Linking Transformers in Series: Voltage Compatibility and Polarity Concerns

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SUMMARY

Linking transformers in series with different rated voltages is feasible, primarily to achieve a higher secondary output voltage by connecting lower voltage secondaries. However, it is crucial to maintain correct phase alignment; incorrect connections result in voltage subtraction rather than addition. The transformers' rated voltage and current must not be exceeded, and careful consideration of polarity is necessary to avoid adverse voltage combinations. Applications often involve multi-configuration transformers for varying voltage requirements, such as 110Vrms and 220Vrms.

PREREQUISITES
  • Understanding of transformer operation and configurations
  • Knowledge of voltage ratings and current limits
  • Familiarity with phase alignment in electrical systems
  • Basic principles of delta and star (Y) connections
NEXT STEPS
  • Research "Transformer Series Connection Guidelines" for best practices
  • Study "Phase Alignment Techniques in Transformer Connections" for detailed methods
  • Explore "Delta and Star Transformer Configurations" for practical applications
  • Investigate "Voltage Compatibility in Transformer Systems" for safety measures
USEFUL FOR

Electrical engineers, power system designers, and technicians involved in transformer applications and configurations will benefit from this discussion.

danilorj
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hi guys,
I want to know if it is always possible to link two transformers in series with different rated voltage. And if there is any concern about the polarity.
If it is not possible in which conditions it can be done?
 
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danilorj said:
hi guys,
I want to know if it is always possible to link two transformers in series with different rated voltage. And if there is any concern about the polarity.
If it is not possible in which conditions it can be done?

What do you mean by linking them in series? Why would you do that? It's done in some multi-configuration transformers (like ones that are used in both 110Vrms and 220Vrms applications), but in general, I don't know why you would do this. Can you explain the context a bit more?
 
Yes, you can connect transformer primaries or secondaries in series.

You just have to be careful not to exceed the rated voltage or current of either device.

It is most often done to get a higher voltage on a secondary output by connecting lower voltage secondaries in series.
It is important to get the phase right, but if you get it wrong, the voltages just subtract rather than add.
Nothing bad happens, so you just reconnect them.

Do you have an application that may need this?
 
Ok. When I link three monofasic transformers in delta or star what are the concerns to take about the polarity, capacity, rated current and tension?
 
Be sure to preserve phase from primary to secondary, or you will end up with some peculiar voltage combinations. You don't want to exceed the transformer's VA rating in any given leg.

It's also possible to convert from delta to Y, or Y to delta using three single phase transformers, by the way.
 
danilorj said:
Ok. When I link three monofasic transformers in delta or star what are the concerns to take about the polarity, capacity, rated current and tension?
I like this winding configuration paper which may be of interest to you.
"www.basler.com/downloads/3phXfmrs.pdf"[/URL]
 
Last edited by a moderator:
Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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