1. Packet-like charge formation in cable insulating materials at polarity reversal
- Author
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Hiroaki Miyake, Kikuchi Saki, Hiroki Mori, Yukihiro Yagi, Toshiyuki Fujitomi, Tsuyoshi Kato, and Yasuhiro Tanaka
- Subjects
010302 applied physics ,Polarity reversal ,Voltage polarity ,Materials science ,business.industry ,System of measurement ,020208 electrical & electronic engineering ,Electrical engineering ,Charge (physics) ,02 engineering and technology ,Polyethylene ,01 natural sciences ,Space charge ,Stress (mechanics) ,chemistry.chemical_compound ,chemistry ,Electric field ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Composite material ,business - Abstract
Investigation of space charge accumulation processes in a chemically cross-linked polyethylene for ac usage (XLPE) and a modified XLPE for dc usage (DC-XLPE) at voltage polarity reversal was carried out using pulsed electro-acoustic (PEA) measurement system. We found that a huge amount of so called packet-like charge, some of which partially increased the electric field in the material to more than twice of the average applied stress, generated in XLPE at the polarity reversal of DC stress. It enhanced the electric stress locally in the sample by almost twice of the applied average stress. On the other hand, we also found that the packet-like charge was not observed in DC-XLPE under the same experimental condition.
- Published
- 2017
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