FIELD: electricity; motors and pumps.
SUBSTANCE: protection device consists of current transformers, magnetic starter, three-phase AC power supply, rectifier, overload control unit, current-time curve generation unit. The latter unit is comprised of a thermal electrical motor imitator based on operating amplifier with the negative feedback parallel RC coupling, comparator and final control relay. The second operating amplifier with the negative feedback parallel RC coupling is introduced into the thermal imitator. The inverting input of the second operating amplifier is connected to the first operating amplifier output through the scaling resistor. The second operating amplifier output is coupled with the first operating amplifier input through the other scaling resistor.
EFFECT: increased device actuation accuracy and timely tripping of electrical motor.
2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
RU2350000C1 |
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SU868912A1 |
