Lightning Protection Improvement and Economic Evaluation of Thailand’s 24 kV Distribution Line Based on Difference in Grounding Distance of Overhead Ground Wire

Table 3

Permissible ground resistance (Ω).

Lightning current (kA)	Grounding distance of OHGW (m)
	40	80	120	160	200
30	8	4	2	2	2
40	4	2	1	1	1
50	2	1	—	—	—