Failure analysis of dry type power transformer

Author

Paul, Dev

Author_Institution

Kaiser Eng., Oakland, CA, USA

Volume

5

fYear

2000

fDate

2000

Firstpage

3232

Abstract

This paper provides the failure analysis of 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 pico-coulombs (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

encapsulation; failure analysis; overvoltage; partial discharge measurement; power transformer protection; power transformer testing; silicone insulation; surges; transformer windings; transients; 1000 kVA; 277 V; 3.45 kV; 480 V; 750 kVA; delta-wye power transformer; dry type power transformer; failed transformer; failure analysis; partial discharge tests; silicone resin vacuum pressure encapsulation; three phase; transformer winding; transient overvoltage switching surge propagation; vacuum pressure impregnation; Failure analysis; Partial discharges; Power system modeling; Power system transients; Power transformers; Production facilities; Surge protection; Switches; Testing; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2000. Conference Record of the 2000 IEEE

Conference_Location

Rome

ISSN

0197-2618

Print_ISBN

0-7803-6401-5

Type

conf

DOI

10.1109/IAS.2000.882629

Filename

882629