Abstract: The process of burning down the phase-controlled dry air-core reactor for 66kV SVC in Lishizhai substation was introduced, and the cause of the burning of the dry air-core reactor was demonstrated and analyzed. The method of elimination was used to find out the design. In the manufacturing process, there are quality problems in the insulation of the coil, resulting in a short circuit between the turns, resulting in a large area burned. In order to avoid the recurrence of such accidents, it is necessary to strengthen the induction and withstand voltage test of the delivery and delivery.