| 摘要 |
<p>PURPOSE:To reduce lightning surge in good balance among phases by connecting the bushings of phases having long bus bars at the lead-in section of a substation comprising a gas insulated switchgears to the lower power lines of a closest steel tower and connecting the bushings of phases having short bus bars to the upper power lines of the closest steel tower. CONSTITUTION:The lead-in section 1 for a substation comprises air/gas bushings 3-8, gas bus bars 9-14, line breakers 15-20, and lightning arresters 21-26, which are connected to main bus bars 40 and 41. The power line upper, intermediate, and lower phases 100, 101, and 102 of the first line 50 on a steel tower 2 are connected to bushings 23, 22, and 21 respectively and the power line upper, intermediate, and lower phases 103, 104, 105 of the second line 51 are connected to bushings 24, 25, and 26 respectively. That is, the bushings of the phases with the longest gas bus bars are connected to the lower-phases power lines and the bushings of the phases with the second longest gas bus bars are connected to the intermediate-phase power lines.</p> |
