Live tank circuit breakers

We offer live tank circuit breakers for applications from 72.5 kV to    1100 kV, up to 80 kA, suitable for all different types of applications, in extreme temperatures or earthquake regions. Depending on the requirement, you can choose from live tank circuit breakers with three-pole or single-pole operation, as well as from porcelain or composite insulators.

Main features

  • For applications from 72.5 kV to 1100 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 110,000 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

3AV Blue live tank up to 145 kV

The new 3AV generation is based on over 40 years of experience in the production of medium-voltage vacuum interrupters and over 6 million units delivered. Siemens Energy has introduced this proven technology to high-voltage power networks above 72.5 kV in 2010. Since 2017 the new vacuum live tank breakers up to 145 kV are manufactured and sold in series with more than 100 units delivered worldwide.

 

Advantages of vacuum switching technology:

  • Zero greenhouse gases
    - Greenhouse- and F-gas free insulation
    - No CO2e emissions 
  • Zero global warming potential (GWP)
    - No F-gas regulated – reporting, training, frequent density checks
    - Minimized gas handling during operation & end of life (no gas recycling) 
  • Zero impact on environment, health & safety (EHS)
    - No toxic insulation gas, no toxic decomposition products
    - No special safety measures required 
  • Full performance & reliability
    - High number of short-circuit and rated current interruptions
    - Two-cycle current interruption
    - More than 10 years of experience in HV vacuum switching
    - Perfect for lowest temperature applications 

 

Vacuum interrupting technology enables the implementation of clean air as an insulating medium in our Blue portfolio. Our clean air technology - 80% N2 and 20% O2, cleaned and free of humidity (synthetic air) - is the first F-gas-free insulation and represents an important step towards the company goal of developing completely environmentally friendly technologies.

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

3AP circuit breaker family from 72.5 kV to 1100 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).

 
 
 
 
 
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

Our services for you

You can find details on our live tank circuit breakers and information about our services here.

We can gladly help you with installation, commissioning, diagnostics and malfunctions