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Medium voltage varistor and preparation method thereof

A varistor and resistance technology, applied in the field of medium voltage varistor and its preparation, can solve the problems of increased difficulty, high height, volume and weight, inconvenient transportation and installation, etc., and achieve the effect of high voltage gradient and good stability

Inactive Publication Date: 2019-01-25
惠州嘉科实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The voltage gradient of existing zinc oxide resistors is low, generally 180-220V / mm. When zinc oxide resistors are used in transmission lines with higher voltage levels, multiple resistor valves need to be superimposed, resulting in the height, volume and The weight is very large, which brings a lot of inconvenience to transportation and installation
For example, the lightning arrester used for transmission lines has a large height, volume and weight due to the low voltage gradient of zinc oxide resistance, which greatly increases the difficulty of transportation and installation.
At the same time, the existing zinc oxide resistance is not stable, so it has a greater safety hazard in the application process

Method used

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  • Medium voltage varistor and preparation method thereof
  • Medium voltage varistor and preparation method thereof
  • Medium voltage varistor and preparation method thereof

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preparation example Construction

[0052] see figure 1 , the preparation method of the medium-voltage varistor of an embodiment, comprises the following steps:

[0053] S110, ZnO, Co 2 o 3 、 Bi 2 o 3 , SbO, Ni 2 o 3 and MnCO 3 Mix, and carry out wet ball milling operation, obtain ball milling slurry; Wherein, ZnO, Co 2 o 3 、 Bi 2 o 3 , SbO, Ni 2 o 3 and MnCO 3 The mass ratio is (93~98):(0.4~5):(0.5~4):(18~30):(0.05~1):(0.3~0.8).

[0054] It should be noted that by combining ZnO, Co 2 o 3 、 Bi 2 o 3 , SbO, Ni 2 o 3 and MnCO 3 Mix according to the above ratio, and then use wet ball milling to obtain ball milled slurry. Specifically, ZnO, Co 2 o 3 、 Bi 2 o 3 , SbO, Ni 2 o 3 and MnCO 3 Place them in a grinding container according to the above ratio for mixing operation, and then use a wet ball mill to perform wet ball milling operation on the mixed materials in the grinding container. The wet ball mill adopts a special rolling bearing as the support structure of the cylinder. The mixed ...

Embodiment 1

[0081] 970gZnO, 50gCo 2 o 3 、40gBi 2 o 3 , 300gSbO, 10gNi 2 o 3 and 3gMnCO 3 Mixing, and performing a wet ball milling operation, the duration of the wet ball milling operation is 2 hours, thereby obtaining a ball milling slurry;

[0082] After drying the obtained ball mill slurry, adding a binder for mixing and granulation operation, the binder is polyvinyl alcohol, so as to obtain mixed granules;

[0083] Carrying out a dry pressing operation on the obtained mixed granules to obtain a dry compressed tablet;

[0084] Under the temperature condition of 750°C, pre-sinter the obtained dry compacted body for 2 hours. After the sintering operation, a sintered sheet is obtained;

[0085] Coating silver paste layers on opposite sides of the obtained sintered sheet respectively, and performing a heat treatment operation, so that electrodes are obtained on the sintered sheet;

[0086] The aging operation is carried out on the sintered sheet after the electrode is obtained, so...

Embodiment 2

[0089] 960gZnO, 40gCo 2 o 3 、30gBi 2 o 3 , 270gSbO, 5gNi 2 o 3 and 3.5gMnCO 3 Mixing, and performing a wet ball milling operation, the duration of the wet ball milling operation is 2 hours, thereby obtaining a ball milling slurry;

[0090] After drying the obtained ball mill slurry, adding a binder for mixing and granulation operation, the binder is polyvinyl alcohol, so as to obtain mixed granules;

[0091] Carrying out a dry pressing operation on the obtained mixed granules to obtain a dry compressed tablet;

[0092]Under the temperature condition of 750°C, pre-sinter the obtained dry compacted body for 2 hours. After the sintering operation, a sintered sheet is obtained;

[0093] Coating silver paste layers on opposite sides of the obtained sintered sheet respectively, and performing a heat treatment operation, so that electrodes are obtained on the sintered sheet;

[0094] The aging operation is carried out on the sintered sheet after the electrode is obtained, so...

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Abstract

A medium voltage varistor comprises the following components by mass: 93-98 parts of ZnO, 0.4-5 parts of Co2O3, 0.5-4 parts of Bi2O3, 18-30 parts of SbO, 0.05-1 part of Ni2O3 and 0.3-0.8 part of MnCO3. The components of the medium voltage varistor are subjected to mixing operation, wet ball milling operation, mixing granulation operation, dry pressing operation, pre-sintering operation, post-sintering operation, silver layer coating operation, heat treatment operation and curing operation to obtain the medium voltage varistor. According to experimental test results, the voltage gradient of themedium voltage varistor is 220-280 (V / mm), so that the varistor has the advantages of good stability and high voltage gradient.

Description

technical field [0001] The invention relates to a varistor, in particular to a medium-voltage varistor and a preparation method thereof. Background technique [0002] The varistor is a voltage limiting type of protection period. Utilizing the nonlinear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, never realizing the protection of the subsequent circuit. In recent years, with the rapid development of information technology, the miniaturization, multi-function, and high stability of electronic equipment are called the inevitable trend of development, and the varistor as a protective semiconductor element is also correspondingly moving toward thinner, lower voltage, and higher development in the direction of reliability. [0003] The voltage gradient of existing zinc oxide resistors is low, generally 180-220V / mm. When zinc oxide resistors are used in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
CPCC04B35/453C04B35/622C04B2235/3262C04B2235/3275C04B2235/3279C04B2235/3294C04B2235/3298
Inventor 张少钰
Owner 惠州嘉科实业有限公司
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