| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a direct-current electroscope having a function capable of detecting disconnection of an earthing wire simply and surely. SOLUTION: This direct-current electroscope is equipped with electroscope metal fittings 20 attached to the tips of insulating cylinders 111 -11n , and hooked over a stringing 1 to be blocked, to thereby be brought into electrical contact with the stringing 1, a detection part 30 installed on a part of the insulating cylinders 111 -11n and connected electrically to the fittings 20, for detecting a stringing voltage through the fittings 20 and informing of the detection information, and the earthing wire 32 for earthing the fittings 20 through the detection part 30. The detector is also equipped with a detection wire 39 having one end connected to a control power source 90 of the detection part 30 and the other end connected to a rail 38 of the earthing wire 32 to be brought into the electrically short-circuited state, and the disconnection of the earthing wire 32 can be detected by the detection wire 39.</p> |
