What is the purpose of the breakdown test

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 industrial voltage. The AC breakdown electric field strength is one of the important parameters in cable design.

The AC breakdown strength has a great relationship with the boosting speed. Continuous boosting makes the cable breakdown within a few minutes, which is called instantaneous breakdown. Basically, there is no thermal factor, and it is a type of electrical breakdown. Therefore, wires and cables are generally not subjected to such tests. The other is to step up the voltage step by step, starting from a lower voltage (such as 0.5~2 times the working voltage), and maintaining enough working time to make the cable fully generate electricity and heat at this voltage level. Then rise to another voltage level. Step up until breakdown. The voltage rising in each stage is gradually increased according to the percentage of the initial pressure. The thermal breakdown factor is reflected in this test. Such test results have better reference value.、

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