METHOD FOR RECOGNIZING PARTIAL DISCHARGES EMITTED INSIDE OR OUTSIDE AN ELECTRICAL APPARATUS

摘要

A method of recognizing partial discharges emitted inside or outside electrical equipment after at least one partial discharge activity has been detected Partial discharge patterns are recorded beforehand in a data base, each pattern being associated with the type of fault that generated it. A new partial discharge (Pd) pattern is acquired. The new partial discharge pattern is compared with discharge patterns that are already recorded in the data base The matching fault in the equipment is obtained by deduction, and the result is recorded in the data base.

主权项

1. A progressive method of recognizing partial discharges emitted inside or outside electrical equipment, wherein this recognition of partial discharges is shape recognition of the partial discharge patterns wherein after recording known partial discharge patterns in a data base with each pattern being associated with the type of fault that generated it, and after detecting at least one partial discharge activity, said method comprises the following steps:
acquiring a new partial discharge pattern. comparing said new partial discharge pattern with partial discharge patterns that are already recorded in the data base; after diagnosing the source of said partial discharges, obtaining the matching fault in the equipment; and recording the result thus obtained in the data base; wherein the method comprises acquiring color images obtained by measuring a series of these partial discharge patterns in phase and in amplitude and processing and transposing the color images into black and white images; and in that, after acquiring a new partial discharge pattern, said method includes sub-dividing the new partial discharge pattern into four equal portions, splitting it in two both horizontally and vertically and analysing the four zones obtained to allocate a category to the new pattern, and comparing said new partial discharge pattern with partial discharge patterns that are already recorded in the data base, the comparison being performed as a function of said category.