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Appendix
Table 13: Type
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| Measured parameter | Units | Circuit breaker type1 | |||
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| General |
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| Nominal voltage class | kV | 38.0 | ||
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| Nominal | MVA | 1500 | |||
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Rated |
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| Maximum design voltage (V)2 | kV rms | 38.0 | ||
values |
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| Voltage range factor (K)3 | 1.65 | |||||
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| Insulation | Withstand |
| kV rms | 80 | ||
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| kV peak | 150 | |||||
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| Rated |
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| Continuous4 | A rms | 1,200, 2,000, 3,000FC | |
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| kA rms sym | 21 | |||||
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| Interrupting time11 | Cycles/ms | 5/83 | |
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| Permissible tripping delay (Y) | Sec | 2 | ||
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Related |
| Current | Rated maximum design voltage (V) divided by K = (V/K) | kA rms | 23.0 | |||
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| Maximum symmetrical (sym) interrupting (K x I) | kA rms sym | 35 | ||||
capabilities |
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| kA rms sym | 35 | ||||||
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| Closing and |
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| Asymmetrical (1.55 x I)8 | kA rms | 56 | |
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| latching |
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| Peak (2.6 x I)8 | kA peak | 95 | |||
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These ratings are in accordance with:
ANSI/IEEE
ANSI
ANSI/IEEE
ANSI/IEEE
Footnotes:
1“xxxx” in type designation refers to the continuous current rating 1,200, 2,000, or 3,000 A, as appropriate. The 3,000A
2Maximum design voltage the circuit breaker is designed for and the upper limit for operation.
3K is the ratio of the rated maximum design voltage to the lower limit of the range of operating voltage in which the required symmetrical and asymmetrical interrupting capabilities vary in inverse proportion to the operating voltage.
43000FC indicates fan cooling is included in the switchgear structure for this rating. 3000 A rating is not available in outdoor equipment.
5To obtain the required symmetrical interrupting capability of a circuit breaker at an operating voltage between 1/K times rated maximum design voltage and rated maximum design voltage, the following formula shall be used: Required Symmetrical Interrupting Capability =Rated
For operating voltages below 1/K times maximum design voltage, the required symmetrical interrupting capability of the circuit breaker shall be equal to K times rated
6Within the limitations stated in ANSI/IEEE
7Current values in this row are not to be exceeded even for operating voltage below 1/K times rated maximum design voltage. For operating voltages between rated maximum design voltage and 1/K times rated maximum design voltage, follow Footnote 5.
8Current values in this row are independent of operating voltage up to and including rated maximum voltage.
9"Nominal
10Standard duty cycle is CO - 15s - CO.
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