Transcription of TAN δ (DELTA) CABLE TESTING OVERVIEW AND …
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TAN δ (DELTA) CABLE TESTING OVERVIEW AND …
TAN ( delta ) CABLE TESTING OVERVIEW AND ANSWERS TO FREQUENTLY ASKED QUESTIONS What Is Tan , Or Tan delta ? Tan delta , also called Loss Angle or Dissipation Factor TESTING , is a diagnostic method of TESTING cables to determine the quality of the CABLE insulation. This is done to try to predict the remaining life expectancy and in order to prioritize CABLE replacement and/or injection. It is also useful for determining what other tests may be worthwhile. How Does It Work? If the insulation of a CABLE is free from defects, like water trees, electrical trees, moisture and air pockets, etc., the CABLE approaches the properties of a perfect capacitor. It is very similar to a parallel plate capacitor with the conductor and the neutral being the two plates separated by the insulation material.
How Is The Test Performed? The cable to be tested must be de-energized and each end isolated. Using a VLF AC Hipot, the test voltage is applied to the cable while the tan delta controller takes measurements.
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