核电多相环形无刷励磁机转子绕组短路故障特征分析

doi:10.19595/j.cnki.1000-6753.tces.190036

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摘要多相环形无刷励磁机是大容量核电机组广泛采用的一种励磁机型,实现对其内部故障的可靠保护,对保障核电发电机组的安全运行具有重要意义。因多相环形无刷励磁机为转枢式结构,转子电枢绕组故障无法得到直接监测,但依据故障在定子励磁绕组中反映的特征来实现监测是一种有效的途径。通过理论分析正常运行及转子绕组短路时核电多相环形无刷励磁机的转子绕组与定子绕组产生的磁动势性质及其在气隙磁场中的相互作用,得到了两种运行情况下转子电枢电流和定子励磁电流的谐波特性。对某11相动模样机进行了正常运行和转子电枢绕组短路实验,通过快速傅里叶分析得到了实验电流的谐波特征,实验结果与理论分析相符。该方法适用于任意核电多相环形无刷励磁机的任意形式的转子绕组短路故障特征分析,可应用到核电多相环形无刷励磁机转子绕组短路故障诊断的进一步研究中。

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	郝亮亮
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	桂林

关键词 ：多相环形无刷励磁机, 转子电枢绕组, 短路故障, 谐波

Abstract：Multi-phase annular brushless exciter is widely used in large-capacity nuclear power units. The realization of reliable protection for internal faults of the exciters is of great significance to the safe operation of nuclear power generating units. Owing to the rotating armature structure of the multi-phase annular brushless exciter, the fault of rotor armature winding cannot be monitored directly. However, it is an effective way to monitor the fault according to the response characteristics of the fault in the stator field windings. In the nuclear power multi-phase annular brushless exciter, the magnetomotive force generated by the rotor winding and stator winding and their interaction in the air gap magnetic field are analyzed theoretically under normal operation and rotor winding short-circuit conditions. Accordingly, the harmonic characteristics of the stator field current and rotor armature current were obtained. Experiments under these two conditions were then carried out in armature windings on an 11 phase dynamic model machine. The harmonic characteristics of the experimental current were obtained by fast Fourier analysis. The experimental results were consistent with the theoretical analysis. This method is suitable for analyzing any type of rotor winding short-circuit fault characteristics of any nuclear power multi-phase annular brushless exciter, and can be applied to further study on short-circuit fault diagnosis of rotor windings.

Key words： Multi-phase annular brushless exciter rotor armature winding short-circuit fault harmonics

收稿日期: 2019-01-11 出版日期: 2020-03-27

PACS:

TM341

基金资助:中广核集团公司科技资助项目（百万千瓦级核电机组无刷励磁机故障特征分析和继电保护配置研究及实施）

通讯作者: 郝亮亮男,1985年生,副教授,博士生导师,研究方向为电力系统主设备故障分析及保护、直流输电控制与保护、励磁控制。E-mail: llhao@bjtu.edu.cn

作者简介: 李佳慧女,1994年生,硕士,研究方向为多相无刷励磁系统故障分析及保护。E-mail: 17121457@bjtu.edu.cn

引用本文:

郝亮亮, 李佳慧, 段贤稳, 郭立雄, 孙宇光, 桂林. 核电多相环形无刷励磁机转子绕组短路故障特征分析[J]. 电工技术学报, 2020, 35(6): 1251-1261. Hao Liangliang, Li Jiahui, Duan Xianwen, Guo Lixiong, Sun Yuguang, Gui Lin. Characteristic Analysis of Short-Circuit Fault in Rotor Winding of Nuclear Power Multi-Phase Annular Brushless Exciter. Transactions of China Electrotechnical Society, 2020, 35(6): 1251-1261.

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