Energy Coordination Of Surge Protectors In Lightning Protection Design
Energy coordination of surge protectors in lightning protection design. In actual work and production, we often have such a question: How many levels of surge protection device should we install? How large should the parameters of the surge protective device be? Not only readers, but many of my customers often have questions about this issue.
Energy coordination of surge protectors in lightning protection design Generally speaking, for a primary surge protector, its main function is called discharge; for a secondary surge protector, its main function is called voltage limiting. In any case, their ultimate function is to ensure the final residual pressure, that is, the protection voltage level Up must meet the withstand voltage requirements of the protection equipment and will not cause damage to the line.
Energy coordination of surge protectors in lightning protection design Usually, if the sum of the Up value of the surge protector and the sum of the resistance and inductance voltage drop on the line △U is not greater than 0.8 times the withstand voltage of the equipment, then we can say that the energy coordination function is achieved between the SPD and the equipment. But if it is not met, then we need to install a secondary surge protector.
In addition, sometimes because the line is too long, there will be a distance between the SPD and the equipment, so the lightning current may be excited in the line, resulting in a reflected wave effect. In the actual design, the maximum oscillation distance and the maximum coupling distance should also be considered to determine how many surge protectors to install.
Energy coordination of surge protectors in lightning protection design. In addition, we should also consider the energy coordination between the two-stage surge protectors installed to ensure that the first-stage surge protector is turned on first, and then the second-stage surge protector is turned on.
