Cable crossings-derating considerations. II. Example of derivation of derating curves

Author

Anders, George ; Brakelmann, Heinrich

Author_Institution

Ontario Hydro, Toronto, Ont., Canada

Volume

14

Issue

3

fYear

1999

fDate

7/1/1999 12:00:00 AM

Firstpage

715

Lastpage

720

Abstract

For pt.I see ibid., vol.14, no.3, p.705-14 (1999). Cables crossing other heat sources either perpendicularly or at oblique angles will experience a rise in conductor temperature which should result in ampacity derating. In the first part of the paper a mathematical model for calculation of derating factors was presented. In this paper, a practical numerical example is considered with a 138 kV pipe-type cable crossing a 10 kV distribution circuit. The numerical analysis presented confirms experimental findings reported in the literature that the cable crossing may elevate conductor temperature by as much as 20°C

Keywords

power cables; power distribution lines; 10 kV; 138 kV; ampacity derating; cable crossings; derating considerations; derating curves derivation; distribution circuit; oblique cable crossing; perpendicular cable crossing; pipe-type cable; Cable shielding; Conductors; Dielectric losses; Dielectrics and electrical insulation; Oil filled cables; Power cables; Thermal conductivity; Thermal factors; Thermal loading; Thermal resistance;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.772305

Filename

772305