Live tank circuit breakers

Over

1
  • live tank circuit breakers in use in 140 countries

  • for applications from 72.5 kV to 800 kV, up to 80 kA.

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Product overview

Overview of our live tank circuit breakers

We offer our live tank circuit breakers for applications from 72.5 kV to 800 kV, up to 80 kA. Depending on the requirement, you can choose from live tank circuit breakers with three-pole (one drive for three poles) or single-pole (three drives for three poles) operation, as well as from porcelain or composite insulators. Our live tank circuit breakers are suitable for all different types of applications, from use in extreme temperatures to earthquake regions. In these circuit breakers, the interrupter unit is not grounded during operation – it is exposed to high voltage.

Main features:

  • For applications from 72.5 kV to 800 kV, up to 80 kA
  • Spring drive mechanism (3AP) or electrohydraulic operating mechanism (3AT)
  • Self-compression principle (≤ 245 kV) or dynamic self-compression principle (≥ 245 kV)
  • Available with single- (FI, FE) or three-pole operation
  • Suitable for temperatures from -60 up to +55°C
  • Available with porcelain or composite insulators
  • Seismic withstand capability up to 0.3 g or 0.5 g
  • Gas leakage rate of less than 0.1 % per year
  • Type tested according to the latest international standards

Advantages:

  • Easy installation and commissioning: only few subassemblies
  • Inspection after 12 and maintenance after 25 years
  • 10,000 switching operations are guaranteed
  • Service life of up to 50 years
  • Over 107,000 circuit breakers delivered worldwide prove our best practices and years of experience
  • Minimal transportation costs
  • 24-hour service hotline
  • Our global production network saves customers time and transportation costs

Our live tank product families

3AP circuit breaker family from 72.5 kV to 800 kV

Our high-voltage live tank circuit breakers are available for three-pole operation with a common base (FG), for single-pole operation also with a common base (FE) or for single-pole operation with separate bases (FI). 3AP1 circuit breakers up to 300 kV are equipped with one interrupter unit per pole and 3AP2 circuit breakers up to 550 kV include two interrupter units. The circuit breakers can be equipped with optional closing resistors (3AP3) for applications from 362 kV to 550 kV. The 3AP4 includes 4 interrupter units per pole and can also be delivered with closing resistors on request (3AP5).

Technical Data

 
 
 
 
 
 
 
3AP1
3AP2/3
3AP4/5
Rated voltage
kV
72,5
123
145
170
245
300
420
550
800
Number of interrupter units per pole
 
1
2
4
Rated power-frequency withstand voltage
kV
140
230
275
325
460
460
610
800
830
Rated lightning impulse withstand voltage / min
kV
325
550
650
750
1050
1050
1425
1550
2100
Rated switching impulse withstand voltage
kV
-
850
1050
1175
1425
Rated normal current, up to
A
2500
4000
4000
4000
4000
4000
5000
5000
5000
Rated short-circuit breaking current, up to
kA
40
40
40
40
63
40
80
63
63
Temperature range
°C
-60 up to +55
Rated operating sequence
 
0-0,3 s-CO-3 min-CO or CO-15 s-CO
Rated break time
 
3 cycles
2 cycles
Rated frequency
Hz
50 or 60
Maintenance after
 
25 years

All values in accordance with IEC, other values on request

3AT circuit breaker with double-nozzle system

The 3AT circuit breaker with double-nozzle system is especially suitable for special applications, such as the restrike-free interruption of low inductive and capacitive currents and the interruption of all types of short-circuits up to 80 kA, as well as HVDC applications.

