| Summary: | The article presents the susceptibility coefficients active power <i>k<sub>p</sub></i> and reactive power <i>k<sub>q</sub></i>, as proposed by the author. These coefficients reflect the reaction of arc furnaces (change of the furnace operating point) to supply voltage fluctuations. The considerations were based on the model of the arc device in which the electric arc was replaced with a voltage source with an amplitude dependent on the length of the arc. In the case of voltage fluctuations, such a model gives an assessment of the arc device’s behavior closer to reality than the model used, based on replacing the arc with resistance. An example of the application of the <i>k<sub>p</sub></i> and <i>k<sub>q</sub></i> coefficients in a practical solution is presented.
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