Design of Pole Detection Coils for Open-Circuit and Short-Circuit Faults in Multiphase Brushless Exciter
Sun Yuguang1, Du Wei1, Gui Lin1, Duan Xianwen2, Hao Liangliang3
1. State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing 100084 China; 2. China Nuclear Power Operations Co. Ltd Shenzhen 518172 China; 3. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China
Abstract：Multiphase brushless exciters have been widely used in large-capacity nuclear power units, but there is a lack of reliable measures for detection and protection of common faults at present. In this paper, a new type of fault detecting coil installed on the field pole of the brushless exciter, named as pole detection coil, was designed, and the connection ways of the detection coils was also studied. Characteristics of the phase current and armature reaction magnetic field were analyzed under normal operation and various fault conditions such as inter-turn short-circuit of field windings, open-circuit of diode, line break fault and internal short-circuit of armature windings in the multiphase brushless exciters with polygon connection armature. And then, the harmonic characteristics of the open-circuit voltage generated in the detection coil port were theoretically analyzed, and were verified by experiments on a model prototype of 11-phase brushless exciter. Theoretical analysis and experimental results show that, common faults in the multiphase brushless exciters could be detected and distinguished by the pole detection coil with the proposed connection ways, which provides a new idea to improve the operation safety and reliability of the multiphase brushless exciter.
孙宇光, 杜威, 桂林, 段贤稳, 郝亮亮. 用于多相无刷励磁机开路与短路故障检测的磁极探测线圈设计[J]. 电工技术学报, 2022, 37(14): 3542-3554.
Sun Yuguang, Du Wei, Gui Lin, Duan Xianwen, Hao Liangliang. Design of Pole Detection Coils for Open-Circuit and Short-Circuit Faults in Multiphase Brushless Exciter. Transactions of China Electrotechnical Society, 2022, 37(14): 3542-3554.
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