Circuit Breaker LTB D 72.
5 - 170 kV
FSA spring operating mechanisms
For single-pole operation
LTB D - proven design
LTB D circuit breakers with the ABB AutoPufferTM interrupter and spring operating
mechanisms have been reliably serving utilities
around the world since 1991. Over 20,000 units
have been delivered to over 120 countries with
an excellent record of performance.
The LTB D is designed for system voltages 72.5 170 kV
and rated for breaking current of 40 kA. LTB D is one
member of the extensive and proven ABB SF6 circuit
breaker family, which covers the voltage range from 72.5
up to 800 kV and for breaking capabilities up to 80 kA.
The LTB D for single pole operation has been optimized
using the well proven FSA 1 spring operating mechanism
in compliance with the major international standards
including IEC and ANSI.
Design
The three poles of the circuit breaker are mounted on a
pole beam, supported by a two column frame. Each pole
is equipped with its own spring operating mechanism
of trip-free design, containing both closing and tripping
springs. The operating mechanisms are mechanically
identical. Operational controls are centralized in the
centre mechanism and cabling between mechanisms
is factory installed and tested prior to delivery. Minimum
adjustment of the circuit breaker is required during site
assembly.
The circuit breaker poles are identical sealed, single
pressure, SF6 units, including breaking unit and hollow
post insulators and mechanism housings. The poles are
connected by factory installed SF6 gas piping connected
to a central manifold block for site filling and SF6 density
monitoring. ABBs well proven double nitrile rubber static
and dynamic seal designs ensure a maximum SF6 leak
rate of less than 0.5% per year.
Simply reliable, fully functional
ABBs more than 100 years experience in the delivery of
HV circuit breakers worldwide guarantees our customers
can easily specify what they require and be assured of
receiving their circuit breakers on time and to the high
quality expected and guaranteed by ABB. The LTB D
single-pole operated design can be specified by rated
voltage, insulator type, phase distance, control voltage
and pre-engineered flexible range of control functions.
Main features and advantages
Low energy, arc-assisted Auto-puffer interrupter
High dielectric strength and electrical endurance from
optimized contact system design (IEC class C2)
Proven nitrile rubber double sealing systems
Available with porcelain (brown or grey) or silicone
rubber composite insulators
Trip-free, cam disc, spring operating mechanisms
(IEC class M2)
Vibration proof, multi-stage operating latches with low
operating power
High seismic withstand capability (0.5 g) due to optimized support design
Mechanically connected circuit breaker position and
spring charge status indicators
Full functional module based controls design providing ease of specification and security of delivery and
performance
Factory installed and tested cabling. No site cabling
installation required between operating mechanisms
Modular component design, allowing rigorous, staged
and complete factory testing and minimum spare
parts inventory
Optimized packing and delivery arrangement to ensure transport safety and simple, rapid installation
Integrated Central Control Cubicle, CCC
Installation in less than one day
The functionally modular design, delivered fully tested from ABB allows the complete circuit breaker to be installed
and ready for use within one day. Minimum adjustment of the circuit breaker is required during installation on site
commissioning.
1. Delivery
Case 1: Welded support frame
Case 2: Circuit breaker poles
Case 3: Operating mechanisms, mounted on pole
beam with preterminated interphase cabling
2. Install support frames on foundation
(30 minutes)
3. Bolt pole beam to support frames
(30 minutes)
Foundation
Foundation
Note! Installation times are indicative only and subject to work by suitably trained personnel with appropriate tools. All
site works must be carried out in accordance with local laws, safety regulations and relevant ABB product information
manual delivered with the circuit breaker.
Installation in less than one day
4. Install poles on pole beam
(75 minutes)
5. Install substation cabling and HV
connections (180 minutes)
6. SF6 gas filling (45 minutes)
7. Site commissioning tests (60 minutes)
Electrical controls pre-engineered functional modules
for operational security
All interphase controls of the circuit breaker are completed in the ABB factory. No site cabling is required, ensuring
fast and error free installation. All main circuit functions have been developed into pre-engineered modules that
provide the user with simplicity of ordering and security of function. The standardized circuit and wiring design enables
a high degree of automated quality control in the production of the circuit breaker.
Cabling is terminated using positive clip lock, vibration proof plug connections. All internal cabling is indelibly marked
with unique cable numbers. Interphase cables have halogen free compound insulation, UV resistant sheaths and
overlapped copper tape screens. Separate gland plate provided for substation cable entry. Well spaced, vertically
mounted terminal blocks provided in central operating mechanism for connection of substation control and signalling
cables.
Circuits
Auxiliary
contacts
SF6 density
monitor
Two level:
Refill/
Blocking
Spring
limit
switch
Antipump
relay
Control
selector switch
Local / Remote
/ Disconnected
Local
operation
selection
Single-/
Three-pole
operation
Trip / Close
local switch
Close
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Trip 1
Standard
Standard
Standard
Standard
Standard
Trip 2
Standard
Standard
Standard
Standard
Standard
Motor
Device
description
Standard
7+7
- Rotary
wiping
action
- Double
break
1+1
1+1
Normally
closed
contacts.
