Abstract
• Lightning performance of 230- and 500 kV TL is assessed by computational simulations. • Technical-economic analysis of techniques to improve lightning performance is shown. • Installation of extended counterpoise wires and underbuilt wires is considered. • Decrease of 88%–94% in BFOR is obtained with the use of underbuilt wires. • Underbuilt wires are economically viable mainly for high resistivity soils. A stopping criterion to be applied on Monte Carlo-based computational simulations of the lightning performance of transmission lines in terms of backflashover is proposed. Considering typical 138 kV and 230 kV transmission lines as case studies and the application of an elaborated probabilistic calculation approach, the influence of the number of iterations of the Monte Carlo simulation on the calculated critical current, backflashover probability, error of the distribution and the dispersion coefficient is assessed. The obtained results leaded to the proposed stopping criterion that establishes limits for the error (5%) and the dispersion coefficient (0.35). Its application yields consistent results with the decrease on the number of required iterations up to 95% and higher than 90% for simulations related to the 230 kV and 138 kV TLs, respectively, when compared to simulations of reference with 20000 iterations.
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