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.