A New Kind of Field Calibration Equipment for Electronic Transformer

As the rapid development of electronic transformer in digital electrical substation, a new kind of calibration equipment for the field calibration of the electronic transformer is needed. In this paper, an equipment for the calibration of both those electronic transformers whose secondary outputs are digital signals and the ones whose secondary outputs are small analogue signals is presented. A special compensation algorithm is used to reduce spectral leakage, so the system is insensitive to frequency fluctuation of measured signal. The principle of design is described, and experimental results are presented.