| 摘要 |
<p>PURPOSE:To miniaturize a high-tension transmission current measuring instrument by confronting the light projective surface of a projecting optical fiber to the light incident surface of a photo-detecting optical fiber through a screen piece driven by a mechanical displacement output equivalent to a transmission current. CONSTITUTION:Once a transmission current flowing through transmission line 1 increases or decreases, an induced voltage across secondary winding N of transformer 3 increases or decreases and the rotation displacement value of traveling coil 5b of rotary displacement mechanism 5, namely, that of screen piece 6 increases or decreases as a result. In accordance with the rotation displacement variable of screen piece 6, the number of optical fibers of photo-detecting optical fibers 8 opposing to light projective flank 7a of projective optical fibers 7 increases or decreases and, in consequence, the number of optical fibers emitting light at display part 11 increases or decreases. Therefore, a transmission current value can be found judging from the number of optcial fibers emitting light at display part 11. In this way, a high-tension transmission current measuring instrument can be miniaturized and its cost can also be reduced.</p> |
