Measurement method and system of electric field of wire-plate electrode in corona state based on electric-field-induced second harmonic effect

Electric field measurement has a wide range of applications in high voltage field. Most of the traditional electric field measurement methods belong to interventional measurement category, which will cause distortion to the measured electric field. The electric field measurement method based on the electricfield-induced second harmonic (EFISH) effect has the advantages of non-intrusive and high spatial and temporal resolution [1–3]. However, to simulate the spatial synthetic electric field under the actual transmission line during corona discharge, the method of electric field calibration under the wire-plate electrode structure and the measurement of the electric field under the wire under the corona state are not clear.