Short tail lightning impulse behaviour of medium voltage line insulation

Author

Carrus, A. ; Cinieri, E. ; Fumi, A. ; Mazzetti, C.

Author_Institution

Rome Univ., Italy

Volume

14

Issue

1

fYear

1999

fDate

1/1/1999 12:00:00 AM

Firstpage

218

Lastpage

226

Abstract

Insulation failure in medium voltage (10-20 kV) and electric traction lines (3 kV DC) is mainly due to indirect and direct lightning strokes to the lines. The overvoltages stressing the insulation have an impulse shape with a very short tail, much shorter than the standard 1.2/50 μs wave. The paper presents the results of experimental tests performed with a 1.2/4 μs wave, on air gaps and insulators in use in the lines under consideration. The flashover probability distributions and the voltage-time to breakdown characteristics under 1.2/4 μs waves determined are presented and compared with the 1.2/50 μs

Keywords

flashover; impulse testing; insulation testing; lightning; overvoltage; power transmission lines; probability; 1.2 mus; 10 to 20 kV; 3 kV; 4 mus; 50 mus; air gaps; flashover probability distributions; insulation breakdown tests; insulation failure; insulators; medium voltage line insulation; overvoltage stress; short tail lightning impulse behaviour; voltage-time to breakdown characteristics; Air gaps; Breakdown voltage; Dielectrics and electrical insulation; Insulator testing; Lightning; Medium voltage; Performance evaluation; Shape; Surges; Tail;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.736725

Filename

736725