| 摘要 |
<p>PURPOSE:To reduce the accident of ground-fault of transmission line due to lightning by grounding an aerial ground wire by a conductor insulated electrically from a steel tower. CONSTITUTION:An aerial ground wire 1 is supported by a steel tower 3 through porcelain insulators 8. The aerial ground wire 1, insulated from the steel tower 3, is connected to the internal conductor 11 of a conductor 10, insulated from the steel tower through a coating material, through a connecting clamp 9. The other end of the insulated conductor 10 is extended and buried into the earth. According to this method, lightning current, striking the aerial ground wire 1, is not conducted through the steel tower 3 and, accordingly, the potential increase of the steel tower will never be generated. Further, when the insulated conductor 10 is connected to the lower part of the steel tower 3, the steel tower 3 is grounded with a low resistance, therefore, the grounding resistance of the insulated conductor 10 becomes small and grounding work becomes unnecessary. The lightning current is conducted through the conductor 10, insulated electrically from the steel tower 3 in such a manner therefore, the accident of ground-fault of a transmission line may be reduced.</p> |
