In order to lower contact voltage and cross voltage around switch device, to insure operation safety, we also take some measures, such as using voltage balance net with sizes 3m × 3m, block stone, asphalt concrete grouting layer on ground, etc. 采取3m×3m均压网、块石、沥青混凝土地面填层等,以降低配电装置范围内的接触电压与跨步电压,保证运行安全。