| 摘要 |
FIELD: electrical engineering. ^ SUBSTANCE: proposed device that has resistor-capacitor reverse-sequence voltage filter, three-phase power supply, two current transformers, two reed relays, rectifier bridge, storage capacitor with discharge resistor, capacitor, final element, phase-meter, two different-structure bipolar transistors, and two optocouplers is provided with newly introduced push-buttons inserted in reverse-sequence voltage filter arms and connected in parallel with one of resistors. ^ EFFECT: enhanced reliability of three-phase motor protection against unbalanced operation. ^ 1 cl, 2 dwg |