Temperature
compensated.
MPa abs.
1+1
1+1
Rotary,
padlockable
Rotary
Standard
Optional
Optional
Rotary,
spring return
Option
Control voltage
110 - 125 VDC
220 - 250 VDC
Motor voltage
110 - 125 VDC
220 - 250 VDC
220 VAC
120 VAC
Heater and auxiliary voltage
Power
outlet
earth fault
MCB
(RCD)
Standard
Heater and
auxiliaries
70 W continuous
140 W thermostat
controlled
Signalling
MCB
220 VAC
120 VAC
Additional options
Undervoltage relay
Pole discrepancy
Spring charge failure monitoring
Door switch activated internal lamp
Preparation for trip circuit supervision
Technical data according to IEC
General
Circuit breaker type
LTB
Type of operation
1-pole operation
Number of poles
72.5 D1/B
145 D1/B
170 D1/B
Porcelain (brown-standard / grey - option)
mm/kV
25 or 31
Composite silicone rubber (option)
mm/kV
25
-30 to +40 (Lower or higher on request)
Operating temperature
Seismic withstand
0.2 - 0.5 g
Ratings and guaranteed performance in accordance with IEC 62271-100
Rated voltage
kV
72.5
145
170
to earth
kVpeak
325
650
750
across the open circuit-breaker
kVpeak
325
650
750
kV
140
275
325
kV
140
275
325
Rated insulation level
Lightning impulse withstand voltage
Power frequency withstand voltage
to earth, dry
across the open circuit-breaker, dry
Rated frequency
Hz
50/60
Rated normal current
3150
Rated short-circuit breaking current
kA
40
First-pole-to-clear factor
Rated short-circuit making current
1.5
kApeak
Rated operating sequence
Rated duration of short-circuit current (40 kA)
100
O-0.3 s-CO-3 min-CO
Opening time
ms
28-35
Break time
ms
50
Closing time
ms
70
Capacitive current switching
Class
C2
Mechanical endurance
Class
M2
Type
FSA1
Operating mechanism
Motor operated spring closing mechanism
Degree of protection
IP55
Power required at rated supply voltage by
Closing coil
500
Opening coil
500
Motor
740
70
Heating elements, continuously
Heating elements, connected by thermostat
140
Number of spare auxiliary contacts
Normally open
Number of spare auxiliary contacts
Normally closed
Mass of breaker module excl. operating mechanism
(porcelain / polymer insulators)
kg
3 x 300 / 3 x 130
Operating mechanism
kg
177 + 142 x 2
Masses and dimensions
Dimensions and shipping data LTB D
LTB D1/B Two-column stand,
Single-pole operation
Rated Voltage: 72.5 - 170 kV
Dimensions (mm)
Rated
Voltage
72.5 kV
145 kV
170 kV
4647
5197
5808
1164
1164
1475
670
1220
1520
3280
3830
4130
1750
1750
1750
4189
4189
4189
Rated
Voltage
72.5-170 kV
2501*
2946
*) Standard
**) Other dimensions can be provided
Available dimensions for phase distances
and heights to lowest part of insulator (mm)
Rated
Voltage
72.5 kV
145 kV
170 kV
1750*
1750*
1750*
2000
2000
2000
3529
Dimensions between stands. Centre to centre (mm)
Phase distance
1500
-
Height to lowest part of insulator **
2500
2500
2500
Phase distance
1500
1750
2000
Stand distance
1500
2000
2530
2500
2530
*) Standard
267
C
A
1. Central control cubicle
2. SF6 density monitor
707
580
2000
2501
2140
Legend:
574
1162
3. CB position indication
spring charge indication
4. Manual spring charge
handle access
756
Shipping data (three packages per circuit breaker)
Type
Circuit breaker poles
Support structure
Pole-beam with operating mechanism
Dimension
(m)
Gross weight (kg)
Porcelaine/Composite
Dimension
(m)
Gross weight
(kg)
Dimension
(m)
Gross weight
(kg)
LTB 72.5 D1/B
3.26 x 1.78 x 0.72
1130 / 710
2.17 x 0.90 x 0.53
370
4.41 x 1.11 x 2.25
1100
LTB 145 D1/B
3.26 x 1.78 x 0.72
1250 / 740
2.17 x 0.90 x 0.53
370
4.41 x 1.11 x 2.25
1100
LTB 170 D1/B
3.90 x 1.78 x 0.72
1500 / 840
2.17 x 0.90 x 0.53
370
4.41 x 1.11 x 2.25
1100
SE-771 80 LUDVIKA, SWEDEN
Tel: +46 (0)240 78 20 00
Fax: +46 (0)240 78 36 50
E-mail: circuit.breakers@se.abb.com
Internet: http://www.abb.com
NOTE! ABB AB is working continuously to improve the
products. We therefore reserve the right to change designs,
dimensions and data without prior notice.
Copyright 2007 ABB, All right reserved. Publication 1HSM 9543 22-10en, Circuit Breaker LTB D 72.5 - 170 kV with spring operating mechanism FSA, Edition 1, 2007-08. Print: www.henningsons.se
ABB AB
High Voltage Products
