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EFFECT OF SELF-STARTING OF HIGH-POWER MOTORS ON POWER SUPPLY SYSTEM



The article discusses influence of self-starting of electric motors on power supply system. High-power motors are currently widely used in electrical drive systems of compression, ventilation and pumping plants, etc. When in service, motors can cause instability of load centers due to unstable op era tion. One of the measures aimed to ensure stable operation mode and fault-free power supply of critical electric installations under short-term undervoltage or de-energization of mains is self-starting of electric motor. Self-starting is the recovery of normal operation mode of motors without assistance of personnel after short-term blackout or low undervoltage. Self-starting comes to action after short-term low undervoltage due to nearby fault switched off by guard relay. Restoration of power supply takes place under reduced aggregate capability of power source. An unreasonable increase in the aggregate capabilityof self-starting electric motors can bring negative results in this case. Any de-energized motor develops electromotive force in stator winding during rundown operation. With increasing electromotive force, the voltage recovery current grows and can exceed starting current more than two times.

: 1
2019
ISBN: 0236-1493
: 622.23.05
DOI: 10.25018/0236-1493-2019-01-0-134-140
Authors: Lashchenov M. B.

Authors' Information:
Lashchenov M.B., Graduate Student, e-mail: mixan9524@gmail.com,
National University of Science and Technology MISiS, 119049, Moscow, Russia.

Key words:
Self-starting, asynchronous motor, synchronous motor, voltage, current, motor staring, stator, guard relay, short circuit, wattless power.

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