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

Table 2

Parameters in ATP-EMTP modeling.

Description		Data
Lightning current	Peak value	40 kA
	Time to half value	77.5 μs
	Time to crest value	0.936/0.411 = 4.12 μs
Conductor (single)	Outside diameter	16 mm
	Direct current resistance	0.2 Ω/km
OHGW	Outside diameter	7.93 mm
	Direct current resistance	4.7 Ω/km
External ground wire	Outside diameter	7.93 mm
	Impedance (Zt)	408 Ω
	Speed of lightning wave	300 m/μs
Concrete pole	Span of the pole	40 m
	Height	12 m
Single ground rod	Diameter of ground rod	16 mm
	Length of ground rod	2.4 m
	Ground resistance®	1–30 Ω
	Earth resistivity	40 Ω·m