MULTIPLE METHOD FOR REMOVING NOISE INCLUDED IN PARTIAL DISCHARGE SIGNAL

摘要

A method of removing a hybrid noise from a partial discharge signal is provided to improve a noise suppression performance of a software filter by suppressing a noise while preventing a partial discharge signal from being affected. A partial discharge signal is received(S701) and an initial cleanliness of the partial discharge signal is calculated(S704). When a noise suppression scheme is not selected, the partial discharge signals are arranged in a 3D space having magnitude, phase, and period axes(S724) and the partial discharge signals are applied to various fuzzy allocation functions, such that a noise degree is obtained based on mean values for various magnitudes. The partial discharge signals are arranged into a number to phase space(S718) and the signals having smaller phases than a reference pulse number are removed(S720). The partial discharge signals are arranged into the 3D space and the noises are removed from the partial discharge signal according to a cohesion degree of the partial discharge signals. A maximum cleanliness value is compared with the cleanliness value of the partial discharge signal. When the maximum cleanliness value is greater than that of the partial discharge signal, an optimum noise removing scheme is applied to the partial discharge signals.