ZnO resistor disc and preparation method thereof

A technology of zinc oxide resistors and resistors, which is applied in the field of surge arrester piezoresistors, can solve the problem that the key indicators of GIS arrester safety, reliability, flow capacity, potential gradient impact resistance, and aging performance cannot be well matched. and other problems, to achieve the effect of simple preparation process and high technical economy

Active Publication Date: 2019-08-02
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the selection and matching of the basic composition system and additives of zinc oxide resistors and the collaborative optimization control technology of the corresponding sintering molding process have not been well grasped, resulting in the grain size and uniformity of large-sized zinc oxide resistors, and the number of grain boundaries. , phase structure and other microstructures failed to achieve a good comprehensive optimization control, which is manifested in the fact that there is still a certain gap between the comprehensive performance indicators and the use requirements of GIS arresters, that is, key indicators such as flow capacity, potential gradient, impact resistance, and aging performance. Can not be well matched, one ebb and flow, to a certain extent affect the safe operation reliability of GIS arrester

Method used

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  • ZnO resistor disc and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation process of the varistor sheet for the zinc oxide arrester of this example comprises the following steps:

[0032] 1) Ingredients: prepared according to the mass percentage of raw materials, the specific formula is as follows: ZnO: 93%, Bi 2 o 3 : 2.5%, Co 3 o 4 : 0.1%, NiO: 0.2%, MnO: 0.2%, Sb 2 o 3 : 3.0%, SiO 2 : 0.3%, Er 2 o 3 : 0.2%, Ag 2 O: 0.5%.

[0033] 2) Ball milling and mixing: put the above-mentioned prepared raw materials into a nylon ball mill tank, add absolute ethanol as a dispersant according to 0.9 times the weight of the raw materials, and use zirconia balls as a ball milling medium, and use a planetary ball mill for ball milling. The ball milling speed is 350r / min, and adopts the combination of forward and reverse, the forward and reverse interval time is 30min, and the ball milling time is 6h;

[0034] 3) Drying: Put the slurry mixed by the ball mill in a clean enamel tray, and then put the tray in an electric constant tempe...

Embodiment 2

[0043] The preparation process of the varistor sheet for the zinc oxide arrester of this example comprises the following steps:

[0044] 1) Ingredients: prepared according to the mass percentage of raw materials, the specific formula is as follows: ZnO: 92%, Bi 2 o 3 : 3.0%, Co 3 o 4 : 0.2%, NiO: 0.4%, MnO: 0.3%, Sb 2 o 3 : 3.0%, SiO 2 : 0.3%, Er 2 o 3 : 0.2%, Ag 2 O: 0.6%.

[0045] 2) Ball milling and mixing: put the above-mentioned prepared raw materials into a nylon ball mill tank, add absolute ethanol as a dispersant according to 0.9 times the weight of the raw materials, and use zirconia balls as a ball milling medium, and use a planetary ball mill for ball milling. The ball milling speed is 350r / min, and adopts the combination of forward and reverse, the forward and reverse interval time is 30min, and the ball milling time is 8h;

[0046] 3) Drying: Put the slurry mixed by the ball mill in a clean enamel tray, and then put the tray in an electric constant tempe...

Embodiment 3

[0055] The preparation process of the varistor sheet for the zinc oxide arrester of this example comprises the following steps:

[0056] 1) Ingredients: prepared according to the mass percentage of raw materials, the specific formula is as follows: ZnO: 90%, Bi 2 o 3 : 2.0%, Co 3 o 4 : 0.15%, NiO: 0.7%, MnO: 0.65%, Sb 2 o 3 : 5.5%, SiO 2 : 0.2%, Er 2 o 3 : 0.3%, Ag 2 O: 0.5%.

[0057] 2) Ball milling and mixing: put the above-mentioned prepared raw materials into a nylon ball milling tank, add absolute ethanol as a dispersant according to 1.0 times the weight of the raw materials, and use zirconia balls as a ball milling medium, and use a planetary ball mill for ball milling. 400r / min, and adopts the combination of forward and reverse, the forward and reverse interval time is 30min, and the ball milling time is 6h;

[0058] 3) Drying: Put the slurry mixed by the ball mill in a clean enamel tray, and then put the tray in an electric constant temperature blast dryer to...

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Abstract

The invention provides a ZnO resistor disc. The resistor disc is prepared from, in percentage by mass, 85%-95% of ZnO, 0.5%-5% of Bi2O3, 0.05%-0.5% of Co3O4, 0.5%-2.0% of NiO, 0.1%-2.0% of MnO, 2.0%-8.0% of Sb2O3, 0.01%-1.0% of SiO2, 0.01%-1.0% of Er2O3 and 0.1%-2.0% of Ag2O. The provided resistor disc has the diameter larger than or equal to 115 mm, the varistor voltage gradient reaches 450 V/mmor above, the residual voltage ratio is smaller than or equal to 1.58, 2ms square wave withstanding current is larger than or equal to 2,000 A, 4/10 mu s large-current impact withstanding current is 100 kA, the ageing coefficient is smaller than or equal to 1.1, and the varistor voltage change rate is smaller than 6% after impact of 8/20 mu s impulse current with the peak value of 3,000 A. According to the technical scheme, the preparation process is simple, the technology economy is high, and existing manufacturing equipment of ZnO resistor discs for lightening arrestors can completely meet the industrial production demands.

Description

technical field [0001] The invention belongs to the technical field of arrester varistors, and in particular relates to a zinc oxide resistor and a preparation method thereof. Background technique [0002] Surge arrester is an important protective device to protect power equipment from internal and external overvoltage, and is an indispensable part of EHV and UHV power transmission and transformation equipment. Due to the limitation of space layout, the requirements for the operation reliability and miniaturization of surge arresters are getting higher and higher. As the core component of surge arresters, zinc oxide resistors have been the focus of research and development of surge arresters around the world since their inception because of their good nonlinear volt-ampere characteristics. With the rapid construction of ultra-high voltage and ultra-high voltage power grids, the demand for high-end zinc oxide arresters is increasingly urgent, and the power industry is paying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
CPCC04B35/453C04B35/622C04B2235/3298C04B2235/3277C04B2235/3262C04B2235/3294C04B2235/3418C04B2235/3224C04B2235/3291
Inventor 祝志祥陈新张强陈保安丁一朱承治张浩许衡谷山强王轲李庚陈川陈云刘昕孙亮
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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