部分放電発生位相角分布パターンの認識による電気トリーの有無および形状の判定

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  • Detection of Electrical Tree Initiation and Assessment of Shape of the Developing Tree Using Pattern Recognition of Partial Discharge Occurrence Phase Distribution
  • ブブン ホウデン ハッセイ イソウカク ブンプ パターン ノ ニンシキ ニ ヨ

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We have already constructed a prototype of partial discharge (PD) measurement and degradation diagnosis system (PDM/ES-I) for insulating materials using a personal computer for insulating materials suffering PD. In this report, we applied PDM/ES-I to electrical tree degradation phenomena; we developed a system to detect when electrical tree is initiated and to assess the shape of the electrical tree by making use of the so-called Electrical Tree Detection System using Pattern Recognition, which is abbreviated as ETESPAR. We also developed a system to observe the treeing shape; The tree observation system (TOS) consisting of a microscope and an image processor can record temporal change of the shape of tree. Measurements of PD distribution patten were made. Using ETESPAR, we tried to determine the time of the tree initiation and to assess the developing tree shape for polyethylene sample with needle vs. plane electrode. The PD pattern measured at a given aging time was compared with five standard normalized PD patterns which had been registered in advance as five representative tree degradation stages. It has found ETESPAR allowed an exact determination of time when the tree was initiated. In addition, the result of the assessment by ETESPAR proved to agree well with the tree shape and degradation stage for the insulating material using pattern recognition of the PD pulse occurrence phase distribution.

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