| 摘要 |
<p>PURPOSE:To enable a voltage sensor to be arranged at distance from an electrostatic charging part, to eliminate the adverse influence of disturbance, and to facilitate initial setting operation by covering a detection electrode with a shield container except a displacement current flowing-in part and adjusting the solid angle of displacement current input. CONSTITUTION:The detection electrode 7 which collects displacement currents from power distribution lines Lu, Lv, and Lw through a space is covered with a shield container 1 held at a reference point, except a window 5 provided to a displacement current flowing-in part to the detection electrode 7. A signal processing circuit is connected to the detection electrode 7 and a signal based upon the displacement currents is obtained. The detection electrode 7 is arranged in parallel to a lid 3 and supported by the solid-angle adjusting mechanism C composed of insulating support rod 6, its screw 6a, and a thumbscrew 11 movably in an approaching or leading direction to or from the window 5 of the lid 3, so that the solid angle theta of displacement current input is adjusted. Consequently, the noncontact type sensor which is not affected by disturbance is obtained and the adjustment of the output waveform of a detection signal is facilitated by the adjustment of the solid angle.</p> |
