Original scientific paper

Short-circuit withstand capability of power transformers - Part I

Rene Smeets orcid.org/0000-0001-5788-2858 ; Kema Laboratories, DNV GL

Abstract

This article discusses verification of the ability of a transformer to survive short circuit. Fault current leads to large axial and radial forces on windings, which have to be managed by proper structural design. Test experience, showing a failure rate of 20-25 % of well-prepared transformers, suggests that the highest degree of reliability with respect to short-circuit withstand verification is ensured through full-scale testing in accordance with the international standards. The prime failure mode is winding deformation, but many other deficiencies, which would not be discovered in a design review, have also been observed. Since 2016, KEMA Laboratories is equipped to short-circuit test transformers up to the 800 kV class.

Keywords

power transformer; short circuit; testing; certification; reliability

Hrčak ID:

179590

URI

https://hrcak.srce.hr/179590

Publication date:

8.4.2017.

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