Insulating medium high-voltage low-field-intensity test assessment device and method

The invention provides a high-voltage low-field-intensity test assessment device and method for an insulating medium. The device comprises a box body, a high-voltage electrode unit, a grounding electrode unit and a plurality of tested insulating samples, wherein the high-voltage electrode unit, the grounding electrode unit and the plurality of tested insulating samples are arranged in the box body; wherein the tested insulation test object is placed between the high-voltage electrode assembly and the grounding electrode assembly; each of the high-voltage electrode unit and the grounding electrode unit is provided with a plurality of groups of stacked electrode assemblies; insulation angle rings are arranged on the sides, close to the tested insulation test object, of the ends of the high-voltage electrode assembly and the grounding electrode unit. According to the invention, the high-voltage electrode unit and the grounding electrode unit are arranged to be an electrode structure with a plurality of groups of