A study on the profile of HVDC insulators-mathematical modeling and design considerations

Author

Cheng, T.C. ; Nour, H.I.M.

Author_Institution

Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA

Volume

24

Issue

1

fYear

1989

fDate

2/1/1989 12:00:00 AM

Firstpage

113

Lastpage

117

Abstract

The effects of underrib configuration on the flashover voltage of contaminated HVDC (high-voltage direct-current) insulators are analyzed. Mathematical models are developed to characterize the behavior of multiple discharges sustained along a contaminated surface. The effectiveness of the insulator leakage length is investigated by predicting the discharge path between neighboring underrib tips. An empirical equation is developed to estimate the effectiveness of the creepage length of a profile segment in terms of its physical dimensions. It is confirmed that the effective leakage length as a direct influence on the critical flashover voltage. A method for application of the effectiveness of the insulator leakage length for profile design considerations has been developed. The method yields the optimum number of underribs required for a given insulating space

Keywords

DC power transmission; flashover; high-voltage techniques; insulators; leakage currents; HVDC insulators; contaminated surface; creepage length; critical flashover voltage; design; discharge path; effectiveness; leakage length; mathematical modeling; multiple discharges; profile; underrib configuration; Dielectrics and electrical insulation; Equations; Flashover; HVDC transmission; Helium; Mathematical model; Shape; Surface contamination; Surface discharges; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.19875

Filename

19875