Disconnectors and Earthing Switches
36 kV 800 kV
RUHRTAL Product Range
Disconnectors and Earthing Switches
from 36 kV to 800 kV
Rated Voltages Currents Centre Break Pantograph Knee-Type Vertical Break Double Side
Disconnectors Disconnectors Disconnectors Disconnectors Break
Disconnectors
In [A] - - - - £ 4000
36 kV Is [kA] - - - - £ 10 0
Ith(1s) [kA] - - - - £ 50
Ith(3s) [kA] - - - - £ 31.5
In [A] £ 3150 - - - £ 2500
72.5 kV Is [kA] £ 10 0 - - - £ 10 0
Ith(1s) [kA] £ 50 - - - £ 50
Ith(3s) [kA] £ 31.5 - - - £ 31.5
In [A] £ 4000 £ 3150 £ 3150 £ 2500 £ 2500
123 kV Is [kA] £ 160 £ 125 £ 125 £ 100 £ 10 0
Ith(1s) [kA] £ 10 0 £ 50 £ 50 £ 50 £ 50
Ith(3s) [kA] £ 63 £ 31.5 £ 31.5 £ 31.5 £ 31.5
In [A] £ 4000 £ 3150 - £ 3150 £ 2500
145 - 170 kV Is [kA] £ 160 £ 125 - £ 135 £ 10 0
Ith(1s) [kA] £ 10 0 £ 50 - £ 63 £ 50
Ith(3s) [kA] £ 63 £ 31.5 - £ 31.5 £ 31.5
In [A] £ 4000 £ 4000 - £ 4000 £ 3150
245 - 300 kV Is [kA] £ 160 £ 160 - £ 160 £ 125
Ith(1s) [kA] £ 10 0 £ 100 - £ 100 £ 10 0
Ith(3s) [kA] £ 63 £ 63 - £ 63 £ 63
In [A] £ 4000 £ 4000 - £ 4000 £ 4000
362 - 550 kV Is [kA] £ 20 0 £ 200 - £ 200 £ 160
Ith(1s) [kA] £ 10 0 £ 100 - £ 100 £ 10 0
Ith(3s) [kA] £ 63 £ 63 - £ 63 £ 63
In [A] - - - £ 4000 £ 4000
800 kV Is [kA] - - - £ 160 £ 20 0
Ith(1s) [kA] - - - £ 80 £ 10 0
Ith(3s) [kA] - - - £ 50 £ 63
Earthing switches for all voltage ranges, see page 8
Switch disconnectors for special purposes from
72.5 kV to 245 kV, see page 8
Operating mechanisms for all types of
disconnectors and earthing switches, see page 9
Commutating contacts for bus-transfer current
switching according to IEC 61128 are available for all
types of disconnectors.
Subsequent installation is possible, for RUHRTAL
switches as well as for disconnectors from other
manufacturers, see page 10.
2
RUHRTAL
Partner of Energy Suppliers since 1922
RUHRTAL is a company with decades of experience in The use of components with high mechanical
the field of high voltage switchgear. A large number strength leads to a high seismic withstand capability
of innovations is the basis for RUHRTAL's world-wide of the disconnectors and earthing switches.
reputation.
Our experience and service
With our large production range of high voltage
switchgear and the corresponding services, we offer Your economic advantage
our customers technologically and economically Delivery of the high voltage switchgear in pre-
optimal solutions for their requirements. assembled and pre-adjusted main components
The extensive testing system and the quality system
certified in accordance with DIN EN ISO 9001have Easy installation and commissioning
guaranteed the reliability of our disconnectors and Low maintenance effort
earthing switches for many decades.
RUHRTAL high voltage switchgear meet all require- Availability of spare parts for at least 25 years
ments regarding an economic operation and a long
Life expectancy of more than 40 years
lifetime. RUHRTAL disconnectors and earthing switches
have proved to be successful in areas with Availability of complete services at short notice
unfavourable climatic conditions. They are used in
industrial and in coastal areas as well as in regions Technical support for the whole lifetime
with extreme variations in temperature and with
heavy ice loads.
Certified quality management in accordance with DIN EN ISO 9001
3
RUHRTAL
Centre Break Disconnectors
The centre break disconnector is the most frequently The current path of the RUHRTAL centre break
used disconnector type. disconnectors consists of only a few components;
The switch base (1) carries the operating mechanism thus the number of contact resistances is reduced to
(2) and two rotatable supporting insulators (3). a minimum.
The current path arms (4) which are fixed to the
insulators open in the middle. In the contact head (6) the current is transferred from
the terminal palm (8) to the current path tube (9) by
Each rotating unit (5) comprises two high-quality ball high-flexible copper leads (7). The bearing is not load-
bearings and is designed for high mechanical loads. ed by the current flow. The copper leads guarantee
It is greased for life and therefore maintenance-free. the smooth running of the bearings at the high
voltage terminal palms. The high voltage conductors
remain in their position during the switching
4 operation.
