Question on transformers in parallel

In summary, transformers in parallel are connected together to increase the total power handling capacity. The output voltage remains the same, but the total output current is divided among the transformers. This allows for a more efficient distribution of electricity and reduces the likelihood of overloading a single transformer. However, the transformers must have the same voltage ratio and phase shift to work properly in parallel.
  • #1
Idea04
194
1
My question is if you connect multiple transformers together with the secondaries in parallel, how do you calculate the sum current from the transformers. Is the current calculated by dividing the voltage on the secondary winding by the impedance of the secondary windings.
Or is it based on the turn ratio.
 
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  • #2
Running two IDENTICAL secondaries in parallel will double you current. The voltage will stay the same. But:

Don't do it! Any slight difference in winding impedance will create a circular current from one transformer to the next that will do you no good but will heat up the transformers. Running secondaries in series is OK, provided insulation limits are not breached.
 
  • #3
Running secondaries in series is not applicable and it is not advisable to parallel operate power transformers with widely different power ratings as the natural impedance for optimal design varies with the rating of the transformer.
The power divides between parallel-connected transformers in a relationship which is inversely proportional to their impedances; a low-impedance transformer operated in parallel with a higher-impedance unit will pass the greater part of the power and may be overloaded. A mismatch in loading of up to 10 per cent is normally acceptable.
For more information you can refer to Transformer Riddle No.41 from http://electrical-riddles.com
 

Related to Question on transformers in parallel

1. What is the purpose of connecting transformers in parallel?

Connecting transformers in parallel allows for increased power output and load sharing. It also provides redundancy in case one transformer fails.

2. How do you determine the voltage and current in a parallel transformer circuit?

The voltage and current in a parallel transformer circuit can be determined by using the transformer equation V1/N1 = V2/N2, where V1 and N1 are the primary voltage and turns, and V2 and N2 are the secondary voltage and turns.

3. What are the precautions to take when connecting transformers in parallel?

It is important to ensure that the transformers have the same voltage and frequency rating. The impedance and turns ratio should also be similar. It is also recommended to use fuses or circuit breakers for each transformer to prevent overloading.

4. Can different types of transformers be connected in parallel?

No, different types of transformers should not be connected in parallel as they may have different characteristics and can result in unequal load sharing and potential damage to the transformers.

5. What is the effect of adding more transformers in parallel?

Adding more transformers in parallel increases the overall power output and load sharing capability. However, it also increases the complexity of the system and the potential for failures and maintenance. It is important to carefully consider the need for additional transformers in a parallel circuit.

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