Rating of cables on riser poles, in trays, in tunnels and shafts-a review

Author

Anders, George J.

Author_Institution

Ontario Hydro Technol., Toronto, Ont., Canada

Volume

11

Issue

1

fYear

1996

fDate

1/1/1996 12:00:00 AM

Firstpage

3

Lastpage

11

Abstract

This paper reviews rating of cables installed in air. The following cable installations are investigated: (1) cables on riser poles, (2) cables in open and closed trays, (3) cables wrapped in fire protection covers, (4) cables in horizontal tunnels, and (5) cables in vertical shafts. The rating of cables in these installations is computed by solving energy balance equations for the unknown surface temperature with a given conductor current. In ampacity computations the conductor current is adjusted iteratively until permissible cable conductor and surface temperatures are achieved. It is shown in the paper how the same energy balance equations can be used to compute the ratings of all the above cable installations

Keywords

cable sheathing; electric conduits; flameproofing; power cables; ampacity computations; cable ratings; cable shafts; cable trays; cable tunnels; closed trays; conductor current; energy balance equations; fire protection covers; horizontal tunnels; open trays; riser poles; unknown surface temperature; vertical shafts; Cable insulation; Conductors; Equations; Fires; Heat transfer; IEC standards; Protection; Shafts; Temperature dependence; Underground power cables;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.483996

Filename

483996