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I am trying to apply a distance relay for Zone 3 (reverse direction) on a ring bus and have two breakered lines in the reverse direction with different impedances. What would be some philosophies in providing proper relaying? Would one relay for the higher impedance, the lower impedance or a...

Given the %impedance of a power transformer, how can the actual impedance be determined? The transformer in question is an autotransformer base rated at 900 MVA with an H impedance of 7.03%, the X of 54.8% and a Y of 48.03%. Voltage on H is 525 KV, on X is 240 KV and on Y is 25 KV (Y is the...