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Back To Basics

Helping the Customer with Transformers

We have covered a wide range of transformer fundamentals in this module. This information will help you in matching a transformer to an application.

Conduct a short interview with the customer to determine their needs. This list of questions is not all-inclusive for every transformer, but it will certainly get you started in the right direction.

  • What is the intended use of the transformer?

With this question, you can usually select a transformer type from those covered in this module.

  • Power – supplies power to distribution systems
  • Distribution - supplies low voltage power to homes, offices and facilities
  • Autotransformer - transform between two high-voltage circuits
  • Isolation - isolate the grounded conductor of a power line from the chassis
  • Instrument – steps down high values of current or voltage to lower levels for meter reading
  • Current – measuring current
  • Potential – measuring voltage
  • Do you need the transformer to step up or step down the voltage?
  • What is the incoming power?
  • What is the required outgoing power?
  • What rating (VA, kVA, MVA) is required?
  • Will the transformer be used with single-phase or three-phase power?
  • (For three-phase) Delta or wye connection in the primary? In the secondary?
  • What is the frequency of the electrical system?
  • What, if any, voltage taps will be needed?
  • In what sort of environment will the transformer be placed?

With this question and some follow-up questions, you can usually choose an enclosure type for the transformer.

  • High voltage? Usually an oil-filled
  • Low voltage? Usually a dry type
  • Indoor or outdoor environment? Could be oil filled
  • Caustic? Maybe an encapsulated dry type
  • Is flammability an issue? Maybe dry or silicone filled

Armed with this information, you should be able to consult your product catalog and make a good product recommendation.

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