| 摘要: |
| 分析了大型水轮发电机绕组基波电势的分布特征，推导了定子单相接地故障时的基波零序电压故障分量的相位与过渡电阻、故障位置的关系，提出了一种综合利用基波零序电压故障分量幅值和相位信息的定子单相接地故障定位新原理，并对该定位方法的误差进行了理论分析。理论分析和仿真测试结果表明：所提方法适用于大型水轮发电机，且不受中性点接地方式的影响，提高了故障定位的准确性。所提方法简单易行，仅需测量基波零序电压和相电压，无需增加额外设备。 |
| 关键词: 水轮发电机 定子单相接地 基波零序电压相位 故障定位 误差分析 |
| DOI：10.16081/j.issn.1006-6047.2017.02.020 |
| 分类号:TM77 |
| 基金项目:中央高校基本科研业务费专项资金资助项目(2016-MS 87) |
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| Stator single-phase grounding fault location for hydro-generator |
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JIA Wenchao, HUANG Shaofeng
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| The distribution characteristics of fundamental potential is analyzed for the windings of large hydro-generator, the relations between the fault component phase-angle of fundamental zero-sequence voltage and the transition resistance and between that phase-angle and the fault position are respectively deduced, a stator single-phase grounding fault location method applying the comprehensive information of the fault component amplitude and phase-angle of fundamental zero-sequence voltage is proposed, and its location error is theoretically analyzed. The results of theoretical analysis and simulation show that, immune to the neutral-point grounding mode and suitable for hydro-generator, the proposed method has higher fault location accuracy; being simple and practical, it needs only the fundamental zero-sequence voltage and phase voltage, no additional equipment is required. |
| Key words: hydro-generator stator single-phase grounding fault fundamental zero-sequence voltage phase electric fault location error analysis |
