Self-adaptively grounded lightning wire deicing topology

The invention discloses a self-adaptively grounded lightning wire deicing topology. The topology comprises a controllable current source, a disconnector, a direct current sensor, and two direct current control contactors and two lightning wire insulators arranged on each tower. The controllable current source is connected with the head end of the lightning wire through the disconnector, the tail end of the lightning wire is short-circuited, and the short-circuited point is provided with the direct current sensor; coils of the direct current control contactors are connected in series with the lightning wire; one end of a main contact is connected with the lightning wire, while the other end is grounded through the tower; and one end of each lightning wire insulator is connected with the lightning wire, while the other end is grounded through the tower. The topology makes the lightning wire reliably grounded at ordinary times, and supplies direct current to the lightning wire during deicing so as to make the lightning wire automatically ungrounded; and the topology can periodically test the direct current control contactors when the lightning wire is not coated with ice, so that the topology is convenient and reliable to operate. The invention provides a safe, high-efficiency, convenient and reliable method for solving the problem of controlling the deicing of the grounded lightning wire.