DOUBLE-SUBRANGE REACTOR-THYRISTOR DEVICE ON LOW VOLTAGE SIDE OF TRANSFORMER SUBSTATION Russian patent published in 2024 - IPC H02M5/25 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to electric power systems, and can be used to stabilize three-phase voltage on the low-voltage side of a transformer substation of all branches of the power supply system. As a result of the set task solution, the power supply system energy indices will be improved both in stationary and dynamic modes of its operation, as well as improvement of operation reliability. Besides, as in the prototype, accuracy of voltage regulation is increased, absence of electric arc, switching losses and overvoltages, as well as current surge on windings of power transformer and on load when it is necessary to regulate voltage under load. Technical result of the claimed invention is achieved due to the fact that between the input and output terminals in series-parallel to the main modules and parallel to the additional modules of thyristor switches there are three-phase main and additional reactors. Main and additional reactors connected directly to each other in series are connected through a three-phase contactor to common points of connection of inputs of the main and additional modules of thyristor switches and to points of connection of outputs of additional module of thyristor switches. Input terminals are connected via three-phase switch to secondary winding of power transformer, where its primary winding is connected to three-phase network, and output terminals are directly connected to buses of distributing device of transformer substation. Expedient field of application of the proposed device is transformer substations of all branches of the power supply system with voltages of 35/(10-6) kV and (10-6)/0.4 kV and their deviations in a narrow range.

EFFECT: maintaining quality of electric power at the specified level at different levels of supply mains voltage and (or) load current.

1 cl, 1 dwg