Dry Type Delta Delta Trafo for Vessel

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DANSES Active Contributor Join Date: Jul 2010 Location: Jakarta Posts: 17	Dry Type Delta Delta Trafo for Vessel 08/07/2012 8:45 AM
	Gents, In Vessel, mostly for lighting and small distribution will be fed from Dry Type Trafo Delta/Delta. And then, impact for consumers must be input 1 Phase Hot Hot Wire. Is it because IT wiring system? In some Offsore facility they using delta wye trafo. In Land/Onshore mostly we using Delta Wye transformer due to TT, TNS, wiring system. Does any body have another reason why we should be choose Delta Delta trafo for Vessel System?
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Anonymous Poster #1	#1 Re: Dry Type Delta Delta Trafo for Vessel 08/07/2012 8:53 AM
	In general, mostly for single phase loading, Delta/Star Trafo using. And then impact for customers must be 1 Phase Hot Hot wire and back neutral. Not IT. TT or they TNC-S using. Nobody good reason Delta Delta trafo for Onshore using.
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Wal Guru Join Date: Jun 2011 Location: Phnom Penh Posts: 4019 Good Answers: 102	#2 Re: Dry Type Delta Delta Trafo for Vessel 08/07/2012 11:43 PM
	Safety and corrosion mitigation Delta Delta is isolating. No ground reference. No step voltage shore-vessel. No potential phase-hull. __________________ Difficulty is not an obstacle it is merely an attribute.
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DANSES Active Contributor Join Date: Jul 2010 Location: Jakarta Posts: 17	#3 In reply to #2 Re: Dry Type Delta Delta Trafo for Vessel 08/09/2012 3:17 AM
	Agree. Sometimes we need to wise in design in terms of application. We cannot put any good point in one hand. In ship application, I guess we need to maintain no backflow from hull except we have more than 1 ground fault and make close circuit. I like to said above because in mostly electrical wiring, delta delta system is not recommended because ground overvoltage uncontrolled, stress caused by unremoved faults, circulating current due to unbalance, etc. So mitigation is we require PIM or EFM and locator and also we required to design balance at each phase (consumers 1 phase).
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Anonymous Poster (1); DANSES (1); Wal (1)

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