For example, let's assume a fault external to the microgrid in which the voltage and frequency levels are outside the ride through range. Which protection should act first: 27, 67 or 81? Could a directional overcurrent relay act faster than a frequency relay in these conditions?
Dear Cleberton Reiz, in this case, why do you need to establish priorities for these protections functions? All of them will have the same effect, i.e. islanding the microgrid, right? As I see, if your microgrid is outside the fault ride through region for the required amount of time, it is entitled to go into island mode. It does not matter what protection function wins the race to trip the breaker first. Am I missing something?
Dear Erick F. Alves, thanks for the reply. I'm coordinating the protection of both the microgrid and distribution network. However, I noticed the absence of information about action priority in specialized literature. I share the same opinion as yours: microgrid protections for island mode are redundant in this case, no matter which one will act first.
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