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

fYear

2012

fDate

17-21 June 2012

Firstpage

1

Lastpage

14

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Pulp and Paper Industry Technical Conference (PPIC), Conference Record of 2012 Annual IEEE

Conference_Location

Portland, OR

ISSN

0190-2172

Print_ISBN

978-1-4673-0406-1

Type

conf

DOI

10.1109/PPIC.2012.6292997

Filename

6292997