用对偶镜像法计算大型电力变压器的漏电抗  

Calculation on leakage reactance of large power transformer by means of dual image current method

作　　者：杨平[1] 刘文里[1] 单薏[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150040

出　　处：《电机与控制学报》2007年第5期542-546,共5页Electric Machines and Control

摘　　要：采用镜像电流法对变压器铁心窗中的漏磁场进行了研究,获得了场点处向量磁位、漏电抗与最高镜像电流次数奇偶性的关系,提出了计算变压器漏电抗的对偶镜像法。用最高镜像次数为m的所有镜像电流及实际电流算得变压器的一个漏电抗,再用最高镜像次数和m相邻的所有镜像电流及实际电流算得变压器的另一个漏电抗,以这两个漏电抗的平均值近似变压器的实际漏电抗。用这种方法计算大型变压器的漏电抗,具有编程简单、计算时间短、相对误差小的优点。The leakage magnetic field distribution in the core aperture of transformer was researched with image current method and the relationships between vector magnetic potential as well as the leakage reactance of transformer and parity of the highest order of image current were obtained. According to the results, the dual image current method for calculating leakage reactance of power transformer was presented and demonstrated in detail. When the leakage reactance of transformer was calculated both by using the actual currents and all the image currents in which highest order was m, furthermore, the leakage reactance was calculated again both by using all those in which highest order bordered on m and the actual currents. The average value of these two leakage reactance was taken as actual value. The calculating method of transformer leakage reactance which employed dual image Current method has lots of advantages. Firstly, the calculating program is simple. Second, the calculating time is short and thirdly, the relative error is fewer. The leakage reactance of real power transformer was calculated, and the results show that the relative error is 1.29 per cent and only 83 seconds are consumed on the personal computer.

关 键 词：变压器 镜像法 漏电抗 对偶镜像法 

分 类 号：TM153[电气工程—电工理论与新技术]