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Why Technicians Prefer Power Factor Testing for Insulator Diagnostics

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Power factor and direct current hipot tests are the most common methods of assessing the reliability of insulators. However, many prefer power factor testing because it can spot insulation defects that are not detectable by hipot testing.

Insulators in electrical facilities need to be thoroughly tested to ensure safe and reliable operation. When testing insulators, power factor measurement is the common method conducted because of its advantages over DC high potential testing. The advantage of power factor measurements overDC hipot testing is its ability to spot bad insulation even with the presence of a good layer. This reduces false tests that may cause problems in the future. Power factor testing also assesses the condition of the insulator by simulating the operating conditions of the tested component unlike hipot testing because is uses a high DC voltage. This results to longer testing time and the risk of false results. The power factor test also gives a more thorough analysis of the insulation condition while direct current hipot testing only determines if the insulation can withstand voltages slightly higher than its rating.

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