VCB power frequency withstand voltage testing equipment
To test the insulation performance of vacuum circuit breakers, a voltage withstand test is conducted on the ground, phase to phase, and fracture of the primary circuit. When the circuit breaker is in the disconnected state, a certain power frequency voltage is applied between the moving and stationary contacts to detect the magnitude of the leakage current and the discharge phenomenon in the arc extinguishing chamber, thereby determining whether the vacuum degree of the vacuum arc extinguishing chamber meets the requirements. The magnitude of vacuum degree will directly affect the arc extinguishing performance of vacuum circuit breakers, and a decrease in vacuum degree will cause adverse consequences to the operation of vacuum circuit breakers. Therefore, detecting the vacuum degree of the vacuum arc extinguishing chamber is an important guarantee for the reliable operation of the vacuum circuit breaker.