Research on Ultrasonic Locating of Partial Discharge in Power Transformer Based on Modified Multiple Signal Classification

The precise PD locating in power transformer can provide scientific information and guidance for its state maintenance. Due to the low resolution and estimation precision of MUSIC algorithm in PD locating used ultrasonic phased array, in this paper, a new locating method is proposed based on modified multiple signal classification (MMUSIC). Firstly, MMUSIC algorithm is used for direction of arrival estimating of PD source. Secondly, space locating of PD source is realized by crossover locating principle. Finally, the result of simulation based on 8 times 8 plane phased array model verifies the correctness of the new method, with the error less than 6 centimeters.