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Hey All, Sorry if this was covered elsewhere, couldn't find a specific answer. Want to know the rule of thumb for choosing an infinite source (on the PRIMARY) based on XFMR size. Secondary side I know the calc. For example, if I have a 750 kVA XFMR according to a SKM model I need a 15000 MVA...

Hello, I am trying to determine the settings on an old GE electromechanical relay. There are three settings, pickup, time dial, INST. The time dial and INST values seem fairly straight forward. The pickup values howver show a plate with screws (see attached picture). How are you to determine...