323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
304 | DF | SELF-REGULATING (E.G., NONRETROACTIVE) {2} |
305 | DF | .~ Using a transformer or inductor as the final control device {2} |
306 | DF | .~.~ Ferroresonant {2} |
308 | DF | .~.~.~ With core having an air gap or magnetic shunt {1} |
309 | .~.~.~.~ Including a ferrocapacitor across a tertiary winding |