Analysis Of Back-Flashover Rate For 132 KV Overhead Transmission Lines

Muhammad Sadiq, Suhaimi (2012) Analysis Of Back-Flashover Rate For 132 KV Overhead Transmission Lines. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Transmission line is a transmission system that delivers electric power supply from one place to another. In Malaysia, there are two types of transmission line which are single circuit line and double circuit line. Whenever lightning strikes the transmission line, there are possibilities of flashover to occur. The reason is, once lightning strike, the voltage that carried is forced down towards the insulator. The insulator prevents the overvoltage to flowing from the tower to the phase line. However, if this overvoltage equal or exceed the line Critical flashover (CFO) rate, flashover occurs. This phenomenon is known as backflash or back-flashover. During the phenomenon, the back flashover rate (BFR) had been calculated to do the analysis in improving the transmission line performance. The lowest value of BFR indicates that the line is well shielded and can sustain from the surge overvoltage and vice versa. There are several factors that influence the backflashover rate such as ground flash density, surge impedances, coupling factors, heights of the tower, horizontal separation of ground wires and CFO. Basically, BFR can be calculated by using 3 different methods; simplified, CIGRE and IEEE method. For this project, both simplified and CIGRE methods are used to determine the BFR. Programs are created based on these two methods using GUI, MATLAB software for user-friendly purpose. In the completion of this dissertation, several steps had been taken which are doing research and find information that related to the project through out resources of internet and books, analyze and compare the method of BFR calculation, design and build program by MATLAB (GUI), compare result from program with the result from book and do the conclusion & suggest future recommendation. For the result of this dissertation, it show that the programs that had been built are approved to be used.

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