Experimental investigation into harmonic impedance of low-voltage cables

Author

Du, Y. ; Burnett, J.

Author_Institution

Dept. of Building Services Eng., Hong Kong Polytech. Univ., China

Volume

147

Issue

6

fYear

2000

fDate

11/1/2000 12:00:00 AM

Firstpage

322

Lastpage

328

Abstract

Harmonic characteristics of power cables used in low-voltage distribution systems of commercial buildings are investigated. Analytical discussion of cable resistance and reactance at harmonic frequencies is presented. An experimental procedure for obtaining full matrix impedance of cables at harmonic frequency is introduced. It is found that cable resistance increases with increasing harmonic order. Cable inductance, however, decreases due to the effect of flux cancellation. The analytical formulas presented yield reasonable accuracy for cable resistance for single-core cables, but provide an overestimation for multicore cables. The impact of various parameters on cable resistance and reactance, such as harmonic order, cable installation method, cable current distribution and the presence of magnetic material is also addressed, as well as the mechanisms for impedance variation. Finally, recommendations for using the approximate formulas for cables in low-voltage installations are provided

Keywords

electric reactance measurement; electric resistance measurement; inductance measurement; power cables; power distribution lines; power system harmonics; cable current distribution; cable inductance; cable installation method; cable reactance; cable resistance; commercial buildings; flux cancellation; harmonic frequencies; harmonic impedance; harmonic order; low-voltage cables; low-voltage distribution systems; magnetic material; matrix impedance; multicore cables overestimation; single-core cables;

fLanguage

English

Journal_Title

Generation, Transmission and Distribution, IEE Proceedings-

Publisher

iet

ISSN

1350-2360

Type

jour

DOI

10.1049/ip-gtd:20000653

Filename

894392