A new power-based digital algorithm for generator protection

Author

Usta, Ömer ; Bayrak, Mehmet

Author_Institution

Fac. Electr. Eng., Istanbul Tech. Univ., Turkey

Volume

20

Issue

2

fYear

2000

fDate

2/1/2000 12:00:00 AM

Firstpage

49

Lastpage

52

Abstract

In this letter a new power-based digital algorithm is introduced to provide protection for the generators against unbalanced faults. The algorithm measures the generator´s three-phase power output and monitors the sinusoidal component of the instantaneous power. When the magnitude of the sinusoidal component exceeds a predefined value, the algorithm checks the direction of the negative sequence-reactive power flow to discriminate between internal and external faults. The proposed algorithm initiates fast tripping for internal asymmetrical faults, and provides back up protection for external unbalanced conditions

Keywords

electric generators; electrical faults; load flow; machine protection; power measurement; reactive power; back up protection; external faults; external unbalanced conditions; fast tripping; generator protection; instantaneous power; internal asymmetrical faults; internal faults; negative sequence-reactive power flow; power-based digital algorithm; sinusoidal component magnitude; three-phase power output measurement; unbalanced faults; Change detection algorithms; Equations; Fault detection; Frequency; Load flow; Power generation; Power system protection; Stator windings; Synchronous generators; Voltage;

fLanguage

English

Journal_Title

Power Engineering Review, IEEE

Publisher

ieee

ISSN

0272-1724

Type

jour

DOI

10.1109/39.819918

Filename

819918