大型汽轮发电机定子线棒高频分布参数的测量

为研究局部放电信号等高频信号在电机定子绕组中的传播特性，需要确定电机定子线棒的高频分布参数。该文提出了基于多导体传输线(MTL)理论的大型电机定子线棒高频分布参数的测量方法。给出了三种不同条件下的大型汽轮发电机定子线棒分布参数的测量结果，分别是：用铝薄纸裹住单根定子线棒的情况；把单根定子线棒放在电机槽里的情况：双根定子线棒放在电机槽里的情况。测试结果较好地解释了陡前沿脉冲信号在电机定子绕组槽部线棒中是以两种速度沿线棒传播的现象。

MEASUREMENT OF LARGE AC ELECTRICAL MACHINE STATOR WINDINGS PARAMETERS AT HIGH FREQUENCY

To analyze the propagation of high frequency signals,such as partial discharge. pulse of PWM inverters in stator windings of electric machines,it is necessary to determine the stator windings parameters at high frequency.This paper describes an experimental method for measuring the stator windings parameters of AC large electrical machine at high frequency.The method is based on the theory of multi conductor transmission line (MTL).The experimental results of large turbine generator stator windings in three condition are given:single bar wrapped in aluminum foil without iron core;single bar in an iron core slot;two bars in an iron core slot.Results for the double bars in the slot show that a steep-fronted pulse propagates in stator slot bars of turbine generator with two modes.