Medium-voltage vacuum generator circuit breakers, stationary type

Suitable for generators up to 200 MW

24 kV
  • For 10 MW to 80 MW machines

  • Rated short-time withstand current up to 72 kA

  • Rated continuous current up to 6,000 A

Stationary type, medium-voltage vacuum generator circuit breakers

Siemens offers a fully customizable stationary type vacuum generator circuit breaker tested to IEEE C37.013. Each design is engineered to meet the specific electrical and mechanical application requirements of the project. 

Stationary type GCB

Features

Features include:

  • Continuous ratings of 3,000 A, 4,000 A, 5,000 A and 6,000 A 
  • Interrupting ratings of 50 kA, 63 kA, and 72 kA 
  • Maximum design voltage up to 24 kV 
  • Tested to IEEE C37.013 and C37.013a standard for generator circuit breakers 
  • Meets or exceeds the latest ANSI, IEEE, and NEMA standards 
  • Up to 50 full-fault interruptions 
  • No SF6 gas for insulation or interruption 
  • Pair with Siemens protective relays to provide complete generator protection 
  • Uses the latest developments in vacuum interrupter technology 
  • Highly reliable vacuum interrupters - MTTF over 50,000 years 
  • Common type 3AH3 operator platform 
  • Over 120,000 type 3AH3 operators produced since 1998 
  • Five-cycle interrupting time; threecycle interrupting time optional 
  • Complete enclosure shipped as a unit 
  • Stationary (fixed) mounted construction with disconnect and/or grounding switches on transformer side and generator side 
  • Front-accessible circuit breaker operating mechanism for ease of maintenance 
  • Self-cooled ratings available to 4,000 A and higher (ratings dependent) 
  • Arrangements available for typical non-segregated phase bus duct connections 
  • Optional arrangements for segregated-phase bus duct, cable duct, or other connections 
  • Current and voltage transformers available to suit specifications. 

For smaller machines under 80 MW, refer to Siemens drawout type vacuum generator circuit breaker offering.

 

Ratings

Rated values and related capabilities
 
 

IEEE C37.013

clause

Units
Circuit breaker type 17.5
Circuit breaker type 24.0
Rated maximum voltage (V)
 
 
5.1
kV
17.5
24.0
Power frequency
 
 

5.2

Hz

60

60

Rated continuous current
 
 

5.3

A

3,000, 4,000, 5,000, 6,000

3,000, 4,000, 5,000, 6,000

Rated dielectric strength (withstand voltage)
Rated power frequency (dry)
 

5.4.2 C37.013a, Table 4

kV

50

60

Rated dielectric strength (withstand voltage)
Rated full wave impulse (1.2 x 50)
 

5.4.2 C37.013a, Table 4

kV peak

110

125

Rated short-circuit duty cycle
 
 

5.5

 

CO-30 min-CO

CO-30 min-CO

Rated interrupting time1
 
 

5.6

ms

83

83
Rated closing time
 
 
5.7
ms
<80
<80
Rated short-circuit current 
System source (100%) (I)
 

5.8.1

kA symmetrical

50/63/72

50/63/72

Rated short-circuit current 
Generator source (50%)
 

5.8.2.3

kA symmetrical

25/31.5/36

25/31.5/36

DC component
 
 
 

%

75/65/65

50/63/72
Asymmetry ratio (historical "S" factor)
 
 
 
 

1.45/1.36/1.36

25/31.5/36
Asymmetrical interrupting (ref)
 
 
 

kA rms

73/86/98

73/86/98
Delayed current zero capability
 
 
 

ms

40/40/25

30/30/25
Close-and-latch current capability (274% I)
 
 
 

kA peak

137/173/198

137/173/198
Short-time current carrying capability (100% I)
 
 

5.8.2.7

kA symmetrical

50/63/72

50/63/72
Short-time current duration
 
 

5.8.2.7

s

3

3
Transient recovery voltage (TRV) rating
System source
E2 peak voltage

5.9 C37.013a, Table 5

kV

32.2/32.2/31.0

44.2
TRV
System source
RRRV (TRV rate)

5.9 C37.013a, Table 5

kV/µs

4.5

4.5
TRV
System source
T2 time-to-peak

5.9 C37.013a, Table 5

µs

8.4

11.5
TRV
Generator source
E2 crest voltage

C37.013a, Table 6

kV

32.2/32.2/31.0

44.2
TRV
Generator source
RRRV (TRV rate)

C37.013a, Table 6

kV/µs

1.6

1.6

TRV
Generator source
T2 time-to-peak

C37.013a, Table 6

µs

23.6

32.4

TRV
Generator source
E2 crest voltage

C37.013a, Table 9

kV

45.5/45.5/45.5

62.4

TRV
Generator source
RRRV (TRV rate)

C37.013a, Table 9

kV/µs

3.3

3.3

TRV
Generator source
T2 time-to-peak

C37.013a, Table 9

µs

18.5

25.4

Rated load current switching capability
 
 

5.10

A

3,000, 4,000, 5,000, 6,000

3,000, 4,000, 5,000, 6,000

Out-of-phase current switching capability
 
 

5.12

kA

25/31.5/36

25/31.5/36

Mechanical endurance
 
 
 

Operations

10,000

10,000

Footnote:

Interrupting time is based on the first current zero occuring not later than 66 ms after fault initiation, for example, %dc component <100.

 

2 Type testing to be completed.

Mailing address

Siemens Industry, Inc.

7000 Siemens Road

Wendell, North Carolina 27591

United States