| 摘要 |
<p>PURPOSE:To reduce a change in characteristics due to a change in the potential of a conductor element such as a potential divider caused by rainfall or the like by a method wherein a distance between cases holding a distribution line between and fixing it and a core of high permeability surrounding the distribution line is made to be equal or larger than a distance between the core and the distribution line. CONSTITUTION:Upper and lower cases 18 and 19 of the present apparatus hold a distribution line 2 between and fix it. An optical current sensor 11, a voltage sensor 9, a capacitor potential divider and inner and outer electrodes 16 and 17 thereof are disposed inside the case 19 and an electrode 20 is disposed in the bottom part thereof, while a horseshoe-shaped core 12 having a gap 13 is provided. Incidence and emission of light on and from the sensors 9 and 11 are conducted through an optical fiber 15. In this constitution, the shortest distances to the potential divider and the electrode 20 incorporated are made to be equal or longer than the shortest spacing between the electrodes 16 and 17 and, besides, the short distance between the core 12 and the outer surface of the case 18 is made to equal or longer than the shortest distance between the core 12 and the distribution line 2. In this way, the effect of a change in the potential of the core on the potential divider and the electrode 20 can be reduced even when contamination or damage is caused by snow or the like.</p> |
