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Ground Differential Protection and Auto-transformer CT

Ground Differential Protection and Auto-transformer CT

Ground Differential Protection and Auto-transformer CT

(OP)
I would like to use an auto-transformer auxiliary CT with electromechanical relays for ground differential protection on a delta-wye resistor grounded transformer.  The CT on the neutral is 200/5 and 2000/5 on the low side of the transformer.  I need 10:1 ratio on the auto-transformer.  I am having trouble in locating someone who makes the auto-transfomer type CT.  Any help would be greatly appreciated.

RE: Ground Differential Protection and Auto-transformer CT

Why do you want an auto-transformer type CT?  Wouldn't a two-winding aux CT work?  

RE: Ground Differential Protection and Auto-transformer CT

(OP)
Because of possible Aux CT saturation and the high burden placed on the CTs by the electromechanical relays.

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