DC withstand voltage test is a destructive test used to test the insulation performance of electrical equipment. The following is a detailed explanation about the DC withstand voltage test:
definition
The DC withstand voltage test is conducted by applying a high DC voltage to electrical equipment to test the insulation strength and withstand capacity of the equipment under the action of a high voltage electric field. This type of test belongs to destructive testing, as it can cause a certain degree of damage to the equipment during the testing process.
objective
Determine the maximum peak voltage: Through the DC withstand voltage test, the maximum peak voltage that the equipment can withstand under high voltage testing can be detected, providing a basis for determining the range of use of the equipment and selecting the range of the equipment.
Discovering insulation defects: DC withstand voltage testing can effectively detect overall insulation defects such as moisture and dirt, as well as local insulation defects through the relationship curve between current and leakage current.
characteristic
Low destructive power: Due to the fact that insulation does not produce dielectric loss under DC voltage, the destructive power of DC withstand voltage on insulation is relatively small.
Small capacity of testing equipment: Due to the low leakage current required for DC withstand voltage, the required testing equipment has a small capacity and is easy to carry.
Discovering local defects is more effective: DC withstand voltage testing has special significance in detecting certain local defects, such as cracks in porcelain insulation, internal moisture in interlayer insulation, and local loose fractures.