There are three settings that are common for all four levels of protection: E81R, 81RVSUP, and 81RISUP. E81R is used to enable the number of elements you want to use. Voltage and current supervision are specified with the 81RVSUP and 81RISUP settings, respectively. What is the function of power system protection? For what purpose is IEEE device 52 used? Why are seal-in and 52a contacts used in the dc control scheme? In a typical feeder OC protection scheme, what does the residual relay measure? Electromechanical Reset? (Y/N) Const. Response NOT. Selectivity is a mandatory requirement for all protection, but the importance of it depends on the application. For example, unselective protection operation during a medium voltage network fault will cause an outage for an unnecessarily large number of consumers. You will learn to equate relay protection functions with logic diagrams and see how relay logic assigns protective. The Relays-Online training center offers you the information you need to get started with your protection and control products, as well as step-by-step guidance towards programming your products' functionality by creating and editing protection and control logics and configurations.
