基于Tanimoto相似度的变压器零序差动保护约束方案

doi:10.11930/j.issn.1004-9649.202302076

中国电力 ›› 2023, Vol. 56 ›› Issue (8): 193-199.DOI: 10.11930/j.issn.1004-9649.202302076

基于Tanimoto相似度的变压器零序差动保护约束方案

朱佳¹, 王峰¹, 李一泉¹, 焦邵麟¹, 徐晓春², 赵青春²

1. 广东电网有限责任公司电力调度控制中心, 广东电网有限责任公司RTDS继电保护仿真重点实验室, 广东广州 510600;
2. 南京南瑞继保工程技术有限公司, 江苏南京 211102

收稿日期:2023-02-20 修回日期:2023-07-14 发布日期:2023-08-28
作者简介:朱佳（1990—），女，博士，从事电力系统继电保护研究，E-mail：zhujiaceee@qq.com;王峰（1982—），女，硕士，高级工程师，从事电力系统继电保护研究，E-mail：15153768@qq.com;李一泉（1979—），男，博士，高级工程师（教授级），从事电力系统继电保护相关研究，E-mail：1282520@qq.com
基金资助:
南方电网有限公司科技项目（广东目标网架8千安交流导线配套保护应用研究，0313002022030103JF00039）

Restraint Scheme of Transformer Zero Sequence Differential Protection Based on Tanimoto Similarity

ZHU Jia¹, WANG Feng¹, LI Yiquan¹, JIAO Shaolin¹, XU Xiaochun², ZHAO Qingchun²

1. Controlling and Dispatching Center of Guangdong Power Grid, Key Laboratory for Protective Relaying Real Time Digital Simulation of Guangdong Power Grid, Guangzhou 510600, China;
2. NR Engineering Co., Ltd., Nanjing 211102, China

Received:2023-02-20 Revised:2023-07-14 Published:2023-08-28
Supported by:
This work is supported by Science and Technology Project of China Southern Power Grid Co., Ltd. (Research on the Matching Protection of 8 kV AC Conductor of Guangdong Target Grid, 0313002022030103JF00039).

摘要/Abstract

摘要： 作为变压器重要保护之一的零序差动保护灵敏度高，抗干扰能力强，其保护判据的比较对象是三相进线侧相电流和得到的自产零序电流与中性线零序电流。三相进线电流互感器（current transformer，CT）和中性线电流互感器（neutral current transformer，NCT）饱和特性的差异会对零序电流的传变造成误差，传变后的零序电流波形会产生不同程度的畸变，从而导致虚假差流的产生，进而引起零序差动保护的误动作。针对该问题，在分析各种工况下经CT传变后两侧零序电流大小、相位特征的基础上，提出了一种基于Tanimoto相似度的变压器零序差动保护约束方案，并仿真验证了所提约束方案的有效性。

关键词: 变压器零序差动保护, CT饱和特性, 励磁涌流, Tanimoto相似度

Abstract: As one of the important transformer protections, zero sequence differential protection has the advantages of high sensitivity and strong anti-interference ability. The comparison object of its protection criterion is the self-generated zero sequence current and neutral zero sequence current obtained by the sum of three phase currents on the side of the three-phase incoming line. The difference of saturation characteristics between the three phase incoming-line side CT and the neutral side NCT will cause errors of zero sequence current transmission. The zero sequence current waveform after CT transmission will produce distortion in different degrees, which leads to the generation of false differential current, and then causes the misoperation of zero sequence differential protection. To solve this problem, on the basis of an analysis of the magnitude and phase characteristics of zero sequence current on both sides after CT transmission under various working conditions, a Tanimoto similarity-based constraint scheme for transformer zero-sequence differential protection is proposed, and the effectiveness of the proposed constraint scheme is verified by simulation.

Key words: transformer zero sequence differential protection, CT saturation characteristics, magnetizing inrush current, Tanimoto similarity

朱佳, 王峰, 李一泉, 焦邵麟, 徐晓春, 赵青春. 基于Tanimoto相似度的变压器零序差动保护约束方案[J]. 中国电力, 2023, 56(8): 193-199.

ZHU Jia, WANG Feng, LI Yiquan, JIAO Shaolin, XU Xiaochun, ZHAO Qingchun. Restraint Scheme of Transformer Zero Sequence Differential Protection Based on Tanimoto Similarity[J]. Electric Power, 2023, 56(8): 193-199.

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基于Tanimoto相似度的变压器零序差动保护约束方案

Restraint Scheme of Transformer Zero Sequence Differential Protection Based on Tanimoto Similarity

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基于Tanimoto相似度的变压器零序差动保护约束方案

Restraint Scheme of Transformer Zero Sequence Differential Protection Based on Tanimoto Similarity

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