Wire and cable are indispensable in the power system, especially on the transmission line. There are several categories, including special cables and insulated cables.
The following is a comprehensive introduction:
Wire and cable are used to transmit electrical (magnetic) energy, information, and wire products that convert electromagnetic energy. Broadly defined wire and cable are also referred to as cables. A narrower cable is an insulated cable.
Defined as: an assembly of the following components; one or more insulated cores, and their respective possible coverings, total protective layers and outer coverings, and cables with additional uninsulated conductors.
1, check the shielding layer network: whether the series is enough copper wire mesh, check the weldability, tinned copper computer wire scraping to see if it is copper wire, aluminum-magnesium alloy wire hardness is significantly greater than the copper wire; braided network is sparse, Non-uniform distribution, and the insulation layer is not tight, etc. is a poor cable; if it is copper clad aluminum, it is easy to see the internal color is not the same as the outer copper; peel the skin to see the braiding angle of the shielding layer, if basically All stand up, then basically we can see that the weaving angle is larger and it is for cutting corners and products;
2. PVC jacket: The surface can see that there is a regular “unevenness†in the inside of the crimping net, indicating that the processing technology is good and no relative slippage will occur. It is a good cable. The appearance is smooth, can't see the "unevenness" of the compacted net, and the looseness of the sheath is caused by hand, which is a poor cable;
3. Check the binding force between the core wire and the insulating layer: Cut the insulation layer obliquely, and pull the core wire in the peeling direction to see if the core wire and the insulation layer are covered with the process material; the good cable has a large binding force and is poor. The cable is not covered;
4, check the core: diameter - SYV cable is 0.78-0.8mm, SYWV cable is 1.0mm; recently appeared a SYV75-5 core diameter is 1.0mm cable, the characteristic impedance of this cable, certainly not 75 Ohm, not applied to the 75 ohm transmission system; use a vernier caliper to check the diameter of the cable core;
5. Longitudinal tensile test: Take one meter of security cable, peel the core wire, insulation layer, shield layer, and outer cover, and leave 10 centimeters for each. The method is: Two hands hold the adjacent two layers of the cable and pull in the opposite direction; the cable is generally unable to pull the power, so the cable can be easily pulled out without any effort.
6 , open a reel to measure the length, or use a weighing method to roughly judge;
solution
If you purchased the above unqualified cable and there is a problem, here are some solutions that can be recommended:
1, if the transmission distance exceeds 800 meters, with SYV-75-5 cable, the results found no images or images in the beat, which uses video segmentation amplification, you can amplify the video signal 10 times, so you can effectively extend the transmission distance
2. If several cables interfere with each other, multiple signal multiplexing devices can be used to transmit eight video images and control signals simultaneously in one video cable.
3, if you encounter the problem of cable welding, it is recommended to buy pure tin wire, and use high-power soldering iron for rapid welding, must not be slowly on the tin;
4. Finally, if you are not confident about video cables, you can also use RF cables to transmit multiple video signals. A single RF cable can transmit 20 channels of image and control signals simultaneously. Transmission range up to 3 kilometers, so that the cost will be more cost-effective.
The above is how Kexian cable to share the quality of wire and cable how to distinguish? The method of checking the cable is good and it hopes to help everyone.
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