CONNECTION METHOD OF POWER TRANSFORMER AND MAINTENANCE OF SUBSTATION Russian patent published in 2020 - IPC H02B1/24 H02J11/00 

FIELD: electricity.

SUBSTANCE: invention relates to electric power industry, to inclusion of power transformers and their servicing at electric power substations. Technical result is in reliability increasing. Method of power transformer switching and substation maintenance is performed by connection of primary winding of power transformer directly to electric power source after synchronization, low power transformer is introduced into the circuit, the primary winding of which is connected to the electric power source, and the secondary (R) inductive (L) RL circuit is connected to the secondary winding of the power transformer through the resistor (R). Synchronization device performs synchronization of voltages on side of primary winding of power transformer and electric power source. Three-winding low-power transformer is introduced into the circuit to feed load of auxiliary needs of substation: auxiliary ones, own control and service devices, in which one secondary winding of transformer is used to reduce starting currents through oscillatory circuit of RL-circuit. Additional secondary winding of the transformer is used to supply consumers of own administrative needs and to preventive maintenance of the main equipment of the substation. In process of preventive maintenance of power transformer or low-power transformer with circuit of RL-circuit load of auxiliary needs of substation is supplied from equipment in opposite order through three-winding transformer of low power or step-down transformer of auxiliary needs.

EFFECT: technical result is improvement of reliable operation of transformer substation.

1 cl, 2 dwg