Influence of difference system parameters on operating conditions of third harmonic ground-fault protection system of unit-connected generator

Author

Zielichowski, Mieczyslaw ; Mydlikowski, Remigiusz

Author_Institution

Inst. of Electr. Power Eng., Wroclaw Univ. of Technol., Poland

Volume

19

Issue

2

fYear

2004

fDate

4/1/2004 12:00:00 AM

Firstpage

560

Lastpage

564

Abstract

In the paper, the influence of unbalance of the measuring element of the unit-connected generator stator ground-fault protection system excited by the ratio of third harmonic voltage to ground in the generator neutral and at the generator terminals on the value of the voltage supplied to the measuring element during ground faults is analyzed. The analysis is made for currently used ground-fault protection systems in which the measuring element is balanced by an autotransformer voltage divider or an impedance bridge.

Keywords

AC generators; autotransformers; earthing; machine protection; power system protection; stators; autotransformer; difference system parameters; generator neutral; generator terminals; impedance bridge; measuring element; third harmonic ground-fault protection system; unit connected generator; voltage divider; Bridge circuits; Circuit faults; Current measurement; Grounding; Harmonic analysis; Helium; Impedance measurement; Power system protection; Stators; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2004.825123

Filename

1278409