High Voltage Disconnect Switch Operation Sequence

The correct operation sequence of High Voltage Disconnect Switch:
(1) First, when operating the isolating switch, you should check that the circuit breaker of the corresponding circuit is in the disconnected position to prevent the isolating switch from being pulled or closed under load.
(2) When the line is shut down or powered on, the isolating switch must be pulled or closed in sequence. When operating the power outage, you must first pull the circuit breaker, then the isolating switch on the line side, and then the isolating switch on the bus side. The power supply operation sequence is the opposite of the power outage sequence. This is because when an erroneous operation occurs, following the above sequence can reduce the scope of the accident and avoid the accident from being expanded to the bus.
(3) During operation, if serious defects such as serious damage to the insulator or serious damage to the transmission rod of the isolating switch are found, the operation shall not be carried out.
(4) When operating the isolating switch, the on-duty personnel should check the opening and closing positions, synchronization conditions, contact contact depth and other items on site one by one to ensure that the isolating switch is operating correctly and in the correct position.
(5) The isolating switch should generally be operated in the main control room. When the remote control electrical operation fails, manual or electric operation can be performed on site, but the permission of the station manager or technical person in charge must be obtained and it can only be performed under on-site supervision.
(6) Electrical, electromagnetic and mechanical locking devices are installed between the disconnector, earthing knife and circuit breaker to prevent misoperation. When switching operations, they must be performed in sequence. If the locking device fails or the disconnector and earthing knife cannot operate normally, the corresponding circuit breaker and knife position status must be checked strictly according to the locking requirements. Only after verification can the lock be released for operation.