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Saminathan
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Join Date: Apr 2012
Posts: 9

Invertor Trafo Neutral Grounding

11/21/2012 4:46 AM

Why Invertor trafo neutral is not grounding at many plants? kindly explain me if neutral is grounding, what are the merits & demerits?
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PWSlack
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#1

Re: Invertor trafo neutral grounding

11/21/2012 4:57 AM

Try the Wikipedia article on earthing systems and then ask at the plants where the <...Invertor trafo neutral is not grounding...> why IT is done that way (pun intended).

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electricalexpert65
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#2

Re: Invertor Trafo Neutral Grounding

11/22/2012 8:49 AM

I suppose by inverter tranasformer you mean a three winding transformer with a primary winding which is either star connected or delta connected and two secondaries, one with star connected windings and the other with delta connected windings. Is it so? Pl. confirm to answer further.
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Saminathan
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Posts: 9
#3
In reply to #2

Re: Invertor Trafo Neutral Grounding

11/23/2012 2:01 AM

Yes, It is Double secondary Trafo. one is Star and another is Delta winding.
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electricalexpert65
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#4
In reply to #3

Re: Invertor Trafo Neutral Grounding

11/23/2012 8:24 AM

If it is a three-winding trafo., with two secondaries, one star and the other delta, it must be feeding a 12-Pulse rectifier; this 12-pulse rectifier would be 2, 6-Pulse bridge rectifiers, one fed from the star secondary and the other from the star secondary. Now, since the star secondary is going to feed a three-phase bridge rectifier, which is a three-phase, three-wire load, the neutral of this star secondary need not be distributed. As such, there is no big advantage in earthing this neutral. It can be left floating.
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electricalexpert65 (2); PWSlack (1); Saminathan (1)

Previous in Forum: Regarding ACB Protection for SCR Panel   Next in Forum: What is the Normal Current Through NGR of 25 MW, 11 KV TG Set

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