Technical data

 
 
 
 
 
 
3AT2/3
3AT4/5
Rated voltage
kv
245
300
362
420
550
362
420
550
800
Number of interrupter units per pole
 
                                  2
                          4
Rated power-frequency withstand voltage
kV
460
460
520
610
800
450
520
620
830
Rated lightning impulse withstand voltage / min
kV
1050
1050
1175
1425
1550
1175
1425
1550
2100
Rated switching impulse withstand voltage
kV
    -
850
950
1050
1175
950
1050
1175
1425
Rated normal current, up to
A
                                                      4000
Rated short-time withstand current (1s - 3s), up to
kA(rms)
80
63
63
63
63
80
80
63
63
Rated short-circuit breaking current, up to
kA
80
63
63
63
63
80
80
63
63
Temperature range
°C
                                                   -25 up to +50
Rated operating sequence
 
                     0-0,3 s-CO-3 min-CO or CO-15 s-CO
Rated break time
 
                                                     2 cycles
Rated frequency
Hz
                                                    50 or 60
Maintenance after
 
                                                    25 years

All values in accordance with IEC; other values or request

3AV circuit breaker with vacuum technology

The new generation of high-voltage circuit breakers is based on over 40 years of experience in the production of medium-voltage vacuum interrupters and over 5.5 million units delivered.

Siemens has introduced this proven technology to high-voltage power networks above 72.5 kV and has been gaining operational experience in European networks since 2010.

Most important characteristics and advantages:

  • Technology based on 40 years of experience and 5.5 million delivered vacuum tubes
  • Perfect for low temperature applications 
  • Completely type-tested acc. to latest international standards
  • Maintenance free and low operational costs throughout the entire lifecycle due to “sealed for life“ interrupter unit; minimum efforts for gas handling
  • No CO2e (equivalent) emissions
  • Switch medium (vacuum) with greenhouse potential (GWP) = 0
  • No CO2e emissions during operation, maintenance or recycling
  • No emission or emission compensation costs throughout the service life

Technical data

Rated voltage
kV
72.5
145
Vs. SF6 breaker 145 kV
Number of guaranteed operations
at rated short-time withstand current (40 kA)
 
30
30
10-12
Number of interrupter units per pole
 
1
1
1
Rated break time
 
2cycle (50 Hz)
2cycle
3cycle
Rated normal current, up to
A
3150
3150
3150
Rated short-time withstand current, up to
kA
40
40
40
Rated short-circuit breaking current, up to
kA
40
40
40
Rated frequency
Hz
50 / 60
50
50 / 60
Rated power-frequency withstand voltage
kV
160
275
275
Rated lightning impulse withstand voltage
kV
350
650
650
Rated duration of short-circuit
s
3
3
3
Rated peak withstand current (2.7 p.u.)
kA
108
108
108
First-pole-to-clear-factor
p.u.
1.5 / 1.3
1.5 / 1.3
1.5 / 1.3
Capacitive voltage factor
p.u.
1.7
1.4
1.4
Temperature range
°C
-60 up to +55
-60 up to +55
-30 up to +55
Maintenance after
 
12 years visual inspection
25 years visual inspection
up to 10,000 operations at 3150 A
12 years visual inspection
25 years visual inspection
up to 10,000 operations at 3150 A
12 years visual inspection
25 years revision
up to 6,000 operations at 3150 A
Insulating medium
 
Clean Air
Clean Air
SF6
Amount of SF6 / CO2 equivalent / Global Warming Potential
 
0 / 0 / 0
0 / 0 / 0
9,2 kg / 209,760 kg / 209,760

Vacuum interrupters

Siemens has over 40 years of experience in producing medium-voltage vacuum interrupters and delivered more than 5.5 million units.

Siemens introduced this proven technology to high-voltage power networks in 2010. The hermetically sealed vacuum interrupters are reliable and maintenance free thanks to its “sealed for life” technology.

The most important characteristics and advantages:

High performance

  • Suitable for frequent switching: high number of short circuit interruptions with excellent switching features over the entire service life of the vacuum interrupter

Perfect for low temperatures

  • Switch medium does not liquefy

No CO2e (equivalent) emissions

  • Switch medium (vacuum) with greenhouse potential (GWP) = 0
  • No CO2e emissions during operation, maintenance or recycling
  • No emission or emission compensation costs throughout the service life
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You can find details on our live tank circuit breakers and information about our services here.

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Testing laboratories at Schaltwerk Berlin

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Testing laboratories at Schaltwerk Berlin

Numerical simulation and analytical calculation methods for efficient product development.

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