Ground Fault Protection for Bus-Connected Generators in an Interconnected 13.8-kV System

Author

Das, J.C.

Author_Institution

AMEC E&C Services, Inc, Tucker, GA

Volume

43

Issue

2

fYear

2007

Firstpage

453

Lastpage

461

Abstract

This paper is based on modifications implemented in the protection and grounding systems of a large paper mill and describes selective ground fault protection for a 13.8-kV system with multiple bus-connected generators, synchronous bus ties, and utility interconnections. The ground fault current in the system is reduced from the existing 3400 A to 500 A, and a hybrid grounding system is implemented for each of the generators. As the ground fault currents are reduced to limit the fault damage, the sensitivity and selectivity of the ground fault protection become important. Directional ground fault relays with coordinating pickup settings are applied to achieve this objective. The new platform for directional elements (numerical relays) drives its performance from sequence impedance measurements

Keywords

earthing; fault currents; fault diagnosis; paper mills; power system interconnection; relay protection; 13.8 kV; bus-connected generators; fault current; ground fault protection; hybrid grounding system; paper mill; selective ground fault protection; sequence impedance measurement; synchronous bus ties; system interconnection; Capacitance; Circuit faults; Fault currents; Grounding; Hybrid power systems; Impedance measurement; Protection; Protective relaying; Resistors; Synchronous generators; Directional ground fault relays; ground fault directional elements; hybrid generator grounding; sequence impedance measurements;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/TIA.2006.889899

Filename

4132866