A Novel SVM-Based Transient Protection Algorithm for Transmission Lines

Based on the support vector machine (SVM), this paper presents an innovative transient protection algorithm for ultra-high voltage lines. Busbar’s distributed capacitance to the ground has significant effects on bypass shunting. High-frequency transient currents are significantly attenuated when they pass through the busbar. Accordingly, the difference of instantaneous-mplitude- integral of the initial inherent mode function (DIAI-IMF1) of the transient fault currents from two lines connected to the same busbar generally varies significantly when a fault happens within the protected area or outside of it. In addition, the DIAI-IMF1 varies depending on the initial fault angle or transient resistance. In the proposed algorithm, the vector containing the DIAI-IMF1, initial fault angle, and transient resistance is utilized as the SVMs’ input dataset. It means that different relay-action values are used to determine the fault under varying fault conditions using trained-SVMs, thereby significantly enhancing the protection’s reliability and sensitivity. Importantly, only typical data that is usually produced during critical fault scenarios were required for SVMs training, enabling the implementation of the presented algorithm in the actual project. The procedure is evaluated using ATP/EMTP, and the statistical outcomes are provided.