High-Voltage Centre Break Disconnectors
72.5 kV up to 420 kV
Answers for energy.
Combining Forces
Well-known Design meets
Best Price-Performance Ratio
Siemens is investing in research and development in order to manufacture the
products you need now and will want in years to come. Decades of experience in
high-voltage equipment go into the design and production of our products and
set international trends. No matter what your application is, our high-voltage
products provide the best solution for your requirements every time.
With our high-voltage centre break disconnectors and earthing switches for
rated voltages from 72.5 up to 420 kV, we fulfill customers‘ demands for reliability, safety and cost-effectiveness. By combining the strengths of our well proven
product portfolio, we can provide this type of centre break disconnector.
By using the well-known maintenance-free contact system from Ruhrtal, we took
the best of what disconnector technology has to offer and designed a family of
disconnectors especially for your specifications. We meet the high standard of
quality that Siemens is known for combined with our customers‘ requirements
for cost-effective disconnector products. With this centre break family, you have a
reliable competitive solution with complete safety and peace of mind.
Highlights:
Maintenance-free contact system without spring elements
Approved technology applied in more than 40,000 units
Type-tested according to IEC 62271-102
Rated current up to 3150 A, up to 50 kA – 3 sec
Best price-performance ratio
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The Centre Break
Disconnectors from Siemens
Our centre break disconnector family is available for rated voltages from 72.5 kV
up to 420 kV. The centre break disconnector is the most frequently used disconnector type worldwide. The base frame (4) carries the compact operating mechanism (5) and two rotating base mounted supporting insulators (2). In the closed
position, the current flows via the current path arms (1), which are fixed to the
insulators. The disconnector opens in the centre, thus providing an insulating
distance.
Each rotating unit (3) comprises two high quality sealed ball-bearings and is designed for high mechanical loads, therefore providing a maintenance free service
life. These qualities result in low service and investment costs which provide our
customers with competitive advantages worldwide.
1
2
3
4
5
1 Current path arms
2 Supporting insulators
3 Rotating unit
4 Base frame
5 Compact operating mechanism
3
The Contact System
The main contact system has been adopted from the well established range of Ruhrtal high-voltage disconnector products. This system consists of block contacts and spread contact fingers and assures a steady
contact force even after decades of operation. The current flows in the contact head from the terminal (7)
to the current path tube (6) through highly-flexible copper leads (8).
6
7
8
The most significant features are:
Self-resilient contact fingers, no further spring elements necessary to generate the contact force
Factory-set contact forces, no re-adjustments required during service life
Ice layers up to 20 mm can be broken without difficulties
Silver-plated contact surface providing highest conductivity without regular grease lubrication
Maintenance-free contact system up to 25 years
By using the well-established blockfinger contact system, we provide our customers with very practical
advantages: smooth operation, exemplary availability and optimum security.
4
The Earthing Switch
The use of earthing switches ensures absolute safety by grounding and discharging all high-voltage components in a circuit or switchgear. Suitable built-on earthing switches are available for the complete range
of our centre break disconnector types from 72.5 up to 420 kV.
Three-pole centre break disconnector with earthing switch in inboard design
5
Motor Operating Mechanism
2
1
3
The motor operating mechanism includes all components required for operating the disconnector and
consists of three main subassemblies:
1 Corrosion-resistant housing (protection degree IP 55)
2 Gear unit with motor
3 Electrical equipment with auxiliary switch
The motor operating mechanism can also be operated manually by a hand crank which can be inserted
inside the cubicle. The insertion of the hand crank automatically isolates the motor circuit for safety purposes. Heaters are provided to prevent condensation.
6
Technical Data
High-Voltage Centre Break Disconnectors
Rated voltage
Type 3DN1
[kV] 72.5
123
145
245
300
362
420
Rated power frequency withstand voltage
common value
[kV]
140
230
275
460
395
450
520
across isolating distance
[kV]
160
265
315
530
435
520
610
1050
1175
1425
Rated lightning impulse withstand voltage
common value
[kV]
325
550
650
1050
across isolating distance
[kV]
375
630
750
1200 1050 + 170 1175 + 205 1425 + 240
Rated normal current
Rated short-time withstand current (1 s - 3 s)
Temperature range
1250/1600/2000/2500/3150 A
up to 50 kA
-50 ... +50 °C
Rated frequency
50/60 Hz
Control voltage
110/125/220/250 VDC
Motor voltage
110/125/220/250 VDC or
230 VAC, 50 Hz/ 60 Hz
Values in accordance with IEC,
other values on request
7
For further Information
Please fax this page
to the following number:
Fax +49 30/386-25867
Name/Company
or send us an e-mail:
disconnector.ptd@siemens.com
Street
Postal code/City/Country
Phone/Fax
E-mail
Please send me more information on the following topics:
Ruhrtal - Disconnectors and Earthing Switches
High-voltage circuit-breakers: Type 3AP1/2, 72.5 kV to 550 kV
High-voltage circuit-breakers for outdoor installation
Live-tank and dead-tank high-voltage circuit-breakers technology
High-voltage compact switchgear 3AP1 DTC for 145 kV and 245 kV
Eliminate stress: Controlled switching of high-voltage circuit-breakers
SF6 in power engineering - acting responsibly
Further copies of this brochure
Published by and copyright © 2009
Siemens AG
Siemens AG
Energy Sector
Energy Sector
Power Transmission Division
Freyeslebenstrasse 1
High Voltage Products
91058 Erlangen, Germany
Nonnendammallee 104
13629 Berlin, Germany
www.siemens.com/energy
For more Information please contact our
www.hv-circuit-breaker.com
Customer Support Center.
Power Transmission Division
Order No. E50001-G630-A146-X-4A00
Printed in Germany
Dispo-Stelle 30000
Mu. PA 11092.0
Printed on elementary chlorine-free bleached paper.
All rights reserved.
Trademarks mentioned in this document are the property of
Siemens AG, its affiliates, or their
respective owners.
Phone: +49 180 524 7000
Subject to change without prior notice.
Fax: +49 180 524 2471
The information in this document contains general descriptions of the technical options available, which may not apply
cases. The required technical options should therefore be
specified in the contract.
(Charges depending on provider)
Email: support.energy@siemens.com