Sequential tripping of steam turbine generators

Author

Fennell, E. ; Kozminski, K. ; Bajpai, M. ; Easterday-McPadden, S. ; Elmore, W. ; Fromen, C. ; Gardell, J. ; Hartmann, W. ; Hurley, Jason ; Kerrigan, P. ; Mozina, Charles ; Nail, G. ; Patel, Surabhi ; Pence, G. ; Pierce, A. ; Usman, Saeeda ; Waudby, P. ; Y

Volume

14

Issue

1

fYear

1999

fDate

1/1/1999 12:00:00 AM

Firstpage

132

Lastpage

141

Abstract

The practice of tripping the generator breakers immediately following a boiler/turbine trip exposes a steam turbine generator to a potentially damaging overspeed operating condition. This paper describes the use of the sequential trip mode as a means of minimizing the exposure to possible unit damage following a boiler/turbine trip. Included is a comparison of the application of devices used by several major steam turbine generator manufacturers in accomplishing sequential tripping of the unit. This paper also discusses the differences in the devices used in implementing the tripping scheme and those applied as backup motoring protection. Additionally, the paper provides guidance in the selection of which functions should and should not be used to initiate sequential tripping

Keywords

boilers; machine protection; steam turbines; turbogenerators; backup motoring protection; boiler trip; overspeed operating condition; sequential tripping; shutdown process; steam turbine generators; turbine trip; Boilers; Machinery; Manufacturing; Nails; Power & Energy Society; Power generation; Power system protection; Power system relaying; Stress; Turbines;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.736702

Filename

736702