华北电力大学电机学课件(全3) - 图文

绕组容量额定容量–传导容量效益系数kxy= ————= ——————————额定容量额定容量U1I1?U2I11kxy??1?U1I1kA绕组容量A?E1UAaI1N?kxySNAkxy?0.091?U1?E2axX实例: kA?1.1,20?10?200VA0.0909?2200?200VAUaxI?200?1?200VA?kxySNASNA?S电磁?S传导?kxySNA?S传导kxy越小, 电磁容量(绕组容量)kA越接近1, 越小, 传导容量越大,节材效果越明显。2.简化等值电路（推导过程不要求）??????kU2?E2?IZax同乘kU?kE?kIZAA2A2Aax?????????????????U2?E2?kAIZax?E1?E2?kAIZax①?①代入U得????1?I1ZAa?IZax?E1?E2?????U1??U2?I1ZAa?IZax(kA?1)???I??I1(kA?1)2??????I1ZAa?I1Zax(kA?1)?U1??U22?? ??U??I[Z?Z(k?1)]21AaaxA???I?Z ??U21kA??IZkA?ZAa?Zax(kA?1)12RkjXk'?U2?U1??ZL