Pre-Commissioning check for indoor vacuum circuit breaker

Breaker Contact Resistance Test

Testing and commissioning of indoor Vacuum circuit breaker Physical Inspection and Mechanical checks:- Check the circuit breaker, vacuum bottle and insulators for cracks or other signs of physical damage. Check the tightness of connections, including flexible connection between vacuum bottle and busbar. Switch off control power to the breaker of disconnect the control plug. Discharge the closing and tripping springs- this done by first tripping the breaker (if it is closed), then closing the breaker, then tripping it again. Open the cover of the mechanism box. Check for damage, check…

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