Mathematical and Simulink Analysis of Relay Coordination Essay

†¢ Operational restrictions at light load may assist the coordination calculations e.g. most large HV motors would not be running, hence their starting performances need not be considered, when switchboard feeder circuit breakers are being examined. †¢ When all the overcurrent curves are plotted for the main generators, transformer feeders, large motors and downstream feeders, they tend to be located ‘close together’, and without much room for adjustment. 1. Radial System †¢ The specific protective relay as primary or backup is important in distribution system. When relay applied to protect its own system element it is thought of primary relay, when to backup other relays for fault at remote location, it is serving as backup relay. †¢ Providing both functions simultaneously; serving primary relay for its own zone protection and backup relay for remote zone of protection. The protective relay must be time-coordinated, so that the primary relay will always operate faster than the backup relay. †¢ So, the setting and coordination of the relay is the very important part to make sure which relay stands for primary and the other one for backup. 2. Ring Main System †¢ To setting relay, the same method is used for both ring and radial system. However, the circuit must be opened, start at the source point to form a two radial circuit before setting the relay. First, followed the clockwise. †¢ The relay setting start with R1 and the concept same like radial system. Second, followed the anticlockwise and the system will form a radial circuit. SYSTEM ANALYSIS: System DIRECTION OF RELAY OPERATION: Clockwise 1 2 3 4 5 6 Anticlockwise 8 13 12 11 10 ... ... GENERATOR DATA: NODE Sa(MVA) Vp(kV) X(%) 7 150 10 15 8 150 10 15 CT RATIO: RELAY NO. RATIO 1 240 2 240 3 160 4 240 5 240 6 240 7 240 8 240 9 160 10 240 11 240 12 240 13 240 Works Cited BIOGRAPHIES: 1.Aniket Chaturvedi: Student of the SARDAR VALLABHBHAI PATEL INSTITUTE OF TECHNOLOGY,GTU. 2.Ritu Barad: Student of the SARDAR VALLABHBHAI PATEL INSTITUTE OF TECHNOLOGY,GTU. 3.Dhruvi Shukla: Student of the SARDAR VALLABHBHAI PATEL INSTITUTE OF TECHNOLOGY,GTU. 4.Mr.Nilay N. Shah: Assistant Professor of SARDAR VALLABHBHAI PATEL INSTITUTE OF TECHNOLOGY,GTU.SINCE 2004. HE IS CURRENTLLY PURSING PH.D AND HIS RESEACH AREA ARE POWER SYSTEM DYNAMICS, FACTS , POWER SYSTEM PROTECTION AND ELECTRICAL MACHINE.