GDYD-A series is a new type of intelligent withstand voltage test equipment designed by Guodian Xigao based on the GDYD-D model and the latest national power industry standards. It is a strict, effective, and direct method for identifying the insulation strength of electrical equipment. It can detect concentrated defects that are highly dangerous and plays a decisive role in determining whether electrical equipment can continue to operate. It is an important means to ensure the insulation level of equipment and avoid insulation accidents. It is used for insulation strength tests under specified voltages on various electrical products, electrical components, and insulating materials, to assess the insulation level of products, discover insulation defects in test objects, and measure overvoltage capability. It is widely used in electrical manufacturing departments, power operation departments, scientific research institutions, and universities.