Indonesian Journal of Electrical Engineering and Computer Science Vol. 8, No. 1, October 2017, pp. 199 ~ 205 DOI: 10.11591/ijeecs.v8.i1.pp199-205  199 Received June 6, 2017; Revised August 16, 2017; Accepted September 4, 2017 Transmission Line Fault Detection: A Review Hui Hwang Goh* 1 , Sy yi, Sim 2 , Asad Shaykh 3 , Md.Humayun Kabir 4 , Chin Wan Ling 5 , Qing Shi Chua 6 , Kai Chen Goh 7 1,3,4,5,6 Department of Electrical Engineering, Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia 2 Department of Electrical Engineering Technology, Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia 7 Department of Construction Management, Faculty of Technology Management and Business, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia *Corresponding author, e-mail: hhgoh@uthm.edu.my Abstract Transmission line is the most important part of the power system. Transmission lines a principal amount of power. The requirement of power and its allegiance has grown up exponentially over the modern era, and the major role of a transmission line is to transmit electric power from the source area to the distribution network. The exploded between limited production, and a tremendous claim has grown the focus on minimizing power losses. Losses like transmission loss and also conjecture factors as like as physical losses to various technical losses, Another thing is the primary factor it has a reactive power and voltage deviation are momentous in the long-range transmission power line. In essentially, fault analysis is a very focusing issue in power system engineering to clear fault in short time and re-establish power system as quickly as possible on very minimum interruption. However, the fault detection that interrupts the transmission line is itself challenging task to investigate fault as well as improving the reliability of the system. The transmission line is susceptible given all parameters that connect the whole power system. This paper presents a review of transmission line fault detection. Keywords: Transformers, Transmission line, Fault in transmission line, Fault location techniques, Traveling wave method Copyright © 2017 Institute of Advanced Engineering and Science. All rights reserved. 1. Introduction Regarding the distribution system, transmission lines perform the most important part that is to transfer electric power from the generating station to load centres. Since the development of the distribution and transmission system, power system engineers have been an object for locating and detecting faults. As long as the fault detected in short duration, it provides a good service for protecting the apparatus as well as an open way for disconnecting the part where this incident happened at fault, and with the help of this, it gives safe way to the system from any damages. So it is needed to detect the fault otherwise due to fault it causes any disturbance which further tough time to the interconnected system that based on limitations. The structure of the transmission line constructed to investigate the location of the fault and can give separation only the part where the fault occurs. Stimulating method help in identify and isolate the fault in short period. A stable voltage can be achieved by the use of a series capacitor achieved. Series capacitors line inductance can be reduced by (   ) [1] along the line. If the line current leads the voltage, mean voltage increase. On the other side, there could be a voltage drop if line voltage is lagging by the line current. In this outlook, the voltage that has been boosted up and the voltage dropped decreased by the series capacitor as if the line inductance is smaller for the series recompensed line as associated with the unpaid line. Suppose when more than two conductors develop contact each other or with the contact take place on the ground to 3 phase systems that are considered at fault which could be a balanced fault or unbalanced fault [2]. Due to these faults stresses are produced in power system equipment that could damage the power system components [3-5]. So to avoid these harms and to make power quality better, it is essential to know the reasons of fault as well as the location of the transmission lines and solve it properly. The problem of finding the type of