ケーブル直結端末部の絶縁劣化診断法の研究

概要

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Recently, power failure caused by partial discharge (PD) occurred at the cable joint of 22kV network in a substation, because insulation deterioration diagnosis technology in electric power systems has not been established yet. A prediction of dielectric breakdown by detection of PD is one of the important problems to establish insulation deterioration diagnosis in electric power systems. Therefore we carried out experiments for the purpose of detection of PD in di-cumyl peroxide (DCP) rubber used as an insulation material in electric power systems. The DCP rubber used in this experiment is the same material for insulation of actual cable splicing of the 22kV network. In this research, relation between deterioration state of cable joint and partial discharge was investigated, and a deterioration forecast diagnosis equipment by detecting partial discharge using acoustic emission sensors was built. The equipment is simple and easy to operate for detecting the partial discharge using AE sensor. As for this equipment, it is possible to evaluate a deterioration position, but a deterioration judgment criterion of cable joint has not been established yet. In this paper, the evaluation technique and the deterioration criterion are discussed.
宮崎大学の論文
2007-08-30