Transcription of Field Testing of Medium-
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Field Testing of Medium-
Fall 2006 NETA WORLD FeatureField Testing of Medium- and High-Voltage Cablesby Vern Buchholz, about ten years ago, Testing the insulation on medium- and high-voltage power cable was straightforward. DC high potential tests were the industry norm. DC high potential Testing was developed in the days of oil-paper insulation, and because of the simple and easy-to-use equipment, continued to be used when extruded cables arrived. However, as extruded cables became widespread, it was noticed that although some cable systems passed the dc high potential test, they failed shortly after being put in service. Suspicions arose, particularly with aged polyethylene insulation, that the dc high potential test was somehow damaging the insulation.
www.netaworld.org Fall 2006 NETA WORLD Figure 2 — Ultrasonic detector used for locating serious PD improvements may occur as more data are collected, test and
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