Magnetic Circuit Equivalent Model Construction and Inter-turn Protection for Shunt Reactor With Auxiliary Windings

被引：0
|
作者：
Zheng T. [1 ]
Tian H. [1 ]
Yang G. [2 ]
Zhang H. [2 ]
Zhan Z. [2 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
[2] China Electric Power Research Institute, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 05期
关键词：
inter-turn protection; phase difference; shunt reactor with auxiliary windings; three-segment magnetic circuit equivalent model; zero-sequence current ratio; zero-sequence equivalent circuit;
D O I：
10.13335/j.1000-3673.pst.2022.0272
中图分类号：
学科分类号：
摘要：
Shunt reactor with auxiliary windings as a new type of shunt reactor which can provide both the reactive power compensation for the long distance lines and the internal power for the switch stations. A number of air gaps on the core keep shunt reactor with auxiliary windings have a good linear characteristics while lead to the weak magnetic coupling between its power winding and auxiliary windings. In terms of this special structure, the existing air-core transformer model can only meet the simulation requirements of the external characteristics of shunt reactor with auxiliary windings system, but cannot reflect its internal electromagnetic coupling relationship. To solve this problem, through the analysis of its magnetic characteristics, this paper proposes the three-segment magnetic circuit equivalent model of the shunt reactor with auxiliary windings based on magnetic circuit decomposition method. This model can accurately simulate the electrical characteristics of the shunt reactor with auxiliary windings under the conditions of normal operation and various faults. Based on the proposed model and aiming at the problem of insufficient sensitivity of the protection against inter-turn fault of shunt reactor with auxiliary windings, a novel protection based on the zero-sequence current ratio and the phase difference is proposed. This scheme has high sensitivity and can identify the inner-turn faults of each winding without introducing the voltage and presetting any parameter. Finally, the correctness of the proposed three-segment magnetic circuit equivalent model and the novel protection scheme against inner-turn fault are verified by testing the physical model of shunt reactor with auxiliary windings. © 2023 Power System Technology Press. All rights reserved.
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页码：1837 / 1844
页数：7
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