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Cable performance classification and factors affecting cable performance


In daily life, there will be people who ask about the performance of the cable and do not know what is affected. Today we analyze the influence of various factors on the cable, so as to remind users to pay attention during construction or installation. possible to guarantee the high performance of the cable. Next, Zhengzhou Jinshui will tell you about the factors that affect the performance of insulated cables through this blog post?

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Cable performance classification and factors affecting cable performance

 

A cable is composed of one or more mutually insulated conductors and an outer insulating layer, and its main function is to transmit power or information from one place to another. A rope-like cable usually twisted by several or groups of conductors (at least two in each group), each group of conductors is insulated from each other, and is often twisted around a center, and the entire outer surface is covered with a high degree of insulation overlay.

Classification of cables

 

Cables are divided into insulated power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mine cables, aluminum alloy cables, etc. They are all composed of single or multi-strand wires and insulation layers, and are used to connect circuits, electrical appliances, etc.

Main Factors Affecting the Performance of Insulated Power Cables

 

Insulated power cables are used in various projects to provide people with sufficient power resources. With people's dependence on electricity, more stable and reliable power cable equipment is needed to ensure people's daily life. In addition, in the power cable During the construction process, it is also an important factor affecting the application of cables. People need to pay attention to several issues during the construction of power cables.

1. Conductor - the conductor of the insulated power cable is its main component, and the conductor is the basic element to realize the function of transferring charge.
2. Ultraviolet (UV) - Do not use cables without UV protection in direct sunlight.
3. Temperature - the temperature of the cable in the metal pipe or trunking is very high, and many polymer materials will reduce the service life at this temperature. Therefore, the allowable temperature range of the selected cable should be suitable for these environments.
4. Water - Moisture in twisted-pair LAN cables increases the capacitance of the cable, which reduces impedance and causes near-end crosstalk problems.
5. Frequency - The capacitive reactance and wire material of the insulated power cable determine the frequency range of the transmitted signal. Within a suitable transmission distance, if the image is blurred, most of the cables do not meet the requirements of high-frequency transmission, resulting in the high-frequency band of the signal. loss.
6. Grounding - Proper grounding is the key to effective shielding. No or incorrect grounding may reduce the effectiveness of the shielding. An ideal shield ground should have only one point of contact. When the interference signal is coupled to the shielding layer, the current will be directed to the ground, preventing the wire pairs under the shielding layer from being affected.
7. Length - The attenuation of the signal is proportional to the length of the cable. The longer the cable, the greater the attenuation. This is the physical law of the cable. The length of the cable is generally marked in feet or meters. The audio and video signal passing through a long-distance cable will cause signal attenuation. The difference has also become the basis for comparing the cable quality (the different attenuation of the cable per unit length for the transmission of the same signal).
8. Balance - highly balanced, stable UTP can provide great immunity. Each twisted half of the pair can be thought of as a loop antenna. The other half of the consecutive twists are all opposite in direction to the upper wire. In a perfectly balanced cable, the alternating polarity of the loop antenna will cancel the interference added to the wire pair.