Electrical Engineering ⇒ Topic : Transformer tests

TRANSFORMER TESTS

• The performance of a transformer can be calculated on the basis of its equivalent circuit which contains the following four main parameters :
• Equivalent resistance R₀₁ as referred to primary (or secondary R₀₂).
• Equivalent leakage resistance X₀₁ as referred to primary (or secondary X₀₂).
• Core loss conductance G₀ (or resistance R₀).
• Magnetising susceptance B₀ (or reactance X₀).

These parameters or constants can be determined by the following two tests

1. Open-circuit or no-load test.
2. Short-circuit or impedance test.

The above two tests are convenient to perform and very economical because they furnish the required information without actually loading the transformer