The main contact system consists of block contacts
and spread contact fingers. RUHRTAL contact systems
guarantee a steady contact force even after years of
operation. This is the reason why we intentionally
3 3 avoid the use of any type of springs for the contact
system.
The modular design of the RUHRTAL centre break
disconnectors offers various possibilities to adapt the
switchgear to changed requirements in substations,
even while the units are in service :
Modification from side-by-side into in-line
5
arrangement or vice versa
5
Refurbishment to higher rated currents and short-
circuit capabilities
1
Later installation of earthing switches
2 Modification from earthing switch no. 1 to earthing
switch no. 2 or vice versa
Centre break disconnector
9 7 8
Current path for 2500 A with copper leads in the contact head
4
Pantograph Disconnectors
The photo on the right illustrates the most important
components of the pantograph disconnector:
1 Scissors arms
2 Bearing frame
3 Support insulator
4 Rotating insulator
5 Motor operating mechanism
In the joints rotary contact systems with high thermal
and dynamic current carrying capacity, are used for
current transfer. The geometry of the pantograph
ensures an optimal operating behaviour. The rigidity of
the scissors arms prevents an opening during a short-
circuit. Ice loads of up to 20 mm can be broken
1
without difficulty.
The position of the fixed contact can change,
depending on weather conditions (solar radiation or
ice load) and substation design. RUHRTAL pantograph
2
disconnectors provide a large catch range in which
the scissors arms are short-circuit-proof in all
positions.
The smooth movement during the switching
operation is typical for the RUHRTAL pantograph
disconnectors. The specific contact force is pre-
adjusted at our factory and remains unchanged during
the entire lifetime.
4 3
In both end positions of the disconnector the lever
gear unit in the bearing frame is switched beyond the
dead-centre position. A change of the switching
position caused by external forces is thus not
possible.
The RUHRTAL production programme for pantograph
disconnectors covers the voltage ranges from 123 kV
up to 300 kV, alternatively with a common operating 5
mechanism or with one operating mechanism per
phase. For voltages above 300 kV disconnectors with
single pole operating mechanisms are used.
Components of the pantograph disconnector
5
RUHRTAL
Vertical Break Disconnectors
In both end positions the lever gear unit is switched
beyond the dead-centre position. As a result, in the
closed position (switching position ON) the current
path is locked, even in the case of a short-circuit. In
the switching position OFF the current path always
remains open.
The great distance between supporting and rotating
insulator guarantees the dielectric strength of the
parallel insulation, even in the case of high loads
under saline fog conditions.
The moving part of the current path is one single
subassembly which is assembled and pre-adjusted at
our factory.
Vertical break disconnector, ON position
The current path of the vertical break disconnector
opens in the vertical direction and thus makes small
phase distances possible.
The current path of the RUHRTAL vertical break
disconnector carries out two movements:
A vertical swinging movement
A rotary movement around its own longitudinal axis
The rotary movement produces the contact force and
breaks possible ice coatings.
Vertical break disconnector, OFF position
6
Double Side Knee-Type
Break Disconnectors Disconnectors
This disconnector type requires small space, in the
horizontal as well as in the vertical direction.
RUHRTAL knee-type disconnectors are mainly used in
123 kV indoor substations. Typical arrangements are
wall or underslung mountings.
Due to the middle joint of the main current path, the
distance of the opened disconnector to adjacent
substation components is extended.
Double side break disconnector, special design for 800 kV
This disconnector type consists of three supporting
columns, the middle one is rotatable and carries the
main current path.
Double side break disconnectors are mainly used in
substations where small phase distances must be
kept and a vertical opening of the current path is not
possible. In the same way as for the other types of
disconnectors the contact force is produced by the
spread type contact fingers.
Wall-mounted knee-type disconnector, ON position
7
RUHRTAL
Switch
Disconnectors Earthing Switches
The use of earthing switches ensures that the
switchgear or other parts of the electric circuit
are de-energised and grounded.
RUHRTAL free-standing earthing switches can be
offered for all voltage levels up to 800 kV.
If necessary, RUHRTAL disconnectors can be equipped
with one or two built-on earthing switches.
Additionally, it is possible to design the earthing
switches for switching of induced inductive and
capacitve currents in accordance with IEC 61129.
Top view of a centre break disconnector with two earthing switches
(first earthing switch red, second earthing switch blue)
Switch disconnector
The RUHRTAL product range comprises also double
side switch disconnectors from 72.5 kV up to
245 kV for special purposes. They are suitable for
switching low currents, for instance magnetising
currents of transformers operating at no-load.
We can advise you on the decision whether our
switch disconnectors are suitable for your specific
requirements.
