1000 kV特高压变电站带电作业试验研究

Test Research of Live Working in 1 000 kV UHV Substation

为了确保特高压变电站作业人员和设备的安全,开展了特高压变电站带电作业的最小安全距离和组合间隙的试验研究。通过分析1 000 k V特高压变电站带电检修典型作业工况,针对作业人员与周围带电体、接地体之间构成的空气间隙进行操作冲击试验,获得典型带电作业间隙的放电特性曲线。结合典型作业工况下间隙的放电特性,根据变电站通用设计方案的操作过电压水平,计算得到带电作业最小电气安全距离(分裂软母线相地6.8 m、相间9.1 m,硬管母线相地6.2 m、相间9.0 m),以及构架侧方进出分裂母线的最小组合间隙6.2 m、绝缘升降平台法地面进出硬管母线的最小组合间隙6.3 m;最后校核了通用设计方案中相地和相间距离带电作业危险率。研究结果表明特高压变电站带电作业满足安全性的要求,为特高压变电站带电作业的安全开展提供了技术支撑。

The minimum approach and apparatus during Eve working distances and complex gaps test are completed to insure the safety of workers in UHV substation. Typical working condition of live maintenance in 1 000 kV UHV substation were analyzed. Then switching impulse discharging test on air gaps that around the workers, ground structures and the charged conductors were conducted and the discharging characteristic curve of typical live working gaps were acquired under typical operation working. According to the switching overvohage level of the general designation in substation, the minimum electrical safety distance of live working are calculated quad bundle bus phase-to-earth 6.8 m, phase-to-phase 9.1 m, hard tube bus phase-to-earth 6.2 m, phase-to-phase 9.0 m）, the minimum complex gap of entering and leaving the quad bundle bus 6.2 m and the minimum complex gap of entering and leaving hard tube bus by insulation lifting platform 6.3 m. Finally, the risk rate of live working is checked in this article, which provides technical support for the safety of live working in UHV substation.