Specification of the Method for Calculating the Long-Term Permissible Current of Overhead Line Conductors

The permissible current load of power lines is determined by thermal calculation. The article provides an assessment of the existing methodological approaches to the thermal calculation of non-insulated overhead line conductors in terms of determining the current at the maximum permissible value of the conductor temperature. The use of a particular approach currently depends solely on the preferences of a particular specialist. The long-term permissible current includes a large number of parameters of the mathematical model. The article proposes an updated model of the long-term permissible current of overhead lines. The influence of factors and parameters of the mathematical model for calculating the long-term permissible current on the calculation result is shown.