Lightning Protection Improvement and Economic Evaluation of Thailand’s 24 kV Distribution Line Based on Difference in Grounding Distance of Overhead Ground Wire
Table 5
Reduction cost (savings cost).
Grounding distance
(kA) (a)
P (Ip) (b)
NL (flashes/100 km/year) (c)
BFR (flashes/100 km/year) (d) = (b) × (c)
No G
3.30
0.9996
15.257
15.250
40 m
29.27
0.7242
11.048
80 m
12.84
0.9429
14.386
120 m
9.17
0.9747
14.870
160 m
7.90
0.9820
14.982
200 m
7.38
0.9843
15.017
Grounding distance
Outage cost (USD/even) (e)
Damage (USD) PV of 25 years (f) = (d) × (e)
Reduction (USD) PV of 25 years ()
Reduction (%)
No G
28,921.70
4,005,228.37
0
0.00
40 m
2,900,463.301
1,104,765.07
27.58
80 m
3,776,671.06
228,557.31
5.71
120 m
3,903,712.55
101,515.82
2.53
160 m
3,933,034.95
72,193.43
1.80
200 m
3,942,202.24
63,026.13
1.57
Outage cost per event in distribution line service area in Thailand is 28,921.70 USD/event in the year 2020 [1], where PV is the present value.
