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Improving Adequacy of Simulation Transitional Processes in Electric Systems by More Comprehensive Consideration Phenomena in Circuit-Breakers

Computer simulation is the main tool for studying transitional processes in electric power systems including switching transitions of high-voltage system’s equipment such as transformers and autotransformers, power capacitor banks, power transmission lines etc. In this regard ensuring adequacy of the models and methods used becomes very important. In general the satisfactory adequacy of computer simulation can be reached by two principal ways. One of them is comprehensive consideration of all the physical phenomena might have notable influence on the process under consideration. For the problem under study these are chopping of switched-off current and arcs’ repeated re-strikes and re-ignitions in circuit-breakers, arc resistance etc. Another one is providing stability of transitional functions of voltages and currents due to use appropriate ode solvers and algorithms and also simulation parameters ensuring convergence of solutions. The paper presents results of investigation influence of arc resistance and inertia of current chopping process (slope of chop current) on functions of transitional voltages at switching-off unloaded transformer and unloaded power transmission line by SF6 and vacuum circuit-breakers. The research curried-out allowed us to estimate influence of arc resistance and inertia of the current chopping process on transitional voltages. There was done quantitative estimation of transitional voltages deviations conditioned by ignoring of the phenomena of arc and the gradual decline of the chop current in the circuit-breaker.