Publication: Surface discharge identification due to leakage current on glass type outdoor insulator under ac applied voltage adopting uhf technique
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Date
2024-07
Authors
Nur Laili binti Suhaimi
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Abstract
Outdoor insulators are considered as one of the most significant parts of power system which can affect the overall performance of high-voltage (HV) transmission lines and substation. Their electrical performance is notably sensitive to environmental conditions, making them susceptible by the presence of contaminants such as dew, fog, or rain. High-voltage (HV) insulators are crucial for the successful operation of HV overhead transmission lines. A failure of insulator due to contamination can lead to flashover voltage, which will cause a power outage. Discovering the surface discharge (SD) existence at early stage may help in preventing the sudden failure of power equipment besides can increase the reliability of the HV overhead transmission line. Therefore, SD detection device is required to detect and monitor SD activity on the insulator. In this project, an Equivalent Salt Deposit Density is used as the contaminant to produce leakage current on glass insulator. A loop antenna is proposed over operating frequency from 10 MHz to 1.1 GHz. Thus, the objective of this project are to investigate the performance of developed antenna and to identify the capability of developed antenna to detect occurrence of SD on glass insulator. The SD detection experiment is conducted in the HV laboratory and the leakage current created on the glass insulator is used as its SD source. The Impedance Matching Circuit device is employed and SD pulse signal is simultaneously recorded using oscilloscope at applied voltage as the antenna captured SD spectra through signal analyzer.