Reliability of the TJ-II power supply system: Collection and analysis of the operational experience data

During a TJ-II pulse, the provision of magnetic fields requires a total amount of power exceeding 80 MVA. Such amount of power is supplied by a 132 MVA flywheel generator (15 kV output voltage, 80–100 Hz output frequency) and the related motor, transformers, breakers, rectifiers, regulators, protections, busbars, connections, etc. Failure data of these main components have been collected identified and processed including information on failure modes and, where possible, causes of the failures. Main statistical values about failure rates for the period from May of 1998 to December of 2004 have been calculated and are ready to be compared with those of the International Fusion Component Failure Rate Database (FCFR-DB).