内部部分放電試料の群小部分放電特性とその発生要因

書誌事項

タイトル別名
  • Swarming Pulsive Microdischarge Characteristics of Internal Void Specimen and the Factors Affecting its Occurrence
  • ナイブ ブブン ホウデン シリョウ ノ グンショウ ブブン ホウデン トクセイ

この論文をさがす

抄録

When partial discharge (PD) was measured with the conventional pulse method, it sometimes apparently disappeared. However, it turned out that the PD did not actually disappear, but only became a large number of very small partial discharges known as swarming pulsive microdischarges (SPMD). After this silent stage, detectable PD appeared again, leading to final breakdown. Since SPMD are missed in the conventional PD pulse detection method, it is necessary to pay careful attention to SPMD in terms of insulation diagnosis. We developed a personal-computer-aided partial discharge analyzing system for SPMD measurement. Based on the measurement with this system, a new PD parameter, the SPMD ratio, was introduced for quantitative analysis of SPMD. Using the developed system and the new parameter, partial discharge characteristics of the CIGRE method-II (CM-II) specimen and the modified one were studied to clarify the factors affecting the occurrence of SPMD. It became clear that the composition of the air in void is one of such factors, but it is not a decisive one, because SPMD, onece appeared, continued after the exchange of the gas in the gap with fresh air. Void surface roughness caused by the PD degradation is found to be one of main factors. Further the amplitude and the frequency of the applied voltage also affect the occurrence of SPMD. In the needle shape internal void specimen, SPMD appeared before the tree initiation, suggesting the close relation between the occurrence of SPMD and the PD degradation.

収録刊行物

被引用文献 (5)*注記

もっと見る

詳細情報

問題の指摘

ページトップへ