Principle for measuring steady-state relaxation polarizability and electric field characteristics of nonlinear insulating dielectric

The invention discloses a principle for measuring steady-state relaxation polarizability and electric field characteristics of a non-linear insulating dielectric, belongs to the field of dielectric parameter measurement of insulating dielectrics, and solves the technical problem that the steady-state relaxation polarizability of the non-linear insulating dielectric cannot be accurately measured. Anonlinear insulating dielectric polarization current time domain spectrum and an open-circuit surface potential attenuation time domain spectrum under the action of direct-current voltages with different amplitudes are measured; the polarization absorption current integrates the time to obtain the final relaxation polarization intensity of the applied voltage, which is the initial relaxation polarization intensity in the surface potential attenuation process; a three-branch nonlinear equivalent circuit model is adopted; through time division linear approximation, the relationship between theconductivity and the elect