In lightning protection, the surge protection device in distribution boxes plays a crucial role. According to the principle of graded lightning protection, and based on the likelihood of a building being struck by lightning, it is necessary to deploy surge protector against lightning in stages to ensure the safety of the power system and electrical equipment.
Scope of Application
The main distribution box at the power supply system's entry point.
Purpose
Absorb high-energy surge currents and protect downstream circuits and equipment.
Installation Recommendations
Connect the three-phase wires A/B/C to the corresponding terminals of the surge protector.
The yellow-green ground wire should be connected to the distribution box's dedicated surge protection grounding terminal (note: not the power ground or protective earth).
Technical Requirements
Level 1 SPD box surge discharge current ≥ 12.5kA.
Maximum discharge capacity: ≥ 100kA per phase.
Voltage protection level: ≤ 2500V.
The Level 1 surge protection device is designed to withstand high-current surges from direct lightning strikes or induced lightning. It diverts most surge current to the earth. This device mainly protects the basic safety of the power system and provides a medium level of voltage limitation, but cannot fully protect sensitive equipment within the system.
Scope of Application
Distribution boxes supplying power to important or sensitive equipment.
Purpose
Further absorb the residual surge energy after Level 1 protection and enhance the ability to suppress transient overvoltages.
Installation Recommendations
Install the Level 2 surge protection device in the distribution equipment to focus on protecting sensitive equipment.
Technical Requirements
Maximum discharge capacity: ≥ 40kA per phase.
Voltage protection level: ≤ 2000V.
Level 2 protection mainly focuses on suppressing transient overvoltages and effectively absorbs the residual surge energy after Level 1 protection. This level of protection is usually sufficient for the normal operation of most electrical devices.
Scope of Application
Within the electrical equipment or at the terminal power supply.
Purpose
Completely eliminate the effects of micro transient overvoltages and protect precision electronic equipment.
Installation Recommendations
Install the Level 3 surge protection device inside the equipment or at the equipment's power supply input, especially for critical or sensitive electronic devices.
Technical Requirements
Maximum discharge capacity: 20kA per phase or lower.
Voltage protection level: ≤ 1800V.
Level 3 protection is the final barrier of the system, capable of fully eliminating any transient overvoltage that may occur, ensuring the long-term stable operation of sensitive equipment.
A Lightning Surge Protection Plan Required for Petrochemical ProjectsNovember 28, 2023Implementing a lightning surge protection plan is crucial for petrochemical projects to safeguard critical infrastructure, equipment, and personnel. Lightning poses a significant risk to facilities, e...viewWhat Are the Classification Protection of Lightning Protection System?January 10, 20221. Type 1 lightning protectionThe aim is to prevent voltage surge from being directly conducted from LPZ0 to LPZ1 and limit the voltage surge varying from tens of thousands of volts to hundreds of tho...viewSurge Protector Grading Protection-Do You Know It?March 13, 2023The surge current energy generated by lightning strikes is enormous, so a step-by-step release approach should be adopted to release the surge current into the ground in stages.1. Graded Protection of...viewWhat Are the Effects of Surge Protectors?April 26, 2022SPD surge protection device is an electrical equipment used to limit transient overvoltage and discharge surge current. It is also called lightning arrester, which is an important part of the internal...viewPrice and Brand of Lightning ArresterJanuary 10, 2022A surge protector, also called as surge diverter, surge suppressor, or surge protection device (SPD), is an appliance designed to protect electrical devices from induced lightning.1. How about the sur...viewThe Importance of Lightning Protectors in Protecting Home Appliances and ElectronicsFebruary 29, 2024In today's digital age, our homes are filled with a multitude of electronics and appliances that we rely on daily. From televisions and computers to refrigerators and washing machines, these devic...view
EN
jp 
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
ro 
bg 
nl 
