| 摘要 |
PURPOSE:To provide an accident section locating device which can locate points where accidents occur in iron tower grounding, interphase short-circuting, and span grounding accurately. CONSTITUTION:Current sensors 1, 1 are installed at the side with an old number and that with a young number of an ground-wire GW with an iron tower A as the center. Also, magnetic field sensors 2, 2 for detecting the accident current flowing to a power line B of two lines by spatial magnetic coupling with the magnetic field around the power line are provided. Then, if there is a change indicating an accident in the output of the sensors 1, 1, an accident section is located according to the size and phase difference relationship of the earth line current. On the other hand, if the output of the sensors 1, 1 does not change and that of the sensors 2, 2 changes, an accident section based on the signals of the sensors 2, 2 is performed, thus detecting the span grounding with less change in the ground-wire current according to the output of a magnetic field sensor. |
