Patent ID: 11939949
Assignee: VESTAS WIND SYSTEMS A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A method of increasing a weight of at least one of a plurality of wind turbine blades configured to form a rotor of a wind turbine for balancing the rotor, the at least one wind turbine blade comprising a blade shell that extends in a spanwise direction from a root end of the wind turbine blade to a tip end of the wind turbine blade, the blade shell defining an internal blade volume within which a ballast tank is located, the method comprising:
applying an RF position-identification means to the ballast tank or to the at least one wind turbine blade at a position corresponding to the position of the ballast tank within the at least one wind turbine blade;
identifying the location of the ballast tank within the internal blade volume by:
generating, via the RF position-identification means, an RF position signal; and
detecting, at an RF detection means external to the at least one wind turbine blade, the RF position signal; and

determining the ballast tank position based on detection of the RF position signal;
drilling, forming and/or machining an opening into the blade shell at a location dependent on the identified location of the ballast tank; and
introducing a ballast material through the opening into the ballast tank.