The CJDY Series manufactured by PowerHV is an impulse voltage testing system that is used for testing impulse voltages of transformers, gas-insulated (GIS), arresters, cables and any other devices that has a high-voltage. This device is capable of developing a lightning impulse voltage, switching impulse voltage and chopping lighting impulse voltage. Moreover, the CJDY impulse voltage testing system applicable for applications like material testing in research or training programs, both factory and on-site testing and etc.