Ampacity of Multi-Circuit Overhead Power Lines with Different Routes

The continuous current carrying capacity is related to continuous loading. Bare conductors in overhead power lines (OHL) are under atmospheric conditions. In this respect, the air temperature, wind speed, and solar potential of the region can play a role in increasing or decreasing the current carrying capacity. Due to the heat balance, similar to Kirchhoff's current law, the heat gained and lost by the conductor are equal. If a multi-circuit power line is on the same tower, the current carrying capacities are equal since the phases of each circuit are exposed to the same meteorological parameters. If the circuits of a multi-circuit power line are on separate towers and pass through different routes, in this case, each circuit will be affected by different meteorological parameters and the current carrying capacities will not be equal. In this article, the degree of asymmetry in the steady state current carrying capacity of each circuit in multi-circuit power lines passing through different routes is examined. Depending on the length and geographical features of the route, meteorological parameters in each line segment were taken into account instead of the average meteorological parameters along the line.