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| Customization: | Available |
|---|---|
| Breaking Capacity: | High Voltage Circuit Breakers |
| Operation: | Electric Type |
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| SCHEDULE F | |||||
| No. | Description | Particulars | OFFER | ||
| 400KV CIRCUIT BREAKER | |||||
| 1 | Normal current rating | A | 2500 | 2500 | |
| 2 | Fault rating | kA | 100 | 100 | |
| 2.1 | Making current | kAp | 40 | 40 | |
| 2.2 | Breaking current under out of phase conditions | kA | 10 | 10 | |
| 2.3 | Maximun overvoltage factor on any switching duty | pu | < 2.5 | 1.05 | |
| 3 | Operating sequence | ||||
| 3.1 | Normal | 0-10s-CO-3min-CO | O-10S-CO-3MIN-CO | ||
| 3.2 | Auto reclosing single phase | 0-0.3s-CO-3min-CO | O-0.3S-CO-3MIN-CO | ||
| 3.3 | Delayed three phase auto reclose cycle adjustable dead time range | ms | 2-30 | 2-30MS | |
| 3.4 | High speed single phase auto reclose cycle adjustable dead time range | s | 0.3-2.0 | 0.3-2.0 | |
| 3.5 | Number of closing operations under out of synchronous conditions | pu | 2 | 2 | |
| 4 | Transient recovery voltage | - | |||
| 4.1 | First phase to clear factor | pu | 1.3 | 1.3 | |
| 4.2 | Surge impedance for short line fault test | ohms | 450 | 450 | |
| 4.3 | Minimum voltage to earth when switching capacitive currents,( 1.2 times rated phase to earth voltage ) | kV | 291 | 291 | |
| 4.4 | Voltage across circuit breaker under out of phase | ||||
| switching conditions | pu | 2 | 2 | ||
| 5 | Electro mechanical performance | ||||
| 5.1 | Maximum total break time throughout complete rating , | ||||
| ie trip coil initiation to final arc extinction (applicable) only to 100% rating for oil break circuit breakers ) | ms | 50 | 50 | ||
| 5.2 | Maximum time interval between closure of first and last phase of three phase circuit breakers | ms | 3 | 3 | |
| 5.3 | Maximum time interval between closure of interrupters of one phase of the circuit breaker | ms | 2 | 3 | |
| 5.4 | Maximum time interval between opening of first and last phase of three phase circuit breaker | ms | 3 | 3 | |
| 5.5 | Maximum time interval between opening of interrupters | ms | 2 | 2 | |
| 6 | Insulation level ( IEC 694 ) | ||||
| 6.1* | Lightning impulse withstand ( 1.2/50 wave ) positive | ||||
| and negative | |||||
| a. To earth , closed contacts | -kVp | 1425 | 1425 | ||
| b. Across , open contacts | -kVp | 1665 | 1665 | ||
| 6.2* | Switching impulse withstand ( 250/2500 wave )- positive and negative Dry / wet | ||||
| a. To earth , closed contacts | -kVp | 1050 | 1050 | ||
| b. Across , open contacts | -kVp | 1245 | 1245 | ||
| 6.3* | Power frequency withstand Dry / wet | ||||
| a. To earth , closed contacts - 1 minute | kV | 520 | 520 | ||
| b. Across , open contacts - 1 minute | kV | 610 | 610 | ||
| 7 | Ancillary equipment | ||||
| 7.1 | Number of trip coils required | 2/pole | 2/POLE | ||
| 7.2 | Number of closing coils required | 1/pole | 1/POLE | ||
| 7.3 | Degree of protection | IP 55 | IP55 | ||
| · For SF6 circuit breakers , insulation levels at minimum SF6 gas working pressure , at15 C. | YES | ||||
| * Based tests ( Impulse + ACp ) , required on switchgear for 300kV and above . | YES | ||||
| + Wet tests are required on outdoor open-terminal switchgear . | YES | ||||
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