What is the role of the surge protection device(SPD) in the distribution box:
A surge protector is installed behind the input circuit breaker inside the distribution box, and its main function is lightning protection. Its full name is: lightning surge protector.
This overvoltage protection device is to prevent lightning disasters, and it is also necessary to take into account the resonant overvoltage in the low-voltage distribution line. It is an indispensable protection device in the low-voltage power supply system.
Thunderstorm weather protects the distribution box from lightning attacks, and the voltage is high, and the large current quickly pours into the earth from the lightning protection grounding wire. The surge protection device is the guardian of our daily safety mission.
Surge protectors are suitable for various places:
Usually installed in distribution boxes, computer centers, telecommunications rooms, elevator control rooms, cable TV rooms, building automatic control rooms, fire centers, industrial automatic control rooms, frequency conversion equipment control rooms, hospital operating rooms, intensive care units and distribution boxes equipped with electronic medical equipment, etc. In addition, it can also be installed in the main lighting distribution box of residential buildings below six floors.
How to equip the power surge protector in the distribution box:
SPD can be divided into Class A, Class B, Class C, and Class D lightning protection, which are determined according to the voltage and capacity of the distribution box. 380V distribution uses Class B lightning protection, 40KA~60KA. 220V distribution box uses Class C lightning protection, 20KA~40KA.
Why must the distribution box be equipped with a surge protector?
At the moment of lightning release, the voltage is high, the current is large, and the energy release time is short. It is not enough to rely solely on external lightning protection (lightning rods, etc.). Lightning waves will directly or indirectly invade power lines, signal lines, antenna feed lines, and metal pipes. The resulting lightning and overvoltage will cause great harm to electronic, electrical equipment, and information network systems.
The damage caused by lightning is one of the most serious natural disasters. The residual voltage and induction lightning generated by lightning will still affect the electrical equipment used in the home, causing short circuits in the electrical equipment used in the home, resulting in direct losses such as combustion and explosion.
Post time: Jul-06-2024
