Treeing and tracking observation on the surface of transmission line insulator for solving line-to- ground fault in DC high voltage application

Yee, Lu Huan (2023) Treeing and tracking observation on the surface of transmission line insulator for solving line-to- ground fault in DC high voltage application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Throughout the proposal of this final year project is regarding on the photographic observation for electrical treeing and tracking observation on the surface of transmission line insulator for solving line-to-ground fault in DC high voltage application via high-speed camera. Since formation of electrical treeing and contamination of tracking may lead to breakdown in high voltage system. The observation of the existence of electrical treeing may provide insight into how to diminish the risk of a breakdown occurring in a high voltage system of the line to ground fault as a precaution to prevent the breakdown triggered phenomenon in a high voltage system. The main purpose of this final year project is to investigate the propagation progress of electrical treeing and tracking on the surface of the ceramic insulator by using the combination of electric field measurement and high-speed photographic camera. This project was conducted in Universiti Institut Voltan Dan Arus Tinggi (IVAT) lab from Universiti Teknologi Malaysia, Skudai, Malaysia. A ceramic insulator KN120 used to see the formation of electric treeing and tracking by applying high voltage DC ranging from 30 to 50 kV. For the purpose of photographic and electric field observation and measurement, this project used Choronos 1.4 High speed camera and broadband electric field measurement. The resolution of high-speed camera was set to 1000 frame per second (fps) within the duration of 2 seconds. Electrical breakdown voltage was recorded by using high defination of transient recorder (Lecroy HDO4024) with the resolution ranging from 10 to 20 MS/s for 2 seconds duration. The results of this project comprises three important findings: a) When the DC voltage exceed up to 20 kV, treeing and tracking start forming at the bottom of the insulator that being terminated by HV terminal (+); b) Treeing and tracking appeared as train pulses ranging from 9 to 10 MHz between the two peaks (as summarized in Table 4.1); c) Peak voltage due to treeing and tracking variation associated in DC input and not consistence or not uniform range (as summarized in Table 4.2).

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