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Analyzes post-fault arc behavior in co-tower lines, suggesting better fault management methods.
To save line corridors and increase the transmission capacity, the co‐tower erection of AC/DC transmission lines has broad prospects for development. However, due to the thyristor controlled series compensation (TCSC) on the AC side of the co‐tower lines, the fault current during a single‐phase ground fault contains high‐amplitude low‐frequency components, which are not conducive to the rapid extinction of the arc. To address this issue, based on the mechanism of the formation of the post‐fault arc in the AC side of the co‐tower lines with series compensation, a simulation model for ultra‐high and extra‐high voltage AC and DC co‐tower transmission is established. The low‐frequency components of the post‐fault arc are analyzed using power spectrum analysis. Considering the frequency characteristics of the post‐fault arc, the suppression effect of short‐circuiting the fault phase series compensation with a small resistance on the low‐frequency components is studied. The research results show that the post‐fault arc mainly consists of the fundamental frequency component, the low‐frequency component generated by the discharge of the residual voltage of the TCSC, and the induced direct current coupled from the DC side of the co‐tower. After suppression, the amplitude of the post‐fault current and the recovery voltage significantly decrease.
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Dai et al. (2026) studied this question.
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