Transformer insulating oil will gradually deteriorate during the operation of power equipment

resulting in a significant reduction in the electrical

physical and chemical properties of transformer oil. In this paper

the adsorption phase reaction technology is used to solidify hydrophilic SiO_2 nanoparticles on microcrystalline cellulose(MCC)

to prepare modified cellulose dust collector materials with high adsorption performance

to purify and treat dirty transformer oil by combining with electrostatic adsorption technology. For the SiO_2 modified cellulose dust collector material

it can be concluded through the oil purification effect test that

the best preparation condition is dissolution and drying for 12 h

and adding 6 g ethyl orthosilicate(TEOS) as a silicon source. Then

the modified cellulose dust collector material prepared above conditions is placed in the electrostatic oil purification reactor. After synergistically purified by the two methods

the transformer oil's main operational indicators such as moisture reduces from 32.0 mg/L(the initial value) to 23.5 mg/L or less

and other key indexes including medium loss factor

acid value and volume resistivity have reached the national standard of operational oil. It shows that the electrostatic technology combined with modified cellulose adsorbent material can effectively adsorb the impurity particles in the oil.