Assessing mechanical deformations in two-winding transformer unit using reduced-order circuit model

Show simple item record Shah, Krupa Rajendra Ragavan, K. 2016-02-11T13:02:04Z 2016-02-11T13:02:04Z 2016-07
dc.identifier.citation Shah, Krupa Rajendra and Ragavan, K., “Assessing mechanical deformations in two-winding transformer unit using reduced-order circuit model”, International Journal of Electrical Power & Energy Systems, DOI: 10.1016/j.ijepes.2015.12.035, vol. 79, pp. 235-244, Jul. 2016. [To appear] en_US
dc.identifier.issn 0142-0615
dc.description.abstract Certain level of mechanical deformations in winding does not hamper the normal performance of power transformer. However, such incipient deformations if unattended could result in permanent failure of transformer. To this end, an approach is proposed to assess the severity of mechanical deformations in transformer winding. These deformations get reflected as changes in its high frequency behaviour. Hence, characterising the high frequency behaviour is essential. This requires building physically realisable ladder circuit corresponding to each winding. Thus, n-winding transformer is represented by n electrically and magnetically coupled ladder networks. In such scenario, the objective of fault diagnostics becomes very challenging. In this effort, realising the multi-winding unit by reduced-order ladder circuit model is explored. This approach essentially involves energising one winding at a time. Then, reduced-order ladder circuit of considered unit is synthesised from its measured driving-point impedance data. It is shown how these circuit models could be used for identifying mechanical deformations. To demonstrate capability of the method, two-winding model transformer is considered and deformations are introduced in its outer winding. Then, reduced-order circuit models are synthesised corresponding to healthy and faulty state of model transformer. The location of fault is identified by the changed parameter in the circuit. Further, the amount of change reveals the severity of introduced deformation. In all the cases, synthesised reduced-order circuit model agrees with that of model transformer with regard to driving-point impedance plot and results are found satisfactory. en_US
dc.description.statementofresponsibility by Krupa Rajendra Shah and K Ragavan
dc.format.extent Vol. 79, pp. 235-244
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Circuit synthesis en_US
dc.subject Diagnostics; Frequency response analysis en_US
dc.subject Mechanical deformations en_US
dc.subject Terminal measurement en_US
dc.subject Transformer en_US
dc.title Assessing mechanical deformations in two-winding transformer unit using reduced-order circuit model en_US
dc.type Article en_US
dc.relation.journal International Journal of Electrical Power & Energy Systems

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