Other brands of weak current lightning arresters VS Australia and the United States
Lightning protection ground wire technology
1. It is not a pioneering technology.
1. The first DDW equipotential-free lightning protection ground wire technology in China has won the "Guangdong Provincial Major Scientific and Technological Research Achievement" Award issued by the Guangdong Provincial Science and Technology Commission.
Signal lightning protection technology
1. Originally engaged in the manufacture of SPD lightning protection modules for grounding networks, and later added lightning protection products for weak electrical signals. It took time to understand the signal transmission loss.
1. The beginning was engaged in the manufacture of special products for transmission systems in the field of broadcasting and television, including television differential frequency converters, modems, and unidirectional two-way transmission amplifiers. The lightning protection ground wire technology was born because of the lightning protection design of the cable television network transmission system.
Lightning protection start accuracy
The national standard for component deviation values is allowed within ± 20%. For example, the design and manufacture of power lightning arrester protection start voltage is 1000V. When components with deviation value ± 20% are selected, the entire batch of lightning arrester protection start voltages are respectively It ranges from 800V to 1200V, and the upper and lower deviation value is as large as 400V. And the power withstand voltage of general electronic equipment also has upper and lower limit deviation values. For example, the upper limit of the withstand voltage of an electronic device is 1100V, and the starting voltage of the optional lightning arrester is exactly 1200V. Before the lightning arrester can protect the equipment, it has been damaged by lightning.
Aiming at the point that the withstand voltage value of electronic equipment is at the critical point and is easily damaged by lightning, some people say that it is sufficient to lower the start-up protection voltage when designing it. The problem is not very serious for the manufacture of 220V power lightning arresters. Large, but it is not the same for the manufacture of signal lightning arresters for transmission systems. When the lower limit of the lightning protection start-up voltage is too low, the signal quality in transmission will be impaired.
Signal transmission impact
For the manufacture of signal lightning arresters for transmission systems, when the lower limit value of the lightning protection start voltage is lower, the signal quality in transmission will be damaged, and when the upper limit value is higher, the lightning protection effect will be worsened. The signal port of the electronic device is easy Damaged by lightning.
Therefore, to design and manufacture a good signal lightning protection device, there should be three points. The first is the experience of processing various signal sources and transmission systems. The second is the experience of low-voltage lightning protection technology. The third is to choose a small deviation value. Components.
Lightning protection stability
1. Most of the lightning protection products are not manufactured in accordance with national standards. The use of low-pass traffic as the standard traffic is a non-standard product and the quality cannot be guaranteed. (If the standard throughput is 40KA, it is actually only half of 20 ~ 30KA.
1. Lightning arresters manufactured by Australia, the United States and the United States strictly manufactured in accordance with national standards GB18802.1-2011, GB / T18802.21-2004, with ample traffic and a margin. (For example, when manufacturing a parameter indicating that the throughput is 40AK, the actual throughput will be greater than 45KA)
Engineering quality value
1. The quality of the project is not high, and the low product price is the advantage of the current low cost of the project, but the overall project stability cannot be guaranteed, and the subsequent after-sales workload and costs are also large.
1. For those who have high requirements for project quality and product quality, they will find the price reasonable, because they are guaranteed the stability of the entire project, and the after-sale workload and costs are small.