Directional earth fault relay operation in mutually coupled multiple circuit distribution lines

Author

Perera, Lasantha B.

Author_Institution

Sch. of Eng. Syst., Queensland Univ. of Technol., Brisbane, QLD, Australia

fYear

2010

fDate

5-8 Dec. 2010

Firstpage

1

Lastpage

6

Abstract

Many of the power utilities around the world have experienced spurious tripping of directional earth fault relays in their mesh distribution networks due to induced circulating currents. This circulating current is zero sequence and induced in the healthy circuit due to the zero sequence current flow resulting from a ground fault of a parallel circuit. This paper quantitatively discusses the effects of mutual coupling on earth fault protection of distribution systems. An actual spurious tripping event is analyzed to support the theory and to present options for improved resilience to spurious tripping.

Keywords

coupled circuits; power distribution faults; power distribution lines; power distribution protection; relay protection; directional earth fault relay operation; earth fault protection; ground fault; induced circulating current; mesh distribution network; mutual coupled multiple circuit distribution line; mutual coupling effect; parallel circuit; power utility; spurious tripping; zero sequence current flow; Circuit faults; Current measurement; Earth; Impedance; Mutual coupling; Relays; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Universities Power Engineering Conference (AUPEC), 2010 20th Australasian

Conference_Location

Christchurch

Print_ISBN

978-1-4244-8379-2

Electronic_ISBN

978-1-4244-8380-8

Type

conf

Filename

5710737