The application of silica in cable
The main factors determining the withstanding power of cables are as follows:
A. The highest temperature resistance of insulating media or other cable materials.
B. Heat conductivity of cables and insulating media.
C. Conductivity of conductors (or cable size).
D. Dielectric constant and dielectric loss factor of dielectric.E. Specific factors such as working environment
Simplified analysis, if the working environment, such as temperature, working altitude and working frequency are fixed, if it is necessary to increase the withstand power, it should be: 1. Increase the withstand temperature of cable insulation medium, 2. Minimize heating (reduce cable loss), 3. Dissipate heat as soon as possible (reduce the equilibrium temperature),.
Among the three methods mentioned above, the most direct one is to increase the temperature of the insulating medium, and the second is to reduce the loss. The most effective way to reduce the loss is to increase the diameter of the cable, and the second is to use the insulating medium with low dielectric constant. However, it is difficult to improve the thermal conductivity because of the material reasons, so the current general focus is on the first and second two points. At the same time, in many cases, because the size of the cable is well limited, or for easy comparison, the cable with the same diameter is generally used to compare the maximum power withstand.
In this way, there are only two ways. One is to improve the temperature resistance of the cable insulation medium, and the other is to select the insulation medium with low dielectric constant.
The following are the temperature and dielectric constant tables of common insulating materials:
Name of Insulating Material Temperature Resistance Grade (C) Dielectric Constant
Polyethylene (PE) 80-100 2.35
Foamed polyethylene (FPE) 80-100 1.26-1.65
Polypropylene (PP) 150 2.2-2.4
Polytetrafluoroethylene (PTFE) 260 2.0-2.1
Foamed polytetrafluoroethylene (EPTFE) 260 1.38-1.65
Silica (SIO 2) 1723 1.58
From the above parameters, we can see that silicon dioxide cable has great advantages in improving the withstand power.
(2) Maximum withstanding power comparison of actual cables
The following table shows the maximum withstanding power comparison of cables of almost equal size with different insulating materials (sea level, 20 C):
Name of insulating material, cable specification, maximum withstand power (CW@10GHz), maximum withstand power (CW@0.4GHz)
Polyethylene (PE) RG223 N/A 86
Foamed Polyethylene (FPE) LM195 N/A 250
Polytetrafluoroethylene (PTFE) UT-141C 117.5 660
Foamed Polytetrafluoroethylene (EPTFE) UFB-142A 172 N/A
Silica (SIO 2) S142 1450 N/A
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