With the large-scale operation of the smart substation, the construction of the smart substation is constantly advancing. Due to the lack of a complete technical system for the smart substation expansion and expansion technology, in order to solve the scope of influence and reconstruction and ensure that the reconstruction and expansion interval does not affect the operation interval information, this paper proposes an automatic identification interval information based on the secondary virtual loop to assign the secondary device to the interval. At the same time, the secondary loop configuration management based on bay CRC is proposed, and the interval of influence on the protection of the busbar protection is clearly defined. Finally, a method based on semantic recognition is proposed to verify the secondary virtual circuit of CCD to ensure the correctness of virtual circuit configuration, provide technical support for the reconstruction and expansion of intelligent substation, and improve the efficiency of reconstruction and expansion. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 521200170027).