Online surface condition monitoring system using time-frequency analysis technique on high voltage insulators

Zainal Abidin, Nur Qamarina and Abdullah, Abdul Rahim and Rahim, Nor Hidayah and NORDDIN, NURBAHIRAH and Aman, Aminudin (2013) Online surface condition monitoring system using time-frequency analysis technique on high voltage insulators. In: Power Engineering and Optimization Conference (PEOCO), 2013 IEEE 7th International, 3-4 June 2013, Langkawi, Malaysia.

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Insulations in high voltage engineering are a concern to users in terms of its performance, expected lifetime, and long-time reliability. Insulation failure can allow leakage current (LC) to flow and causes tracking and erosion as well as flashover. Tracking and erosion test complying with BS EN 60857-2007 are conducted to capture the set of leakage current (LC) patterns which are capacitive, resistive, and discharge activities. For verifying the performance of the insulators, an automated monitoring system is needed to reduce diagnostic time of the LC. Even though Fast Fourier Transform (FFT) gives useful information on the analysis of LC, it has limitation in nonstationary signal. Therefore, this research presents the analysis of time frequency distribution (TFD) which is spectrogram that represents the LC signals in the joint time frequency domains which provide temporal and spectral information. The results obtained from the developed monitoring system allow the user to identify leakage current performance in real time. The developed system has shown the capability in detecting the performance of insulating materials as well as identifying the characteristics of the surface discharges.

Item Type: Conference or Workshop Item (Speech)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Electrical Engineering > Department of Industrial Power
Depositing User: Dr Abdul Rahim Abdullah
Date Deposited: 20 Feb 2014 01:39
Last Modified: 28 May 2015 04:17
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