Partial discharge test oil cup for oil-paper insulation

Abstract

A partial discharge test oil cup for oil-paper insulation is characterized in that the partial discharge test oil cup comprises a polymethyl methacrylate tube which has a smooth inner wall; the upper opening of the polymethyl methacrylate tube is provided with a polymethyl methacrylate upper cover, and the lower opening is provided with an aluminum lower cover; the polymethyl methacrylate upper cover is provided with a through hole at the central part; a first metal guide rod penetrates through the through hole; a sink hole is arranged at the middle part of the top surface of the aluminum lower cover; a vertical second metal guide rod is fixed in the sink hole; the upper end of the second metal guide rod is inserted into the sink hole at the bottom surface of a brass circular-plate-shaped electrode; an annular polymethyl methacrylate pressure plate is arranged between the first metal guide rod and the brass circular-plate-shaped electrode; the brass circular-plate-shaped electrode pressure plate is in vertically movable clearance fit with the brass circular-plate-shaped electrode tube; the internal diameter of the brass circular-plate-shaped electrode pressure plate is smaller than that of the circular-plate-shaped electrode; the upper end of the first metal guide rod is connected with a high-voltage power supply; and the aluminum lower cover is connected with a ground wire. High-voltage electrode replacement and adjustment for space between the high-voltage electrode and a grounding electrode are facilitated. The insulation paper is flattened and fixed at a required position and does not float.

Description

technical field [0001] The invention relates to an oil-paper insulation partial discharge test oil cup. Background technique [0002] Oil-paper insulation is widely used in power systems. The insulation system of oil-immersed transformers is mainly composed of liquid insulation and solid insulation. The solid insulation is oil-paper insulation. As an important part of the insulation system, transformer oil paper is affected by multi-factor aging such as temperature, electric field, oxygen, moisture and metal impurities for a long time during operation, and the insulation performance decreases, which directly threatens the safe operation of the transformer. In particular, due to the partial discharge caused by the internal defects of the oil-paper insulation, the breakdown of the insulation material and the power failure of the equipment occur from time to time, and the interruption of the power supply has caused huge economic losses. [0003] At present, there have been man...

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Problems solved by technology

The oil cylinders in the prior art devices often have problems such as the difficulty of replacing the needle electrode at the high voltage end, the inconvenient adjustment of the distance between the needle electrode at the high voltage end and the grounding metal electrode, and the inability to press a single sheet of insulating paper.

[0004] In addition, the compression method of the prior art prevents the air bubbles generated between the insulating paper and the metal plate from separating from the insulating paper, forming an air gap between the insulating paper and the metal plate, which affects the test results

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