“…The dielectric properties of doped polyethylene are improved by using special effects under nanometer size [ 3 , 4 , 5 ] and interfacial effect between nanoparticles and polyethylene matrix particularly [ 6 ]. Various studies have shown that a small amount of nanodoping can significantly improve the dielectric properties of polyethylene, such as increasing its breakdown field strength, reducing its conductance under high electric field, reducing space charge accumulation and so on [ 7 , 8 , 9 ]. Common nanodopants are nano-inorganic oxides such as nano SiO 2 , Al 2 O 3 , MgO, TiO 2 , ZnO and so on [ 10 , 11 , 12 , 13 , 14 ].…”