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# Transformer Short Circuit Impedance and Load Impedance Test

##### What is Impedance?

If we define the meaning of the word within the framework of electrical engineering: When voltage is applied to an electrical circuit, the amount of resistance that the circuit exerts against the electric current is called impedance. It is denoted by Z and its unit is Ohm.

Transformer Short Circuit Impedance ; The short-circuit impedance is the percentage of the rated voltage that will be supplied in the primary coil of the transformer so that when the secondary coil is short-circuited, the rated current in the primary coil. The short-circuit impedance is the percentage of the rated voltage that will be supplied in the primary coil of the transformer so that there is rated current in the primary coil when the secondary coil is short-circuited. The short-circuit impedance is the percentage of the rated voltage that will be supplied in the primary coil of the transformer so that when the secondary coil is short-circuited, the rated current in the primary coil.

##### Effect of Impedance Voltage on Transformer

The larger the impedance voltage of the transformer, the smaller the short-circuit current through the transformer, mitigating the impact on the transformer. Therefore, at present, a minimum short-circuit impedance value is required when producing a transformer.

##### Required Value of Impedance Voltage in Transformer

The test results of the short-circuit impedance and load impedance of the transformer differ from the factory value within ±5%, and the difference with the average value of the three-phase or three-phase group is within the range ±2%.