| 引用本文: | 张佳敏,袁宇波,卜强生,宋 爽.非接触式TA二次回路多点接地检测方法[J].电力自动化设备,2014,34(10): |
| ZHANG Jiamin,YUAN Yubo,BU Qiangsheng,SONG Shuang.Contactless detection of multi-point grounding in CT secondary circuit[J].Electric Power Automation Equipment,2014,34(10): |
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| 摘要: |
| 针对电流互感器（TA）二次回路多点接地导致继电保护装置误动的情况，提出了一种非接触式电流回路多点接地检测方法。该方法在TA二次回路中施加变化的磁场，如果TA二次回路多点接地，则施加的磁场会在接地点与中性线形成的回路中感应出电流，电流越大，越能说明多点接地的存在。为了防止检测时感应电流过大导致继电保护误动，提出了频率辅助判据。实验结果验证了所提方法的正确性。 |
| 关键词: 继电保护 电流互感器 二次回路 接地 故障检测 磁场 感应电流 |
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| Contactless detection of multi-point grounding in CT secondary circuit |
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ZHANG Jiamin, YUAN Yubo, BU Qiangsheng, SONG Shuang
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State Grid Jiangsu Electric Power Research Institute Co.，Ltd.，Nanjing 211100，China
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| Abstract: |
| Since the multi-point grounding in the secondary circuit of CT（Current Transformer） may cause the misoperation of relay protections，a detection method without any contact is proposed for it，which exerts the varying magnetic field on the secondary-circuit of CT and detects the induced current. If multi-point grounding exists，the induced current will be detected in the neutral line between two grounding points，and the larger the current is，the more obviously the multi-point grounding exists. An auxiliary frequency criterion is proposed to prevent the misoperation of relay protections caused by the large inductive current. Experimental results verify the correctness of the proposed method. |
| Key words: relay protection current transformers secondary circuit electric grounding fault detection magnetic fields inductive currents |
