Online calibration system for electronic voltage transformer

The utility model relates to an online calibration system for an electronic voltage transformer. The online calibration system comprises a standard channel voltage transformer on a high-voltage side, a receiving end on a low-voltage side and an upper computer. The online calibration system is characterized in that the receiving end on the low-voltage side is connected with the upper computer through a serial connecting line, the receiving end on the low-voltage side is connected with a standard voltage transformer wiring terminal of the standard channel voltage transformer on the high-voltage side through a signal transmission line, and a grading ring of the standard channel voltage transformer on the high-voltage side is automatically overlapped with a primary bus bar through an automatic lifting device. By controlling the automatic lifting of the lifting device fixed on the standard voltage transformer through a remote controller, the automatic overlapping of the grading ring of the standard voltage transformer and the primary bus bar is realized, the controllability and the personal safety during field operation are guaranteed, high-precision online calibration of the electronic voltage transformer is realized, and the difficulty of field operation is greatly reduced.