Introduction  In the freezing rain and snow climate environment, it is necessary to heat the transmission line to strengthen its ability of resisting accident caused by snow and ice disaster. DC ice-melting device has been using widely and effectively current years.

  Method  This paper aimed to establish a feasible and meaningful technology to solve the problem of DC ice-melting device which adopted two independently sets of ice melting equipment, doubled the O & M cost, had worse economy, and need more investment and floor space. Wherefore, this paper proposed a feasible method which a main circuit topology of new model ice-melting device used for ice-melting and snow on both phase wire and ground wire, then it was introduced in this essay.

  Result  The results we obtained prove that this technique is feasible and effective.

  Conclusion  This technology provides great significance for further study on solving the problem of snow and ice overage on phase wire and ground wire, in reducing the investment on DC ice-melting device and in improving the capability of transmission system to resist the natural disaster.