Iron core excitation device and method for seeking and recovering breakdown range of pouring coil

The invention discloses an iron core excitation device and a method for seeking and recovering breakdown range of a pouring coil. The iron core excitation device is characterized in that a first ironcore post, a second iron core post, a third iron core post and a movable iron core post which have square cross sections form a closed magnetic path, a C-shaped structure is formed at overlap joints among the first iron core post, the second iron core post and the third iron core post by right-angle gaps repeatedly arranged in staggered way, an excitation coil is attached onto a coil wound from the third iron core post and is uniformly arranged along a length direction of the third iron core post, the turns of the excitation coil is in a way that cross section of the iron posts can normally run under rated voltage and normal magnetic flux density, and when the iron core excitation device is closed, contact surfaces between the movable iron core post and the first iron core post and betweenthe movable iron core post and the second iron core post are smoothly attached to form the iron core excitation device. The method is used for seeking a breakdown fault position among segments, layers and turns of an epoxy pouring coil, the complicated process of repeatedly disassembling and assembly a transformer is reduced, the fault position can be judged and recovered only by disassembling the fault coil in one time, and the qualified rate of the pouring coil is improved.