| 引用本文: | 陈琦,刘志仁,殷建荣,王永旭,唐治国,薛明军,周兆庆,陈宏岩,吴路明.工频磁场干扰识别及母线保护防误技术[J].电力自动化设备,2021,41(4): |
| CHEN Qi,LIU Zhiren,YIN Jianrong,WANG Yongxu,TANG Zhiguo,XUE Mingjun,ZHOU Zhaoqing,CHEN Hongyan,WU Luming.Identification of frequency magnetic field interference and technology to prevent misoperation of bus differential protection[J].Electric Power Automation Equipment,2021,41(4): |
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| 工频磁场干扰识别及母线保护防误技术 |
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陈琦1,2, 刘志仁3, 殷建荣4, 王永旭1,2, 唐治国1,2, 薛明军1,2, 周兆庆1,2, 陈宏岩1,2, 吴路明1,2
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1.国电南京自动化股份有限公司，江苏 南京 210003;2.南京国电南自电网自动化有限公司，江苏 南京 211153;3.国网江苏省电力有限公司无锡供电分公司，江苏 无锡 214026;4.江苏省宜兴中等专业学校，江苏 宜兴 214206
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| 摘要: |
| 分析工频磁场干扰对母线差动保护的影响，将各条支路上工频磁场干扰电流幅值和相位相似的特征与母线保护装置备用支路多的特点进行结合，通过母线保护装置的备用间隔的电流采样值特征识别工频磁场干扰并得到干扰值。计算补偿干扰电流后的差动电流，并在母线差动保护判据中增加补偿后差动电流相关的判据，有效防止发生工频磁场干扰时母线差动保护误动，提高了保护可靠性。仿真结果表明，所提算法能够准确有效地补偿工频磁场干扰，防止工频磁场干扰下母线差动保护误动，且不会影响区内故障下母线差动保护的性能。 |
| 关键词: 母线差动保护 电磁干扰 工频磁场 继电保护 |
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| 基金项目:中国电机工程学会青年人才托举工程项目(CSEE-YESS-2017) |
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| Identification of frequency magnetic field interference and technology to prevent misoperation of bus differential protection |
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CHEN Qi1,2, LIU Zhiren3, YIN Jianrong4, WANG Yongxu1,2, TANG Zhiguo1,2, XUE Mingjun1,2, ZHOU Zhaoqing1,2, CHEN Hongyan1,2, WU Luming1,2
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1.Guodian Nanjing Automation Co.,Ltd.,Nanjing 210003, China;2.Nanjing SAC Power Grid Automation Co.,Ltd.,Nanjing 211153, China;3.Wuxi Power Supply Company of State Grid Jiangsu Electric Power Co.,Ltd.,Wuxi 214026, China;4.Yixing Secondary Vocational School of Jiangsu Province, Yixing 214206, China
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| Abstract: |
| The influence of power frequency magnetic field interference on bus differential protection is analyzed, and according to the characteristic that amplitude and phase of power frequency magnetic field interference current in each branch are similar and the characteristic that the standby branches in bus protection device are multiple are combined, the power frequency magnetic field interference is identified and the interference value is obtained by judging the current characteristics of the standby interval of the bus protection device, then the differential current after compensating interference current is calculated, and the criterion of compensating differential current is added to the criterion of bus differential protection, which can effectively prevent the misoperation in the power frequency magnetic field interferes and improve the protection reliability. The simulative results show that the proposed algorithm can accurately and effectively compensate the interference of frequency magnetic field, avoid the misoperation of bus differential protection in power frequency magnetic field interference and has no influence on bus differential protection performance during short circuit faults. |
| Key words: bus differential protection electromagnetic interference frequency magnetic field relay protection |
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