Enhanced Fault Localization in Underground Cables Using Varley and Murray Loop Techniques with Remote Monitoring Capability

Underground cable has been used to transmit power over the overhead lines due to several advantages, such as a lower likelihood of developing faults and better aesthetics. Because it is buried underground, it saves a lot of space as well as lowers the risk of human injury. One of the main disadvantages of underground cable is the ability to determine a fault location since it cannot be seen with the naked eye. The cable thumping method is recognized as one of the highly accurate methods to determine the fault location. However frequent thumping may result in weakening the insulation cable. In this paper, a system with the Varley Loop and Murray Loop methods is proposed to detect the fault location of the underground cable. The purpose of this algorithm is to find the fault accurately while not damaging the underground cable. Varley Loop is more suited for longer cables with higher resistance while Murray Loop is more suited for shorter cables with lower resistance. A physical prototype will be developed that has a remote monitoring capability through an LCD display.