Design Requirements For The Cutting Depth Of The Moving Contact Of A High-voltage Disconnector

When the moving contact of High Voltage Disconnect Switch engages with the stationary contact, the insertion force of the moving contact must meet the design specifications to prevent accidental poor contact and local overheating under energized conditions. Since the disconnector is not used to interrupt load current when closed, its contact structure requires greater emphasis on contact stability and mechanical strength than that of a circuit breaker.

The moving and stationary contacts should have a specified insertion depth after closure to achieve the specified contact surface dimensions. This reduces heat generation caused by resistance during operation and supports prolonged no-load energization. The relative position and engagement depth of the moving and stationary contacts also affect the overall insulation distance design of the high-voltage disconnector.