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Lightning induced voltages on aerial and underground lines depend on the ground resistivity. Most calculating methodologies were developed considering the ground as a homogeneous medium. However, actual ground is better represented if stratified into horizontal layers of different resistivity values. This paper proposes the use of a simplified expression for the calculation of the equivalent resistivity...
This paper presents an approximate formula for the peak value of lightning-induced voltages in an overhead line, considering the ground resistivity and a trapezoidal lightning return stroke current waveform with typical parameters 3.8-μ s front time and 120-m/μ s velocity. It presents an improvement in a formula previously proposed by the authors. The formula is used with a probabilistic approach,...
The estimation of overhead distribution lines lightning performance is very important for insulation design. Due to the random nature of lightning, different aspects of the phenomenon, such as the discharge points of incidence and the statistical distribution of the current intensity, are modeled in performance evaluation studies. This paper presents a comparative study of different models proposed...
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