High-voltage vacuum contactor failure

High-voltage vacuum contactor is a high-voltage electrical control, power system used in high-voltage motors, power transformers, capacitors and other electrical equipment, remote control and frequent operations. Its generally used in conjunction with current-limiting fuses: Vacuum contactors are used to open and close operation of the electrical equipment running or stopped; fuse for short circuit protection,  mcb circuit breaker melt breaking short-circuit current, cutting off electrical equipment failure. Based on years of field work, encountered more than high-voltage vacuum  circuit breakers , such as closing low voltage failure, the contact resistance is exceeded, the contactor tripping, etc., now the process to organize, for reference. Mechanically held contactors action principle, closing coil energized, the drive rocker closing solenoid driven insulation makes main contact is closed, the closing is completed by the closing contactor locking device will remain in the closing state; closing solenoid opening spring action during compression; sub-gate trip coil energized, the drive to make the closing of gate solenoid locking device tripping driven by the opening spring operating mechanism to achieve sub-gate.