Partial discharge propagation and sensing in overhead power distribution lines

Khor, K 2010, Partial discharge propagation and sensing in overhead power distribution lines, Masters by Research, Electrical and Computer Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Partial discharge propagation and sensing in overhead power distribution lines
Author(s) Khor, K
Year 2010
Abstract Partial discharge phenomenon have been widely researched and commonly accepted as precursors to potential distribution line failures. The work in this thesis focuses on developing a low cost and market competitive online partial discharge monitoring system for distribution lines.

The work carried out in the early stages examines the sources of partial discharges such as damaged insulators and damaged conductors. Online and offline methods were evaluated for their suitability in detecting faults in distribution lines. Common online fault detection methods such as leakage current monitoring, acoustic detection, electromagnetic radiation sensing and infra-red imaging will be presented in the literature review.

To further understand the characteristics of the partial discharge signals, a test was carried out on an artificially polluted insulator covered in kaolin. The 22kV ceramic insulator was artificially polluted to produce partial discharge signals for data collection and further observation. Capacitive voltage dividers were used to step down the line voltage for safe monitoring on the oscilloscope throughout the entire test.

With a better understanding of the partial discharge signal, the information is then used in a computer simulation. The two simulation packages used for simulations are MATLAB and ATPDraw. As MATLAB was easier to control and allows consideration for skin effect, the final data presented was simulated using the MATLAB package.

The next stage of this thesis looks into the design of sensors capable of detecting partial discharge signals. The two sensors designed are the PCB Rogowski Coil and the capacitive coupler. Both sensors are able to detect high frequency signal but the capacitive coupler proved to be more reliable and provides more clearance from the line that is being monitored.

The final part of the thesis provides a glimpse of the proposed fault detection system. The sensors are placed on two points on the line and the data is fed into a data logging device. With the advances with the GPS system, the localization of the fault can be found easily.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Electrical and Computer Engineering
Keyword(s) Partial discharge
Rogowski coil
Distribution lines
Feeder lines
Online monitoring
Ceramic insulator
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Created: Fri, 10 Dec 2010, 15:33:36 EST
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