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VII.A. 110kV-SF6 circuit breaker
Standard: IEC 62271-100;
Technical Parameters:
Out door, 3 phase, SF6 circuit breaker type
Rated voltage: 123kV.
Rated frequency: 50Hz.
Rated current: 1250A
Number of break chamber of a pole: 1 (one)
Short - time withstand current: 25kA/3s
Rated breaking current: 25kA
Making current: 63 kA (peak)
Percentage of DC component: As per IEC 62271-100;
Operation cycle: 0 - 0.3s - CO - 3min - CO
Total breaking time: 70 ms
Total closing time: 100 ms
Number of breaking operation at full short circuit current: > 20 times
The operating mechanism will have a stainless steel enclosure, IP55 type.
Wired control cubicle including:
+ Operating mechanism type: springs charged
+ Mechanical operation duration: 10,000 times
+ Anti - pumping device
+ Local / remote control switch
+ 1 closing coil
+ 2 tripping coils
+ SF6 density meter with alarm/trip contractor and barometric scale or color scale.
+ Auxiliary contact 12NO/12NC
+ Auxiliary contacts for charged spring signal and motor control
+ Heating and lighting device
+ Self - supply voltage:
* Motor: 380/220 VAC and VDC.
* Opening and closing coil: 220VDC.
Accessories:
- Control cabinet.
- Gas charging device.
- SF6 gas for first filling
- Zinc galvanized Supporting structure
- Terminal for conductor 185 mm2, earthing terminal
- Hand crank
- Document for installation, operation, maintenance, and test report.
Special note: Bidder provides following document for bid evaluation.
- Type test certificate (as per IEC 62271-100).
- List of clients.
- Operating certificate of clients.
- The explanation proves that this type of circuit breaker has advantages in arc quenching principal for breaking small current.
- Characteristics short circuit current - times.
- Time of first release of such type offered circuit breaker.
