韩晋,徐光学,裘愉涛,谢思先,孙艳,关继勇,朱志勇
HAN Jin,XU Guangxue,QIU Yutao,XIE Sixian,SUN Yan,GUAN Jiyong,ZHU Zhiyong

• 1:南京电研电力自动化股份有限公司
• 2:国网浙江省电力有限公司
• 3:特变电工衡阳变压器有限公司

摘要(Abstract)：

为解决配电网多端线路差动保护应用中存在的保护灵敏度下降、无电压条件下无法补偿电容电流、区外故障近端CT（电流互感器）易饱和等问题，提出一种基于电流故障分量阿尔法平面的差动保护方法。该方法参考阿尔法平面保护方法，以电流故障分量矢量信息建立分析区域，通过动态分区实现区内外故障判别。对该方法的抗电容电流、抗CT饱和能力进行理论分析，并在不同故障类型、电容电流及CT饱和工况下进行仿真验证。结果表明，该算法灵敏度高、判别裕度大，不受负荷电流影响，无需额外的电容电流补偿元件与CT饱和辨别元件，适合应用于配电网。
To address the challenges in differential protection applications for multi-terminal lines in distribution networks, such as reduced sensitivity, the inability to compensate for capacitive current under no-voltage conditions, and susceptibility of current transformers(CTs) to saturation during external faults, a differential protection method based on the alpha plane of current fault components is proposed. This method builds on the alpha-plane protection principle, constructs an analysis region using vector information of current fault components, and discriminates between internal and external faults through dynamic partitioning. Theoretical analysis is conducted to evaluate the method's immunity to capacitive current and CT saturation, and simulation studies are performed under various fault types, capacitive current levels, and CT saturation conditions. The results indicate that the proposed method features high sensitivity and a wide discrimination margin, is unaffected by load current, and does not require additional capacitive current compensation devices or CT saturation identification units, making it suitable for application in distribution networks.

关键词(KeyWords)： 配电网;多端输电线路;差动保护;故障分量;阿尔法平面;相位差;电容电流;CT饱和
distribution network;multi-terminal transmission line;differential protection;fault component;alpha plane;phase difference;capacitive current;CT saturation

Abstract:

Keywords:

基金项目(Foundation): 智能电网国家科技重大专项（2025ZD0807400）

作者(Author): 韩晋,徐光学,裘愉涛,谢思先,孙艳,关继勇,朱志勇
HAN Jin,XU Guangxue,QIU Yutao,XIE Sixian,SUN Yan,GUAN Jiyong,ZHU Zhiyong

DOI: 10.19585/j.zjdl.202607003

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