The widespread applying of electrical grids with voltage classes 330 and 750 kV with powerful units of nuclear and heat power plants creates a set of problems with normal modes ensuring in the Ukrainian energy system. Due to sufficiently great transverse capacitance of such overhead lines, significant amounts of reactive power excess are possible in the system. This phenomenon manifests itself especially in the load reduction hours in the power system through the visible voltage levels deviation at the energy-generating nodes in an upward direction.
The current state of the energy system of Ukraine is characterized by extensive use power lines with voltage classes of 330 and 750 kV. The charging power of such lines is quite significant, which generates significant amounts of reactive power in the network, which manifests itself especially in the hours of reducing the load in the power system with significant increases in voltage levels. Excess reactive power affect the modes of excitation regulators of synchronous generators narrowing their working range.