110kV终端变电站高压侧线路单相断相接地故障分析  

Analysis of Single-phase Line-broken and Grounding Fault in 110kV Terminal Substation's High-voltage Transmission Lines

作　　者：刘静莲 李云龙 LIU Jinglian;LI Yunlong(State Grid Shijiazhuang Gaocheng District Electric Power Supply Company,Shijiazhuang 052160,China;State Grid Liaocheng Power Supply Company,Liaocheng 252000,China)

机构地区：[1]国网河北省电力有限公司石家庄市藁城区供电分公司,河北石家庄052160 [2]国网山东省电力公司聊城供电公司,山东聊城252000

出　　处：《河北电力技术》2023年第4期79-84,共6页Hebei Electric Power

摘　　要：对110kV终端变电站高压侧输电线路发生的单相断相接地故障进行了建模分析及实例计算,研究了变压器三侧母线电压变化情况,针对变压器中性点两种运行方式分析了继电保护的动作行为。分析了系统中电阻分量会引起非故障相电压幅值偏差,同时根据电网实际参数的取值范围利用M语言对高压侧非故障相电压幅值偏差进行了计算,结合三维视图直观展示了电压偏差的变化趋势。有助于运行人员深入理解单相断相接地的故障机理,及时正确处理电网中发生的单相断相接地故障,确保电网安全稳定运行。The modeling analysis and practical calculation of single-phase line-broken and grounding faults in high-voltage transmission lines of the 110kV terminal substation are conducted.The voltage variation of the transformer's three sides bus is analyzed,and the relay protection action behavior is indicated due to the two operation modes of the transformer neutral point.It is determined that the resistance component in the system will cause voltage amplitude deviation in the non-fault phases.At the same time,the voltage amplitude deviation of the non-fault phase in the high-voltage side is calculated by using M language based on the value range of the actual parameters of the power grid,and the variation trend of the voltage deviation is displayed visually by three-dimensional view.This analysis aids operators in understanding the fault mechanism,timely and correctly dealing with faults in power grid promptly and correctly,and ensureing the safe and stable operation of the power grid.

关 键 词：终端变电站 输电线路 单相断相接地 电压变化 

分 类 号：TM744[电气工程—电力系统及自动化]