Analysis Of The Characteristics Of High-voltage Disconnect Switches Malfunctioning Due To Water Ingress

After the casing seal of hv isolator is damaged, rainwater or moisture enters, water immersion or conductive bridging occurs between the contacts, preventing hv isolator switch from operating as expected. When a circuit breaker command is issued but there is no mechanical opening or closing feedback, inspection reveals that the isolating blade of high voltage electrical isolator is stuck and corroded, the lubricant is diluted by water, and the spring tension is weakened. This type of isolator high voltage fault often originates during the rainy season or when the equipment is exposed to a humid environment for a long time, resulting in water and dust accumulation at the bottom of the machine.