Abstract
Ratio correction factor and phase displacement of instrument transformers vary with the values of the external burden connected to the secondary of the transformers. Using the values measured at two burdens of the instrument transformers, the ratio correction factor and phase displacement at arbitrary burdens are theoretically obtained without any additional measurement. This is based on a theoretical analysis of the equivalent circuits of the instrument transformers. The validity of the methods was verified by comparing the theoretical value with measured value for several instrument transformers with different accuracy.
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