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Preparation of high voltage gradient zinc oxide varistor valve

A technology of varistor and zinc oxide, applied in the direction of varistor, varistor core, overvoltage protection resistor, etc., can solve the problems of difficult structural design of arrester, uneven distribution of arrester potential, etc., to improve safety Reliability, size and weight reduction, social and economic benefits

Active Publication Date: 2009-03-11
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

For the development of UHV GIS tank arresters, the biggest technical difficulties are the structural design difficulties brought about by the extraordinary volume and weight of the arrester itself, as well as the extremely uneven distribution of the overall potential of the arrester.

Method used

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  • Preparation of high voltage gradient zinc oxide varistor valve
  • Preparation of high voltage gradient zinc oxide varistor valve
  • Preparation of high voltage gradient zinc oxide varistor valve

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preparation example Construction

[0043] The preparation method of the high voltage gradient zinc oxide varistor valve plate proposed by the present invention comprises the following steps:

[0044] (1) Raw material preparation: prepare according to the mole percentage of raw materials, and the specific formula is as follows:

[0045] Zinc oxide: 90.29mol%, bismuth oxide: 0.7mol%, manganese oxide: 0.75mol%, cobalt oxide: 1.75mol%, nickel oxide: 0.75mol%, chromium oxide: 1.75mol%, antimony oxide: 1.0mol%, oxide Silicon: 1.25mol%, yttrium oxide: 1.0mol%, zirconia: 0.75mol%, aluminum nitrate: 0.005mol%, silver oxide: 0.005mol%;

[0046] (2) Mixed grinding: In the zinc oxide doped raw material prepared above, add deionized water as a dispersant according to 1.5-2 times the weight of the raw material, and add a concentration of 7-10wt according to 2-5wt% of the weight of the raw material % of polyvinyl alcohol (PVA) aqueous solution is used as a binding agent, and is ground with grinding balls made of pure silicon...

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Abstract

The invention relates to a method for preparing a high voltage gradient zinc-oxide voltage dependent resistor valve plate, which belongs to the technical field of an electrical material. Firstly, raw materials are compounded according to the molar percentage of the raw materials, deionized water is added into the compounded zinc oxide adulterated raw materials as a dispersing agent, a polyvinyl alcohol water solution is added as a binding agent, the raw materials are ground by grinding balls which are prepared by pure monox, pulp ground by the grinding balls is dried and is stirred to form hydrous granular materials by adding the deionized water, the hydrous granular materials are pressed and molded into a plate, the plate is disintegrated, sintered, ground, cleaned and aluminized, and the upper side surface of the plate is insulated. The voltage-dependent voltage gradient of the valve plate reaches 400 V / mm, and the square wave energy absorption density reaches over 250J / cm<3>. The valve plate can be used in an extra-high voltage GIS can-type arrestor, can effectively simplify the structural design of the extra-high voltage GIS can-type arrestor, reduce the production and manufacture difficulty and the cost of the arrestor, and increase the internal safe reliability of the arrestor at the same time, thus, the method has good social and economic benefits.

Description

technical field [0001] The invention relates to a preparation method of a high-voltage gradient zinc oxide varistor valve plate, in particular to a new high-voltage gradient zinc oxide suitable for a tank-type surge arrester with a UHV sulfur hexafluoride tank structure (hereinafter referred to as GIS). The invention discloses a method for preparing a piezoresistor, which belongs to the technical field of electrical materials. Background technique [0002] Zinc oxide varistor is a multi-component metal oxide polycrystalline semiconductor ceramic, which uses zinc oxide (ZnO) as the main raw material and adds various metal oxide components (Bi 2 o 3 , MnO 2 、Co 2 o 3 、Cr 2 o 3 , Sb 2 o 3 , SiO 2 、Pr 2 o 3 / Pr 6 o 11 etc.), prepared by a typical ceramic material process. The sintered zinc oxide varistor has excellent nonlinear volt-ampere characteristics and impact energy absorption capacity, so it is widely used in lightning arresters in power systems to absorb v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/112H01C7/12H01C17/00H01C17/30
Inventor 何金良胡军陈水明曾嵘张波
Owner TSINGHUA UNIV
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