As transformer is the core equipment in power system, its long-term reliable operation is of high significance to the stability and reliability of this system. The DC resistance of transformers must be tested for their delivery, installation and handover, regardless they’re semi-finished or finished transformers. It’s also indispensable in preventive tests for power sector. In this way, manufacturing defects like coil material, welding, loose connection, lack of strands and disconnection can be detected and hidden dangers after it’s put into use can be predicted. Our UHV-S20B is developed by...