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Electrical performance testing of wires and cables

source:Industry News     Popular:adapter     release time:2021-05-08 10:30:33     Article author:sznbone    

  The power cord testing produced by power cord manufacturers mainly includes conductor DC resistance, insulation resistance, finished product voltage test and insulated wire core voltage test, each of which is very important. Conductor resistance directly reflects the electrical transmission performance of the cable, and directly affects the temperature, life, voltage drop, and fullness of the cable during energized operation. It mainly examines the material and cross-sectional area of the conductor. If the material of the conductor is not good or the cross-sectional area is seriously insufficient , It will cause the DC resistance of the conductor to exceed the standard seriously. This kind of plug power cord will increase the loss when the current passes through the line, cause the cable conductor itself to heat, cause the insulation of the coated conductor to age and crack, cause the power supply line to leak, short-circuit, and even cause Fire endangers the safety of people and property. The standard has strict regulations on the conductor DC resistance value of cables of different specifications, which shall not be greater than the value specified in the standard.

Electrical performance testing of wires and cables(图1)

  Insulation resistance, finished product voltage test and insulated wire-core voltage test all examine the electrical insulation performance of the cable insulation layer and sheath layer. Insulation resistance is to detect the resistance of the insulating material between two conductors. It should be large enough. To insulation protection. The voltage test of the finished product and the voltage test between the insulated wires not only requires the cable to have sufficient insulation capacity, but also requires the insulation or sheath material to be uniform, free of impurities, and sufficiently uniform in thickness. There should be no invisible trachoma, pinholes, etc. on the surface, otherwise it will cause Partial breakdown during the withstand voltage test.


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