363 / | HD | ELECTRIC POWER CONVERSION SYSTEMS |
1 | DF | CASCADED OR COMBINED, DIVERSE CONVERSIONS IN WHICH THE FREQUENCY OR PHASE OR COMBINED CONVERSION IS WITHOUT INTERMEDIATE CONVERSION TO D.C. {3} |
9 | DF | .~ Combined phase and frequency conversion (i.e., Ph1f1-Ph2f2) {3} |
12 | .~.~ By saturable reactor converter |