基于零序电压差启动的10kV线路断线故障识别及保护方法  

Fault Identification and Protection Method of 10 kV Line Break Based on Zero Sequence Voltage Difference Starting

作　　者：刘昶 郭金坤 蒋濛 刘元莹 陈永明 侯超 LIU Chang;GUO Jinkun;JIANG Meng;LIU Yuanying;CHEN Yongming;HOU Chao(State Grid Jiangsu Electric Power Co.,Ltd.,Zhenjiang Power Supply Company,Zhenjiang 212000,China)

机构地区：[1]国网江苏省电力有限公司镇江供电分公司,江苏镇江212000

出　　处：《电工技术》2025年第2期114-119,共6页Electric Engineering

基　　金：国网江苏省电力有限公司科技项目(编号J2020151)。

摘　　要：随着配电线路的规模迅速扩大,断线故障时有发生,可能引发停电,威胁人身安全,甚至导致故障扩大,因此对断线故障的准确识别及切除至关重要。针对10 kV线路单相断线故障的快速识别及保护方法进行研究。首先采用对称分量法,针对断口处的边界电压、电流条件建立数学模型,分析断线故障时各电气量的变化特征,提出一种新型的小接地电流系统断线故障识别及保护方法。该方法以线路两侧零序电压差作为启动判据,以线路两侧各相电压差作为保护动作判据。建立了10 kV线路各种情况下的单相断线故障仿真模型,仿真结果验证了所提方法的可行性与有效性。The rapid expansion of the scale of distribution lines has led to occasional line failures,posing risks such as power outages,threaten personal safety,and even lead to the expansion of the fault.Hence,the precise identification and timely resolution of line failures are imperative.This paper delves into the investigation of a method for rapid identification and protection against single-phase break faults in 10 kV lines.Initially,a mathematical model based on the symmetric component method is formulated to delineate the boundary voltage and current conditions at the fracture point,enabling an analysis of the varying characteristics of each electrical parameter upon fault occurrence.Subsequently,a novel approach for identifying and safeguarding against faults in small ground current systems is introduced.This method leverages the zero-sequence voltage differential across both ends of the line as the initial criterion and the voltage differential across both ends of the line as the protective action criterion.Finally,a simulation model is constructed to simulate single-phase line break faults in 10 kV lines under diverse conditions.The simulation results verify the feasibility and effectiveness of the proposed method.

关 键 词：10 kV线路 小接地电流系统 单相断线故障 断线保护 零序电压 

分 类 号：TM46[电气工程—电器]