The invention relates to a method for preparing a
high voltage gradient
zinc-
oxide voltage dependent
resistor valve plate, which belongs to the technical field of an electrical material. Firstly, raw materials are compounded according to the
molar percentage of the raw materials, deionized water is added into the compounded
zinc oxide adulterated raw materials as a dispersing agent, a
polyvinyl alcohol water solution is added as a binding agent, the raw materials are ground by
grinding balls which are prepared by pure monox, pulp ground by the
grinding balls is dried and is stirred to form hydrous granular materials by adding the deionized water, the hydrous granular materials are pressed and molded into a plate, the plate is disintegrated, sintered, ground, cleaned and aluminized, and the upper side surface of the plate is insulated. The
voltage-dependent
voltage gradient of the valve plate reaches 400 V / mm, and the
square wave energy absorption density reaches over 250J / cm<3>. The valve plate can be used in an extra-
high voltage GIS can-type arrestor, can effectively simplify the structural design of the extra-
high voltage GIS can-type arrestor, reduce the production and manufacture difficulty and the cost of the arrestor, and increase the internal safe reliability of the arrestor at the same time, thus, the method has good social and
economic benefits.