The arc voltages of scrap melting arc furnaces are subject to considerable random fluctuations. These lead to adverse effects on the furnace operation. Electric melting power is reduced by fluctuations. Furthermore, arc fluctuations also inject disturbances into the power supply network and cause electromechanical stress within the high-current system. Theoretical calculations, simulations and data recorded at production furnaces show that higher short-circuit reactances reduce the adverse effects of electrical fluctuations. The furnace transformer voltage has to be increased to compensate for the higher voltage drop over a higher short-circuit reactance.
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