Height and protection radius(m)
Note: The above data is the test result when the height of the lightning rod H = 5 meters.
Calculation method of the protection radius of the active pre-discharge lightning rod
Suppose that the forestall start time of the lightning rod is T, then the forestall distance of upward leader△ L=V=V* △T according to the
calculation method provided by NFC-17-102standard, the protection radius Rp is calculated according to the following formula:
Representative= h(2D-h)+ △ L(2d+ △ L)h≥5
D motor distance, it depends on the level of protected buildings, for level Ill protection object,D values are20m, 45m,60m separately.
h is the distance from the top of the lightning rod to the protected plane.
o T is tested by the evaluation and calculated (see table above) V=106m/s, △ L=V* △T
Main technical parameters
