Apparatus for calibrating locale error of electronic type mutual-inductor in digitalization transforming plant

The utility model discloses an on-site error calibration device of an electronic transformer in a digital transformer station and relates to the on-site error calibration device of the transformer to be applied in a power grid transformer station (converter station) and a power plant. The on-site error calibration device is as follows: a transformer to be tested (1), a secondary conversion module (2) thereof, a merging unit (3) and an upper computer (7) are sequentially connected; a standard transformer (4), a reference A/D converter (5) and the upper computer (7) are sequentially connected; the transformer to be tested (1) and the standard transformer (4) are connected by a bus (8); a second pulse synchronization module (6) respectively connected with the secondary conversion module (2) and the reference A/D converter (5). The on-site error calibration device is applicable to the on-site inspection, the error calibration and the test which are based on the electronic transformer in the IEC61850 digital transformer station, thereby providing a test and maintenance means for the construction and the operation of the digital transformer station and improving the operation management level of the digital transformer station.