The teacher will help answer the questions about the power lightning protection module

The lightning protection module is actually a varistor, and the resistance value will change at a certain voltage. Therefore, the varistor resistance is not constant.

Generally, when the lightning protection device manufacturer designs, it will be designed to keep the varistor at a certain leakage current under the normal mains voltage, so as to protect against lightning strikes more sensitively. At this point, a certain leakage current will flow from the live wire through the varistor to the ground. The leakage current of a single varistor is small, but if multiple are connected in parallel, the leakage current is large enough to trigger the leakage protection of the empty switch.

Therefore, your question is not whether the lightning protection module is bad or not, but how many of them should be used and how to configure them. Theoretically, as long as one lightning protection module occurs, the others cannot reach the trigger point of protection, and simultaneous protection cannot be realized.

For example, it's as if the sky is falling and the tall man is on top of it, and no amount of short people can help.

In general, the access resistance of the parallel lightning protection security device is very large, so the test only needs to see whether the resistance is relatively large, in addition, as far as you said, I think the main reason may be that there is a short circuit inside the security device, you only need to use a multimeter to test the resistance of the security device, if it is relatively small, it means that the problem is indeed in the security device.

Hope it helps.

Generally, lightning protection SPDs have indicator windows. If damaged, the window will jump red. Normally, the window is green.

Of course, many domestic manufacturers are looking for Wenzhou OEM manufacturing, and the quality is not very good. Some of them are red, and the internal blurting device still has no action.

Few domestic SPD products have passed the TOV test. At present, German Shield and a lightning protection company in Xiamen have passed the TOV test and TUV certification.

Look at the perspective window to see if there is a red jump, the green is normal and the red is invalid.

The lightning protection module that people leak in the mouth sometimes refers to the surge protection car detector, sometimes refers to the graphite grounding module, I don't know what the lightning protection module mentioned in your question means.

If it refers to the drawing of the surge protector, its closing finger ground end should be connected with the grounding end of the distribution frame, and the grounding wire of the distribution frame should be connected to the equipotential grounding terminal board with a multi-strand copper wire with a cross-sectional area of not less than 16mm2.

If it refers to the graphite grounding module, it needs to be dug and laid, and welded in place, pay attention to the welding process, do a good job of anti-corrosion treatment, and finally restore the road surface. This is covert engineering.

The lightning protection module is a passive device that does not require electricity, so it does not need additional access voltage.

For the power lightning protection module, it is connected in parallel to the circuit, and for the signal lightning protection, it is generally connected in series to the circuit. Its lightning protection components (graphite or varistor) can be regarded as insulators when there is no strong voltage and strong current. Only when the lightning strikes a strong voltage (generally about 600V in the case of mains 220V) exceeds the starting voltage of the lightning protector, the components in the lightning protector will turn on and the resistance will approach 0, so that the lightning current will be introduced to the ground through the grounding system.

The lightning module is used to discharge the lightning current, and is usually used for the safety protection of the electrical equipment of the power system.

As we all know, thunder and lightning in thunderstorms are very dangerous, and lightning will have a great impact on our production and life, so how can we turn this "danger" into a disaster? In the communication power supply, we need to use a kind of protection device, which is called "lightning protection module". When encountering a lightning strike, the lightning protection module will introduce the instantaneous high current into the ground and release it to ensure the safety of electrical equipment.

In the parameter table or installation instructions of the regular lightning protection module, the maximum backup fuse value is indicated. Don't use circuit breakers, use fuses!

Power surge and surge are the same concept. Surge protective devices (SPDs), i.e. lightning protection devices, are also known as surge protective devices.

The lightning protection module is a kind of lightning protection device, which is made into a module shape and stuck on the matching base. The base is usually mounted on a rail.

The lightning protection module is to connect the line celery belt with the "ground" instantaneously after sensing the high voltage on the line to discharge the lightning current.

If the lightning protection module is to operate normally, the following conditions need to be met:

1. The wiring method is stupid and early: Kevin connection, wire correspondence;

2. The performance of the lightning channel is good - the resistance is small: the wire diameter is sufficient, and the grounding wire is smaller;

3. The grounding resistance meets the requirements, generally less than 4 ohms;

4. In terms of power lightning protection module, it is necessary to pay attention to electrical coordination, that is, the distance between each level of lightning protection device should be appropriate.

5. The lightning protector itself is running normally: there is no phenomenon of blackening, the indicator light is normal, and it is checked normally with the module detection equipment.