Title :
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
fDate :
4/1/2003 12:00:00 AM
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;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2003.809683
