中国电力2025，Vol.58Issue(5)：189-198,10.DOI:10.11930/j.issn.1004-9649.202404088
定子并联支路对主磁场不对称度的弱化效果评估
Evaluation of Weakening Effect of Stator Parallel Branch Circuit on Main Field Asymmetry
摘要
Abstract
The short circuit between turns of the rotor winding is a weak characteristic electrical fault of the turbine generator,which makes the fault detection difficult.This paper investigates the weakening effect of the circulating magnetic field inside the parallel branch of the stator winding of a turbine generator on the asymmetric magnetic field generated by the rotor winding turn-to-turn short-circuit,derives the expression of the excitation magnetic field under the fault condition,obtains the expression of the circulating current of the parallel branch of the stator winding and the expression of the magnetic field generated by the circulating current,and finds out the offsetting effect of the circulating field on the original asymmetric magnetic field.A 300MW steam turbine generator is used as an example to carry out finite element simulation,which proves the weakening effect of the parallel branch structure of the stator winding on the short-circuit fault characteristics of the rotor winding,and the research conclusion is helpful to analyze the external appearance and causes of the short-circuit fault characteristics between turns of the rotor winding,and also provides theoretical support for the feature extraction in the fault diagnosis stage.关键词
汽轮发电机/转子绕组匝间短路/诊断/并联支路环流法/不对称磁场Key words
turbine generator/rotor winding inter-turn short circuit/diagnosis/parallel branch loop method/asymmetric magnetic field引用本文复制引用
陈冰兵,武玉才,纪璇,朱新凯..定子并联支路对主磁场不对称度的弱化效果评估[J].中国电力,2025,58(5):189-198,10.基金项目
国家自然科学基金资助项目(深度调峰火电机组热致伸缩效应诱发转子绝缘劣化的演变机理及靶向防御,52277048 （）
新能源汇集站分布式调相机动态工况下转子复杂振动特性及轴系损伤机理,52307053). This work is supported by National Natural Science Foundation of China(Evolution Mechanism and Targeted Defense of Rotor Insulation Deterioration Induced by Thermal Expansion Effect of Thermal Power Units With Deep Peak Regulation,No.52277048 （）
Complex Rotor Vibration Characteristics and Shafting Damage Mechanisms of Distributed Condensers in New Energy Collection Station Under Dynamic Conditions,No.52307053). （）
