The problem of three-phase imbalance in 380v motors
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For 380V motors, the operating current is unbalanced; what is the acceptable range for three-phase imbalance? ? ? ? How to choose ammeters and CTs for motors below 10kw
The three-phase deviation current of the motor should be within 5% to be considered normal. When selecting an electric motor ammeter, it is necessary to consider the motor-driven equipment and its rated current; generally, a pointer-type ammeter is used. It is appropriate for the rated current to fall between 1/2 and 2/3 of the ammeter’s scale. The selection of the CT should match that of the ammeter (for example, if the ammeter is selected as 100/5, then the CT should also be 100/5).