• Operational restrictions at low load can make coordination calculations easier, for example, most large HV motors would not operate, therefore their starting performance should not be taken into account when considering panel feeder circuit breakers. .• When all overcurrent curves are plotted for main generators, transformer feeds, large motors, and downstream feeds, they tend to be located "close together" and without much adjustment room. 1. Radial System• The specific protection relay like primary or backup is important in the distribution system. When the relay is applied to protect its own system element, it is considered a primary relay. When used to back up other relays in the event of a remote failure, it serves as a backup relay. • Providing both functions simultaneously; serving as a primary relay for its own zone protection and as a backup relay for a remote protection zone. The protection relay must be coordinated in time, so that the primary relay always operates faster than the backup relay. • So, relay setting and coordination is the very important part to make sure which relay represents primary and other. for backup.2. Main ring system • To adjust the relay, the same method is used for the ring system and the radial system. However, the circuit must be open, starting at the source point to form a two-ray circuit before setting the relay. First, follow clockwise direction. • The relay setting starts with R1 and the concept is the same as that of the radial system. Second, follow counterclockwise and the system will form a radial circuit. SYSTEM ANALYSIS: System DIRECTION OF RELAY OPERATION: Clockwise 1 2 3 4 5 6 Counterclockwise 8 13 12 11 10 ...... middle of paper ..... .GENERATOR DATA: NODE Sa(MVA) Vp(kV) X(%)7 150 10 158 150 10 15CT RATIO: RELAY NO. RATIO1 2402 2403 1604 2405 2406 2407 2408 2409 16010 24011 24012 24013 240Works CitedBIOGRAPHIES:1.Aniket Chaturvedi: Student of SARDAR INSTITUTE OF TECHNOLOGY VALLABHBHAI PATEL, .2.Ritu Barad: Student of SARDAR INSTITUTE OF TECHNOLOGY VALLABHBHAI PATEL, GTU. 3.Dhruvi Shukla: Student of SARDAR INSTITUTE OF TECHNOLOGY VALLABHBHAI PATEL, GTU.4.M. Nilay N. Shah: Assistant Professor of SARDAR INSTITUTE OF TECHNOLOGY VALLABHBHAI PATEL, GTU. SINCE 2004. HE IS CURRENTLY A PH.D AND HIS AREAS OF RESEARCH ARE DYNAMICS OF ELECTRICAL SYSTEMS, FACTS, PROTECTION OF ELECTRICAL SYSTEMS AND ELECTRICAL MACHINES.