Yes , you are right the power factor will decrease .. Actually we can analyse it from the phasor diagram of transformer at no-load.. if Im (magnetizing current) increase , the phase angle will increase , so consequently power factor will decrease..!Babadag said:the power factor could decrease more.
The power factor of a transformer is a measure of its efficiency in converting electrical energy from one form to another. It is the ratio of real power (measured in watts) to apparent power (measured in volt-amperes) and is expressed as a decimal or percentage.
Power factor is important because it affects the overall efficiency and performance of a transformer. A low power factor can result in increased energy losses, leading to higher energy costs and potentially damaging the transformer.
Power factor can be calculated by measuring the real power and apparent power using a power meter, then dividing the real power by the apparent power. Alternatively, it can be calculated using the phase angle between the voltage and current in the transformer.
A low power factor in transformers can be caused by a number of factors, including reactive loads (such as motors or capacitors), long transmission lines, and unbalanced loads. These factors can lead to an imbalance between the real and apparent power, resulting in a low power factor.
Power factor can be improved in transformers by installing power factor correction devices, such as capacitors, to compensate for reactive loads. Proper maintenance and balancing of loads can also help improve power factor. Additionally, using transformers with higher efficiency ratings can also help improve power factor.