| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To offer a measuring device for a switchgear, which reduces the addition of excessive surge voltage accompanying the opening and closing of a disconnecting switch to an electronic circuit and also is so arranged as to be hardly affected by an external electromagnetic field. <P>SOLUTION: A detecting electrode 3 is counterposed to a high-voltage conductor 1 within a metallic container 2, and the detection signal by the detecting electrode 3 is taken out by a sealing terminal 4 which has sealed the opening of the metallic container 2, and a multiple container 9 is directly attached to the periphery of the metallic container 2 so as to surround the sealing terminal 4, and electronic parts such as a capacitor C2 on low voltage side, an inductance 7, an A/D converter 27, etc. are arranged within this multiple container 9, and the digital signal output of the A/D converter 27 is transmitted from a lead terminal 5. The multiple container 9 is of triple structure, and it is composed of an aluminum container 9a small in specific resistance, an iron container 9b being a magnetic substance, and a copper container 9c smaller in specific resistance. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
