自主脉冲标定式特高频局部放电带电检测相位同步方法

Phase synchronization based on independent reference pulse for online UHF PD detection

针对现有的特高频局部放电带电检测系统,提出一种基于特高频自主标定脉冲的相位同步方法。该方法使用一个同步电路,在工频信号上升沿过零点同步输出一时频特性固定的特高频时间标定信号,实现相位的同步。此信号与局部放电脉冲信号同时被局部放电特高频检测系统所采集,并以其时频参数为特征参量,采用聚类方法加以分类标记。利用局部放电特高频脉冲与其前后时间标定信号的时差便可计算其在工频信号的相角位置。实验结果验证了该方法的有效性和实用性。

A method of phase synchronization based on UHF（Ultra High Frequency） independent reference pulse is proposed for the existing UHF PD（Partial Discharge） detection system,which outputs a reference UHF pulse for phase synchronization by the synch circuit when the rising edge of power frequency signal passes zero point.The reference pulse is sampled together with PD pulses by the UHF PD detection system and distinguished from the PD pulses by the clustering method according to its time-frequency characteristic.The phase angle of PD pulse can be calculated according to the time difference between it and its neighboring reference pulse.Experiment verifies its effectiveness and practicality.