Analysis of a generator step-up transformer failure following faulty synchronization

Author

Pasternack, Bernard M. ; Provanzana, John H. ; Wagenar, L.B.

Author_Institution

American Electr. Power Service Corp., Columbus, OH, USA

Volume

3

Issue

3

fYear

1988

fDate

7/1/1988 12:00:00 AM

Firstpage

1051

Lastpage

1058

Abstract

An analysis was carried out to investigate an out-of-phase synchronizing condition which resulted in the failure of a 725 MVA GSU (generator step-up) transformer. Using a technique described, the circuit breaker closing angle was estimated from oscillograph traces. This information was used with the Electromagnetic Transients Program (EMTP) to simulate the disturbance events and thereby produce a complete set of probable synchronizing currents and generator electrical torques experienced during the disturbance. The analysis of the simulation results, and the analysis of the failure of the GSU transformer have been viewed in light of the large number of prior system faults in the vicinity of the transformer. A review of the ANSI/IEEE standards on transformer fault withstand capabilities as related to this type of analysis is presented

Keywords

circuit breakers; electric generators; failure analysis; power transformers; transients; 725 MVA; ANSI/IEEE standards; EMTP; Electromagnetic Transients Program; GSU transformer; circuit breaker closing angle; disturbance events; generator step-up transformer failure; out-of-phase synchronizing condition; ANSI standards; Analytical models; Circuit breakers; Circuit faults; Circuit simulation; EMTP; Failure analysis; Power generation; Rivers; Strontium;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.193886

Filename

193886