Step-by-step tutorial on building a time-current coordination chart for a three-level protection system. To ensure that protective relays, circuit breakers, and other protection devices correctly and selectively isolate faults, minimizing damage to equipment and interruptions to customers while maintaining system stability. One-line diagrams and detailed network data (lines, transformers, buses). Protection coordination is one of those skills where the theory is simple and the practice is. Protective Relays - Technical Seminar Nov 2016 - Copyright: IEEE 2 Abstract: Protective relays and devices have been developed over 100 years ago to provide “lastline”of defense for the electrical systems. They are intended to quickly identify a fault and isolate it so the balance of the system. Relay protection systems are the unsung heroes of electrical networks. Three fundamental components required for each circuit breaker.
