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Rated values and related capabilities
Rated maximum voltage (V)
Power frequency
Rated continuous current
Rated dielectric strength (withstand voltage)
1. Power frequency, one minute
2. Impulse
Rated short-circuit duty cycle
Rated interrupting time
1
Rated short-circuit current
1. System source (100%) (I)
2. Generator source (50%)
dc component
Asymmetry ratio (historical "S" factor)
Asymmetrical interrupting (ref)
Delayed current zero capability
Close and latch capability (274% I)
Short-time current carrying capability (100% I)
Short-time current duration
Transient recovery voltage (TRV) rating
System source
1. E
peak voltage
2
2. RRRV (TRV rate)
3. T
time-to-peak
2
Generator source
1. E
crest voltage
2
2. RRRV (TRV rate)
3. T
time-to-peak
2
Out-of-phase switching
1. E
crest voltage
2
2. RRRV (TRV rate)
3. T
time-to-peak
2
Rated load-current switching capability
Out-of-phase current switching capability
Mechanical endurance
Footnotes:
Interrupting time is based on the first current zero
1
occurring not later than 66 ms after fault
initiation, for example, %dc component <100.
"xxxx" in type designation refers to the continuous
2
current rating 1,200 A, 2,000 A or 3,000 A, as
appropriate. The 4,000 A fan-cooled rating is
achieved using a 3,000 A circuit breaker in
combination with fan cooling in the switchgear
structure.
IEEE C37.013
Units
clause
5.1
kV
5.2
Hz
5.3
A
5.4.2 C37.013a,
kV
Table 4
kV peak
5.5
5.6
ms
5.8.1
kA sym
5.8.2.3
kA sym
%
----
kA rms
ms
kA peak
5.8.2.7
kA sym
5.8.2.7
s
5.9
kV
C37.013a, Table 5
kV / µs
µs
kV
C37.013a, Table 6
kV / µs
µs
kV
C37.013a, Table 9
kV / µs
µs
5.10
A
5.12
kA
operations
Table 14: Type GMSG-GCB generator circuit breaker rated values and related capabilities
Circuit breaker type
15-GMSG-GCB-
15-GMSG-GCB-
40-XXXX-110
50-XXXX-137
15.0
15.0
60
60
1,200, 2,000,
1,200, 2,000,
3,000, 4,000 FC
3,000, 4,000 FC
38
38
95
95
CO-30 min-CO
CO-30 min-CO
< 80 ms
< 80 ms
40
50
20
25
75
64
1.46
1.35
57.9
67.5
40
30
110
137
40
50
3
3
27.6 (1.84 V)
27.6 (1.84 V)
3.5
4.5
9.3 (0.62 V)
7.2 (0.48 V)
27.6 (1.84 V)
27.6 (1.84 V)
1.6
1.8
20.25 (1.35 V)
18.0 (1.20 V)
39.0 (2.6 V)
39.0 (2.6 V)
3.3
4.1
13.4 (0.89 V)
10.8 (0.72 V)
1,200, 2,000,
1,200, 2,000,
3,000
3,000, 4,000
20
25
10,000
10,000
2
15-GMSG-GCB-
63-XXXX-173
15.0
60
1,200, 2,000,
3,000, 4,000 FC
38
95
CO-30 min-CO
< 80 ms
63
31.5
61
1.32
83
30
173
63
3
27.6 (1.84 V)
4.5
7.2 (0.48 V)
27.6 (1.84 V)
1.8
18.0 (1.20 V)
39.0 (2.6 V)
4.1
10.8 (0.72 V)
1,200, 2,000,
3,000, 4,000
31.5
10,000
65
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