A practical protective relay for down-conductor faults

Author

Jeerings, D.I. ; Linders, J.R.

Author_Institution

Nordon R&D Inc., Plant City, FL, USA

Volume

6

Issue

2

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

565

Lastpage

574

Abstract

A practical relay for detecting down-conductor high-impedance ground faults (HIGF) is described, with supporting theory and data from live line tests. The use of the third-harmonic current magnitude and the phase relation to the system voltage is shown to provide useful information for detecting this type of fault. By suppressing ambient harmonics and utilizing only the change in the harmonics, a fault current sensitivity of 1% of the feeder rating is shown to be feasible. Fault detection concepts include harmonic phase sequence components in the three-phase unit. Relays for both single-phase laterals and three-phase circuits are described. Redundant measurement techniques in both versions are shown to enhance the reliability of the system and to contribute to the feasibility of the noted sensitivity

Keywords

electrical faults; relay protection; ambient harmonics; down-conductor faults; fault current sensitivity; feeder rating; high-impedance ground faults; protective relay; reliability; third-harmonic current magnitude; Circuit faults; Electrical fault detection; Fault currents; Fault detection; Phase detection; Protection; Protective relaying; Relays; Testing; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.131113

Filename

131113