Answer / Desh Deepak

Relay coordination is the process of ensuring that each protective relay in an electrical power system operates independently and without interference from other relays. The inputs required for this include: 1. System specifications (e.g., voltage, current, frequency). 2. Overcurrent protective device ratings. 3. Time-current coordination curves for each protective relay. To calculate the relay settings, the time-current coordination curve of each relay is compared to ensure that it will operate before other relays in case of a fault. The Inverse Time Characteristic (ITC) method is often used for this purpose.

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