(1) It is used to isolate the power supply and disconnect the high-voltage maintenance equipment from the live equipment so that there is an obvious disconnection point between them.
(2) The isolating switch cooperates with the circuit breaker, and the switching operation is carried out according to the needs of the system operation mode to change the system operation wiring mode.
(3) Used to turn on or off the small current circuit. The isolating switch can perform the following operations: it can pull and close the bypass current of the closed circuit switch; pull and close the grounding wire of the neutral point of the transformer, but when the neutral point is connected with an arc suppression coil, it can only be used when the system is not faulty. Operation; pull and close voltage transformers and arresters; pull and close the busbar and the capacitive current of the equipment directly connected to the busbar; pull and close the no-load circuit with the capacitive current not exceeding 5A; the triple isolation switch can pull and close the voltage at 10 Loads of kilovolts and below, currents below 15 amperes, etc.
When operating the isolating switch, pay attention to that when the line is powered on, the isolating switch on the bus side should be closed first, then the isolating switch on the line side should be closed, and then the circuit breaker should be closed. When the line is out of power, disconnect the circuit breaker first, and then open the isolating switch. Do not pull or close the high-voltage isolating switch with load.