Electronic Wire Quality Identification Methods Why do electronic wires need a protective coating?

Good and bad identification of the quality of electronic wire, the real test is the need for specialized equipment and instruments. Engineering practice, the following methods can be used for preliminary identification: 1, check the core of the silicone electronic wire: diameter length SYV cable for 0.78 to 0.8mm, SYWV cable for 1.0mm; recently appeared a SYV75-5 core diameter is 1.0mm cable, the cable's characteristic impedance, is certainly not 75 ohms, should not be applied to 75 ohms transmission system. 2, Check the shielding layer braided network: braided number is enough, copper braided network, check the weldability, tinned copper wire scraping to see if the inside is copper wire, aluminum-magnesium alloy wire hardness is significantly greater than the copper wire; braided network is sparse, uneven distribution, and the insulation layer is not tightly wrapped, etc. is a poor cable. 3, check the core wire and the insulation layer of the adhesion: cut the insulation layer obliquely, according to the direction of the stripping pull apart the core wire to see if there is a core wire and the insulation layer of the adhesion process material; a good Cable has a greater adhesion, poor cable no adhesion. Longitudinal tensile test: take a meter of cable, peel off the core in layers, insulation, shielding, outer sheath, each left 10 cm long. Method is: two hands respectively hold the cable adjacent to the two layers, pull in the opposite direction; good cable general force can not be pulled, poor cable can be easily pulled out without great effort. 4, PVC sheath: the surface can be seen inside the compression of the braided mesh regular "unevenness", indicating that the processing technology is good, will not produce relative sliding, is a good cable; appearance Smooth, can not see the "unevenness" of the compression network, pinch the sheath with a loose feeling, is poor cable.

The protective layer of electronic wire in the cable in addition to protecting the inner core and insulation, but also play a role in improving the layout of the electric field, to prevent the conductor appearance of the tip of the rise caused by discharge, reduce the amount of partial discharge, to ensure the utilization of the cable life and reliability. The principle of the protective layer of the electronic cable, rubber cable conductor protective layer to take semi-conductive rubber material processing. Conductor protective layer to take around engaged in the production, around the way the production of the protective layer than around the way the production of twice as slippery without rise, to facilitate the promotion of the average electric field effect. Conductor protective layer thickness selection stems from two aspects of the conditions: one is to ensure that the appearance of the conductor protective layer around the slippery, because the mining rubber cable generally take the fine copper wire stranded in the way of mining cables, and therefore can not engage in the tightening of the pressure, the stranded appearance of the conductor there is a certain level of stranded lines of texture, these heights and lows for the electrical function of the low-voltage cable is not much disturbance, but for high-voltage cable Just into the electric field strength is not average, can only rely on the surrounding or wrapped around the conductor protective layer to lift its disturbance, but too thin conductor protective layer thickness in the process is difficult to achieve; In addition, from an economic point of view, although the conductor protective layer of the thickening of the process is relatively easy to achieve, but the cable thickness of the insulation of every 1 mm will make the cable cable outer diameter increased by 4.3 mm, which will bring about the use of sheathing materials. Must bring a dramatic increase in the use of protective materials, which also brings a substantial increase in the cost of cable manufacturing. In the reference scale are proposed "semi-conductive layer of the disk thickness control in 0.7 mm or so, the actual thickness is not audited. The principle of the protective layer of the electronic wire combined the above two factors, take these two scales with the same conductor protective layer thickness is appropriate. With reference to this condition, the 6/10kv mining rubber cable also put forward the conductor protective layer calculation thickness control 2 mm below, the actual production thickness is also in accordance with the 0.7 mm to engage in the control, but not as a rigid quality indicators to engage in the control of the skill conditions.

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