FIELD: electrical engineering. SUBSTANCE: during warm-up period, heater 1 is shorted out by sequentially reducing time for each half-wave of supply voltage with the aid of thyristor 5 connected across diagonally opposite terminals of rectifier bridge 4. EFFECT: improved service life of heater. 3 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| GEAR FOR CONTROL OVER REVERSIBLE ASYNCHRONOUS ELECTRIC MOTOR | 1989 |
|
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| DEVICE FOR PROTECTING THREE-PHASE MOTOR FROM PHASE-FAULT OPERATION | 0 |
|
SU1525802A2 |
