This device is a testing equipment independently developed by our company, which combines the advantages of similar products at home and abroad. It is mainly used for testing projects such as primary busbar protection and the transformation ratio of various current transformers. Due to the use of low-power, high-capacity self coupling voltage regulators and converters made of high permeability iron cores, it has the advantages of high output power, small size, and light weight. It is widely used in scientific research, production, and electrical testing sites of enterprises such as power, railway, petrochemical, metallurgical, and mining.