Sequential tripping of steam turbine generators: Working Group report

Author

Fennell, Everett ; Kozminski, Kevin ; Bajpai, Munnu ; Easterday-McPadden, Steve ; Elmore, Walt ; Fromen, Charles ; Gardell, Jon ; Hartmann, Wayne ; Hurley, Joe ; Kerrigan, Patrick ; Khunkhun, Kumul ; Mozina, Charles J. ; Nail, George ; Patel, Subhash ; Pe

Author_Institution

ABB Power P&D Co., North Brunswick, NJ, USA

Volume

34

Issue

6

fYear

1998

Firstpage

1411

Lastpage

1418

Abstract

The practice of tripping 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

circuit breakers; machine protection; steam power stations; steam turbines; turbogenerators; backup motoring protection; overspeed operating condition; selection guidelines; sequential circuit breaker tripping; steam power plants; steam turbine-generator protection; Boilers; Manufacturing; Nails; Power & Energy Society; Power generation; Power system protection; Switches; Temperature; Turbines; Valves;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/28.739029

Filename

739029