Risk Of Electric Shock Due To Misoperation Of High-voltage Disconnect Switches

The most common manifestation of misoperation is pulling High Voltage Disconnect Switch under load. High-voltage disconnect switches lack arc-extinguishing devices; when a strong arc is generated between the contacts, it can damage the equipment and cause a phase-to-phase short circuit. If an operator opens the switch at the wrong time, the instantaneous arc can cause severe burns. Statistics show that violations of operating procedures account for the majority of all electric shock accidents.

Poor contact is another contributing factor. During long-term operation, if the disconnect switch's mechanism box is not properly sealed, water can enter, leading to corrosion of internal components. If operation and maintenance personnel fail to regularly check the condition of transmission components, pins, and accessories, rust can flake off, hindering normal operation. This forces operators to use excessive force, increasing the risk of electric shock.