Transformer paralleling enhances
- Reliability,
- Redundancy and
- Load flexibility
but only if the engineering foundations are followed correctly.
Even small differences might cause
- Circulating currents,
- Uneven load distribution,
- Overheating and
- Protection risks.
Key factors required for effective parallel operation:
- Power Rating enables proportional load sharing.
- Voltage Rating and Tap Settings: Prevents circulating currents
- Percentage Impedance (%Z) and X/R Ratio determine load division & fault condition.
- The winding configuration and phase shift need to coincide.
- Frequency is essential for stable operation.
Using ETAP, a full practical analysis was performed to demonstrate how each of these parameters affects real-world transformer performance when run together.
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