what is the 12kV vacuum circuit breaker operation sequence?
1.Basic knowledge of vacuum circuit breaker
is a power appliance for small and medium capacity low voltage circuit, applicable to AC 50Hz, rated voltage of 12kV and below power system. Its working principle is through the use of vacuum arc extinguishing technology, in the closure, in the isolation switch to form a vacuum-like confined space, can effectively prevent the arc generated within the air gap, so as to realize fast and reliable circuit breakers.
2.the vacuum circuit breaker operation sequence
1. When opening and closing operation, should first ensure that the circuit breaker is in the open state.
2. Confirm the position of the circuit breaker, and place the operating handle in the breaking position.
3. Observe the circuit indicator and metering instrument, confirm that the circuit is powerless, and then press the switching button.
4. Wait a few seconds until the vacuum circuit breaker completely breaks the circuit.
5. After confirming that the electrical parameters are correct, place the operating handle in the closing position.
6. Press the closing button and wait a few seconds until the
7. After the operation is completed, observe the circuit indicators and metering instruments to confirm that the circuit is normal.
3. 20, 25, 31.5: points - 0.3s - closing points - 180s - closing points 40, 50KA: points - 180s - closing points - 180s - closing points on this 0.3s, 180s time how to understand?
to ensure that the breaking capacity and the minimum intervals required. Such as the first case is when breaking a first fault current, can be 0.3S after rapid automatic reclosing, if the fault is still there and then breaking, the circuit breaker can not automatically reclosing, only to wait for 180S and then try again, otherwise the circuit breaker can not guarantee that the breaking capacity to meet the rated requirements.
The first point, my understanding should include the fault closing and splitting action, because the reclosing speed after the fault requires the faster the better. This 0.3S can only be the automatic reclosing time, and then after no delay after the closing and splitting action, you need to go through 180S before the closing operation can be carried out again. The second sequential operation steps will not be said, the first is a special case containing automatic reclosing. Normal operation is the second fault closing and splitting operation or single splitting operation requires 180S before you can operate again.
4.In summary
