what is the power factor of a transformer at no load?

The power factor of a transformer at no load is typically low, often around 0.1 to 0.2. This low power factor occurs because, at no load, the transformer primarily draws reactive power to energize its magnetic field, resulting in minimal real power consumption. Consequently, the transformer operates with a leading power factor due to the capacitive nature of the magnetizing current, which is necessary for its operation but does not contribute to useful work.