Single Phasing of 3ϕ I.M :
When one of the supply lines of the three phase supply connection gets disconnected then this situation is known as single phasing. Under this condition, motor continues to operate on two-phase supply. If the motor is loaded to its rated full load, it will draw excessive current on single phasing. Single phasing may cause extreme magnetic unbalance, reduction in torque and over- heating due to negative phase sequence current. This condition may cause damage to the motor. Hence protection against single phasing is necessary.
Single Phase Preventer:
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