发电机出口电容器缺陷引起定子接地保护动作诊断方法

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发电机出口电容器缺陷引起定子接地保护动作诊断方法

更新时间：2025-08-13

- 发电机出口电容器缺陷引起定子接地保护动作诊断方法
- Automation of Electric Power Systems Vol. 38, Issue 24, Pages: 96-101(2014)
- 作者机构：
  
  广东电网公司电力科学研究院,广东省,广州市,510080
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014
- 稿件说明：
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TU Xiaotao. [J]. Automation of electric power systems, 2014, 38(24): 96-101.
DOI：

TU Xiaotao. [J]. Automation of electric power systems, 2014, 38(24): 96-101. DOI：

摘要

发电机出口电容器缺陷引起的定子接地保护动作难以通过检查绝缘电阻发现

故障位置不易查找。首先通过建立定子接地等效电路分析了其故障产生机理

然后利用定子相电压构成的三相参照系

对比分析了出口电容器缺陷和过渡电阻接地时的零序电压相位特征

并提出了相应的实用诊断新方法。该方法利用故障录波图判断零序电压在三相参照系的位置

并进一步结合发电机每相对地总电容及中性点接地电阻即可实现故障的快速诊断。最后

通过一起故障实例验证了所提方法的有效性。

Abstract

It is difficult to diagnose the stator ground fault caused by a faulty terminal capacitor with the help of detecting insulation resistance. The corresponding mechanism is analyzed first based on the equivalent circuit of stator ground fault. Three-phase reference composed of stator voltages is adopted to make a comparative analysis on the phase characteristics of zero sequence voltage

which can be used to discriminate the stator ground fault caused by a faulty terminal capacitor or grounding transient resistance. And a practical method is proposed based on the foregoing characteristics. In this approach

the position of zero sequence voltage in the three-phase reference can be judged by voltage waveforms from the wave-recording device. Furthermore

the winding capacitance to ground and grounding resistance of the neutral point should be utilized to realize rapid diagnosis. Finally

the effectiveness of the proposed approach is verified through a relevant fault example.

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