The new TTRU3 three power three-phase transformer ratio tester adopts a revolutionary design and has comprehensive transformer measurement functions, including step-up ratio testing for low-voltage side pressurization. TTRU3 is an important tool for diagnosing the mechanical condition of transformers. All transformation ratio tests are completed by one instrument using a set of three-phase connecting wires. TTRU3 is equipped with the latest 7-inch color touch screen, which can be optionally paired with a printer, so the possibility of result loss is relatively low; It is also possible to remotely control and download the results to USB storage through PC, and the two functions complement and assist each other.