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Insulation resistance of high voltage circuit breakers is carried out when

  • The insulation resistance test of high voltage circuit breakers can be carried out when the circuit breaker is open or closed.
  • When the circuit breaker is open, the insulation resistance test is carried out between the different phases and between each phase and ground.
  • When the circuit breaker is closed, the insulation resistance test is carried out between the different phases and between each phase and ground with the circuit breaker in the closed position.
  • However, it is important to note that the insulation resistance values obtained when the circuit breaker is closed may be lower than when it is open due to the presence of the closed contacts, which will affect the accuracy of the measurement.
  • Therefore, it is recommended to perform the insulation resistance test when the circuit breaker is open if possible.