The theme of Master project of Energetics engineer is to analyze the damage of the sags and the dips of the voltage to going concerns, to find the ways of avoiding the sags and the dips of the voltage and to improve the quality of the electric power. The graphs which are included show the sags and the dips of the voltage. Some of the ways to avoid it are included also. An example introduces the best way how to supply the electric power without the sags and the dips of it.