A Method for the Evaluation of Uncertainty in the Measurement of Transformer Capacity

The evaluation and expression of uncertainty is one of the fundamental issues in metrology. Transformers are not only widely used in power systems, but also one of the key and expensive components. This paper studies the measurement principles and evaluation methods of uncertainty in capacity measurement of transformers. It proposes a supplement to the uncertainty evaluation method for capacity measurement of power transformers in the Guide to the Expression of Uncertainty in Measurement (GUM) and its application. Finally, the paper analyzes the effects of different factors on measurement uncertainty and obtains the expanded uncertainty of transformer capacity measurement. The research results are of great significance for improving the quality of transformer capacity measurement.