土壤电阻率ρ (Ω·m) | ≤100 | 100~500 | 500~1000 | 1000~2000 | ≥2000 |
接地电阻规程值(Ω) | 10 | 15 | 20 | 25 | 30 |
110 kV耐雷水平(kA) | 70 | 46 | 35 | 28 | 23.3 |
(与设计值70 kA比值) | 100% | 65.70% | 50% | 40% | 33.30% |
220 kV耐雷水平(kA) | 120 | 80 | 60 | 48 | 40 |
(与设计值90 kA比值) | 133% | 88.90% | 66.70% | 53.30% | 44.40% |
500 kV耐雷水平(kA) | 220 | 146.7 | 110 | 88 | 73.3 |
(与设计值150 kA比值) | 146.70% | 97.80% | 73.30% | 58.70% | 48.90% |