An Adaptive Reclosing Scheme for All-Parallel Autotransformer Traction Network of High-Speed Railway Based on Multisource Information

In high-speed railway (HSR), directly reclosing a circuit breaker after a fault trip can result in a large second overcurrent, causing insulation degradation, equipment damage, and even system instability. Meanwhile, existing direct reclosing schemes fail to simultaneously identify the faulty line, fault property, and fault type, especially for all-parallel autotransformer traction networks (AATNs). Therefore, an adaptive reclosing scheme for AATNs based on multisource information is proposed in this article, including two critical methods of faulty line identification, and fault property and type identification. Specifically, a multisource fault impedance angle integrated faulty line identification method is proposed to effectively distinguish the faulty line and the healthy line. Moreover, a novel approach is developed to incorporate multisource line-to-line-induced voltages obtained by reclosing the healthy line, which facilitates the fault property and the type identification. The effectiveness and superiority of the proposed reclosing scheme are demonstrated using field tests and simulation experiments. In addition, the proposed scheme not only shortens the power outage time of the healthy line, but also completely avoids second damages to equipment, and prevents power outages when the feeder is permanently faulted to the ground, presenting its remarkable robustness benefiting from multisource information.