Influence of harmonics on power distribution system protection

Author

Fuller, J.F. ; Fuchs, E.F. ; Roesler, D.J.

Author_Institution

Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA

Volume

3

Issue

2

fYear

1988

fDate

4/1/1988 12:00:00 AM

Firstpage

549

Lastpage

557

Abstract

The effects of nonsinusoidal voltages and currents on the performance of static underfrequency and overcurrent relays are experimentally studied. The tests were conducted in such a way that the frequency, amplitude and phase shift of individual harmonics could be adjusted in a controlled manner by using a waveform generator with a phase-locking circuit. The relationship between the harmonic currents and voltages was modeled in terms of the power system impedance within residential distribution systems. It was found that for harmonic voltage and current amplitudes (as they occur in distribution systems), underfrequency relays and the time delay operation of overcurrent relays show a marked deterioration in performance. The instantaneous operating characteristics of overcurrent relays, however, are hardly affected by the presence of harmonic currents

Keywords

distribution networks; harmonics; overcurrent protection; power system protection; relay protection; amplitude; distribution networks; frequency; harmonics; overcurrent relays; performance; phase shift; phase-locking circuit; power distribution system protection; power system impedance; power system protection; relay protection; residential distribution systems; time delay operation; underfrequency relays; waveform generator; Circuit testing; Frequency; Power distribution; Power system harmonics; Power system modeling; Power system protection; Power system relaying; Protective relaying; Signal generators; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.4292

Filename

4292