Study on Partial discharge (PD) behaviour for different type of insulation defects using pulse sequence analysis

Dzulkiffli, Najihah (2019) Study on Partial discharge (PD) behaviour for different type of insulation defects using pulse sequence analysis. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Partial discharge (PD) is a localized electrical discharge that only partially bridges the insulation between two conducting electrodes. PD acts as a major role in the acceleration of electrical aging and degradation of the insulating oil. PD is a well-accepted indicator of the degradation of electrical insulation, authorizing early detection of insulation faults. Measuring PD and interpreting its pattern helps to identify the different type of defects of high voltage equipment. Regarding to this work, pulse sequence analysis (PSA) has been performed using MATLAB software to identify the behavior of PD occurrence due to different defects such as corona in air, surface discharge and electrical treeing. The instantaneous voltage and voltage difference between two consecutive PD pulses are calculated and plotted. The results show that the three PD sources provide different pattern for the instantaneous voltage and voltage difference. The analysis of discharge sequences is suggested in PSA as an alternative with a more meaningful interpretation of PD phenomenon.

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