换流阀冷却系统异步电动机高阻故障识别与定位  

The stator high resistance fault identification and localization of asynchronous motors applied in valve cooling system

作　　者：董熙 江楠 张国华 高晟辅 刘东川 DONG Xi;JIANG Nan;ZHANG Guohua;GAO Shengfu;LIU Dongchuan(NR Electric Co.,Ltd,Nanjing 210000;Technical Center of State Grid Corporation of China,Beijing 100052)

机构地区：[1]南京南瑞继保电气有限公司,南京210000 [2]国家电网有限公司直流技术中心,北京100052

出　　处：《电气技术》2024年第11期15-21,共7页Electrical Engineering

基　　金：国家电网公司总部科技项目(5500-202249130A-1-1-ZN)。

摘　　要：异步电动机是阀冷系统中主循环泵的重要部件之一,提高其故障识别水平、迅速定位故障位置对于阀冷系统具有重要意义。本文采用对称向量法,提出基于电流不平衡度的定子高阻故障在线检测方法,并分析定子星接及角接条件下用于确定故障相别及故障严重程度的指标参数;通过合理设置电压监测位置,可以进一步缩小故障排查范围。最后,通过仿真测试和案例分析验证了所提方法的有效性。Asynchronous motor is one of the important components of the main pump in the valve cooling system.Improving the level of fault identification and instantly locating the fault point are of great value for the valve cooling system.In this paper,a method of online detection of stator high resistance fault based on current unbalance degree is proposed by means of symmetric vector method.Specifically,this paper analyzes the index parameters to determine the fault phase and fault severity under the conditions of stator star connection and delta connection.Furthermore,by setting the voltage monitoring location reasonably,the fault detection range can be further reduced.Finally,the effectiveness of the proposed method is verified through simulation test and a case analysis.

关 键 词：阀冷系统 主循环泵 异步电动机定子高阻故障 对称向量法 电流不平衡度 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM343