安康3号发电机局放在线监测系统

针对水轮发电机组结构及封闭式汇流母排走线方式的特点．选择发电机每相高压出现处为系统监测点，利用双安装传感器定向耦合实现干扰脉冲抑制。该系统在安康3F发电机主引出线上安装近、远端两路传感器（6只），耦合放电信号，经过信号的选通、滤波处理后进人监测系统，利用软件进行时延幅值判别．提取放电信号，并进行二维、三维谱图分析。通过对比分析现场监测到的放电信号与干扰信号在时域及幅值上的差别，验证其抗干扰方法的有效性

Partial Discharge Monitoring System on-Line in No.3 Generator of Ankang Hydropower Plant

In accordance with the construction of the water- turbine generating unit and the arrangement of the enclosed busbar of Ankang Hydropower Plant, the detecting point is chosen at the HV point at the phase of the generator, and the suppressing of the interference pulse is realized by means of directional coupling provided by the dual sensors installed. This system provides two lines of sensors （totaling 6 sensors） installed respectively at the near and far ends of the lead-our wire on No 3F generator, and the signals coupled by the sensors pass the filter in the signal processing unit before enter the monitoring system, and then they are acquired by the DAQ card in the computer. Finally, the PD signals are identified by using the ＂time-delay and pulse identification＂ anti-interference method, and this system also provides two-dimensional and three- dimensional analysis charts. Comparison and analysis are made on the differences between the PD signal and interference signal in terms of the time domain and amplitude to verify the effectiveness of the anti-interference method.