Pipe-type cable ampacities in the presence of harmonics

Author

Palmer, J.A. ; Degeneff, R.C. ; McKernan, T.M. ; Halleran, T.M.

Author_Institution

Rensselaer Polytech. Inst., Troy, NY, USA

Volume

8

Issue

4

fYear

1993

fDate

10/1/1993 12:00:00 AM

Firstpage

1689

Lastpage

1695

Abstract

This paper explores the effect of harmonics on high-pressure fluid filled pipe-type transmission cable ampacity. Industry currently calculates the current carrying capacity of underground power cable based on the assumption of a purely sinusoidal 60 Hz current. However, increasing levels of harmonics on power systems have raised concern about their effect on cable ampacities. The issue has already been addressed for distribution cables. This paper begins with a discussion of Neher and McGrath´s classic equations and some recent revisions, and develops a closed form composite equation accurately reflecting the effect of harmonics. The effect of frequency on the loss ratio is shown and supported by comparison with measured data at 60 Hz and a finite element analysis at a number of harmonic frequencies. The effect of specific harmonic scenarios is shown in light of the IEEE standard on harmonics. The results are used to develop a derating factor to compensate for current harmonics on transmission systems

Keywords

finite element analysis; power cables; power system harmonics; transmission networks; underground cables; 60 Hz; IEEE standard; ampacity; closed form composite equation; compensation; finite element analysis; frequency; loss ratio; pipe-type transmission cable; power system harmonics; transmission systems; underground power cable; Equations; Finite element methods; Frequency measurement; Harmonic analysis; Helium; Loss measurement; Power cables; Power system harmonics; Senior members; Student members;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.248274

Filename

248274