Title :
13.8 kV selective high-resistance grounding system for a geothermal generating plant — A case study
Author :
Das, J.C. ; Perich, Edmundo
Author_Institution :
AMEC, Inc., Atlanta, GA, USA
Abstract :
13.8 kV selective high resistance grounding systems for bus connected generators are non-existent due to two reasons: One, the stray capacitance current of the system can be high, (>;10-12A); second the sensitivity and selectivity of the ground fault devices to detect low-levels of ground fault currents is required. The paper describes the relay types, sensors, settings on protective relays, flow of currents for various fault locations in a 13.8 kV system and demonstrates how a selective HRG has been implemented. To the author´s knowledge, there is no HRG selective system at 13.8 kV.
Keywords :
earthing; electric sensing devices; fault location; geothermal power stations; power generation faults; relay protection; bus connected generator; currents flow; fault location; geothermal generating plant; ground fault current device; protective relay, type sensor; selective HRG; selective high-resistance grounding system; stray capacitance current; voltage 13.8 kV; Capacitance; Circuit faults; Fault currents; Generators; Grounding; Resistors; Windings; Selective high resistance grounding system; neutral displacement relays; sensitive ground fault settings and coordination; zig-zag grounding transformer;
Conference_Titel :
Pulp and Paper Industry Technical Conference (PPIC), Conference Record of 2012 Annual IEEE
Conference_Location :
Portland, OR
Print_ISBN :
978-1-4673-0406-1
DOI :
10.1109/PPIC.2012.6292997
