| 摘要 |
PROBLEM TO BE SOLVED: To provide a power distribution line control system for transmitting a phase detection signal, where the voltage of a carrier signal is not superposed to a control device. SOLUTION: A biphasol phase detection signal output line for taking a phase detection signal out of a coupler that is connected to a power distribution line before and after a switcher which is attached to the power distribution line is connected to both ends of the primary coil winding of an insulation transformer, and at the same time, both ends of a secondary coil winding with a middle tap F are used as the phase detection signal output terminals of each of the above two phases, and the secondary coil winding middle tap F is connected to the ground, thus eliminating a carrier voltage component from the phase detection signal.
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