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

Table 4

Minimum critical impulse flashover (kV) at 10 Ω ground resistance (average in Thailand).

Lightning current (kA)	Grounding distance of OHGW (m)
	40	80	120	160	200
30	222	267	292	292	300
40	268	324	358	359	360
50	310	377	416	418	420