Title :
Monte Carlo evaluation of the impact of subsequent strokes on backflashover rate
Author :
Gatta, F.M. ; Geri, A. ; Lauria, S. ; Maccioni, M.
Author_Institution :
Dept. of Astronaut., Electr. & Energetics Eng., “Sapienza” Univ. of Rome, Rome, Italy
Abstract :
The paper deals with the impact of subsequent strokes on the backflashover rate (BFOR) of HV overhead transmission lines (OHLs), assessed by means of an ATP-EMTP Monte Carlo procedure. The application to a typical 150 kV Italian OHL is discussed, simulating three different tower grounding system arrangements. Subsequent strokes parameters are added to the statistical simulation variables: peak current, front time, time-to-half value, lightning polarity, line insulation withstand, lightning location and phase angle of the power frequency voltage. The input data are fed to an ATP-EMTP circuit model of the OHL, including line insulation, lightning representation and tower grounding system, the latter simulated by a pi-circuit model able to simulate the effects due to propagation and soil ionization. Numerical results evidence a non-negligible BFOR increase for the simulated, spatially concentrated grounding systems due to subsequent strokes, especially for low grounding resistances.
Keywords :
EMTP; Monte Carlo methods; earthing; flashover; poles and towers; power overhead lines; statistical analysis; ATP-EMTP; BFOR; Italian OHL; Monte Carlo evaluation; backflashover rate; front time variable; grounding resistance; lightning location; lightning polarity; lightning representation; line insulation; line insulation withstand variable; overhead transmission line; peak current variable; phase angle; pi-circuit model; power frequency voltage; soil ionization; spatially concentrated grounding system; statistical simulation variable; subsequent stroke impact; time-to-half value variable; tower grounding system; tower grounding system arrangement; voltage 150 kV; Conductors; Grounding; Insulation; Integrated circuit modeling; Lightning; Monte Carlo methods; Poles and towers; ATP-EMTP; HV overhead line; Monte Carlo; backflashover rate; grounding system; subsequent strokes;
Conference_Titel :
Environment and Electrical Engineering (EEEIC), 2015 IEEE 15th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4799-7992-9
DOI :
10.1109/EEEIC.2015.7165341
