This course explains protection relay selection process by detailing how to protect against each fault type or abnormal condition. Also, recommendations are made for what is considered to be minimum protection as a baseline. After making the baseline, extra protection relays . There are two ways to classify the different types of protection used on the generator: Relays provide protection by identifying problems outside the generator. The protection engineer has to balance the expense of. -Impedance Grounded Gens) 87GD – Ground Differential Current 67N – Residual Directional Overcurrent 50N – Instantaneous Neutral Overcurrent 51N – Inverse Time Neutral Overcurrent System Backup Protection for Phase Faults 21 – Phase Distance 51V – Voltage R/C Inverse Time Phase Overcurrent System. There are protection functions against phase faults, ground faults, loss of excitation (LOM), over- excitation, overvoltage, unbalanced currents, abnormal frequencies, motoring, dead machine energization, breaker failures and system faults. Get precisely tailored functionality for any application and pay only for what you. This document provides recommendations, background and philosophy on relay protection that is not available in M07.
