Electrical Engineering · Transformers
In the parallel operation of three-phase transformers, stable load sharing and avoidance of circulating currents depend on specific compatibility criteria between the units. Which of the following sets of conditions must be satisfied for successful parallel operation?
- 1Unequal secondary voltages help minimize circulating currents under load
- 2Equal kVA ratings alone are sufficient for balanced load division
- 3Transformers connected with different vector groups can share load efficiently if their capacities differ
- 4Proper matching of voltage, polarity and phase sequence is essential✓
Correct answer
Proper matching of voltage, polarity and phase sequence is essential
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