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"All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
It is the symbolic representation of a two-winding transformer's vector group. I suppose that the correct notation should be YNd1, and not as you have mentioned (YND1). The first (capital) letter 'Y' denotes that the transformer's High Voltage Winding is connected in STAR. The following capital 'N' represents that the HV side neutral is brought out (for earthing and/or distribution purposes). The following small 'd' denotes that the LV winding of the transformer is connected in Delta. The following numeral '1' implies that the LV voltage lags behind the HV Voltage by 30 degrees. ('1' is the clock hour representation for minus 30 degrees).
If you can send me your mail ID thro this forum's mailbox, I shall send you a write-up on transformer vector group.
Engineer
Re: engineer
