| 摘要 |
PURPOSE:To cope easily with even a complicated fault and not to prolong a time required for the switching in case of a comparatively simple and frequency fault by adopting the two-stage of changeover of a transmission line. CONSTITUTION:If a fault takes place in a transmission line supervised by a station 3 to be controlled, the station 3 sends fault information to a control station 1 and other stations 2-6 to be controlled. If the fault is a simple fault, since a switching pattern is stored in storage devices 7-12, the switching of the transmission line is applied automatically immediately at a relevant station. When a complicated fault takes place, even when the station to be controlled retrieves a storage device in then own station, since no switching pattern is obtained, a signal from then control station 1 is awaited. The control station 1 retrieves the switching pattern based on fault information sent from the station 3 to be controlled, and when the pattern exists, a switching pattern signal is sent to the relevant station to be controlled. When not in existing, a new switching pattern is designated by a new switching pattern design device 7' based on the fault information and the pattern is sent to the station to be controlled.
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