacitor units height distance flange *) hole distance height
mm (in) mm (in) mm (in) mm (in) mm (in)
CPB 72 1 1715 (68”) 700 (28”) 390 (15”) 410 (17”) 790 (31”)
CPB 123 1 1995 (79”) 980 (39”) 390 (15”) 410 (17”) 790 (31”)
CPB 145 1 2205 (87”)**) 1190 (47”)**) 390 (15”) 410 (17”) 790 (31”)
CPB 170 1 2415 (95”) 1400 (55”) 390 (15”) 410 (17”) 790 (31”)
CPB 245 1 2975 (123”)**) 2100 (83”)**) 390 (15”) 410 (17”) 790 (31”)
CPB 420 2 4585 (181”) 3220 (127”) 390 (15”) 410 (17”) 790 (31”)
CPB 550 2 5565 (219”) 4200 (165”) 390 (15”) 410 (17”) 790 (31”)
* Valid for standard terminal box only.
** Valid for standard capacitance only.

CPA/CPB

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 J-7

CPA and CPB 72-550 kV Outdoor Capacitor Voltage Transformers

Shipping Data (ANSI)

Capacitor Voltage Transformers CPA
Type Net weight Oil *) Shipping weight * Shipping dimensions Shipping
incl. oil *) 3-pack) 3-pack volume
3-pack
LxWxH Total
kg kg kg m m3
CPA 72 320 73 1085 1.73x0.74x1.93 2.51)
CPA 123 350 74 1185 1.73x0.74x2.21 2.81)
CPA 145 370 76 1255 1.73x0.74x2.42 3.11)
CPA 170 390 78 1320 1.73x0.74x2.54 3.31)
CPA 245 450 82 3 x 635 3 x (3.11x0.69x0.91) 3 x 2.02)
CPA 420 715 127 1735 + 835 2.06x0.90x2.91 + 2.24x1.55x0.80 5.4 + 2.83)
CPA 550 815 133 3 x 770 + 1035 3 x (3.35x0.80x1.01) + 2.79x1.55x0.80 3 x 2.7 + 3.54)

Capacitor Voltage Transformers CPB

Type Net weight Oil *) Shipping weight Shipping dimensions Shipping
incl. oil *) *) 3-pack volume
3-pack 3-pack
LxWxH Total
kg kg kg m m3
CPB 72 425 95 1440 2.06x0.90x2.00 3.71)
CPB 123 455 96 1550 2.06x0.90x2.49 4.61)
CPB 145 475 98 1610 2.06x0.90x2.49 4.61)
CPB 170 495 100 1675 2.06x0.90x2.70 5.01)
CPB 245 555 104 3 x 755 3 x (3.21x0.80x1.01) 3 x 2.62)
CPB 420 715 127 1735 + 835 2.06x0.90x2.91 + 2.24x1.55x0.80 5.4 + 2.83)
CPB 550 815 133 3 x 770 + 1035 3 x (3.35x0.80x1.01) + 2.79x1.55x0.80 3 x 2.7 + 3.54)

*) The weights for extra high capacitance CVTs are 5 to 10% higher, but the shipping volumes are the same as for standard capacitance CVTs

1) Vertical 3-pack
2) Horizontal 1-pack (normally, due to transport height)
3) Bottom part vertical 3-pack; top part horizontal 3-pack
4) Bottom part horizontal 1-pack; top part horizontal 3-pack (normally, due to transport height)

J-8 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

Outdoor Capacitor Voltage Transformers CPA and CPB 72-550 kV

Capacitor Voltage Transformer CPA and CPB (ANSI)

Schematic Diagram of Capacitor Voltage Transformer
H1
1

BN
H2
Ground

1. Electromagnetic unit (EMU)

2. Primary winding of the intermediate voltage transformer
3. Potential grounding switch and choke coil (option)
4. Adjustment windings (B1-B10)
5. Secondary windings X and Y
6. Ferroresonance damping circuit
7. Auxiliary winding Z (option)

Option – Carrier Accessories

Drain coil available for

12, 24 or 48 mH.

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 J-9

Cable Entry Kits Roxtec CF 16

Optional - Accessories for cable installations

Easy installations for cables cables sizes and numbers in the junction
A Roxtec CF 16 cable entry kit combines reli- boxes (as shown below).
able sealing of cables in junction boxes with For other dimensions, please contact ABB,
easy installations. Each CF 16 can handle High Voltage Products, Ludvika, Sweden.
several cables through the same opening.
Simple maintenance
Multidiameter A Roxtec CF 16 can be opened and closed
The CF 16 uses adaptable Multidiameter repeatedly for easy installations and simple
technology. This enables cables of a wide maintenance. Another benefit is a built in
range of diameters to be sealed with a per- spare capacity for possible new cables in the
fect fit, even when tolerances and deviations future.
from nominal dimensions are considered.
The modules are delivered with a center core Benefit Summary
as a substitute for a cable. This means the • Seals several cables and diameters
entry kit is adaptable to different cable sizes, • Quick and easy installation
and to different numbers of penetrations. • Cable retention
• Rodent proof
Kit Supplied • IP 66/67
The Roxtec CF 16 kits are available in two • Halogen-free
versions: Each one with a customized set of • UL/NEMA 4, 4X, 12, 13
sealing modules to suit the most common • Fire retardant material UL 94-V0

ABB CF 16 junction box kit 1 ABB CF 16 junction box kit 2

Part No. Part No.

