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On Necessity of Taking into Consideration Arc Resistance at Simulation Switching Transients in Electric Power Systems

T. Lazimov, E. Saafan

This paper presents results of research an influence of arc resistance in circuit-breakers on transitional processes have taken place at switching-offs capacitive and small inductive currents by vacuum and SF6 circuitbreakers. Simulation models include the main characteristics of circuit-breakers such as chop current, dielectric strength restoration law and switching duration. Simulations were carried out using methods and simulation parameters provided stable solutions for transitional functions of voltages and currents. Results obtained proved expediency taking into consideration the arc resistance at modeling and computer simulation of processes under consideration at least for switching-off small inductive currents by SF6 circuit-breakers and capacitive currents by vacuum circuit-breakers.