Kiloamp Technology - The Global Provider of Electronic Security Protection
Kiloamp 2018-08-28 425
We all know that the electronics industry is growing faster in China, and we must continue to promote its development in the industry. Next, we will analyze the specific content of the lightning protection and maintenance of the lightning protection air switch.
You first look at the air switch which conditions can protect the trip: over current, under voltage, short circuit, phase loss and so on. The models and performances of air switches used for different purposes or in different locations are different, so specific problems should be analyzed.
If an overcurrent or short-circuit current occurs due to a lightning strike causing a short circuit to the ground, if the current exceeds the operating current of the switch, it will trip.
The protection design of the general power surge protector is not a varistor problem but a more complete SPD. The protection element in the SPD has a zinc oxide varistor or a gas discharge tube, etc., and the method of installing a single varistor is not good, and the structure is inconvenient, and there is also a problem of selecting a varistor parameter. The selection of SPD also has the problem of parameter selection.
The air switch of the PDU will automatically open when there is more than 1ms, more than 6 times of the rated current of the air switch. Since the installation and operation of the open is more convenient than the fuse, it is generally used in the country instead of the fuse. When using the open, you must pay attention to:
1. Rated flow rate, the open air flow will be frequently operated, and it is difficult to find, so that the arrester does not work; if it is too large, it is difficult to protect itself;
2. The current that can be automatically cut off when the air is open and disconnected is too small, and the air itself will explode or the joint will be automatically welded.
3. It is not important to allow the line to be powered off for a period of time. When the rated current of the open type main switch is not too large, the PDU can be omitted.
In short, the lightning protection protection of the air switch of the lightning protection device has the above contents, we must grasp and understand, continue to summarize and innovate.
Next:Interpretation device signal lightning protection device attention
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