High-voltage Disconnect Switches Are Equipped With Multiple Safety Protection Systems

In the operation of the power system, the High Voltage Disconnect Switch plays an important role in isolating power sources and protecting equipment. To address the risks posed by high-voltage environments, manufacturers incorporate multi-layered protection mechanisms during the equipment design phase.

Mechanical interlocking devices are a fundamental protection measure. A linkage mechanism is installed between the operating handle and the disconnect switch, ensuring that the disconnect switch can only be operated when the circuit breaker is open. This hardware-level restriction eliminates the dangerous operation of disconnecting under load. The grounding disconnect switch is equipped with an independent operating mechanism, requiring the main disconnect switch to be disconnected before closing, forming a mandatory operating sequence.

Insulation configuration employs a multi-level protection design. Post insulators are made of ceramic or composite materials, with a withstand voltage rating at least 1.5 times higher than the rated voltage. The contact parts of the disconnect switches are silver-plated, reducing contact resistance and improving corrosion resistance. Outdoor high-voltage disconnect switches are equipped with an anti-flashover coating, maintaining insulation performance even in rainy or foggy weather.