水轮发电机局部放电在线监测方式的选择

局部放电在线监测的关键是能把局放信号与噪声信号区别开来,并由监测系统给出准确的处理建议。传感器是其关键技术之一,选择不同的传感器就选择了不同的测试系统。传感器安装在发电机中性点,其优点是对发电机运行的可靠性没有影响,但其所采集到的局部放电信号衰减严重;传感器安装在发电机高压侧,有利于局部放电信号的捕捉,但传感器本身的可靠性对发电机有一定影响。

On choice of couplers in partial discharge on-line monitoring of hydro-generator

There are several types of partial discharge monitoring system.How to tell the partial discharge signal from the noises is the key question in on-line monitoring.It is important to choose a kind of coupler,which means a certain system is chosen.The couplers are set at the neutral,which has no effects on operating reliability of the generator,but the acquired signals can be attenuated.If the couplers are set at the phase,witch advantages the useful signals but has some effects on operating reliability of the...