Primary Surge Protector Selection: Importance And Considerations

The selection of a primary surge protector is crucial to the safety of the power system. Correct selection can effectively prevent surge damage. Based on the information provided, the following are the importance and precautions of selecting a primary surge protector:

Requirements for the installation location of a primary surge protector: According to the provisions of the national standard GB 50057-2010, when the electrical grounding device is shared or connected with the lightning protection grounding device, a Class I test surge protector should be installed at the main distribution box and distribution cabinet where the low-voltage power line is introduced. The correct installation location can provide the best protection effect.

Choose a suitable type of primary surge protector: The types of primary surge protectors include voltage-limiting type, switch type and composite type. When selecting, it is necessary to consider the characteristics and applicable scenarios of different types. The voltage-limiting SPD may have problems with leakage current and short life, and the switch type SPD may cause the previous switch to trip. The composite SPD combines the advantages of both, with the characteristics of no continuous current, no leakage current, long life and no tripping of the main circuit switch. Therefore, it is advisable to choose a composite SPD.

Selection of flow rate of primary surge protector: The flow rate of primary surge protector is a key consideration when selecting. Common flow rate options include 12.5KA, 15KA, 25KA, 50KA, 100KA, etc. Choose the appropriate flow rate according to specific needs and budget. The larger the flow rate, the higher the price, but it also provides higher protection capabilities. In the project, 25KA primary surge protector is often selected, which is moderately priced and can be used in buildings of any lightning protection level.

Consideration of energy automatic coordination function: When setting up multiple levels of surge protectors on a line, energy coordination is an important factor. According to GB50343-2012, when the surge protector has the energy automatic coordination function, it can eliminate the limitation of installation distance, simplify the installation process, and improve the safety of the system.

Correct selection of primary surge protector is a key step to ensure the safe operation of the power system. By selecting the appropriate type, installation location and flow rate, and considering the energy automatic coordination function, reliable protection measures can be provided. For more advice and guidance on the selection of primary surge protectors, please consult our professional team.