汽轮发电机励磁绕组不同位置匝间短路对励磁磁动势的影响  

Influence on Field Magnetic Motive Force of Turbo-generator With Field Winding Inter-turn Short Circuits at Different Position

作　　者：侯纪勇[1] 李和明[1] 李俊卿[1] 王红宇[1] 胡笳 

机构地区：[1]华北电力大学电气与电子工程学院,北京市昌平区102206 [2]中国电力国际有限公司,北京市海淀区100080

出　　处：《中国电机工程学报》2011年第27期123-129,共7页Proceedings of the CSEE

基　　金：高等学校博士学科点专项科研基金资助项目(20060079007);河北省自然科学基金(08B005E2010001705)~~

摘　　要：为了研究汽轮发电机励磁绕组不同位置匝间短路故障时的磁场特性,将各个励磁线圈产生的矩形波磁动势进行傅里叶分解,利用傅里叶级数法获得了汽轮发电机励磁绕组正常和匝间短路时励磁磁动势表达式。据此得到了励磁绕组正常和不同位置短路3.75%时的励磁磁动势波形,结果表明:励磁绕组匝间短路时励磁磁动势畸变位置与短路所处空间位置角相对应;节距小的线圈比节距大的线圈短路引起的磁场不平衡程度明显;发生短路的励磁线圈节距越大,励磁磁动势基波幅值越小,从节距小的线圈到节距大的线圈分别短路时励磁磁动势出现的2次谐波幅值先变大后越小;实验分支电压频谱与励磁磁动势表达式的分析一致。In order to analyze the field feature of the field winding different position inter-turn short circuits, the expression for magnetic motive force （MMF） analysis of multi-polar turbo-generator with normal and inter-turn short circuits field windings was obtained based on each field coil＇s MMF Fourier decomposition. Based on the formula, the MMF waves of normal and field windings short circuits 3.75% at different positions were obtained, which shown that, firstly, there are one-to-one correspondence between distortion position of field MMF and space position angle of short circuits; secondly, the MMF unbalance degree, caused by the small pitch field coils short circuits, is more obvious than that caused by the big ones; thirdly, the fundamental field MMF is smaller when the more big pitch field coils short circuits; finally, the amplitude of 2nd harmonic MMF first increases and then reduces when the circuits short occurs from small pitch field coils to big pitch field coils in succession. The expression is consistent with the experiment branch voltage spectrum.

关 键 词：励磁磁动势 励磁绕组短路 不同位置故障 汽轮 发电机 

分 类 号：TM311[电气工程—电机]