输电线路故障特性变化对继电保护性能的影响分析

Analysis of the Influence of Transmission Line Fault Characteristics on Relay Protection Performance

摘要

输电线路在长期运行过程中，受系统结构调整、负荷波动及外部环境变化等因素影响，其故障特性呈现出明显的动态变化特征。故障电流幅值、相位关系及阻抗特征的改变，直接影响继电保护装置的判据准确性与动作可靠性。围绕输电线路故障特性变化这一核心问题，从短路故障、接地故障及复杂运行条件下的综合特性入手，系统分析故障特性变化对不同类型继电保护性能的作用机理。通过梳理故障特性变化与保护灵敏度、选择性及稳定性之间的内在联系，揭示继电保护在复杂运行环境下面临的主要影响因素，为继电保护参数优化与运行性能提升提供理论依据。

Abstract

During long-term operation,transmission lines are influenced by factors such as power system structural adjustments,load fluctuations,and changes in the external environment,resulting in pronounced dynamic variations in fault characteristics.Alterations in fault current magnitude,phase relationships,and impedance characteristics directly affect the accuracy of protection criteria and the operational reliability of protective relays.Focusing on changes in transmission line fault characteristics,this study conducts a systematic analysis of the mechanisms by which such variations influence the performance of different types of protective relays,with emphasis on short-circuit faults,grounding faults,and comprehensive characteristics under complex operating conditions. By examining the intrinsic relationships between fault characteristic variations and protection sensitivity,selectivity,and stability,the major influencing factors faced by protective relays in complex operating environments are identified,providing a theoretical basis for the optimization of relay protection parameters and the enhancement of operational performance.

关键词

输电线路 / 故障特性变化 / 继电保护 / 保护性能 / 运行可靠性

Key words

transmission lines / fault characteristic variation / relay protection / protection performance / operational reliability

参考文献

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