This tool calculates the protected area between two lightning rods based on the IEC 62305 standard and the Rolling Sphere Method, suitable for building, tower, and industrial facility lightning protection design.
Current Type
Select the type of current in the system:
- Direct Current (DC): Common in solar PV systems or DC-powered equipment
- Alternating Single-Phase (AC Single-Phase): Typical in residential power distribution
Note: This parameter is used to distinguish input modes but does not affect the protection zone calculation directly.
Inputs
Choose input method:
- Voltage/Power: Enter voltage and load power
- Power/Resistance: Enter power and line resistance
Tip: This feature may be used for future extensions (e.g., ground resistance or induced voltage calculation), but it does not influence the geometric protection range.
Height of Lightning Rod A
The height of the primary lightning rod, in meters (m) or centimeters (cm).
Usually the taller rod, defining the upper boundary of the protection zone.
Height of Lightning Rod B
The height of the second lightning rod, same unit as above.
If the rods are of different heights, an unequal-height configuration is formed.
Space Between Two Lightning Rods
Horizontal distance between the two rods, in meters (m), denoted as (d).
General rule: \( d \leq 1.5 \times (h_1 + h_2) \), otherwise effective protection cannot be achieved.
Height of the Protected Object
The height of the structure or equipment to be protected, in meters (m).
This value must not exceed the maximum allowable height within the protection zone.
Prefer equal-height rods for simpler design
Keep spacing less than 1.5 times the sum of rod heights
Ensure the protected object's height is below the protection zone
For critical facilities, consider adding a third rod or using a meshed air-termination system
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