When we buy the lightning protection device from the lightning protection manufacturer, how can we distinguish the quality of the lightning protection device?
1. It can be seen from the response time: determine whether the lightning arrester can respond in time and quickly discharge the lightning current.
2. It can be seen from the insertion loss: this refers to the installation of a lightning protector, the impact of this lightning protector on the line, the smaller the better
3. It can be seen from the number of impact resistance: determines the service life of the lightning arrester. Generally, the gas discharge tube will not drop after being placed for a period of time. If you want to check its quality, you can use an adjustable high-voltage DC power supply. test.
Generally, the quality of the lightning protection device is judged from these three indicators. If the lightning protection device is very close to the electrical equipment, then (assuming the electrical distance L=0), then the residual voltage of the lightning strike electrical equipment is equal to the lightning protection The residual pressure of the device, the lower the residual pressure, the safer the protected equipment
I believe that many customers have a question about the lightning protection device, that is, whether the lightning protection device can only protect against one lightning strike and it will be broken. Here I will tell you how many lightning strikes the lightning protection device can protect is related to the amount of lightning strike energy.
For example, gandian lightning protection model G2040MT, the maximum discharge current Imax is 40kA, and the nominal discharge current In is 20kA. According to the standard, this product must be able to withstand the maximum discharge current 40KA at least once and the nominal discharge current 20KA for fifteen times.
This is only a standard requirement. The actual power surge protector can withstand more times. When the surge is less than 20kA and only a few KA, this product can protect it for dozens of times without any problems. When the surge is greater than the maximum current capacity of the product label, the product may be damaged. For example, a 60KA surge hitting a 40KA surge protector will damage the surge protector.
Surge protectors are also called overvoltage protectors, surge protectors, surge absorption surge protectors, power supply surge protectors, DC power surge protectors, etc. The lightning protectors used for power cord protection are called power supply protectors. Mine weapon. In view of the current characteristics of lightning damage, lightning protection is especially in the rectification of lightning protection, and the protection scheme based on lightning protection is the simplest and most economical lightning protection solution. The main function of the lightning arrester is to keep the potential at both ends of it consistent or within a range during transient phenomena, and to transfer excess energy on the active conductor.
Some main technical parameters of the lightning protection device: rated working voltage, rated working current, the nominal current capacity of the power supply lightning protection device. The maximum current capacity, that is, the ability of the lightning protector to transfer lightning current and withstand overcurrent, is in kiloamperes, and is related to the waveform form. The lightning protection device can be divided into the lightning protection device that can prevent direct lightning and the lightning protection device that can prevent direct lightning. The lightning protection device that can prevent direct lightning is usually used for line protection that may be struck by direct lightning, such as LZOA area and Protection at the junction of LPZ1 zone.