||Development of a DC -1 MV Insulating Transformer for Neutral Beam Injectors
IEEJ Transactions on Electrical and Electronic Engineering
220 , 2017-03 , WILEY
A dc -1 MV insulating transformer has been developed for the power supply of the neutral beam injector (NBI) at ITER. A dc long pulse -1 MV insulation structure between the primary and secondary windings, considering potential variation in the insulator for dc long pulse, has been designed. Simultaneous development of a compound bushing which consists of an ac 500 kV condenser bushing inside a cylindrical fiber reinforced plastic (FRP) tube has been carried out. The dc -1 MV insulation design has been verified by high voltage insulation tests of ac 50 Hz 1300 kV peak for 1 minute; dc -1200 kV for one hour; and a long duration test of dc -1060 kV for 5 hours. These results showed that the insulating transformer satisfy the power supply requirements for the ITER NBI.