Numerical prediction of HVDC wall bushing flashover caused by uneven wetting

Author

Tang, L. ; Raghuveer, M.R.

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

2

fYear

1996

fDate

20-23 Oct 1996

Firstpage

455

Abstract

In this paper, a numerical model is developed to determine the critical flashover voltage of an unevenly wetted HVDC wall bushing, The electric field of a 600 kV HVDC wall bushing is calculated by using the Finite Element Method, and the E-field distribution, particularly that along the critical line, is used to determine the critical flashover voltage (CFO). The simulation results show that predicted critical flashover voltages agree well with experimental data in literature. Furthermore, various aspects of uneven wetting flashover phenomena are verified. The influence of the dry zone length, rain conductivity, air pressure as well as altitude on the critical flashover voltage are also investigated using the developed model. The results presented in this paper suggest that the proposed E-field based model is an effective-tool to evaluate the performance of an HVDC wall bushing

Keywords

HVDC power transmission; bushings; electric fields; finite element analysis; flashover; wetting; 600 kV; E-field distribution; HVDC wall bushing; air pressure; critical flashover voltage; dry zone length; finite element method; rain conductivity; uneven wetting; Conductivity; Dielectrics and electrical insulation; Earth; Finite element methods; Flashover; HVDC transmission; Insulators; Predictive models; Rain; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on

Conference_Location

Millbrae, CA

Print_ISBN

0-7803-3580-5

Type

conf

DOI

10.1109/CEIDP.1996.564508

Filename

564508