A bit of confusion I need clarification on. We have 5 kv starters with Multilin motor protectors that have ground fault protection. There are two CT inputs, one a 1 Amp input for a 2000/1 ratio CT and another for a 5 Amp CT input (donut type). Given a typical HP range in our plant of 800 to 1250 HP, how do I determine what is the best CT arrangement and primary current trip setting to protect my motors from significant damage. We have resistance grounded 5 kv busses if that is significant to setting.
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