Lightning Protection Grounding - Growatt MAC 30KTL3-X LV Installation & Operation Manual

6.5 Lightning Protection Grounding

Lightning
protection device
Photovoltaic panel
Safety
interval S
Lightning down the line
1. It is generally recommended to install lightning protection devices (generally referred to as lightning rods or lightning
protection belts and down conductors at the top of the building) to prevent lightning from hitting the PV array. (Note1)
2. Lightning protection devices and down-conductors and related equipment in photovoltaic systems (including
photovoltaic panels, inverters, cables, power distribution equipment) shall maintain a safe separation distance S; Suggested
value of S: According to the general 5 storey height (about 15m) building roof, S takes 2.5m enough, this distance can be
simplified according to the inverse relationship of the floor height. (Note2)
A. When the safety distance S is satisfied:
The position ①③ of the figure should be equipped with a lightning protection module. In general, it is recommended to
install Type II in position ① and Type I in position③
The lightning protection module should be installed at the position of the picture. Normally, the Type II should be installed
at the recommended position, and the Type 3 should be installed with the TypeI.；
B. When the safety and safety distance S is not met:
In addition to position ③, TypeI lightning protection module should be installed in Figure①②④ 124; (Note3)
3. The lightning down conductor and the equipment ground wire eventually sink at a total ground point, but the two cannot
share the wire. That is, the equipment grounding wire should be pulled separately, and the wire diameter requirement
is >6mm2 when the safety interval distance S is satisfied; (Note4)
4. Refer to GB/T 21714.3-2015 for the relevant design of the above lightning protection lightning receptor system.
Note1：Refer to IEC 61643-32 <Low Voltage Surge Protector (SPD) Part 32: Surge Protectors
Connected to the DC Side of Photovoltaic Devices—Selection and Use Guide>, Appendix C.
Note2：Refer to GB/T 21714.3-2015 <Lightning Protection Part 3 _ Physical Damage and Life Danger
of Buildings>, 6.3.1.
Note3：Refer to 6.2.2 and 6.2.3 of IEC 61643-32.
Note4：Refer to Chapter 7 and Appendix C of IEC 61643-32.
The lightning protection measures for photovoltaic systems shall be carried out in accordance with the
corresponding national standards and IEC standards. Otherwise, photovoltaic devices such as components,
inverters and power distribution facilities may be damaged by lightning. In this case, the company does
Inverter
1
4
Total grounding point
2
Grounding bar
Equipment ground wire
23 / 57
编号：GR-UM-C -00
Distribution
Cabinet
3
Power grid
SPD