Practical design of generator surge protection

Author

Dick, E.P. ; Gupta, B.K. ; Porter, J.W. ; Greenwood, A.

Author_Institution

Ontario Hydro, Toronto, Ont., Canada

Volume

6

Issue

2

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

736

Lastpage

743

Abstract

Generator withstand voltages, overvoltages from the power system, and arrester capabilities are critically reviewed. The specified withstand is compared with tested breakdowns for some 248 coils in five large machines using DC, power frequency, and impulses. System stresses normally prescribed for lightning are supplemented to included HV line faults, circuit breaker closing, reignitions and restrikes, fault clearing, arcing faults on the isolated phase bus, harmonic line resonance, ferroresonance, transformer HV to LV faults, the effects of stuck breaker poles, and other contingencies. It is found that internal winding stresses may be amplified due to resonance and slot reflection effects. The vulnerability of arresters to temporary overvoltages is considered. Practical guidelines for the design of generator surge protection are provided

Keywords

electric generators; machine protection; machine testing; surge protection; DC breakdown tests; HV line faults; arcing faults; arrester capabilities; circuit breaker closing; fault clearing; ferroresonance; generator surge protection; harmonic line resonance; impulse tests; internal winding stresses; isolated phase bus; lightning; power frequency testing; power system; reignitions; restrikes; slot reflection effects; stuck breaker poles; transformer HV to LV faults; withstand voltages; Arresters; Circuit faults; Circuit testing; Power generation; Power system faults; Power system protection; Resonance; Surge protection; Surges; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.131134

Filename

131134