| 摘要 |
PROBLEM TO BE SOLVED: To make selectable the optimum terminal having a largest trouble phase current as a base point terminal, and to locate accurately a fault point of both circuits by an impedance method, regardless of the power flow direction and magnitude of a current between each terminal of a transmission line, when dual-circuit in-phase one-line ground is generated in the multi-port parallel dual-circuit transmission line. SOLUTION: In base point terminal selection of this multiple-port fault point orientation device, when in-phase one-line ground of circuits L1, L2 is generated, either of terminals α, β is selected as the base point terminal based on measurement information of the currents and the voltages of each terminal α, β of the multi-port parallel dual- circuit transmission line 1, and the distance from the base point terminal to the fault point where a trouble of the circuits L1, L2 is generated is operated by the measurement information of the current and the voltage of the base point terminal and an impedance characteristic of the transmission line 1. In this method, respective absolute values of each phase current in each circuit L1, L2 are determined relative to each terminal α, β, and the sums of the absolute values of all the phase currents in the circuits L1, L2 are operated, and the terminal corresponding to the maximum sum selected therefrom is selected as the base point terminal. |
