FIELD: electrical engineering; power supply systems. SUBSTANCE: device has three undervoltage relays with make and break contacts, correcting capacitors, phase-shifting reactors, and transient-load terminals. Three newly introduced phase-correcting capacitors are inserted between phase-shifting reactors and three-phase load terminals; each capacitor is shorted out by parallel-connected make contacts of undervoltage relays of inherent and lagging phases; each phase-shifting reactor is shorted out by parallel-connected contacts of undervoltage relays of adjacent phases. EFFECT: improved characteristics of electric power. 2 dwg
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