Shunt reactors are used in the power grid system, to inhibit the end line voltage rise for the line capacity reactive in the transmission lines of light load. The connection of the shunt reactor can reduce the potential supply current of the system earthing fault, which is useful to eliminate the self -excitation of the generator. For the large capacity, the resin cast reactors are usually single phase reactor, form three phase reactor by three piece of single phsde reactors. The shunt reactor core developed by CNEKE, is made of the radial overlapping silicon steel, discoil overall vacuum cast molding, and therefore has the features of accurancy resistance value, low loss, solid structure, low noise level.