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