Power In A Three Phase Motor

Voltage Phase Unbalance of 3 Phase Motors

Example: 220V – 3 phase – 60 Hz. Supply

Readings Are:

215 , 221, 224 volts

1.Find Avg.

215 + 221 + 224 = 660v/3 = 220v

2. Determine max voltage deviation

220v – 215 = 5v

220v – 221 = 1v

220v – 224 = 4v

3. Find voltage imbalance