METHOD FOR CONTROLLED MELTING OF ICE ON OVERHEAD POWER LINES WITH ALTERNATING CURRENT Russian patent published in 2014 - IPC H02G7/16 

FIELD: electricity.

SUBSTANCE: invention can be used at high-voltage substations which require melting ice on wires of overhead power lines. Controlled melting of ice on overhead power lines is carried out with low-frequency current generated by a three-phase self-contained voltage inverter, and the effective melting current value is set and maintained at the required level by varying supply voltage of the inverter. Melting is carried out simultaneously on three wires of the overhead power line, which are connected to output terminals of the three-phase voltage inverter and shorted at the opposite end of the line. The line performs the function of a three-phase load of the inverter with Y phase connection.

EFFECT: minimising the number of switches needed to switch from the compensation mode to the controlled ice melting mode and back; longer allowable length of the overhead power line compared with controlled ice melting with alternating current at industrial frequency, easy organisation, shorter duration of the ice melting process, reduced amount of additional switching equipment.