Mechanism and Countermeasures of Mal-operation of Converter Transformer Zero-sequence Overcurrent Protection Caused by Inrush Currents

被引：0
|
作者：
Weng H. [1 ]
Liu L. [1 ]
Lin X. [2 ]
Jin N. [2 ]
Li Z. [1 ]
Huang J. [1 ]
机构：
[1] Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station (China Three Gorges University), Yichang
[2] State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Converter transformer; Distribution of center-of-gravity; Inrush current; Phase space reconstruction; Zero-sequence overcurrent protection;
D O I：
10.7500/AEPS20180423003
中图分类号：
学科分类号：
摘要：
Aiming at the mal-operations of the zero-sequence overcurrent protection due to the energization of unloaded converter transformers and the removal of external fault in the HVDC transmission project, the variation characteristics of the two inrush currents and their influences on the zero-sequence current are analyzed. The phenomenon that the zero-sequence current is provided with quite high magnitude and decays slowly during the two inrush currents is simulated. The reason of the mal-operation of the zero-sequence overcurrent protection is revealed. Taking advantages of the phase space reconstruction technique, this paper proposes a novel blocking criterion of the zero-sequence overcurrent protection, which is based on the center-of-gravity amplitude of the phase space distribution of the zero-sequence current. The effectiveness of the proposed criterion is verified by means of simulation tests. © 2019 Automation of Electric Power Systems Press.
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收藏
页码：171 / 178
页数：7
相关论文
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