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Back To Basics
Helping the Customer with Transformers
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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.
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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