距离保护应用于共相并联电缆的适用性分析

廖 星; 冯玉雷; 李 健; 罗楚军; 冉启胜; 张 哲

引用本文:	廖星,冯玉雷,李健,等.距离保护应用于共相并联电缆的适用性分析[J].电力系统保护与控制,2021,49(1):98-105.
	LIAO Xing,FENG Yulei,LI Jian,et al.Applicability analysis of distance protection used in common-phase parallel cables[J].Power System Protection and Control,2021,49(1):98-105

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距离保护应用于共相并联电缆的适用性分析
廖星，冯玉雷，李健，罗楚军，冉启胜，张哲
(1.中国电力工程顾问集团中南电力设计院有限公司, 湖北武汉 430071； 2.强电磁工程与新技术国家重点实验室(华中科技大学)，湖北武汉 430074)

摘要:

为研究共相并联电缆特殊结构对距离保护的影响，以双回并联电缆为例，建立了其内部短路的各序等值模型，推导出测量阻抗的解析表达式。在此基础上，分析了影响距离保护动作性能的主要因素，给出了距离保护I段最小保护范围和区内故障最大测量阻抗计算方法。通过数字仿真，验证了分析结论的正确性。研究表明，共相并联电缆的特殊结构，会导致接地阻抗继电器和相间阻抗继电器测量阻抗增大，造成距离I段保护范围缩减，并降低距离II段的灵敏度，在相关保护整定计算中需予以重视，以保证电缆运行安全。

关键词: 共相并联电缆故障等值模型距离保护测量阻抗应用建议

DOI：DOI: 10.19783/j.cnki.pspc.200269

分类号:

基金项目:国家重点研发计划项目资助(2016YFB0900600)

Applicability analysis of distance protection used in common-phase parallel cables

LIAO Xing, FENG Yulei, LI Jian, LUO Chujun, RAN Qisheng, ZHANG Zhe

(1. Central Southern China Electric Power Design Institute of China Power Engineering Consulting Group, Wuhan 430071, China; 2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract:

To analyze the influence of the special structure of common-phase parallel cables on distance protection, the sequence equivalent model of double-circuit parallel cable is established and the analytical expressions of the measured impedance are derived. The main factors affecting the performance of distance protection are analyzed, and the calculation methods of the minimum range of first-zone distance protection and maximum measured impedance are given. The correctness of the analysis conclusion is verified by digital simulation. Results show that the measured impedance of grounding impedance relays and phase-to-phase impedance relays will increase because of the special structure of common-phase parallel cables. This will reduce the protection range of first-zone distance protection and the sensitivity of second-zone distance protection. This needs attention in the calculation of relevant protection settings to ensure the safety of cables. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900600).

Key words: common-phase parallel cables fault equivalence model distance protection measured impedance application suggestions

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