Very Low Frequency (VLF) Testing of Medium Voltage Motor and Transformer Circuits

Published Jun 23rd, 2021 IRMC 2021, Wayne Johnson

  • A test has been developed that allows evaluation of medium voltage motors (and transformers) without disconnecting them from their cables
  • The test provides better understanding of insulation degradation than dc testing and does not adversely affect the remaining life of old cable insulation

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