Wideband transient voltage measurement is expected to be widely applied in future power systems. One of the methods with the most technical and economical benefits for widely-equipped wideband transient measurement in power system is to upgrade the existing potential transformers (PT) to be enabled with wideband transient measurement. A method based on wide-band models and algorithms is proposed for electromagnetic voltage transformers

which involves the nonlinear characteristics and wideband linearity of PT

enabling PT to have the capabilities of wideband transient voltage measurement. The methods include the establishment of a nonlinear wideband model and an inverse calculation method based on output voltage to recover the input voltage waveform. The comprehensive method of PT equivalent circuit model is introduced in detail

and the equivalence method based on circuit theory

energy storage components and nonlinear components is given

as well as an inverse calculation method based on the entire model. A verification experiment is conducted on 10 kV PT taking lightning impulse as the verification source. The experimental results match well with the input waveform recorded by the standard device.