Patent ID: 11935691
Assignee: HITACHI ENERGY LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC H

Claim 8:
9. A method for controlling a tap changer included in a transformer assembly for electric grids, said transformer assembly comprising:
an electric transformer comprising a magnetic core, a first side including one or more first windings enchained with said magnetic core and adapted to be electrically connected to a first grid section and a second side including one or more second windings enchained with said magnetic core and adapted to be electrically connected to a second grid section, the first side and the one or more first windings forming a primary side and primary windings of the electric transformer, and the second side and the one or more second windings forming a secondary side and secondary windings of the transformer; and
a tap changer operatively associated with said electric transformer to vary the number of turns enchained with said magnetic core for said one or more first windings,

the method comprising:
acquiring input data indicative of an electrical connectivity condition of said second grid section with said second windings;
basing on said input data, determining whether said transformer is in a load condition or in a no-load condition; and
if said transformer is in a no-load condition, commanding said tap changer to set a maximum available number of turns for said one or more first windings.