Research and on-site implementation of converter transformer load diagnostic test applying total loss current

Load diagnosis test to fault converter transformer is an important method of fault diagnosis, which can effectively judge whether exits internal electric current-heated failure. This paper summarizes and analyzes load diagnosis test device, method, calculation, and on-site implementation of a fault converter transformer in the Gui-Guang HVDC Gaopo converter station. The load diagnosis test under total loss current was carried out for the first time, studied, and adopted a new method of taking filtering capacitor as a compensation capacitor tower, gave the total loss equivalent current load test methods and processes, and eventually found the cause of fault, and the test is successfully completed.