Unbalanced Voltage Based Protection Method for Inter-turn Short-circuit Fault of Phase-controlled Reactor

被引：0
|
作者：
Chen H. [1 ]
Huang X. [1 ]
Zhang L. [1 ]
Zhou Q. [1 ]
Li C. [1 ]
机构：
[1] NR Electric Co., Ltd., Nanjing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2021年 / 45卷 / 24期
关键词：
Differential protection; Inter-turn short-circuit protection; Phase-controlled reactor; Trigger angle; Unbalanced voltage;
D O I：
10.7500/AEPS20201013005
中图分类号：
学科分类号：
摘要：
Phase-controlled reactor belongs to dry-type air-core reactor in structure. During operation, its current will change with phase control trigger angle, and its equivalent impedance also changes. The inter-turn short-circuit protection of the conventional dry-type air-core reactor is designed and implemented for the constant impedance reactor, which is not suitable for phase-controlled reactor. This paper presents an inter-turn short-circuit fault protection method for the phase-controlled reactor. First, according to the wiring and working characteristics of phase-controlled reactors, the unbalanced voltage between the two reactors is obtained. Then, the unbalanced current is calculated by sliding data window integration. Finally, based on the principle of differential protection, the judgment of inter-turn short-circuit fault is realized. The proposed method eliminates the influence of thyristor trigger angle on inter-turn short-circuit fault criterion. Real-time digital simulation results based on actual engineering parameters verify the effectiveness of the proposed method. © 2021 Automation of Electric Power Systems Press.
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页码：158 / 164
页数：6
相关论文
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