Method and system for measuring partial discharge

A method of measuring partial discharge, comprising the steps of:

• detecting a voltage of a conductor encased in a container together with an insulation material by a voltage sensor;
• detecting an operating voltage supplied to said conductor based on said detected voltage of said conductor;
• transmitting the operation voltage detected by said voltage sensor to a measuring instrument through a signal converter circuit;
• compensating an original phase difference θ between the power supply voltage of said measuring instrument and said detected operating voltage which is transmitted into said measuring instrument through said signal converter circuit, and a phase shift Φ caused by said signal converter circuit;
• determining the phase of the time axis to be displayed on a screen of said measuring instrument based on said compensated operating voltage;
• displaying said determined phase of the time axis in the screen of said measuring instrument;
• displaying said detected partial discharge on said phase of the time axis in the screen of said measuring instrument;
• detecting said partial discharge through an electric cable which bypasses said signal converter circuit and reaches said measuring instrument;
• and
• displaying said partial discharge transmitted through said electric cable to said measuring instrument on said time axis on the screen of said measuring instrument which is compensated by said phase difference θ and said phase shift Φ.