AUTHORS: Sobhy S. Dessouky, Sherif S. M. Ghoneim, Adel A. Elfaraskoury, Ramy N. R. Ghaly

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ABSTRACT: The Partial Discharge (PD) leads to a catastrophic failure of the transformer insulation. Determination of the PD source location is very necessary to start the maintenance procedures and isolate the reason for occurring PD. In this paper, PD location can be determined by measuring the acoustic signals that emit from the PD source. The proposed technique is based on the computation of the time difference of arrival (TDOA) between the signals. The location of PD can be accurately determined depends on the precision degree of the TDOA. An experimental work is built to develop a PD using point to plane gap configuration in the insulation oil that fills the Acrylic tank, in addition to four piezoelectric (PZT) sensors. These sensors are mounted on the Acrylic tank to receive the acoustic signals. Therefore, the sensors are coupling with acoustic PD detector and the PD detector outputs are applied to four-channel digital oscilloscope to measure the acoustic signals. The signal is converted to digit numbers to express the characteristic of the signal and then the time difference between the reference signal and the other signal is estimated using the cross correlation function. The proposed algorithm results demonstrate the ability of the algorithm to determine the PD location.

KEYWORDS: Partial discharge location, Acoustic, Time difference of arrival

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