| 电力变压器离线局部放电测量试验中的容升现象分析 |
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| 引用本文： | 王烜,曹晓珑,李云阁,刘英.电力变压器离线局部放电测量试验中的容升现象分析[J].上海大学学报(英文版),2007,11(5):490-495. |
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| 作者姓名： | 王烜 曹晓珑 李云阁 刘英 |
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| 作者单位： | State Key Laboratory of Electrical Insulation for Power Equipment Xi'an Jiaotong University，State Key Laboratory of Electrical Insulation for Power Equipment，Xi'an Jiaotong University，State Key Laboratory of Electrical Insulation for Power Equipment，Xi'an Jiaotong University，State Key Laboratory of Electrical Insulation for Power Equipment，Xi'an Jiaotong University，Xi'an 710049，P.R.China High Voltage Department，China Electric Power Research Institute，Beijing 100085，P.R.China，Xi'an 710049，P.R.China，Xi'an 710049，P.R.China，Xi'an 710049，P.R.China |
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| 摘 要： | Partial discharge test on a transformer is carried out according to the items in IEC 60.During the test,unproved measuring system is calibrated by proved system at a voltage no less than 50% the rated testing voltage.The result is then extrapolated linearly,leading to an error related to the distribution of stray capacitance,which varies with the testing frequency,especially to large transformers.In this paper a factor,named the capacitive rise fact,is introduced to assess the rise.The factor can be adjusted to some extent by changing the reactance that is connected to the LV side of the testing circuit to lower the capacity of the power source.However,the factor changes when the voltage divider on the high voltage side is removed after the voltage ratio has been calculated,and a great error is resulted under unfavorable conditions.
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| 关 键 词： | 电力变压器 离线 局部放电 测量试验 容升现象分析 |
| 收稿时间： | 26 December 2005 |
| 修稿时间： | 2005-12-26 |
Analysis of capacitive voltage rise during off-line partial discharge tests on power transformers |
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| WANG Xuan,CAO Xiao-long,LI Yun-ge,LIU Ying.Analysis of capacitive voltage rise during off-line partial discharge tests on power transformers[J].Journal of Shanghai University(English Edition),2007,11(5):490-495. |
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| Authors: | WANG Xuan CAO Xiao-long LI Yun-ge LIU Ying |
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| Institution: | 1. State Key Laboratory of Electrical Insulation for Power Equipment, Xi'an Jiaotong University, Xi'an 710049, P. R. China;High Voltage Department, China Electric Power Research Institute, Beijing 100085, P. R. China
2. State Key Laboratory of Electrical Insulation for Power Equipment, Xi'an Jiaotong University, Xi'an 710049, P. R. China |
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| Abstract: | Partial discharge test on a transformer is carried out according to the items in IEC 60.During the test,unproved measuring system is calibrated by proved system at a voltage no less than 50% the rated testing voltage.The result is then extrapolated linearly,leading to an error related to the distribution of stray capacitance,which varies with the testing frequency,especially to large transformers.In this paper a factor,named the capacitive rise fact,is introduced to assess the rise.The factor can be adjusted to some extent by changing the reactance that is connected to the LV side of the testing circuit to lower the capacity of the power source.However,the factor changes when the voltage divider on the high voltage side is removed after the voltage ratio has been calculated,and a great error is resulted under unfavorable conditions. |
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| Keywords: | transformer stray capacitance partial discharge test |
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