Composite housing type lightning arrester

Abstract

The lightning arrester includes composite housing (5), valve body setup in cavity of composite housing (5) fixedly, upper metal electrode fixed on top part of the valve body, and lower metal electrode fixed on low part of the valve body. Characters are that the valve body is in columned long bar shape. Ratio between thickness H of long bar type valve body and diameter D is larger than 2. the lightning arrester features high mechanical strength fewer manufacturing steps.

Description

Technical field [0001] The invention relates to a lightning arrester. Background technique [0002] In the prior art, the main component of the composite metal oxide arrester for 6-35kV power system is a disc-shaped or ring-shaped metal oxide non-linear resistance piece, hereinafter referred to as the valve piece, see attached figure 1 Or 2. The main processing procedures of the valve disc are: (1) After calcining, grinding, adding binders and other additives to the metal oxide raw materials with a good proportion, in the pressure spray drying granulator Create particles distributed according to particle size for better compression molding. (2) Put the pelletized material into a cylindrical mold and press it into a round cake with a diameter of D and a thickness of H in a hydraulic press (see attached figure 1 ) Or circular ring (see attached figure 2 ) Valve disc body. (3) Heat to remove the binder and other additives in the valve disc body, pre-f...

AI Technical Summary

Problems solved by technology

[0005] Using the method of floating pressurization and vibration can make H / D reach or slightly exceed 1, but there is no report of exceeding 1.5

[0006] (2) The density of the valve plate is uneven when the valve plate is pressed too thick, which eventually leads to the uneven density of the valve plate after production

When the overvoltage is discharged, the current density flowing through the unit area of ​​the valve is also uneven, which will cause local breakdown

[0007] (3) When the valve plate is too thick, it is difficult to realize the tooling required for grinding the plate and spraying aluminum on both ends

[0008] (4) Limited by the parameters of the electrical test equipment for spot check of the valve plate, the valve plate is too thick, and the electrical spot check test is difficult

[0009] (5) Arresters are classified according to different places of use in our country. The electrical parameters of valve plates with the same diameter and thickness are certain. The arresters in the same use place use valve plates with the same diameter and the same thickness. The electrical performance parameters of the arrester are different, so valve plates with the same diameter and the same thickness will be used to superimpose. At this time, too thick valve plates cannot meet the matching requirements required by the electrical parameters of the arrester. For example, adding too much, subtracting too little, Half slices cannot be superimposed

[0017] To sum up, there is no valve body with H / D greater than 1.5 in the prior art, which is mainly caused by technical prejudice. Since there are multiple existing valve bodies, each piece needs to be formed, ground, aluminum sprayed, The side is coated with high-resistance and insulating glaze, various electrical performance tests, etc., and there are many processing procedures

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