Impulse voltage generator output voltage amplitude V2m and charging voltage п The ratio of V is called the efficiency of the generator η, Namely η= (V2m/nV) x 100% For lightning shock waves, η Generally about 80%; For operating shock waves, η Sometimes only 60%. Impulse voltage waveform parameters T1 (Tcr), T2 and generator efficiency η It is related to the circuit structure and parameters, and needs to be adjusted and determined through actual debugging. For power equipment with windings such as power transformers, lightning impulse cutoff tests are usually required. The impulse voltage generator can generate an impulse cutoff wave by connecting an external cutoff gap. Standard lightning cutoff refers to the standard lightning shock wave passing through 2-5 μ Truncated waveform. The impulse voltage generator is one of the basic testing equipment in high-voltage laboratories. At present, the highest rated wire for impulse voltage generators built in China is 6MV, and some countries have individual wires as high as 10MV.