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Determining the Repeatability of Acoustic Emission Generated by the Hsu-Nielsen Calibrating Source

Boczar T., Lorenc M.

Molecular and Quantum Acoustics

2004

Vol. 25

177-192

This paper characterizes the idea of calibrating measurement paths, which make the measurement of the acoustic emission (AE ) pulses generated by partial discharges (PDs) in insulation of power appliances possible, by using the Hsu-Nielsen method. It also presents the results of the analyses done in the time and frequency domains of the measured AE pulses generated by the Hsu-Nielsen calibrating source. The measurement and analysis of the AE pulses were performed on the lid of the distributive transformer tub, for various distances between the source of calibrating signals and a measurement transducer in the range from 2.5 to 10 cm. The analysis of the results obtained was carried out based on a series of selected descriptors characterizing the AE signals measured, separately for the time and frequency domains. Moreover, the paper presents the results of parametric and non-parametric tests of goodness of fit, which were carried out to determine the probability distribution of the AE pulses measured and to examine the repeatability of the frequency analysis results obtained for a given distance between the transducer and the source of calibrating signals. Statistical analyses were carried out based on the values of three descriptors: shape coefficient, peak coefficient and median frequency, which make it possible to identify basic PD forms occurring in insulation oil.