Abstract
The paper presents the application of an ATP-EMTP Monte Carlo procedure for backflashover rate (BFOR) evaluations to HV overhead lines (OHL), equipped with three different types of spatially extended and/or geometrically involved tower grounding systems. The ATP-EMTP circuit model of the OHL includes detailed line insulation and lightning representation; grounding systems are simulated by a new and simplified model which reproduces the effects of propagation along the ground conductors and soil ionization phenomena. The statistical variables include lightning stroke parameters (polarity, peak current, front and tail times), lightning location, as well as line insulation withstand and phase angle of the supply voltage. An external software engine generates all the required statistically-oriented ATP-EMTP input data, sequentially launches and manages ATP simulations and finally post-processes the results. A good performance in terms of convergence and computation times is evidenced. Results are compared to those yielded by both the simplified and ‘complete’ CIGRE methods for backflashover rate calculations, showing the applicability of the proposed procedure to line configurations characterized by complex tower grounding arrangements.
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