8
Motor Operating Mechanisms
The reliability of our high voltage switchgear is mainly The opening is secured by a swivel-mounted shutter.
determined by the high quality of the RURHTAL motor Opening the shutter automatically interrupts the
operating mechanisms. motor and control circuit, protecting the site
personnel against inadvertent operation of the high-
The RURHTAL motor operating mechanisms consist of voltage switchgear by remote control.
three main subassemblies: For maintenance work the operating mechanism can
Aluminium casting housing with door (1), degree of be blocked additionally by an interlocking device.
protection IP55 The RUHRTAL auxiliary switch is form-fit connected to
Gear unit (2) with motor the gear and indicates the switching position
Electrical equipment with auxiliary switch (3) absolutely reliably, thereby guaranteeing the safe
operation of the substation.
Sequence chart
OFF Travel ON
Main contact
Aux. contacts
NO contact
NC contact
90° 45° 0° 0° 45° 90°
OFF Aux. switch runs Aux. switch in Aux. switch runs ON
mid position
1 2
The auxiliary switch moves and the position indication
is cancelled. Then the disconnector operates until the
3 end position is reached. Only after the main contacts
have reached the end position, does the auxiliary
switch move again to indicate the switching position.
This process guarantees that the ON position is only
indicated, when the switchgear can carry rated
currents safely and withstand short circuit currents.
Further advantages of the RUHRTAL motor operating
mechanisms:
The complete electrical equipment is fixed on a
mounting plate. In case of replacement of the
motor, this plate can be swung out of the housing
by loosening three bolts without removing the
wiring.
Motor operating mechanism The RUHRTAL motor operating mechanisms are
equipped with a diagnostic interface for measuring
The motor operating mechanism can also be operated motor current and motor voltage. This measuring
manually. For this a hand crank is inserted into an device can be procured from RUHRTAL on request.
opening easily accessible from the ground.
9
RUHRTAL
Contact Systems
Commutating Contacts
The RUHRTAL contact systems have proved their
reliability during decades of operation.
The most important characteristic features are:
The contact systems consist of only a few parts
They are self-cleaning
The contact fingers are of highly welding-resistant
material
The contact fingers are self-resilient
The contact force remains stable throughout its
lifetime
No adjustment is ever necessary
The contact system can withstand heavy ice
conditions
In case of short-circuits the contact force increases
automatically
On request we offer dry-lubricated contact systems,
which allow 20 years of maintenance-free operation.
2500 operating cycles have been verified. Re-greasing
which is admissible according to IEC 60129 after 1000
operating cycles is not necessary. Thus the
maintenance costs for all RUHRTAL centre break
disconnectors, double side break disconnectors,
vertical break disconnectors, knee-type disconnectors
and earthing switches are reduced considerably.
The optimised geometry of the current paths and the
contacts guarantees their efficiency and a maximum
lifetime.
Contact system of a pantograph disconnector with commutating contacts
Commutating contacts are available for all types of
disconnectors. They are also suitable for later
installation.
They are capable of transferring load currents from
one busbar to another without interruption in
accordance with the requirements of IEC 61128.
RUHRTAL commutating contacts for non-destructive
load transfer as per IEC 61128 can also be used for
switchgear of other manufacturers.
Opening main contacts of a centre break disconnector
10
Innovative Technology of RUHRTAL
Since 1971 RUHRTAL 245 kV disconnectors for
400 kA peak current and 160 kA-1s short- time
current have been used in the KEMA test
laboratories.
RUHRTAL 150 kV disconnectors with earthing
switches for 400 kA peak current and 160 kA-1s
short-time current are in use at the PEHLA high-
power testing station of Siemens AG in Berlin
420 kV RUHRTAL disconnector with integrated surge
arrester of Siemens AG
300 kV and 420 kV RUHRTAL earthing switches for
quenching ferroresonance currents
245 kV RUHRTAL five-columns switch disconnector
with four isolating distances in series and one
common operating mechanism. This type of
disconnector is used for switching cable-charging
currents.
Centre break disconnector with integrated surge arrester
Five-columns switch disconnector
11
For further
Information
please fax this page to
Name
the following number:
Position
Fax +49 2327 996 229
Company
Street
Postcode/City/Country
Telephone/Telefax
E-mail
Please send more detailed information to the following subjects:
RUHRTAL Centre Break Disconnector
RUHRTAL Pantograph Disconnector
RUHRTAL Vertical Break Disconnector
RUHRTAL Double Side Break Disconnector
RUHRTAL Knee-Type Disconnector
RUHRTAL Earthing Switches
RUHRTAL Switch Disconnectors
RUHRTAL Motor Operating Mechanisms
RUHRTAL Contact Systems
RUHRTAL GmbH & Co. OHG
Hohensteinstraße 16
D-44866 Bochum-Wattenscheid
Germany
Tel. +49 2327 996 0
E-mail: info@ruhrtal-high-voltage.de
http://www.ruhrtal-high-voltage.de
RUHRTAL is a company of the SIEMENS Group Subject to alterations Order No. 927 00498 176 A
Printed in Germany
By 09012.0
