A dynamic tracking approach to the temperature of overhead transmission lines based on electrical measurements

Temperature is an important factor that limits the current-carrying capability of overhead transmission lines. An online estimation approach is proposed in this study to dynamically track the temperature of transmission lines and thereby fully use their capability. In the proposed approach, the temperature is represented as a function of the transmission loss and current. A Kalman Filter model is set up to track the dynamic change of the temperature. The proposed approach uses only the accessible electrical measurements to form the estimation models and is therefore more practical than other approaches. Test results on a real 110 KV transmission line illustrate the effectiveness of the proposed approach.