| 摘要 |
The device offers protection against charges of opposite polarity to those of HT circuit. The high tension box comprises a high tension circuit board (6) within a rectangular casing (8) having an aperture (10) formed in one side. Plates (16,18) are provided both inside and outside the aperture (10) in order to counteract the effect of electrical charges which are of opposite sign to those on the HT circuit within the box, and to counteract the effect of the presence of other high potentials outside the box. The plates are electrically conducting, and are fixed in place, and are electrically connected to the casing (8). The plate which is mounted inside the casing may be covered by an electrically insulating material, whilst the plate itself is in electrical contact with the casing. |
