Parametric analysis of lightning stroke incidence to HV transmission line towers

Abstract

SUMMARYA parametric analysis of lightning stroke incidence to high voltage (HV) transmission line towers is presented in this paper. It is based on a mathematical model that accounts for the transmission line geometry, keraunic level, statistical distribution of lightning current parameters and correlation between statistical variables defining the lightning current waveshape. Theoretical analysis is backed by the most recent propositions of parameters that define statistical distributions and then applied to the typical HV transmission line example. The results provide insight into the selection procedure for the lightning current parameters (i.e. amplitude, front duration, wave duration and polarity) associated with lightning stroke incidence to transmission line towers. This selection procedure could be applied in backflashover analysis as well as in the analysis (and design) of HV transformer station overvoltage protection.

Reconsidering insulation coordination and simulation under the effect of pollution due to climate change

“…Such an overvoltage does not have a decisive role in determining the number of insulators compared with the overvoltage caused by lightning or switching. However, these calculations should be used to determine the minimum air gap between conductor and the tower body at the maximum variations in insulator chain . Determining the class and degree of pollution in the region where transmission lines are located is of paramount importance, because the pollution class plays a direct role not only in choosing the type and number of insulators but also in determining conductors used in lines (to prevent corrosion of wires).…”

Magnetic field of a ribbon busbar of finite length

“…1), i.e. the conductor of rectangular section for which b>>a, the magnetic field generated by the direct current or slow alternating sinusoidal current I at any point X(x,y,z) is determined much easier than in case of rectangular bus [1,2], because the result is obtained after single integration [1]. However, if we already have solutions of studies [1,3] at our disposal, then we can determine the magnetic field components through determination of limits of these functions when the crosswise dimension of the busduct is a0.…”