Dynamic thermal rating of power lines – improved model and measurements in rainy conditions

Summary

The transfer capabilities of over-head power lines are often limited by the critical power line temperature that depends on the magnitude of the transferred current and the ambient conditions, i.e. ambient temperature, wind, precipitation, etc. To utilize existing power lines more effectively and more safely with regards to the critical power line temperatures and to enforce safety measures during potentially dangerous events the dynamic assessment of thermal rating is required. In this paper a Dynamic Thermal Rating model that covers most important weather phenomena, with special emphasis on rain, is presented. The model considers a dynamic heat generation within the conductor and heat exchange with the surrounding. The model is validated by comparison of skin and core temperature with measurements under realistic environmental conditions.

Additional informations

Authors

TU, CHENG

Keywords

Dynamic Thermal Rating; Transmission lines; Numerical model; Rain; Measurements