Can control cables take the place of power cables?
The cable core structure of the control cable is a central layer stranding structure, and the distribution parameter is mainly considered according to Ohm's law, so it is much simpler than the communication cable.The selection of the cable should be selected according to the cable characteristics. The power cable should be used to transmit the control cables for general switching and analog signals, and the corresponding communication cables should be adopted for high frequency and high speed communication......A communication cable conductor has both single and multiple strands, such as.The single stranded wire core has simple process and is processed by a fixed core mold without adjusting the core, so that it can be produced at a high speed, and the output per unit time is large, the cost is lowered naturally, and the cable is much cheaper. The disadvantage is that the single stranded conductor has poor flexibility and breaks easily.In addition to the regular multi strand conductor stranding process, extruded insulation, it is necessary to adopt the mold core can be offset, so relatively low efficiency, the manufacturing cost is relatively increased, but to enhance the core line flexibility, should not be broken.
May not！See the code for design of GB 50217-2007 power engineering cable.Cable is the general concept, including power cables, control cables, communication cables and so on.Communication cables are generally two-way transmission, while control cables are one-way transmission.There are three kinds of communication cables: twisted pair, star twist and coaxial. The core structure must be designed according to the transmission line equation and the two parameters.The cable core structure of the control cable is a central layer stranding structure, and the distribution parameter is mainly considered according to Ohm's law, so it is much simpler than the communication cable.
In the case of the same conductor cross section and the same insulation outer diameter, the surface area of a single strand is smaller than that of a multiple conductor, and the capacitance between such cores is much smaller, which means greater impedance of characteristics can be obtained. In order to obtain the same characteristic impedance, the line of multi conductor must have greater insulation outer diameter, which will inevitably increase the cost of the cable!Of course, the skin effect of a relatively large surface conductor in transmitting high frequency signals can not be ignored.For fixed installation environment, can choose single conductor cable; and for the frequent movement, vibration, explosive and other industrial environment, requires a plurality of soft cable conductor structure of high performance and high reliability!
