High-voltage-resistance electrode apparatus for space charge measurement

Abstract

The invention brings forward a high-voltage-resistance electrode apparatus for space charge measurement. The apparatus comprises a grounding metal plate, a high-voltage metal electrode, a semiconducting layer, an insulation support block, an insulation sleeve, a conducting rod, insulation resin packaging parts, a grounding metal shield, an upper barrier disc, and a lower barrier disc, the insulation support block and the high-voltage metal electrode are positioned in the grounding metal shield filled with the insulation resin packaging parts, the high-voltage metal electrode is positioned under the insulation support block and connected with the insulation support block, the semiconducting layer is arranged under the high-voltage metal electrode and connected with the high-voltage metal electrode, the grounding metal plate is arranged below the grounding metal shield, the upper barrier disc and the lower barrier disc are arranged in the grounding metal shield, the lower barrier disc is arranged below the upper barrier disc, the lower barrier disc is arranged on the upper surface of the grounding metal plate, the insulation sleeve penetrates through the grounding metal shield from a side surface and is connected with a side surface of the upper end part of the high-voltage metal electrode, and the conducting rod connected with the side surface of the upper end part of the high-voltage metal electrode penetrates in the insulation sleeve. According to the apparatus, the flashover voltage along surface of the high-voltage electrode can be increased.

Description

technical field [0001] The invention relates to the technical field of performance testing of solid dielectric materials, in particular to a high withstand voltage electrode device for space charge measurement. Background technique [0002] An important development direction of solid dielectric space charge measurement technology is miniaturization and high withstand voltage. With the increase of the thickness of the tested polymer sample, in order to study the space charge characteristics under high DC field strength, it is necessary to continuously increase the amplitude of the applied voltage. However, limited by the fixed dimensions of the high withstand voltage electrode device used for space charge measurement, surface flashover discharge will occur between the high voltage electrode and the grounded metal shield, as well as between the high voltage electrode and the surface of the tested sample, which limits the test of thick samples. possible. At present, the schem...

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Problems solved by technology

However, the flashover characteristics along the surface have nonlinear characteristics. In order to double the flashover voltage, the size of the grounded metal shield will be greatly enlarged, the difficulty of mold processing will be increased, and the production cost will be greatly increased; (2) The diameter of the sample is enlarged

It can better solve the flashover of the high-voltage electrode bypassing the surface of the sample to the lower electrode, but it cannot solve the discharge problem between the high-voltage electrode and the grounded metal shield, and the production of large-diameter and uniform-thickness samples often requires the same manufacturing process. Difficulties; (3) Add an insulating barrier between the sample and the resin

The core problem of this solution is the interface between the upper barrier plate and the cured insulating resin. On the one hand, if the upper barrier plate is movable, it will be in physical contact with the cured resin, and the airtight effect is not good. On the other hand, if the upper barrier plate The disk is directly cured in the insulating resin. During pouring, there will be bubbles behind the barrier disk, that is, on the side of the resin, which are difficult to eliminate by vacuuming. These bubbles are prone to partial discharge under high electric field, causing insulation damage in advance

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