An adaptive HV transmission lines reclosing based on voltage pattern in the complex plane

Transient single-phase short circuits are the most common transmission line faults. The short circuit arc of a transient fault is usually self-extinguishing after opening the line circuit breakers. High-speed single-phase reclosing of transmission line can help to improve system stability. Employing a pre-set reclosing interval may pose problem if the time interval is not sufficient to fully deionize the fault arc. It is desirable to have adaptive reclosing interval and fast detection of arc extinction, which could facilitate successful high-speed reclosing of transmission line and bring benefit to the system stability. A new adaptive reclosing algorithm is proposed in this paper. It uses the pattern of the faulted phase voltage in the complex plane to distinguish between transient and permanent faults and is also able to detect the time when the arc is extinguished. Theoretical analysis is provided to support the technique. In addition, the performance of the proposed technique is verified using a recorded field data from 765 kV transmission line and several cases simulated in EMTP including detailed arc and CVT modeling.