Why is the substation outage at load side switches to pull the bus side gate
It is common sense to break off the load when the power is cut off.Because a bus may carry more than one load, that is to say, the load side current will be smaller than the bus side, the first broken small and then broken, the larger can reduce the arc as much as possible.
Mainly to prevent the circuit breaker without disconnecting the load gate, broach the cause of the accident, the range of influence is small; the load side switches, circuit breakers of the line level play a protective role, such as the first pull bus side gate, will top off a circuit breaker, the scope of the accident.
If the station blackout, first opened the bus side gate, it is possible because of over-current, load caused by arc fault, resulting in a substation circuit breaker protection, will expand the scope of the accident, it will seriously affect the stability and security of power system operation.
1, in the power system, only circuit breaker has enough protection function, can prevent all kinds of possible short circuit, over-current, overload and other faults.2, the station blackout, first opened the load side gate, and then opened the bus side gate, is the use of the protective function of the circuit breaker, to prevent blackout of maloperation of load side gate, overcurrent, caused by the harm brought by short circuiting arc. Even an accident can limit the accident to the smallest extent.
It must be emphasized that the substation outage, to prevent all kinds of accidents that may occur when the power must be after the opening of the breaker, the load side gate, and then opened the bus side gate.
