The breakdown test of the cable is to increase the voltage step by step until the insulation breakdown, and obtain the breakdown voltage value of the cable. The purpose of this type of test is to assess the safety margin between the ability of the cable insulation to withstand voltage and the working voltage. The AC breakdown electric field strength is one of the important parameters of cable design.
The AC breakdown strength has a great relationship with the boost speed. Continuous boosting makes the cable breakdown within a few minutes, which is called instant breakdown. There is basically no thermal factor, and it is a type of electrical breakdown. Therefore, wires and cables are generally not subjected to this test. The other is a step-by-step boost, starting from a lower voltage (for example, 0.5 to 2 times the working voltage), and maintaining enough working time to make the cable fully generate electricity and heat in this voltage level. Then rise to another voltage level. Ascend step by step until breakdown. The rising voltage of each stage increases step by step according to the percentage of initial pressure. The factor of thermal breakdown is reflected in this test. Such test results have good reference value. It is often used when researching product characteristics.
Skype: verdecable