Effect of Type of Insulating Kraft Pulp on Electrical Properties of Oil-paper

Kraft pulp used by Chinese insulating paper manufacturers is mainly dependent on imports because of limited forest resources and related policies. In order to find a more suitable kind of pulp to enhance electrical performances of oil-paper used in ultra-high voltage equipment. Four kinds of electrical grade pulps from different international suppliers were used to prepare presspaper samples, namely ASPA pulp, Domtar pulp, Prince George pulp and Pitkyaranta pulp. Corresponding oil-paper samples were got through vacuum impregnation. Volume resistivity, dielectric properties and AC breakdown strength of the obtained samples were analysed and compared. Results show that all the oil-paper samples have good insulation performances, volume resistivity values and dielectric permittivity results…