35 kV单母线分段变电站母线故障的保护分析与改进
陈锡磊,叶汉铮,徐文琴
(国网浙江慈溪市供电有限公司,浙江 慈溪 315300)
摘 要:针对一起 35 kV 单母线分段变电站 35 kV 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,35 kV 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。
关键词: 单母线分段;母线故障;全站停电;改进方案
中图分类号:TM77 文献标识码:B 文章编号:1007-3175(2023)07-0033-04
Analysis and Improvement for the Bus Failure Protection of 35 kV
Sectionalized Single-Bus Substation
CHEN Xi-lei, YE Han-zheng, XU Wen-qin
(State Grid Zhejiang Cixi Power Supply Co., Ltd, Cixi 315300, China)
Abstract: The paper analyzes the action behaviors of relay protection and backup power automatic switch and nails down causes of this blackout based on a 35 kV sectionalized single-bus substation power outage accident caused by the 35 kV bus failure. The analysis shows that the present relay protection configure scheme can cut off failures through the opposite side substation when the 35 kV 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.
Key words: sectionalized single-bus; bus failure; substation power outage; improved scheme
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