Patent ID: 9645189
Date: 2017-05-09
CPC Classifications: G01R

Claim:
1. A partial discharge charge amount measuring method, comprising: applying a voltage from a voltage impressing device connected to an electric wire comprising a conductor and an insulating film covering a periphery of the conductor, thereby generating a partial discharge in the insulating film, the voltage being higher than a partial discharge inception voltage of the insulating film; continuously measuring and recording terminal voltages of a capacitor connected in series between the insulating film and a ground until a breakdown of the insulating film occurs by alternately operating at least two data loggers connected to the capacitor at intervals of a predetermined time; calculating an amount of electric charge discharged from the insulating film and remaining in the capacitor by a formula (1): where Q is the amount of electric charge discharged from the insulating film and remaining in the capacitor, Cd is capacitance of the capacitor and each of V calculating an accumulated discharge amount by accumulating the discharged amount of electric charge from the partial discharge of the insulating film occurs until the breakdown of the insulating film occurs.