Abstract
In high voltage networks for the transport of electrical energy, lightning, a phenomenon as dangerous as it is impressive, with an easily recognizable form, can affect a power line by striking either a phase conductor, a tower or a guard cable, thus causing more dangerous and constraining stresses on the lines for its proper operation. Thus, this article aims to analyze the behavior of a HV line during an atmospheric discharge and assess the spatial and temporal distribution of the lightning current wave. For this purpose, the generalities on the transmissible power in case of link without resistance and the modeling of the atmospheric surge propagation established on the basis of the theory of the lines with distributed constants implementing the wave equation known as the Alembert equation have been developed. Through this research, we are interested in the study of the space-time distribution of the lightning current wave in order to model the radiated electromagnetic field and to examine the influence of the atmospheric discharge induced overvoltage on the transportable power of a High Voltage AC Transmission line, for a good selective protection in order to illuminate the parasites. The 2D simulation based on engineering and “Transmission Line” models have been developed as well as the verification of the coherence of the different models, by comparing the fractal dimensions of the program results with those of the experimentally obtained figures.
Highlights
This article aims to analyze the behavior of a HV line during an atmospheric discharge and assess the spatial and temporal distribution of the lightning current wave
In the case where the lightning current is characterized by the following parameters Io = 10 kA
At the end of our work we analyzed the behavior of a HV line during an atmospheric discharge and evaluated the spatio-temporal distribution of the lightning current wave
Summary
By order of priority and rate of impact in the classes of constraint, lightning represents the unpredictable natural phenomenon and the most harmful on all electro-energetic systems [5] and if we can affirm that nowadays, the energy transporters control adequately the protection of the network against the internal accidental defects, it is not the case for its protection against lightning, especially during an indirect impact where it radiates important electromagnetic fields and which will induce by electromagnetic coupling cruel surges in their targets, in particular the electric power transmission networks [6]. The major concern today for both operators and consumers and the transmission of energy whose main element is the power line is to control the parameters of the transmission, especially in alternating current, to ensure stability, increase efficiency and illuminate the parasites for a good selective protection [10]. Given the complexity of the study of the parameters of a line and given that the number of its parameters introduced several unknowns; we are limited to the study of the fluctuations of the transportable power for a compensated inductive line in order to approach the reality
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