小电流接地保护跳闸给故障检测与保护带来的机遇与挑战  

Opportunities and Challenges Brought by Tripping of Small Current Grounding Fault Protection to Fault Detection and Protection

作　　者：刘萃萃 薛永端[1] 王超 徐丙垠 LIU Cuicui;XUE Yongduan;WANG Chao;XU Bingyin(School of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong Province,China;Shandong Kehui Power Automation Co.,Ltd.,Zibo 255087,Shandong Province,China;Smart Grid Research Institate,Shandong University of Technology,Zibo 255049,Shandong Province,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东省青岛市266580 [2]山东科汇电力自动化股份有限公司,山东省淄博市255087 [3]山东理工大学智能电网研究院,山东省淄博市255049

出　　处：《全球能源互联网》2022年第3期213-220,共8页Journal of Global Energy Interconnection

基　　金：国家自然科学基金(52077221)。

摘　　要：小电流接地系统单相接地故障由“带故障运行”到“快速就近隔离”处理原则的转变,一方面,使小电流接地故障保护问题受到足够的重视,为配电网更加安全可靠地运行提供有力保障;另一方面,也对接地故障检测与保护技术的可靠性提出了更高要求。在小电流接地故障保护领域中,针对已有故障检测算法的适用性不广、高阻接地故障保护方法的可靠性不高、间歇性接地故障的划分不明晰与保护设计高难度,以及故障与系统扰动的区分复杂等问题进行了具体、深入的分析,明确了在现有保护方案的基础上直接投入跳闸功能的风险。分析及电网实际运行统计数据表明,小电流接地故障原有保护算法需进一步改进和完善,才能配合保护跳闸实现高可靠性的故障快速就近隔离。The transformation of the treatment principle of single-phase grounding fault in a small current grounding system from“operation with fault”to“rapid and nearby isolation”on the one hand,makes enough attention to the protection of small current grounding fault,and provides a strong guarantee for the more safe and reliable operation of distribution network.On the other hand,it also puts forward higher requirements for the reliability of ground fault detection and protection technology.In the field of small current grounding fault protection,the applicability of existing fault detection algorithms is not wide,the reliability of high resistance grounding fault protection methods is not high,the division of intermittent grounding faults is not clear and the protection design is difficult,and the distinction between faults and system disturbances is complex.The risk of directly putting the tripping function into operation based on the existing protection scheme is clarified.The analysis and the actual operation statistics of the power grid show that the original protection algorithm of small current grounding fault needs to be further improved and improved to cooperate with the protection tripping to realize highly reliable fault fast and nearby isolation.

关 键 词：小电流接地系统 接地处理原则 故障检测 高阻接地故障 间歇性接地故障 保护跳闸 

分 类 号：TM77[电气工程—电力系统及自动化]