Insulation strength of wire and cable refers to the insulation structure and insulation materials to withstand the role of electric field without breakdown of the ability to break, in order to check the quality of wire and cable products to ensure safe operation of the product, all insulated types of wire and cable are generally carried out dielectric strength test.
Insulation strength test can be divided into pressure test and breakdown test. The withstand voltage test is to apply a certain voltage to the test article under certain conditions. After a certain period of time, it is necessary to judge whether the test specimen is qualified. Time voltage is generally higher than the rated voltage of the test product, the specific voltage and pressure time, product standards are provided.
Through the pressure test can test the reliability of the product under the operating voltage and found that the serious defects in the insulation can also be found in the production process of some shortcomings, such as: insulation has serious external damage, the conductor has a sharp distortion of the electric field ; Insulation in the production of penetrating defects or large conductive impurities.
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