Paralleled Transformers: Why Overload & How to Prevent It?

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Discussion Overview

The discussion centers around the phenomenon of overload in paralleled transformers that have the same turns ratio but different kVA ratings. Participants seek to understand the underlying mathematical and theoretical principles, as well as strategies to prevent overload in such configurations.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant notes that the different impedances of the transformers can lead to unequal sharing of power and current, which may cause the smaller transformer to become overloaded while the larger one remains lightly loaded.
  • Another suggests that load-flow modeling programs can be used to calculate the current and power splits between the transformers, indicating a reliance on computational methods for analysis.
  • A later post warns about the potential creation of a loop when paralleling transformers, emphasizing the need for caution in such setups.

Areas of Agreement / Disagreement

Participants express differing views on the implications of transformer impedance and the methods for analyzing parallel configurations. The discussion remains unresolved regarding the best approaches to prevent transformer overload.

Contextual Notes

The discussion does not clarify specific assumptions regarding transformer characteristics or the conditions under which the overload occurs. The mathematical steps necessary for a complete understanding are also not fully explored.

Nahian
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When transformers with the same turns ratio, but different kVA ratings are paralleled , it is possible for the smaller transformer to be overloaded and the larger transformer to be lightly loaded.Why is it so? Can anyone please show mathematical and theoretical explanation?And what can be done to stop the overloading of the transformer?
 
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The impedances will be different. Therefore, the sharing of power and current between the parallel branches will not necessarily be in proportion to their KVA ratings.

If you can't do the calculations by hand, any load-flow program modeling those transformers in parallel will calculate the splits in current and power.
 
Thanks
 
Nahian said:
When transformers with the same turns ratio, but different kVA ratings are paralleled
Then you are creating a loop - through transformer A and back through transformer B. Be very careful!
 

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