Taking the live operation of ±800 kV DC transmission line as an example

the capacitance model is improved

and the improved capacitance model considers the influence of another pole line. The capacitance parameters under the two models are calculated by finite element method

and the potential transfer current under different transfer distances is calculated based on the two models. The calculation results show that the change rule of transfer current with transfer distance calculated based on the two models is consistent. The transfer current calculated based on the improved capacitance model is larger than that calculated by the model before improvement. The research results can provide reference for the calculation of transfer current in live working of transmission lines.