| 引用本文: | 贾 超,胡志坚,方佳丞.多次同步异频测量法测量地网接地电阻[J].电力自动化设备,2015,35(4): |
| JIA Chao,HU Zhijian,FANG Jiacheng.Repeated synchronous non-power-frequency method for measuring grounding resistance of grounding grid[J].Electric Power Automation Equipment,2015,35(4): |
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| 摘要: |
| 使用异频法测量地网工频接地电阻时，电流极引线中的异频电流会在电压极引线上同时感应出感性电压和阻性电压。当测量回路周围存在中性点接地系统的平行架空线路时，架空线路与测量回路间的异频电磁耦合效应也会对测量结果产生影响。因此提出利用多次同步异频法测量大型地网接地电阻，该方法能够减少电压极引线上的异频感应电压对测量结果的影响。仿真结果表明多次同步异频法在各种不同的工况下均能得到准确的接地电阻值。 |
| 关键词: 大型地网 接地电阻 异频法 平行架空线路 多次同步测量 测量 |
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| 基金项目:国家教育部博士点基金资助项目（20110141110032）；西安交通大学电力设备电气绝缘国家重点实验室资助项目（EIPE13205） |
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| Repeated synchronous non-power-frequency method for measuring grounding resistance of grounding grid |
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JIA Chao1,2, HU Zhijian1,2, FANG Jiacheng1,2
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1.School of Electrical Engineering，Wuhan University，Wuhan 430072，China;2.State Key Laboratory of Electrical Insulation of Power Equipment，Xi’an Jiaotong University，Xi’an 710049，China
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| Abstract: |
| When the non-power-frequency method is applied to measure the grounding resistance of grounding grid，the induced reactive voltage and resistive voltage will be generated on the voltage electrode lead due to the non-power-frequency current in the current electrode lead. When there are parallel overhead lines of neutral grounding system around the measuring circuit，the measurement is influenced due to the electro-magnetic coupling effect between the overhead lines and the measuring circuit. The repeated synchronous non-power-frequency method is proposed to measure the grounding resistance of grounding grid，which reduces the influence of the induced non-power-frequency voltage of voltage electrode lead on the measurement. Simulative results show that the accurate measurement can be obtained under different operational conditions. |
| Key words: large grounding grid grounding resistance non-power-frequency method parallel overhead lines repeated synchronous measuring measurements |
