Transmission line parameters vary with environmental and operating conditions, thus the paper proposes a digital twin-based transmission line model. Based on synchrophasor measurements from phasor measurement units, the proposed model can use the maximum likelihood estimation (MLE) to reduce the uncertainty between the digital twin and its physical counterpart. A case study of transmission line has been conducted in the paper, the influence of the uncertainty in the measurements on the digital twin for transmission line and the effectiveness of the MLE method are analyzed. The results show that the proposed digital twin-based model is very effective in reducing the influence of the uncertainty in the measurements and improving the fault location accuracy.

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