Faulted Section Identification in Mixed Lines Using One End Current Traveling Waves

Abstract

A faulted section identification method for mixed lines is proposed using initial current traveling waves (TWs) of one end. The ratio of alpha-mode to zero-mode magnitude is used to identify the faulted cable/overhead line section. The properties of attenuation and transmission of zero-mode and alpha-mode current TWs in mixed lines are utilized to obtain a threshold for faulted section identification. The method does not require reflected TWs, data from the remote end, and data synchronization. The performance of the proposed method is evaluated for faults simulated on various transmission networks. The method is advantageous for faults near the junction when the line parameters are uncertain. Comparative assessment demonstrates the superiority of the proposed method for faulted section identification of mixed lines.