Phase angle regulating transformer protection

Author

Ibrahim, M.A. ; Stacom, F.P.

Author_Institution

New York Power Authority, White Plains, NY, USA

Volume

9

Issue

1

fYear

1994

fDate

1/1/1994 12:00:00 AM

Firstpage

394

Lastpage

404

Abstract

This paper describes the protection of a 345 kV, 450 MVA three phase, phase angle regulating (PAR) transformer. The transformer includes load tap changers which permit phase angle variations of 25° advance to 25° retard in a total of 32 steps (16 advance, 16 retard). The series unit and the exciting unit of the PAR are mounted in separate tanks, with four throat connections between the tanks (three-single phase primary connections and one-three phase secondary connection). The series unit is rated 86270 V/66122 V with the secondary windings delta connected and the exciting unit rated at 345000 V/67728 V grounded wye-grounded wye. The exciting unit is of three legged core type construction

Keywords

exciters; power transformers; transformer protection; transformer windings; 345 kV; 450 MVA; 66122 V; 67728 V; 86270 V; delta connection; grounded wye; load tap changers; phase angle regulating transformer; phase angle variations; single phase primary connections; three legged core type construction; three phase secondary connection; throat connections; transformer protection; Control systems; Load flow; Power & Energy Society; Power system relaying; Printing; Protection; Silicon compounds; Switches; Virtual colonoscopy; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.277711

Filename

277711