AC Transformers

Your AC Transformer FAQ

AC Transformers

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Transformer Impedance

Your AC Transformers FAQ

Transformer Impedance is a term we not be very familiar with but is a transformer rating system much like power, temperature, current, and voltage.  Transformer Impedance is an equally important rating used for electrical equipment, including transformers. 

With a transformer, impedance is a variable comprised of both resistance and reactance.  This variable with transformers is a percentage impedance.  Because the transformer is always interposed between primary and secondary loads, the transformer represents an impedance to current flow from source to load. 

With Transformer Impedance, when current flows through resistance, the resulting loss of energy becomes wasted heat.  When Transformer Impedance is known, the transformer engineering and design can focus on minimizing the resistive components.  For this reason, transformer impedances are treated as reactive in most voltage drop calculations.  The terms percent reactance and percent impedance can, thereby, be used interchangeably

Transformer Impedance can be easily determined with a simple test.    The steps to perform this impedance evaluation are as follows:

• Short circuit secondary terminals.

• Apply low voltage to the primary terminals.

• Increase the voltage until the measured current in the short circuit secondary terminals reaches the rated ampere value. 

• The ratio of the primary voltage to the rated voltage is then multiplied by 100 to give the transformer impedance in percentage form.

Further Questions About Transformer Impedance?

TEMCo understands that you may have many of questions about Transformer Impedance.  Helpful, transformer impedance specialists are standing by to answer any questions you may have regarding transformer impedance.   No matter how simple or complex your question may be, the team at TEMCo is up to the challenge!

All of TEMCo's specialists are fully empowered to offer you the absolute best prices their large inventory of transformers from the top manufacturers in the power source industry.  Many transformers are in stock and ready to ship today.  Also count on TEMCo to ship your transformer quickly at the lowest rates.  For your best pricing on transformers, give TEMCo a call today!  1-510-490-2187 or 1-800-613-2290

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Transformer Impedance

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