Table 1 Comparison of impulse impedance for single vertical rod with and without consideration of mutual coupling
Current peak (kA) | Soil resistivity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
\(\rho =\) 50 Ω m | \(\rho =\) 100 Ω m | \(\rho =\) 500 Ω.m | |||||||
Impulse impedance (Ω) | Relative difference (in %) | Impulse impedance (Ω) | Relative Difference (in %) | Impulse impedance (Ω) | Relative difference (in %) | ||||
With mutual coupling | Without mutual coupling | With mutual coupling | Without mutual coupling | With mutual coupling | Without mutual coupling | ||||
10 | 10.51 | 10.00 | 4.85 | 21.00 | 20.20 | 3.81 | 67.00 | 65.00 | 2.98 |
20 | 8.50 | 8.00 | 5.88 | 16.60 | 15.80 | 4.82 | 47.00 | 45.00 | 4.25 |
50 | 6.40 | 6.00 | 6.25 | 12.70 | 12.00 | 5.51 | 34.80 | 33.00 | 5.17 |
100 | 5.42 | 5.00 | 7.75 | 11.00 | 10.20 | 7.27 | 30.00 | 28.40 | 5.33 |