Method and system for measuring partial discharge

Abstract

In the measurement of partial discharge, a voltage detected by the antenna is input into a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with input impedance of the signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer, the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.

1 - 12 . (canceled)  
   
   
       13 . A method of measuring partial discharge, comprising the steps of: 
 detecting voltages of a conductor encased in a container together with an insulation material, at different locations respectively;    converting a waveform of an operating voltage, among said detected voltages at the one location, applied to said conductor by using a signal converter circuit;    inputting said converted operating voltage, via a delay circuit, into the trigger signal input terminal of a measuring instrument which displays input information on the screen;    inputting the other detected voltage at the other location, into the measurement signal input terminal of said measuring instrument; and    displaying voltage information inputted into said measurement signal input terminal on the screen of said measuring instrument using the operating voltage inputted into said trigger signal input terminal as a trigger.    
   
   
       14 . A partial discharge measuring system comprising: 
 a plurality of voltage detecting means for detecting voltages of a conductor encased in a container together with an insulation material, at different locations respectively;    a signal converter circuit for converting a waveform of an operating voltage, among said detected voltages at the one location, applied to said conductor;    the first inputting means for inputting said converted operating voltage, via a delay circuit, into the trigger signal input terminal of a measuring instrument which displays input information on the screen;    the second inputting means for inputting the other detected voltage at the other location, into the measurement signal input terminal of said measuring instrument; and    a displaying means for displaying voltage information inputted into said measurement signal input terminal on the screen of said measuring instrument using the operating voltage inputted into said trigger signal input terminal as a trigger.    
   
   
       15 . A partial discharge measuring system according to  claim 14 , 
 wherein said signal converter circuit comprising:    a comparator which responds to said operating voltage detected by said voltage detecting means and converts the waveform of said operating voltage to a square-wave;    a half-wave rectification circuit which half-wave rectifies the square-wave outputted by said comparator; and    an oscillation circuit which converts an output voltage of said half-wave rectification circuit into a voltage of higher frequency than that of said operating voltage.