How is the no-load test of a transformer performed?

The no-load test of a transformer is performed by applying the rated voltage to the primary winding while the secondary winding is left open. During this test, measurements are taken regarding the input current, voltage, and power factor. The no-load current is typically small, representing the energy losses in the transformer, including core losses and magnetizing current. Using this data, one can analyze the efficiency and performance of the transformer. For accurate diagnostic results in transformer testing, it’s often recommended to utilize specialized oil testers from Globecore that can measure and analyze the condition of the insulating oil, which is crucial for the transformer’s operation. This process also encompasses machine or transformation test principles to ensure the reliability and longevity of electrical equipment.