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Transient response of transformer with XLPE insulation cable winding design
University of Dar es Salaam, Tanzania.
Uppsala University.
Uppsala University. (EMC)ORCID iD: 0000-0002-1607-2493
2005 (English)In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 27, no 1, 69-80 p.Article in journal (Refereed) Published
Abstract [en]

Significant advances in XLPE insulation cables that have higher electric field strength withstand capability have made it possible to apply these high voltage (HV) cables as windings in generators and transformers. Therefore, the recent advent of HV generator (Powerformer) that can be connected directly to the power transmission line has motivated the design of HV transformer (Dryformer) that performs one step transformation from transmission to distribution voltage levels. Since the dryformer will be connected directly to transmission lines, they will be subjected to transients resulting from direct and indirect lightning strikes as well as fast switching surges from Gas insulated circuit breakers. This paper presents the results of experimental studies on the cable winding power transformer (Dryformer) to study its response to various transients. Experimental investigations have been carried to obtain the transformer model parameters based on terminal measurement of admittance functions using Network Analyser, and hence for comparing the model predictions with experimentally obtained responses. The model has been successfully used in estimating the dryformer transient responses at its terminals due to surge application of various front times and peak amplitudes that are representative of lightning and switching caused transients. Experiment and simulation results show that there are considerable differences in the transient response characteristics of dryformer windings as compared to that of transformers with traditional winding design. These differences on transient responses are discussed in perspective of their basic difference in winding design features.

Place, publisher, year, edition, pages
2005. Vol. 27, no 1, 69-80 p.
Keyword [en]
transformers, cable windings, dryformer
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-62565DOI: 10.1016/j.ijepes.2004.07.010ISI: 000225055600008OAI: diva2:480609
QC 20120305Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2012-03-05Bibliographically approved

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Thottappillil, Rajeev
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