Detailed Explanation Of The Inspection And Operation Steps Before High-voltage Isolating Switch Operation

Before the grounding wire is removed, high voltage isolator cannot be closed.
During maintenance, high voltage isolator switch with grounding knife should be carefully checked to ensure that the mechanical interlocking device of hv isolator main blade and hv isolator switch grounding knife is in good condition. The grounding knife should be opened first when the main blade is closed.
A mechanical interlock should be installed between high voltage electrical isolator and the circuit breaker. Usually, a connecting rod mechanism is used to ensure that isolator high voltage cannot be opened when the circuit breaker is in the closed position;