Design Points And Wiring Forms Of SPD Surge Protective Device In Power Distribution System

In this article, the SPD surge protective device manufacturer tells you the design points of the SPD surge protector, the problems encountered in actual construction and the wiring form of SPD in the power distribution system.

Design of SPD Surge Protective Device

1、 Design of Surge Protector
(1) Shortcomings in SPD design
At present, there are still many shortcomings in the design of SPD, which have caused many problems in actual construction and even caused project delays, as follows:
1) The description of the design is too simple, the meaning is not clear, and the installation requirements are not specific enough. SPD surge protective device manufacturer warm prompt,During construction, it can easily cause a lot of uncertainty, which may cause damage or economic losses to the electronic equipment to be protected.
2) The design of surge protectors is not flexible enough, sometimes even directly applying fixed lightning protection construction drawings without targeted design based on the grounding system of the distribution system, which may lead to errors in the specific wiring and installation of SPDs.
3) In the distribution system diagram, the design parameters of SPD are not complete enough, such as important parameters such as voltage protection level UP, explosion-proof, maximum operating voltage UC, etc., which are not designed or partially designed, or some parameters are inaccurate, resulting in faults or damage to electronic equipment in the actual operation of surge protectors.
4) The design specification is not detailed. SPD surge protective device manufacturer tells you,Generally, there should be a detailed design specification for SPD design, such as a project overview, design basis, whether electronic information systems are included, and the protection level of SPD design.

(2) Key points of SPD design
1) SPD design description: project overview, building lightning protection classification, design basis, lightning protection level of electronic information system, grounding system, cable entry method, requirements for grounding resistance, etc.
2) List the installation location of SPD, number of electrical box, level of protection, quantity, basic parameters (nominal discharge current In or impulse current Iimp, maximum operating voltage UC, voltage protection level UP), etc.
(3) Wiring Forms of SPD in Distribution Systems
SPD surge protective device manufacturer tells you,there are four types of grounding systems for low-voltage distribution systems: IT, TT, TN-S, and TN-C-S. Therefore, SPD needs to choose different wiring details based on the different grounding systems of the low-voltage distribution system. For example, when using the TN AC distribution system for power supply, the distribution line from the main distribution box in the building needs to use the TN-S grounding system.