Failure analysis of dry-type power transformer

Author

Paul, Dev

Author_Institution

Earth Tech, Oakland, CA, USA

Volume

37

Issue

3

fYear

2001

Firstpage

689

Lastpage

695

Abstract

This paper provides the failure analysis of a three-phase, dry-type, silicone resin vacuum-pressure encapsulated, 750/1000 kVA, AA/FA, 34.5 kV-480 Y/277-V, delta-wye power transformer. Transient overvoltage switching surge propagation through the transformer winding and protection margin is discussed. An arbitrary sensitivity of 10 pC at 120% rated voltage generally used for the partial discharge tests at the factory may be inadequate for the design of the failed transformer

Keywords

failure analysis; insulation testing; overvoltage; partial discharge measurement; power transformer insulation; power transformer testing; reliability; switching transients; transformer windings; 1000 kVA; 277 V; 34.5 kV; 480 V; 750 kVA; delta-wye power transformer; failure analysis; partial discharge tests; protection margin; silicone resin vacuum-pressure encapsulation; three-phase dry-type power transformer; transformer winding; transient overvoltage switching surge propagation; Arresters; Circuit breakers; Failure analysis; Power system modeling; Power system protection; Power system transients; Power transformers; Surge protection; Switches; Voltage control;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/28.924746

Filename

924746