Abstract
In this article, water tree degradation was detected and was located by applying the method entitled ‘Charge Radar method’. We studied the reduction of charge depending on the number of pulse voltages and the time interval between each pulse (5 µs or 1 s). It was revealed that the charge amount remained stable at 5 µs of the time interval and decayed significantly at 1 s of the time interval. This tendency suggested that the number of pulses did not provide a significant change to the reduction of charge amount. We investigated the space charge behavior of a thin crosslinked polyethylene (XLPE) film sample using the Pulse Electro‐Acoustic (PEA) method. The result suggested that the shallowly trapped charge was released shortly after the film sample had been short‐circuited, and the residual charge would stay for a long time depending on the depth of the trapping layer. It was also revealed that the residual charge was not disturbed by a short pulse voltage. It was suggested that the reduction in charge amount depended on the short‐circuiting time after polarization. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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