Comparison of Balanced and Unbalanced Three Phase Load:
Balanced load
1. Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts.
2. All the phase voltages have equal magnitude but displaced from each other by 120. Similar is the case with phase currents.
3. All the line voltages have equal magnitude but displaced from each other by 120. Similar is the case with line currents.
4. Phase angle of impedances are equal.
Example circuit:
Unbalanced load
1. When the magnitudes and phase angles of three impedances are differ from each other, then it is called as unbalanced load.
2. All the phase voltages do not have equal magnitude and may not be displaced by 120. Similar is the case with phase currents.
3. All the line voltages do not have equal magnitude and may not be displaced by 120. Similar is the case with line currents.
4. Phase angles of impedances are not equal.
Example circuit:
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