Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Increased voltage imbalance and decreased efficiency.
Electrical motors are designed to operate with a high efficiency within some
variation in the electric power supplied. voltage variation should not exceed +/- 10% frequency variation should not exceed +/- 5% combined arithmetic sum of voltage and frequency variation should not exceed 10% voltage imbalance between phases should not exceed 1% Voltage Imbalance Derating Factor
Polyphase Motors - Voltage Imbalance vs. Derating Factor Voltage Imbalance % Derating factor 0 1.00 0.5 1.00 1.5 0.97 2.0 0.95 2.5 0.93 3.0 0.89 3.5 0.85 4.0 0.82 4.5 0.78 5.0 0.76 Related Topics Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors. Related Documents Calculate amps, hp and kVA for electrical motors. Calculate electric motor efficiency. Inductive loads and power factors with electrical three-phase motors.
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