Investigations of an EHV autotransformer tested with open and arrester terminated terminals

Author

Seitlinger, W.P. ; Foschum, H. ; Wagenaar, L.B. ; Fleeman, J.A.

Author_Institution

Elin Transformation GmbH, Weiz, Austria

Volume

11

Issue

1

fYear

1996

fDate

1/1/1996 12:00:00 AM

Firstpage

312

Lastpage

322

Abstract

The special termination lightning impulse test was devised to ensure that transformers are adequately designed for service conditions not presently covered by standard test procedures. Analytic studies and factory tests were made on an EHV power transformer to show effects of this test on a particular design. Calculations predicted terminal and internal voltage responses to the new test and were verified by good correlation with the tests. Analysis of internal voltages indicate that the new test is meaningful for this particular transformer. Examination of terminal responses indicate that the clamping action of the arrester prolongs the voltage crest at the nonimpulsed terminals

Keywords

arresters; autotransformers; impulse testing; power transformer testing; power transformers; transformer windings; EHV autotransformer; arrester terminated terminals; clamping action; open terminals; power transformer; service conditions; standard test procedures; termination lightning impulse test; voltage crest; voltage response; Arresters; IEC standards; Impulse testing; Leg; Lightning; Performance evaluation; Power transformer insulation; Production facilities; Transformer cores; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.484030

Filename

484030