Monitoring faults on 480V ungrounded delta

Monitoring faults on 480V ungrounded delta

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This is an old hydrocarbon plant in Bushton, Kansas. Management has turned down my request to change out the 480V ungrounded delta transformers and replace with wye grounded 277/480V secondaries.

Does anybody know of a fault monitoring system that would alarm in the event of a low impedance fault?

I want to place these at the secondary of the transformers and wire the alarm to the new DCS, distributed control system. Yes, management did want to spend $2million on new DCS and instrumentation in the plant.:-?
 
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