Patent ID: 9390067
Filing Date: 2016-07-12
CPC Classification: G01R,G06F

Claim Text:
1. A method for monitoring partial discharges in a high voltage cable, the method comprising: measuring electric signals of the cable for a time interval of at least one grid voltage period with a plurality of partial discharge sensors; filtering noise of the measured signal by calculating a Wavelet transform and identifying a partial discharge as a function of a statistical dispersion of components of said transform; determining in the filtered signal a start time of a pulse and at least one of the following parameters: phase angle over time in relation to the zero-crossing of a grid voltage, amplitude and an integral of the pulse of the partial discharge at the sensing point, identifying the cable where the partial discharge originates as a function of a highest amplitude of the signals detected by each trio of sensors positioned in accessories, and determining the parameter associated with a location of the partial discharge, taking into account differences of arrival times to the different sensors that have detected the partial discharge.