Roxtec CF 16 Kit 1: Handles maximum Roxtec CF 16 Kit 2: Handles maximum

one 9.5-32.5 mm cable, two 10-25 mm one 9.5-32.5 mm cable and four 10-25 mm
cables and six 3.5-16.5 mm cables. cables.

K-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 s
es r´
ot e
N omt
us
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ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 K-2

Quality Control and Testing

Quality Control and Testing

ABB AB, High Voltage Products is certified by Type Tests

The type tests reports for tests performed on
Lloyds to fulfill the requirements of ISO 9001.
transformers types similar to customer speci-
fications are available.
Bureau Veritas Quality International (BVQI) also
certifies us for Environmental Management Routine Tests
Systems, ISO 14001 and 14024. The following tests are performed on each
transformer as standard before delivery in
accordance with applicable standards:

Routine Tests for Current Routine Tests for Inductive

Transformers IMB Voltage Transformers EMF
IEC 60044-1 clause 6.2 IEC 60044-2
a Verfication of terminal marking and a Verfication of terminal marking and
polarity polarity
b Power-frequency withstand test on b Power-frequency withstand test on
primary winding primary winding
c Partial discharge measurement (applied test, 75 Hz for one minute)
d Power-frequency withstand test on c Partial discharge measurement
secondary windings d Power-frequency withstand test on
e Power-frequency withstand test secondary windings
between winding sections (applied test 4 kV, 50 Hz for one minute)
f Inter-turn overvoltage test on secondary e Determination of errors
windings
g Determination of errors ABB specific tests
(One transformer in each batch is type- a Sealing test
tested for accuracy. Remaining units at a b Measurement of no load current I0 at √3
reduced number of burdens. Complete x rated voltage
error curves on all transformers must be
ordered separately.) Other standards
The tests described above also fully satisfy
IEC 60044-1 clause 6.3 other standards, such as IEEE.
Measurement of capacitance and tan delta

ABB specific tests

a Sealing test
b Measurement of secondary resistance
(sample)
c Complete excitation curve for each
type of core in a transformer. For the
remaining transformers all cores are
checked at one or two points on the
excitation curve.

L-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 Quality Control and Testing

Test Capibilities in Ludvika STL provides a forum for international col-

Our high resource laboratories (high power/ laboration between testing organizations.
high voltage/environmental) in Ludvika are The membership and supervision of SATS
members of SATS (Scandinavian Associa- ensures the independency of the laboratory.
tion for Testing of Electric Power Equipment). We are able to claim that with these testing
SATS is a member of STL resources, we are at the forefront in devel-
(Short Circuit Testing Liaison). oping new and safe products for the 21st
century.

Routine Tests for Capacitor Routine Tests for Capacitor

Voltage Transformers CPA and CPB Voltage Transformers CPA and CPB
Electromagnetic Unit
IEC 60044-5, § 8.2 ANSI C93.1-1999, § 6.3
Electromagnetic unit: e, f, g, h, j * Leak test
Capacitor Voltage Divider/Coupling Ca- 2.2.1 Dielectric test of primary winding, four
pacitor: a, b, c, d, g times performance reference voltage
Capacitor Voltage Transformer: i, j (1 min.)
a Tightness of capacitor voltage divider * Partial discharge measurement
(10.1) 2.2.3 Dielectric test on secondary windings
b Capacitance and tan delta measurement and adjustment windings, 4 kV (1 min.)
at power-frequency (9.2) * Dielectric test of low voltage terminal,
c Power-frequency withstand test (10.2) 10 kV (1 min.)
d Measurement of partial discharge * Inspection and measurement of the
(10.2.3) damping circuit
e Verification of terminal markings (10.3) 6 Verification of terminal marking and
f Power-frequency withstand tests on the polarity.
electromagnetic unit (10.4) 5 Accuracy test
g Power-frequency withstand test on low
voltage terminal (10.2.4) Capacitor Voltage Divider/Coupling
h Power-frequency withstand tests on Capacitor
secondary windings (10.4.2) ANSI C93.1-1999, § 6.3
i Ferro-resonance check (10.5) * Leak test
j Accuracy check (determinations of 1.1 Measurement of capacitance and
errors) (10.6) dissipation factor for each capacitor
unit before dielectric test
ABB specific tests: 2.1 Dielectric test, voltage according to
Electromagnetic Unit table above
Tightness test * Partial discharge test of each capacitor
porcelain
Inspection of damping circuit. 1.2 Capacitance and dissipation factor
measurement after dielectric test
* Dielectric test of low voltage terminal
(1 min.)

