When vacuum interrupters are manufactured or used in the field, there are three tests used to validate their functionality: 1. Contact Resistance Test; 2. High Potential Withstand Test; 3. Leak-rate Test.Contact Resistance TestDuring the contact resistance test, a micro-ohmmeter is applied to the closed contacts of the vacuum interrupter (VI), and the resistance is measured and recorded. The result is then compared against the design specifications and/or the average values for other vacuum inte

Circuit Breaker Operation TestClose Operation Test – Local/RemoteThis test is conducted manually, locally, and remotely. In the manual operation test, the spring is charged manually, and the breaker is closed and opened manually as well. For local operation, control power and AC supply are provided to the spring charging motor, and the circuit breaker is closed using the TNC switch. The function of the closing coil and the operation of the spring charging motor are observed. If remote oper

Vacuum Condition Monitoring in Vacuum InterruptersVacuum interrupters (VIs) serve as the primary circuit interruption medium for medium voltage power systems and are increasingly utilized in low, medium, and high-voltage systems. The performance of VIs hinges on maintaining an internal pressure below 10 hPa (where 1 hPa equals 100 Pa or 0.75 torr). Prior to leaving the factory, VIs are tested to ensure their internal pressure is ≤10^-3 hPa.The performance of a VI correlates with its vacuum le