Diagnosis and Analysis of a 110kV Oil-immersed Current Transformer with Partial Discharge Defects
编号:184 访问权限:公开 更新:2020-10-15 20:10:45 浏览:258次 张贴报告

报告开始:2020年11月04日 14:50(Asia/Shanghai)

报告时间:5min

所在会场:[G] Poster session [G4] Poster Session 4 and Poster Session 9

摘要
  More than 60% of oil-immersed current transformers are the vertical type in the Inner Mongolia Power Grid, which affects the operation stability of power system directly. This paper presents a diagnosing case of partial discharge defects of a 110kV vertical oil-immersed current transformer (VOCT). It is found that the Dissolved Gas Analysis (DGA) and dielectric loss of the VOCT exceeded warming thresholds. To explain the abnormal experimental results, byproducts in oil were examined and dielectric loss were re-measured under different voltage levels. In addition, the results of dielectric loss and grounding capacitance measurements indicated that the insulation of cable-paper tapes was good and the discharge was not attributed to moisture. Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometer (EDS) showed that the copper belts and cable tapes are neither oxidized nor aged. Based on the diagnosis and analysis, the causes of defects were cleared, and technical suggestions for instrument transformer were proposed.
 
关键词
Capacitance,Dielectric loss factor,DGA,Main capacitance screen,Primary winding,VOCT
报告人
Qiong Wang
the Inner Mongolia Electric Power Science & Research Institute, Inner Mongolia Grid

稿件作者
Qiong Wang the Inner Mongolia Electric Power Science & Research Institute, Inner Mongolia Grid
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重要日期
  • 会议日期

    11月02日

    2020

    11月04日

    2020

  • 10月27日 2020

    初稿截稿日期

  • 11月03日 2020

    报告提交截止日期

  • 11月04日 2020

    注册截止日期

  • 11月17日 2020

    终稿截稿日期

主办单位
IEEE IAS Student Chapter of Huazhong University of Science and Technology (HUST)
承办单位
Huazhong University of Science and Technology
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