Title :
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
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;
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
