A special-case surface voltage gradient formula [for substation design]

Author

Larsson, A.

Author_Institution

Swedish Transmission Res. Inst., Ludvika

Volume

11

Issue

4

fYear

1996

fDate

10/1/1996 12:00:00 AM

Firstpage

1771

Lastpage

1775

Abstract

In the electrical design of a high-voltage substation, the designer needs a simple and reliable tool, preferably a closed-form formula, when calculating the surface voltage gradient of line segments within the substation since the surface voltage gradient is the governing parameter of the corona performance. This paper presents a derivation of a closed-form formula for calculation of the maximum surface voltage gradient of a special line configuration, namely a horizontal AC three-phase line configuration with bundle conductors consisting of three sub-conductors in a horizontal arrangement. The formula has been verified against exact calculations and was found to have an error less than 5% for all practical combinations of the conductor radius, the sub-conductor spacing, the phase distance, and the height above earth

Keywords

corona; design engineering; power transmission lines; substations; transmission line theory; voltage distribution; bundle conductors; closed-form formula; conductor radius; corona performance; electrical design; high-voltage substation; horizontal AC three-phase line; line segments; phase distance; sub-conductor spacing; sub-conductors; surface voltage gradient formula; Conductors; Corona; Earth; Electromagnetic interference; Image converters; Image segmentation; Performance loss; Substations; Surface discharges; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.544256

Filename

544256