Abstract

Electrical energy in distribution system can be delivered to customers in two ways: Overhead (OH) lines\nand Underground (UG) cables. Most of the existing distribution systems supply power to consumers through OH lines.\nThese lines are converted to UG cables mainly for aesthetic purpose and reduce interruption to customer. So, during\nrestructuring of existing network, it is important to carry out reliability assessment and Load Flow Analysis (LFA) for\nexisting network and planned network. The main objective of reliability assessment is to quantify and compare reliability\nindices for various reliability improvement initiatives/network configurations. Load flow analysis is carried out to find\nline flows, bus voltages and system voltage profile, effect of change in system configuration, possible improvements to\nan existing system by proposing required compensation. In this paper, study has been conducted on the existing\ndistribution system of Jawaharlal Nehru Technological University Anantapur College of Engineering Anantapuramu\n(JNTUACEA), where it is planned to replace existing OH lines with UG cables. It is a miniature form of our modern day\ndistribution system, where lighting, motor and ac load exist simultaneously, and also continuity of power supply needs to\nbe maintained. The reliability indices for this system are evaluated using the concept of failure modes and effect analysis\n(FMEA) for radial distribution systems.