The 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 those concentrated defects that are more dangerous, and plays a decisive role in judging whether electrical equipment can continue to participate in operation. 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, insulating materials, etc., to assess the insulation level of products, discover insulation defects of the test object, and measure the ability to withstand overvoltage. It is widely used in electrical manufacturing departments, power operation departments, scientific research institutions, and universities.