Lightning flashovers on 77-kV systems: observed voltage bias effects and analysis

Author

Ito, Takamitsu ; Ueda, Toshiaki ; Watanabe, Hideto ; Funabashi, Toshihisa ; Ametani, Akihiro

Author_Institution

Meidensha Corp., Tokyo, Japan

Volume

18

Issue

2

fYear

2003

fDate

4/1/2003 12:00:00 AM

Firstpage

545

Lastpage

550

Abstract

Twenty-nine backflashovers were recorded on a 77-kV double-circuit transmission line with single overhead groundwire. Twenty-six of these occurred on phases where power-frequency voltage bias was positive. EMTP analysis of the line shows that the multistory tower model, recommended by the Japanese Guideline of Insulation Design/Coordination against Lightning, suggests a stronger influence of phase position than was observed. Best simulation results were obtained with a simple tower model of constant surge impedance.

Keywords

EMTP; digital simulation; flashover; poles and towers; power overhead lines; surges; 77 kV; EMTP analysis; Japanese Guideline of Insulation Design/Coordination; backflashovers; constant surge impedance; double-circuit transmission line; lightning flashovers; multistory tower model; phase position; positive power-frequency voltage bias; single overhead groundwire; summer lightning; transient analysis; voltage bias effects; EMTP; Flashover; Guidelines; Insulation; Lightning; Poles and towers; Power overhead lines; Power system modeling; Power transmission lines; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2003.809683

Filename

1193876