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thread238-268196 said:Before there were multifunction numerical relays, there would be a 50 relays for phase protection and a seperate 50 for zero sequence protection 50N. With the newer relays there needs to be a way of differentiating between the different available protective devises included within the one packaged relay. 50P, 50N, 50R, 67P, 67N..
thread238-268196 said:The relay contains different functions, or modules, such as 50/51P for positive sequence, 50/51G for zero sequence (residual, ground), and 50/51Q for negative sequence currents.