同步发电机定子绕组匝间短路时转子动态电磁力计算

2018年7月电工技术学报Vol.33 No. 13 第33卷第13期TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Jul. 2018 DOI：10.19595/https://www.360docs.net/doc/985127234.html,ki.1000-6753.tces.170565

同步发电机定子绕组匝间短路时

转子动态电磁力计算

肖士勇1, 2戈宝军1陶大军1刘智慧2

（1. 哈尔滨理工大学电气与电子工程学院哈尔滨 150080 2. 哈尔滨理工大学荣成学院荣成 264300）摘要为准确地分析定子绕组匝间短路后同步发电机转子铁心电磁力的分布特点和变化规律，建立了同步发电机内部短路场路耦合模型，并结合麦克斯韦应力法，对一台1 400 MW半速汽轮发电机转子齿顶和齿壁动态电磁力进行了计算。经分析得到：在短路环电流的影响下，转子齿顶和齿壁局部电磁力突增，且最大电磁力集中在磁极两侧边缘处和槽口位置。随着短路匝数的增加，齿顶和齿壁局部电磁力的最大值小幅增加。该文为全面了解匝间短路对同步发电机的威胁和转子结构的优化设计提供了相应的理论依据。

关键词：同步发电机匝间短路动态电磁力场路耦合麦克斯韦应力法

中图分类号：TM341

Calculation of Rotor Dynamic Electromagnetic Force of Synchronous

Generator under the Stator Winding Interturn Short Circuit Fault

Xiao Shiyong1,2 Ge Baojun1 Tao Dajun1 Liu Zhihui2

（1. College of Electrical and Electronic Engineering Harbin University of Science and Technology

Harbin 150080 China

2. College of Rongcheng Harbin University of Science and Technology Rongcheng 264300 China）

Abstract In order to accurately analyze the distribution and variation of the electromagnetic force in the rotor of synchronous generators after the stator winding interturn fault, a field-circuit coupled model of synchronous generators with internal faults is built. A 1400 MW turbogenerator is taken as an example, and the dynamic electromagnetic force of the top and side walls of the rotor teeth is calculated by the Maxwell stress method. The calculation results show that, under the influence of the short-circuited loop current, the local electromagnetic force of the rotor tooth top and tooth side wall is sharply increased, and the maximum electromagnetic force is concentrated at both sides of the magnetic pole and the slot opening position. With the increase of the number of short-circuited coils, the maximum local electromagnetic force of the tooth top and the tooth side wall is increased slightly. The study in this paper provides the basis for comprehensive understanding the threat of the internal faults to synchronous generator and the optimization design of the rotor structure.

Keywords：Synchronous generator, interturn short circuit, dynamic electromagnetic force, field-circuit coupled, Maxwell stress method

0引言

同步发电机定子匝间短路会产生幅值极大的故障电流，如此大的故障电流不仅威胁电网的安全运行，还会使铁心承受破坏性极强的电磁力[1,2]。在电磁力的冲击下，电机振动加剧，甚至导致绕组绝缘进一步损坏和铁心龟裂等一系列严重故障，造成巨大的经济损失[3]。因此，准确地分析匝间短路故障下同步发电机的动态

国家自然科学基金资助项目（51407050）。

收稿日期 2017-05-05 改稿日期 2017-09-11 万方数据