X射线激励下的油间隙放电现象.PDF

21 10 Vol. 21 No. 10 Oct. 2001 2001 10 Proceedings of the CSEE 2001 Chin. Soc.for Elec. Eng. (2001) 1001160 X 1 2 3 2 郭 琳, 黄兴泉 , 李成榕 , 张欲晓 ( 1. 郑州电力高等专科学校, 河南郑州 5000 ; 2. 河南电力试验研究所, 河南郑州 50052; 3. 华北电力大学( 北京) , 北京100085) PARTIAL DISCHARGE PHENOMENA WITH XRAY IRRADIATION IN OILGAP 1 2 3 2 GUO Lin , HUANG Xingquan , LI Chengrong , ZHANG Yuxiao ( 1. Zhengzhou Electric Pow er College, Zhengzhou 5000 , China; 2.Henan Electric Pow er Research Institute, Zhengzhou 50052, China; 3. North China Electric Pow er U niversity, Beijing 100085, China) ABSTRACT: With conventional ( PD) measurement technique, , t he tiny defects are difficult to be discovered in oil/ paper insula X tion system. T he partial discharge phenomena induced by Xray , X , / irradiation in transformer oilgap were investigated experimen , tally in this paper. It is found that PD activities in t he oilgap X w rapped by insulating materials are enhanced under Xray irra , diation, which could be associated with charge injection and , space charge distribution in the oil gap. Some free electrons , could come from the HV metal electrode by Photon effect at , , metal electrode surface w ith Xray irradiation, that is, free electrons in conductor could get energy from Xray photons to leave the metal surface. The oil gap formed betw een the elec : X ; ; trode and the w rapped cloths in the transformer model was : TM855 : A small so t hat the electrons escaped from the electrode surface w ere limited in the tiny oil gap. T herefore a charge accumula