Equivalent Conversion Method for the Breaking Capacity of Breaker Considering Excessive DC Component of the Short-circuit Current

被引：0

作者：

Zhang Y. ^{[1
]}

He J. ^{[2
]}

Li Y. ^{[1
]}

Yu Z. ^{[2
]}

Cui B. ^{[1
]}

Liu T. ^{[1
]}

Ye J. ^{[2
]}

Wang M. ^{[3
]}

Zhang W. ^{[4
]}

机构：

[1] State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute, Haidian District, Beijing

[2] State Grid Corporation of China, Xicheng District, Beijing

[3] Northwest Branch of the State Grid Corporation of China, Xi'an

[4] Beijing Kedong Electric Power Control System Co., Ltd., Haidian District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 23期

关键词：

Breaking capability; Conversion method; DC component; Short-circuit current; Time constant;

D O I：

10.13334/j.0258-8013.pcsee.200352

中图分类号：

学科分类号：

摘要：

The AC component and DC component of short-circuit current will affect the breaking capacity of breaker. At present, the calculation of short-circuit current mainly focuses on the AC component. The influence of DC component of short-circuit current exceeding the rated value on the breaking capacity of breaker was studied in this paper. Two equivalent evaluation principles were proposed to judge the breaking capacity of breaker, including energy equivalence and charge equivalence of breaking big half wave for the breaker. And three equivalent methods to calculate the breaking capacity of the AC component of the short-circuit current were put forward, which were the cumulative energy equivalent conversion method, the cumulative charge equivalent conversion method and the rectangular cumulative charge equivalent conversion method. The results verify the rationality of the proposed methods and the rectangular cumulative charge equivalent method is the most conservative one which is recommended to analyze the breaking capacity of breaker when the DC component of the actual power grid exceeds the standard, which provides a decision-making technique for power system planning, design and operation control. © 2020 Chin. Soc. for Elec. Eng.

引用

页码：7522 / 7529

页数：7

共 26 条

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