摘要
为了简便、可靠地检测和定位交流电机定子铁心叠片的片间短路故障,缩短机组维修和停运时间,提出利用开口变压器法检测交流电机定子铁心故障的方法。首先推导定子铁心正常和叠片片间短路故障情况下开口变压器铁心的磁通特征,进一步得到开口变压器感应电压的表达式,预测了片间短路故障的感应电压特征。然后以一台QFSN-300-2型汽轮发电机定子作为研究对象,通过二维有限元电磁模型进行仿真验证,进一步在一台小型异步电机定子铁心上进行实验验证。仿真和实验结果表明:在定子铁心正常情况下,开口变压器线圈在定子铁心各槽的感应电压都很小;当定子铁心某槽发生片间短路时,开口变压器线圈在该槽的感应电压随之升高,并且感应电压的幅值随着故障位置和故障程度不同而有所差异,证明了开口变压器法可用于检测交流电机定子铁心叠片片间短路故障。
In order to detect and locate the inter-chip short-circuit fault of AC motor stator core lamina-tions simply and reliably,and shorten the maintenance and shutdown time of the unit,a method for de-tecting the fault of AC motor stator core by using the open transformer method was proposed.Firstly,the magnetic flux characteristics of the open-end transformer core under normal stator core and laminated in-ter-chip short-circuit fault were derived.The expression of the induced voltage of the open-end transform-er was further obtained,and the induced voltage characteristics of the inter-chip short-circuit fault were predicted.Then,a QFSN-300-2 type turbine generator stator was taken as the research object,and the simulation verification was carried out by the two-dimensional finite element electromagnetic model,and the experimental verification was further carried out on the stator core of a small asynchronous motor.The simulation and experimental results show that under the normal condition of the stator core,the in-duced voltage of the open transformer coil in each slot of the stator core is very small;when an inter-chip short circuit occurs in a slot of the stator core,the induced voltage of the open transformer coil in the slot increases,and the amplitude of the induced voltage varies with the fault location and fault degree.It is proved that the open transformer method can be used to detect the inter-chip short circuit fault of the sta-tor core of the AC motor.
作者
武玉才
张龙
白雨卉
马明晗
赵海森
许国瑞
WU Yucai;ZHANG Long;BAI Yuhui;MA Minghan;ZHAO Haisen;XU Guorui(Key Laboratory of Green and Efficient New Electrical Materials and Equipment in Hebei Province,North China Electric Power University,Baoding 071003,China;College of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2023年第12期21-30,共10页
Electric Machines and Control
基金
国家自然科学基金(52277048)
河北省自然科学基金(E2023502002)。
关键词
开口变压器法
交流电机
定子铁心
片间短路
感应电压
故障诊断
open transformer method
AC motor
stator core
inter-lamination short circuit
induced volt-age
fault diagnosis
