Title :
Effectiveness of restricted ground fault protection with different relay types
Author :
Kojovic, Ljuhomir A. ; Day, Timothy R. ; Chu, Howard H.
Author_Institution :
Thomas A. Edison Tech. Center, Cooper Power Syst., Franksville, WI, USA
Abstract :
This paper presents a root cause analysis of a ground differential (restricted earth fault) protection misoperation including detailed description of the protection scheme, CT characteristics, and computer simulations performed to determine causes and solutions. High power laboratory tests were conducted to verify the simulation results in actual conditions and to compare effectiveness of the restricted earth fault protection design and operation using an overcurrent relay and a multifunction relay.
Keywords :
current transformers; electrical faults; overcurrent protection; relay protection; relays; CT characteristics; computer simulations; ground differential protection; high power laboratory tests; multifunction relay; overcurrent relay; restricted ground fault protection; Circuit faults; Circuit testing; Current transformers; Earth; Fault currents; Laboratories; Power system protection; Protective relaying; Stability; Substation protection;
Conference_Titel :
Power Engineering Society General Meeting, 2003, IEEE
Print_ISBN :
0-7803-7989-6
DOI :
10.1109/PES.2003.1270944
