Table 5 Comparison of impulse impedance for different length of horizontal grounding electrodes buried in soil at 0.8 m depth with and without consideration of mutual coupling

Grounding Electrode Length (m)

Current peak (kA)

10 (kA)

20 (kA)

50 (kA)

Impulse Impedance (Ω)

Impulse Impedance (Ω)

Impulse Impedance (Ω)

With mutual coupling

Without mutual coupling

Relative difference (in %)

With mutual coupling

Without mutual coupling

Relative difference (in %)

With mutual coupling

Without mutual coupling

Relative difference (in %)