Equal-potential Entering Path and Arc Energy Calculation Method for Live Working on ±800kV DC Transmission Line Based on FEM

In order to ensure the reliability of safety protection during equal-potential transfer, it is necessary to study the potential transfer current and arc energy of the +/- 800kV UHVDC transmission line. For the purpose, an arc energy circuit model and a calculation model were built. FEM was used to calculate the relationship between human potential, different transfer distances, suspension potential gap capacitance and potential transfer arc energy under three equal-potential entering Paths. According to the calculation, when entering the pole conductor from below, the potential will be the lowest, and the potential transfer arc energy is the maximum among the three ways. When entering the pole conductor from above, it will have the highest potential and the minimum energy of potential transfer arc. The calculation method and results can be used as a reference for the selection of equal-potential entering path and the design of safety protective equipment of the +/- 800kV HVDC transmission line during live working programs.