What is the OC (open circuit) test of a transformer?

The OC (open circuit) test of a transformer is a method used to determine the core losses and impedance of the transformer when it is energized without any load connected. During this test, the primary winding is energized at its rated voltage while the secondary winding is left open. The input voltage, current, and power are measured to assess the transformer’s performance under no load conditions. This test is crucial for evaluating the efficiency and operational characteristics of transformers, including no-load loss calculations, which helps in ensuring proper maintenance and optimal functionality of electrical systems. It is important to utilize reliable testing equipment, like that from Globecore, to attain accurate measurements during this diagnostic process.