基于零序导纳的消弧线圈接地系统馈线单相断线故障保护方法  

Feeder Single-Phase Disconnection Fault Protection Method of Arc Suppression Coil Grounding System Based on Zero Sequence Admittance

作　　者：霍建彬 李巍 周歧林 白浩 李党 袁智勇 HUO Jianbin;LI Wei;ZHOU Qilin;BAI Hao;LI Dang;YUAN Zhiyong(Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 510620,China;Electric Power Research Institute,CSG,Guangzhou 510663,China)

机构地区：[1]广东电网有限责任公司广州供电局,广州510620 [2]南方电网科学研究院,广州510663

出　　处：《南方电网技术》2023年第5期117-124,共8页Southern Power System Technology

基　　金：国家重点研发计划资助项目(2017YFB0902902);中国南方电网有限责任公司科技项目(GZHKJXM20200081)。

摘　　要：配电网规模逐渐扩大且运行环境复杂多变,消弧线圈接地系统的单相断线故障愈发频繁,由于消弧线圈的补偿作用,发生断线故障时的电气量较弱,难以监测故障构建保护方案。针对消弧线圈系统馈线发生单相断线故障,提出了一种基于零序导纳的消弧线圈接地系统馈线单相断故障保护方法。首先分析线路首端零序电流和母线零序电压的特征,利用零序电流与零序电压之比得到零序导纳,指出非故障线路零序导纳相位在第一象限,而故障线路零序导纳相位在第二象限或第三象限。然后对消弧线圈过补偿情况的故障线路零序导纳进行改进,用线路零序导纳相位乘以对应的符号系数,扩大了故障线路与非故障线路零序导纳相位对的差异,基于零序导纳的相位特性建立了故障保护判据。最后通过PSCAD/EMTDC仿真,结果验证了所提方法的可靠性。As the scale of distribution network expands and the operation environment is complex and variable,the singlephase disconnection fault of arc suppression coil grounding system becomes more and more frequent.Due to the compensa⁃tion function of arc suppression coil,the electricity quantity is weak when the disconnection fault occurs,so it is difficult to monitor the fault and construct the protection scheme.Aiming at the single-phase disconnection fault of the feeders of arc sup⁃pression coil system,Based on zero sequence admittance,a single-phase fault protection method for feeder of arc suppression coil grounding system is proposed in this paper.Firstly,the characteristics of the zero sequence current at the beginning of the line and the zero sequence voltage of the busbar are analyzed,Using the ratio of zero sequence current to zero sequence voltage to obtain zero sequence admittance,it is pointed out that the zero sequence admittance phase of non fault lines is in the first quadrant,while the zero sequence admittance phase of fault lines is in the second or third quadrant.Then,the zero sequence admittance of the faulty line in the case of arc suppression coil overcompensation is improved by multiplying the zero sequence admittance phase of the line by the corresponding symbol coefficient,which expands the difference between the zero sequence admittance phase pairs of the faulty line and the non faulty line.Based on the phase characteristics of the zero sequence admittance,a fault protection criterion is established.Finally,the reliability of the proposed method is verified by PSCAD/EMTDC simulation results.

关 键 词：消弧线圈接地系统 单相断线故障 零序导纳 断线保护 

分 类 号：TM862[电气工程—高电压与绝缘技术]