Electrical performance testing
Electrical performance testing mainly includes conductor DC resistance testing, insulation resistance testing, and finished product voltage testing.
1. The DC resistance of the conductor reflects the electrical transmission performance of the cable, and directly affects the temperature, life, voltage drop, and operational safety of the cable during energized operation. Conductor resistance is mainly affected by the conductor material and cross-sectional area. If the purity of the conductor is low or the cross-section of the conductor does not meet the design requirements, the DC resistance of the conductor will exceed the standard. If this kind of cable is laid in the line, it will increase the current loss, cause the cable conductor to heat up, accelerate the aging of the insulation, and even cause leakage and short circuit. In severe cases, it will cause a fire and endanger the safety of people and property. In the national product standards, there are clear regulations on the conductor DC resistance of cables of different specifications, and the products must meet the standard requirements when they leave the factory.
2. Insulation resistance mainly examines the electrical insulation performance of the cable insulation layer. When the conductor is energized, the insulation layer will play its insulating role to prevent current from leaking through the insulation layer. If this index is unqualified, it will not only cause major safety accidents, but also Will directly endanger personal safety.
3.The finished cable withstand voltage test mainly assesses the reliability of the product under working voltage and finds serious defects in the insulation, but the most important thing is to find the defects in the process, such as: external damage in the insulation, electric field on the conductor Serious defects such as sharp distortion. Of course, insulation thickness, insulation density, and insulation appearance are also the inspection objects of the withstand voltage test.