Introduction  After the ice disaster， in order to ensure the safety and reliability of power supply of the power grid， it is necessary to repair or rebuild the power grid in the disaster-stricken area to meet the requirements of power grid safety and reliability. However， the power grid facilities involved are restricted by external factors and can fully meet the requirements of regulations and specifications. Ice disasters on double-circuit towers will increase the difficulty of power grid repair or reconstruction. In order to minimize the static and dynamic load of the tower after ice disaster， the paper proposed to directly reduce the number of sub-conductors to improve the overall ice resistance of the tower.

  Method  In combination with the existing 500 kV double circuit project on the same tower， after an ice disaster occured， one circuit was removed and the ice accident section was bypassed by a new single circuit， and the other circuit was connected to the original double circuit six-circuit cross-arm through each cross-arm with two sub-conductors. Each two cross-arms constituted a loop arrangement to be modified.

  Result  The results we obtained demonstrate that this proposed scheme can not only improve the ice resistance of the main inclined material of the tower， but also greatly improve the ice resistance of the cross arm and meet the requirements of the differentiated design of the State Grid.

  Conclusion  Two-split conductors with small cross-sections will cause changes in electrical performance. Our data suggests that such changes are considered acceptable in areas with high forest coverage， complex terrain， and poor visibility conditions.