How is the load shared if percentage impedances of the transformers are different?

When paralleled transformer turn ratios and percent impedances are the same, equal load division will exist on each transformer. When paralleled transformer kVA ratings are the same, but the percent impedances are different, then unequal load division will occur.

How do these transformers share their load?

If two transformers connected in parallel with similar per-unit impedances they will mostly share the load in the ration of their KVA ratings. Here Load is mostly equal because it is possible to have two transformers with equal per-unit impedances but different X/R ratios.

What are the factors which decide the load shared by the transformer?

Let’s name these ten factors:

• Kilovoltampere (kVA) Rating.
• Voltage Ratings, Ratio, and Method of Connection (Delta or Wye)
• Voltage Taps.
• Typical Impedance Values for Power Transformers.
• Insulation Temperature Ratings.
• Insulation Classes.
• Sound Levels.
• Effects of Transformer Failures.

Can two transformers be connected in series?

Yes, it is possible. However, note that there are two ways to “wire the outputs together”, parallel and series. In series, the voltages add at the same current.

Can two transformers be connected in parallel?

It is possible to connect transformers that have different polarities in parallel. You need to remember that you match up the polarities. The supply line polarity determines the primary polarity of the transformer. The primary polarity determines the secondary polarity of the transformer.

Can transformers synchronized?

Synchronization of transformer can be checked by either of following steps: Checked by synchronizing relay and synchronous scope. If Secondary of Transformer is not LT Then we must use check synchronizing relay and Commission the system properly. After connecting relay.

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