The field strength distribution of series dielectric in DC electric field is

unlike in AC electric field

mainly decided by their volume resistivity ratio in addition to the enhancement effect of space-charge.The liquid and solid dielectric normally for power capacitor

due to obvious difference in its relative permittivity and volume resistivity

make unavoidably influence on the application in DC electric field and AC 50 Hz electric field after their recombination.Through the test and study of liquid

solid and recombination dielectrics under DC and AC breakdown voltage

preliminary knowledge about the feature difference of same kind of material in different electric field is obtained so to provide fundamental reference data for the development of DC power capacitor.