Fault location algorithm based on fault region determination for partial coupling four-circuit transmission lines

摘要

Partial coupling multi-parallel transmission lines on the same tower are widely used in power grid, but current location methods cannot achieve accurate fault location due to the structural complexity of partial coupling multi-parallel transmission lines. In this paper, according to the decoupling method of multi-parallel transmission lines, the voltage and current interface equations of coupling demarcation point are constructed to connect with the regions of lines. Then, based on the interface equations, fault analysis is performed to find out the characteristics for fault region determination of the partial coupling four-circuit transmission lines. Further, fault region determination criterion is proposed, and fault location equations of each fault region are constructed respectively to present a fault location algorithm of partial coupling four-circuit transmission lines. Finally, the simulation model for transmission lines is constructed with ATP-EMTP. As demonstrated by the analysis results, the proposed scheme can achieve accurate fault location in partial coupling multi-parallel transmission lines.