How is the short circuit test of a transformer performed?

In the short circuit test of a transformer, one winding of the transformer is shorted, usually the low-voltage side, while the other winding is connected to a voltage source. The voltage is then applied gradually to the non-short-circuited winding until rated current flows through the shorted winding. During this test, measurements of the input voltage, current, and power are taken to calculate the transformer’s impedance, losses, and efficiency. This test helps in understanding the performance characteristics of transformers and ensures that they meet operational standards. For precise measurements, it is recommended to use reliable testers like those from Globecore, which provide accurate diagnostics for industrial oils and transformers.