35kV单母线分段变电站母线故障的保护分析与改进  

Analysis and Improvement for the Bus Failure Protection of 35 kV Sectionalized Single-Bus Substation

作　　者：陈锡磊 叶汉铮 徐文琴 CHEN Xi-lei;YE Han-zheng;XU Wen-qin(State Grid Zhejiang Cixi Power Supply Co.,Ltd,Cixi 315300,China)

机构地区：[1]国网浙江慈溪市供电有限公司,浙江慈溪315300

出　　处：《电工电气》2023年第7期33-36,共4页Electrotechnics Electric

摘　　要：针对一起35kV单母线分段变电站35kV母线故障时导致的全站停电事故,分析了事故中各继电保护和备自投装置的动作情况,明确了变电站全停的原因。分析结果显示,在目前的继电保护配置方式下,35kV母线故障时只能由线路对侧变电站的线路保护动作切除故障,本站母线设备将遭受多次短路电流的冲击,并最终导致全站停电。根据单母线分段母线故障的特点,提出了3种不同的继电保护改进方案,能够最大程度地避免全站停电,提高终端变电站的供电可靠性。The paper analyzes the action behaviors of relay protection and backup power automatic switch and nails down causes of this blackout based on a 35kV sectionalized single-bus substation power outage accident caused by the 35kV bus failure.The analysis shows that the present relay protection configure scheme can cut off failures through the opposite side substation when the 35kV bus fault happens,while the short-circuit current can surge bus equipments several times,leading to the final substation power outage accident.Three relay protection improved schemes are proposed according to the characteristics of bus failures of sectionalized single-bus.They can avoid substation power outage to the greatest extent and increase the power supply reliability of terminal substations.

关 键 词：单母线分段 母线故障 全站停电 改进方案 

分 类 号：TM77[电气工程—电力系统及自动化]