How to choose lightning arrester correctly

The correct selection of lightning arresters requires consideration of multiple factors to ensure that they can effectively protect electrical equipment and adapt to specific usage environments and conditions. Here are some key steps and points:
Confirm power supply system:
Firstly, it is necessary to determine the type of distribution system, such as TT, TN, or IT system.
According to the type of distribution system, the protection mode and wiring method that should be used for selecting lightning arresters. For example, TN-C systems typically use 3P lightning arresters, while TN-S systems use 4P lightning arresters.
Understand the main parameters of lightning arresters:
The nominal voltage Un: should match the rated voltage of the protected system, which represents the voltage range that the lightning arrester can handle.
Maximum discharge current Imax: The maximum peak impulse current that a lightning arrester can withstand when subjected to lightning strikes.
When selecting, the Uc (continuous operating voltage) of the lightning arrester should meet the system voltage, the flow rate should meet the usage requirements, and the protection level should be lower than the equipment's withstand voltage.
Consider the type and structure of lightning arrester:
According to the needs, lightning arresters can be selected as gap type, discharge tube type, varistor type, suppressor diode type, or other combinations.
According to their protective properties, open circuit, short circuit (switch type), or voltage limiting lightning arresters can be selected.
According to the working status (installation form), parallel or series lightning arresters can be selected.
Considering the performance and environmental adaptability of lightning arresters:
The voltage withstand capacity of the lightning arrester should be sufficient to ensure that it can withstand the rated power frequency voltage of the system and possible overvoltage surges.
The lightning arrester must comply with the climate and meteorological conditions of the environment it is located in, and be able to adapt to natural factors such as vibration and vibration in the operating environment.
Choose a manufacturer with strength and reputation:
Choose a manufacturer with years of experience in lightning protection, whose products should have lightning protection testing reports to ensure safety performance is guaranteed.
Pay attention to after-sales service to ensure timely resolution and support in case of problems with lightning arresters.
Pay attention to installation and maintenance:
During installation, ensure that the upper and lower leads of the lightning arrester are properly connected and should not be too tight or loose.
The connection between the lightning arrester and the grounding wire should be short and straight, and the down conductor should have sufficient mechanical strength and current carrying capacity.
Regularly check the condition of the lightning arrester to ensure that it is in good working condition.
In summary, the correct selection of lightning arrester requires comprehensive consideration of multiple factors, including power supply system, lightning arrester parameters, type and structure, performance and environmental adaptability, as well as manufacturer strength and after-sales service. The correct selection and installation of lightning arresters can effectively protect electrical equipment from lightning damage and ensure the stable operation of the power system.