Experimental study on surface flashover of a coaxial cable under nanosecond impulse voltage

Author

Han, Myungjin ; Lee, Sang-Rim ; Yang, Tao

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing

Volume

25

Issue

3

fYear

1990

fDate

6/1/1990 12:00:00 AM

Firstpage

583

Lastpage

586

Abstract

The flashover of the polyethylene surface of a coaxial cable is studied under nanosecond impulse voltage. The rise time of the applied voltage is 50 ns. The average impulse flashover voltage per unit length along an insulation length (D) of 5 to 15 cm is measured to be 6.5 to 3.5 kV/cm. The delay time of the flashover is in the range of 500 to 700 ns. The velocity of the propagation of discharge is measured to be (2±0.5)×10⁷ cm/s at D=12 cm. In order to compare with the DC values, the DC average flashover voltage for unit length is measured. It is 7.8 to 5.8 kV/cm for D=5 to 15 cm. The voltage time curves of the flashover along the polyethylene and a pressurized spark gap are also given

Keywords

cable insulation; coaxial cables; flashover; organic insulating materials; surface discharges; 50 ns; 500 to 700 ns; coaxial cable; delay time; insulation length; nanosecond impulse voltage; polyethylene surface; pressurized spark gap; rise time; surface flashover; voltage time curves; Coaxial cables; Delay effects; Flashover; Insulation; Length measurement; Measurement units; Polyethylene; Sparks; Velocity measurement; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.55735

Filename

55735