What is a preventive test?

High voltage electrical equipment is also a safety tool for live work, and they all have their own insulation structures. When these equipment and devices operate, they are subjected to internal and external overvoltages well above the normal operating voltage rating, which can cause faults in the insulating structure and become latent faults. On the other hand, along with the operation process, the insulation itself will also degrade due to heat generation and aging under natural conditions. Preventive testing is a set of systematic methods and methods for diagnosing and testing insulation performance developed to address these problems and possibilities and to prevent accidents caused by changes in the insulation performance of electrical equipment in operation.