A hipot test is a diagnostic method for determining the reliability of insulators in transformers, motors, cables and other electrical equipment. AC high potential test or VLF high potential tests are some of the hipot test conducted on components that have been on operation for a while. DC high potential testing is not conducted on used components because of the risk of damaging it even it is in good working condition.
DC high potential testing is usually done on new cables or electrical equipment. It is usually part of the quality control inspection in production lines. DC hipot is not recommended on used components because this test uses a very high voltage compared to AC or VLF hipot which can degrade a good part. DC high potential testing is also prone to flash overs and corona discharges especially if the test sample is incorrectly grounded or terminated. The very high voltage also increases the risk of ozone generation which can suffocate the user if the test is carried out in a poorly ventilated environment. Proper precautions should be practiced when conducting DC high potential testing to reduce the risk of harm and problems.
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