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12,470V dredge cable ground wire monitor

12,470V dredge cable ground wire monitor

12,470V dredge cable ground wire monitor

(OP)
My question has to do with providing for ground wire monitoring when there is a 12,470 3 phase pole line at the dredge location and the dredge is fed from a 12,470 trailing cable.  dredge is in the USA.

Is there a need for a 12,470 delta/wye isolation transformer at the base of the pole in order to establish an isolated resistance ground for the trailing cable or can the 3 phase wye system from the utility be used to feed a skid mounted breaker and isolation switch with a ground wire monitor device?

I hope my question makes sense. Thanks in advance.

Dan

RE: 12,470V dredge cable ground wire monitor

You need to install the transformer to establish a new isolated system for your resistance grounded system.
The utility multi wye grounded system cannot be used by just putting in a grounding resistor at your location.
Jim

RE: 12,470V dredge cable ground wire monitor

(OP)
Jim,

Thanks for the reply.

Would it make a difference if the 750kVA 12,470V isolation transformer had Y-Y windings rather than D-Y windings?

Dan

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