Side-by-side Phenomenon When Closing High-voltage Disconnecting Switches

At the moment of closing, the stationary and moving contacts of the high-voltage disconnector must be accurately aligned. If there is a significant deviation in the closing depth of each phase, or if the transmission bolts or linkage mechanism are loose or not adjusted to the standard position, contact misalignment can occur, causing one phase to contact first, followed by an arc crossing the misaligned phase, resulting in a side-striking phenomenon.

Wear of mechanical parts and obstruction of the transmission mechanism can also prevent the High Voltage Disconnect Switch from completing its operation smoothly during closing. Prolonged outdoor operation can lead to oxidation and poor lubrication of the contact surfaces, increasing friction and the risk of jamming, causing asynchronous closing of the stationary and moving contacts.