A cable is an electrical energy or signal transmission device, usually composed of several wires or groups of wires
Breakdown Test
The breakdown test of cables involves gradually increasing the voltage until insulation breakdown, and obtaining the breakdown voltage value of the cable.
. The purpose of this type of test is to assess the ability of cable insulation to withstand voltage and the safety margin between the working voltage. The strength of AC breakdown electric field is one of the important parameters in cable design. The strength of AC breakdown is closely related to the speed of voltage rise. Continuous voltage rise causes the cable to breakdown within a few minutes, which is called instantaneous breakdown. There is basically no thermal factor and it belongs to the type of electrical breakdown. Therefore, wires and cables are generally not subjected to this type of test. Another method is to gradually increase voltage, starting from a lower voltage (such as 0.5-2 times the working voltage), and maintaining sufficient working time to fully generate electrical and thermal effects in the cable at this voltage level. Then rise to another voltage level. Step by step until breakdown occurs. The voltage that rises at each level increases step by step according to the percentage of initial pressurization. The factor of thermal breakdown was reflected in this experiment. Such experimental results have good reference value. It is often used when studying product characteristicsMaterial usage
Calculation method for weight of copper without conversion: cross-sectional area * 8.89=kg/km, such as 120 square millimeters calculation: 120 * 8.89=1066.8kg/km
1. Conductor usage: (Kg/Km)=d ^ 2 * 0.7854 * G * N * K1 * K2 * C/
d=Copper wire diameter G=Copper specific gravity N=Number of wires K1=Copper wire stranding rate K2=Core wire stranding rate C=Number of insulated core wires
2 Insulation dosage: (Kg/Km)=(D ^ 2- d ^ 2) * 0.7854 * G * C * K2 D=Insulation outer diameter d=Conductor outer diameter G=Insulation specific gravity K2=
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