一、概述在发电机直流泄漏试验时,常发现:三相电流互差较大;电流随时延而增长;电流随电压升高不成比例,且有突变、冲击摆动、画伏安曲线有明显拐点等异常现象。这就表明,该相之某一线棒内,存在有局部绝缘缺陷。这时,升压至耐压值尚未发现缺陷,即耐压算是通过了,但存在着隐患。为了保证电机安全运行,最好能挖出隐患 I. Overview In the generator DC leakage test, it is often found that: the mutual difference of three-phase current is large; the current increases with time delay; current is not proportional to voltage increase, and there is a sudden change and impact swing. And other anomalies. This shows that the phase of a certain bar, there is a partial insulation defects. At this time, the voltage has been elevated to withstand the pressure has not found a flaw, that is, through the pressure, but there are hidden dangers. In order to ensure the safe operation of the motor, it is best to dig out the hidden dangers