Needle-plate electrode corona discharge assembly for AC-DC high voltage test

Abstract

The invention discloses a needle-plate electrode corona discharge assembly for an AC-DC high voltage test; the needle-plate electrode corona discharge assembly comprises a needle array electrode, and an upper metal plate electrode and a lower metal plate electrode; the needle array is nested in the upper metal plate connected with a high voltage generator; the lower metal plate electrode is grounded; the upper and lower metal plate electrodes are respectively connected with an upper insulation plate and a lower insulation plate, and the distance between the upper and lower metal plate electrodes is adjustable; a sample is placed on the lower metal plate electrode and right opposite to the needle array; after the voltage is applied, uniform corona discharge is generated between the needle array electrode and the metal plate electrodes, and the distance between the upper and lower metal plate electrodes can be adjusted so as to respectively carry out charge characteristic test and rapid corona aged test for the sample. The beneficial effects are that the height between the upper and lower metal plate electrodes so as to respectively carry out the charge characteristic test and the rapid corona aged test; the length of the lower metal plate electrode equals to 5-8times of that of the needle array, so corona discharge test can be simultaneously carried out for many samples.

Description

technical field [0001] The invention relates to the technical field of AC and DC high voltage tests, in particular to a needle-plate electrode corona discharge device for AC and DC high voltage tests. Background technique [0002] Polymer dielectrics are widely used in electrical and electronic equipment due to their excellent physical, mechanical and thermal properties. The quality of their insulation performance is directly related to the safe and stable operation of the equipment. In a composite insulation system composed of solid-gas, when a certain voltage is applied to the insulation system, the discharge always occurs first on the solid-gas interface, that is, surface discharge. As the voltage further increases, the surface discharge can develop into a penetrating breakdown, which is called surface flashover. When flashover occurs along the surface, the insulation of the system will fail, which often leads to accidents. There are reports at home and abroad about ele...

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Problems solved by technology

Both require that the needle electrodes used are evenly arranged, but the distance between the needle-plate electrodes is different in the specific test, so the distribution of electrodes used in the two tests is slightly different, and the electrodes used by different test institutions are often quite different. During the characteristic test and the rapid corona aging test, it is often necessary to build the needle array-plate electrode separately, instead of sharing a set of devices

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