Potential Risks Of Connecting The Stationary Contact Of A High-voltage Disconnector To A Power Source

In high-voltage power distribution equipment, if the stationary contact is directly connected to the power supply, the conductive part of High Voltage Disconnect Switch will always be energized. The design intent of a disconnector is to ensure that the moving and stationary contacts make contact after closing and maintain a clear air gap after opening.

If the stationary contact is energized, it loses its significance as a "visible disconnection point." Before maintenance, relying solely on the disconnector may not guarantee that the equipment is completely disconnected from the power supply. This conflicts with the disconnector's lack of arc-extinguishing capability—it cannot assume the responsibility of interrupting load current or fault current.

When equipment is energized, accidental operation of the moving contact may generate an electric arc. This situation is particularly dangerous under high-voltage conditions. With the disconnector contacts exposed to air, a short-term electric arc can cause short circuits, burn metal parts, and in severe cases, damage to equipment or personal injury.