When a fault occurs, it is not the breaker that decides whether power should be interrupted. That judgment is made upstream by the relay interpreting system, which interprets system conditions and determines whether isolation is necessary and, if so, how quickly and how. Consideration is given to availability and location of breakers, current sensing devices, and disconnect switches, as well as bus-switching scenarios, and their impact on the selection and application of bus protection. A number of bus protection schemes are presented; their adequacy, complexity. Browser-based tools for first-pass event review, overcurrent coordination, directional logic, phasor interpretation, Fortescue component analysis, and more, built for studies, fault analysis, technical explanation, and training. Open COMTRADE Waveform, timing, phasors, cursors. Check Coordination. 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. Applications of the concepts to accepted transmission line-protection schemes are also presented. For example, unselective protection operation during a medium voltage network fault will cause an outage for an unnecessarily large number of consumers. While this is bad, It's not a.
