Only by taking precautions can we ensure safety and no hidden dangers. Nowadays, the exterior of general solar street lamps is made of conductive materials, which itself is equivalent to a lightning rod. The design must be equipped with down conductors and ground grids. These systems constitute an external lightning protection system. This system can avoid fire and personal safety accidents caused by direct lightning strike of LED street lamps. The internal lightning protection system refers to the protection of the equipment by grounding and setting voltage protection inside the street lamp. This system can prevent the intrusion of induction lightning and other forms of overvoltage, resulting in power supply damage. The two are complementary and complementary to each other. Therefore, it is necessary to take a series of lightning protection measures. LIXIN has compiled the following points for you:
01 Protective grounding
In order to prevent personal and equipment safety from equipment leakage, the exposed conductive parts of all electrical equipment are grounded through the ground wire, and the grounding resistance should meet the installation action requirements of the leakage protector.
02 Working grounding
Ground the neutral point of the low-voltage grid directly, and the system grounding resistance should be less than 10Ω.
03 Lightning protection grounding
In order to prevent electrical equipment from being struck by lightning, ground the lightning protection devices such as lightning rods, lightning wires and lightning arresters, and the grounding resistance should be less than 10Ω.
04 to zero
Connect the metal casing, metal frame, etc. of electrical equipment to the neutral ground. The grounding wire should be an insulated wire, and the whole wire should be used without joints in the middle. The grounding wire of the arrester should be selected to the shortest distance to the grounding wire. The cross-sectional area of the phase line of the protection device S≤16mm2
, the minimum cross-sectional area of the grounding wire and protection wire is S; if 16≤35, the minimum cross-sectional area of the grounding wire and protection wire is 16; if S>35, the minimum cross-sectional area of the grounding wire and protection wire is S/2. The welding length of the ground wire Flat steel ≥ 2 times the width of the flat steel.
Post time: Mar-15-2023