| 摘要 |
<p>PURPOSE:To enable the prevention of erroneous output and display, by arranging a discharger in parallel with a capacitor for voltage division to eliminate the overlapping of an applied load AC voltage and a DC voltage in an AC voltage sensor. CONSTITUTION:A load AC voltage at an AC voltage loaded part 2 is divided by a floating electrostatic capacitance 4 of a capacitance C1 and a capacitance C2 of a capacitor 5 for voltage division to be applied to an AC voltage sensor 6. Light sent to the AC voltage sensor 6 from a processing circuit 8 through an optical fiber 7 is modulated in the intensity of light according to the load AC voltage applied to the AC voltage sensor 6. Thereafter, the light is sent to the processing circuit 8 through the optical fiber 7 to display the load AC voltage. On the other hand, a discharger 9 arranged in parallel with the capacitor for voltage division quickly discharges electric charges released to and accumulated in an intermediate electrode 3 by release of an electric field, corona discharge and the like to reduce a DC voltage remaining in the capacitor 5 almost to zero.</p> |
