One approach to test the total protection system is to use primary injection techniques (see appendix H) that trigger protective relays and lockout relay, trip circuit breakers, and initiate annunciations and indications. Since the basic function of a protection relay is to correctly function under abnormal. Applications: Multi-functional, covering overcurrent, distance, and differential protection. Features: Highly programmable, accurate, and capable of storing diagnostic data. Function: Process inputs through microprocessors for advanced protection. COMPREHENSIVE INSPECTION, MAINTENANCE AND TESTING PROGRAM. ” relay may only need to operate for 0. Hence a. Although testing of individual components may take place on a regular basis (e., relay calibration and lockout relay testing), it is essential to test the entire protection circuit, including wiring, and all connections from “beginning to end” to ensure integrity of the total circuit. Protective relays are extensively utilized throughout the power system to promptly remove any element from service experiencing a short circuit, operating abnormally, or posing a risk to system operation. Instrument transformers support the relaying equipment in this task by sensing.
