Winding design based on the hot spot temperature rise of a ±1,100 kV HVDC converter transformer

摘要

This paper briefly introduces the world's first +1,100 kV HVDC transmission project, focusing on the winding design of a converter transformer that was constructed for the project, based on the hot spot temperature rise. The winding temperature rise was first measured during the initial design of the transformer. Then the design of the oil channel was improved and the conductors arrangement was optimized. By changing the oil flow in the line winding and the distribution of eddy-current losses at the winding end, design margin for winding hot spot temperature rise was ensured. Finally, an advanced fibre-optic temperature measurement technology was used to measure the hot spot temperature rise, ensuring the operating life of the converter transformer.