Modeling transformers with off-nominal ratios for unbalanced conditions

Papathanassiou, SA

dc.contributor.author	Papathanassiou, SA	en
dc.date.accessioned	2014-03-01T01:51:54Z
dc.date.available	2014-03-01T01:51:54Z
dc.date.issued	2002	en
dc.identifier.issn	02721724	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26505
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0036477163&partnerID=40&md5=0cf1ef7bf686f25f52f101c7bfd19ee3	en
dc.subject	Load tap changer	en
dc.subject	Off-nominal ratio	en
dc.subject	Sequence equivalent circuits	en
dc.subject	Transformer	en
dc.subject	Unbalanced conditions	en
dc.subject.other	Computer simulation	en
dc.subject.other	Electric fault currents	en
dc.subject.other	Electric grounding	en
dc.subject.other	Electric impedance	en
dc.subject.other	Electric loads	en
dc.subject.other	Electric power systems	en
dc.subject.other	Electric windings	en
dc.subject.other	Equivalent circuits	en
dc.subject.other	Load tap changers (LTC)	en
dc.subject.other	Electric transformers	en
dc.title	Modeling transformers with off-nominal ratios for unbalanced conditions	en
heal.type	journalArticle	en
heal.publicationDate	2002	en
heal.abstract	This letter presents the positive, negative, and zero sequence equivalent circuits of transformers with off-nominal ratios (ONRs). Such are transformers equipped with load tap changers (LTC), or fixed off-load tap positions. In the zero sequence equivalent the presence of neutral grounding impedances is also taken into account. The circuits presented are identical in form to the well-known sequence equivalents, but the series and grounding impedances are properly modified by the off-nominal ratios.	en
heal.journalName	IEEE Power Engineering Review	en
dc.identifier.volume	22	en
dc.identifier.issue	2	en
dc.identifier.spage	50	en
dc.identifier.epage	52	en