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To calculate X/R, you must know what X and R are, then simply divide. The transformer test report should provide this information, and if not, there are ANSII standard values that can be used as estimates.

The X value, or the % impedance are usually given explicitly in the test report (sometimes both, but not always). The R value may be given as load loss at the base MVA rating. To find % R, take the load loss (in watts or kilowatts), and divide by the base MVA.

The % impedance is = %R + j%X, so you may need to do some (vector) math to get %X if not explicitly given.

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14y ago
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11y ago

The x resistance of a transformer is calculated by measuring the current flow on either side of the transformer. The difference between the two sides will determine the amount of resistance inside.

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Q: Calculating x r ratio of distribution transformer?
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