*) ABB-Special quality check

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 L-2

Inquiry and Ordering Data

Ordering Data
Current Transformer IMB Voltage Transformer EMF

The following information is required with your The following information is required with your
order: order:

• Quantity • Quantity
• Standard/Customer specification • Standard/Customer specification
• Frequency • Frequency
• Highest voltage for equipment • Highest voltage for equipment
• Rated insulation level • Rated insulation level

Test Voltages Test Voltages

• Lightning impulse 1.2/50 µs • Lightning impulse 1.2/50 µs
• Power frequency dry/wet • Power frequency dry/wet
• Switching surge 250/2500 µs (For Um ≥ 300 kV, wet)
Voltages
Currents • Ratio (primary and secondary voltages)
• Ratio (primary and secondary currents) • Reconnection (secondary)
• Reconnection (primary or/and secondary) • Voltage factor (Vf) and time
• Rated continuous thermal current (Rf)
• Short time current, Ith 1 sec (3 sec) Burden and Accuracy
• Dynamic current, Idyn • Number of secondary winding(s)
• For each winding please state:
Burden and Accuracy Connection: Star or broken delta
• Number of cores Burden/class
• For each core please state:
Burden/class/overcurrent factor • Thermal limit burden (if requested)

Special Requirements Special Requirements

• Silicone rubber insulator (gray) • Silicone rubber insulator (gray)
• Creepage distance (ABB standard: 25 mm/kV) • Creepage distance (ABB standard: 25 mm/kV)
• Light gray porcelain (ABB standard: brown) • Light gray porcelain (ABB standard: brown)
• Special primary terminals • Special primary terminal
• Special secondary terminals • Special secondary terminals
• Heater • Secondary fuses
• Secondary overvoltage protection: • Heater
(spark gaps, protection gaps) • Anodized tank, terminal box and expansion system
• Anodized tank, terminal box and expansion system • 1-pack vertical transport (EMF 52-84)
(IMB 36-170) • 1-pack, horizontal transport (EMF 123-170)
• 1-pack, vertical transport (IMB 36-145) • Other requirements?
• Horizontal transport (IMB 36-145)
• Other? Additional Requirements
• Ambient temperature
Additional Requirements • Height above sea level if >1000 m
• Capacitive voltage tap Please state “normal” system and test voltages
• Adapter (for replacing old type IMB) according to actual standard when ≤1000 m a.s.l.
• Ambient temperature • Other requirements?
• Height above sea level if >1000 m
Please state “normal” system and test voltages
according to actual standard when ≤1000 m a.s.l.
• Other requirements?

M-1 Edition 5, 2008-03 ABB Instrument Transformers — Buyer’s Guide

 Inquiry and Ordering Data

Ordering Data
Capacitor Voltage Transformer Coupling Capacitor
CPA and CPB CCA and CCB
The following information is required with your The following information is required with your
order: order:

• Quantity • Quantity
• Standard/Customer specification • Standard/Customer specification
• Frequency • Frequency
• Highest voltage for equipment • Highest voltage for equipment
• Rated insulation level • Rated insulation level

Test Voltages Test Voltages

• Lightning impulse 1.2/50 µs • Lightning impulse 1.2/50 µs
• Power frequency dry/wet • Power frequency dry/wet
• Switching surge 250/2500 µs (For Um ≥ 300 kV, wet) • Switching surge 250/2500 µs (For Um ≥ 300 kV, wet)

Voltages Special Requirements

• Ratio (primary and secondary voltages) • Silicone rubber insulator (gray)
• Reconnection (secondary) • Creepage distance (ABB standard: 25 mm/kV)
• Voltage factor (Vf) and time • Light gray porcelain (ABB standard: brown)
• Special primary terminal
Burden and Accuracy
• Number of secondary winding (s) Additional Requirements
• For each winding please state: • Capacitance - high or extra high
Connection: Star or broken delta • Ambient temperature
Burden/class • Height above sea level if >1000 m
Please state “normal” system and test voltages
• Thermal limit burden (if requested) according to actual standard when ≤1000 m a.s.l.
• Other requirements?
Special Requirements
• Silicone rubber insulator (gray)
• Creepage distance (ABB standard: 25 mm/kV)
• Light gray porcelain (ABB standard: brown)
• Special primary terminal
• Special secondary terminals
• Secondary fuses
• Heater
• Protection for PLC equipment
• Horizontal transport
• Other requirements?

Additional Requirements
• Capacitance - high or extra high
• Ambient temperature
• Height above sea level if >1000 m
Please state “normal” system and test voltages
according to actual standard when ≤1000 m a.s.l.
• Other requirements?

ABB Instrument Transformers — Buyer’s Guide Edition 5, 2008-03 M-2

 © Copyright 2008 ABB. All rights reserved. Catalogue publication 1HSM9543 42-00en, Outdoor Instrument Transformers Buyer’s Guide, Edition 5, 2008-03

NOTE: ABB AB is working continuously to improve the products. We therefore

reserve the right to change designs, dimensions and data without prior notice.

ABB AB
High Voltage Products
SE-771 80 LUDVIKA, Sweden
Phone +46 240 78 20 00
Fax +46 240 78 36 50
E-mail: instr.transf@se.abb.com
Internet: http://www.abb.com