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High-gradient and high-capacity zinc oxide voltage dependent resistor disc and fabrication method thereof

A varistor and zinc oxide technology, which is applied in varistors, resistance manufacturing, overvoltage protection resistors, etc., can solve the problem of reduced electrical performance, consistency, difficulty in controlling stability, and reduced aging performance of zinc oxide resistors And other problems, to achieve the effect of good fluidity, avoid secondary pollution, smooth appearance

Active Publication Date: 2013-04-03
NANYANG ZHONGXIANG POWER ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can achieve the purpose of reducing the grain size to varying degrees, but at the same time lead to the reduction of the electrical properties of the zinc oxide resistor, especially the reduction of the 2ms square wave flow and aging performance; The process requirements are very strict and complex, and it is difficult to control the consistency and stability in mass production; the electrical parameters are good and bad, such as a certain parameter is good, but other several are degraded and reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A high-gradient and large-capacity zinc oxide varistor sheet is composed of the following raw materials in mass percentage: 70% zinc oxide, 8% bismuth trioxide, 4% tricobalt tetroxide, 3% dicobalt trioxide, three 4% antimony oxide, 3.1% manganese dioxide, 2% nickel oxide, 3% silicon dioxide, 2% boron oxide, 0.04% aluminum nitrate, 0.06% glass powder, 0.5% rare earth, 0.3% praseodymium oxide. The average grain size of the zinc oxide varistor sheet produced is 71 μm, and the potential gradient is 650V / mm.

Embodiment 2

[0021] Example 2: A high-gradient and large-capacity zinc oxide varistor sheet is composed of the following raw materials in mass percentage: 95% zinc oxide, 1% bismuth trioxide, 0.3% tricobalt tetroxide, 0.2% dicobalt trioxide, three Antimony oxide 1%, manganese dioxide 0.1%, nickelous oxide 0.12%, silicon dioxide 2%, boron oxide 0.1%, aluminum nitrate 0.01%, glass powder 0.01%, rare earth 0.1%, praseodymium oxide 0.06%. The average grain size of the manufactured zinc oxide varistor sheet is 60 μm, and the potential gradient is 628V / mm.

no. 3 example

[0022] The third embodiment: a high-gradient and large-capacity zinc oxide varistor, composed of the following raw materials in mass percentage: 80% zinc oxide, 4% bismuth trioxide, 1.1% tricobalt tetroxide, 3% dicobalt trioxide, Antimony trioxide 3%, manganese dioxide 2%, nickelous oxide 1.4%, silicon dioxide 3%, boron oxide 1.6%, aluminum nitrate 0.05%, glass powder 0.05%, rare earth 0.5%, praseodymium oxide 0.3% . The average grain size of the manufactured zinc oxide varistor sheet is 82 μm, and the potential gradient is 590V / mm.

[0023] A method for preparing a high-gradient large-capacity zinc oxide varistor sheet, which is operated according to the following steps:

[0024] . Weighing: Weighing according to the predetermined formula weight;

[0025] .Ball milling: After mixing bismuth trioxide, tricobalt tetroxide, dicobalt trioxide, antimony trioxide, manganese dioxide, nickelous oxide, silicon dioxide, boron oxide, glass powder, rare earth and praseodymium oxide...

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PUM

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Abstract

The invention discloses a high-gradient and high-capacity zinc oxide voltage dependent resistor disc and a fabrication method thereof. The resistor disc comprises zinc oxide, bismuth trioxide, cobaltosic oxide, cobaltic oxide and antimonous oxide. The fabrication method of the resistor disc comprises the steps of ball milling, pelleting, glue discharging, prefiring and coating, firing, grinding, heat treatment, electrode spraying, glazing and the like. The potential gradient of the prepared zinc oxide voltage dependent resistor disc is raised greatly, the 2ms square wave through-flow capacity remains constant compared with the ordinary resistor disc having the same specification, and the fabrication method reduces procedures, saves energy, and avoids secondary pollution of accessory additives.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical sensitive ceramic materials, and in particular relates to a high-gradient and large-capacity zinc oxide resistance sheet and a preparation method thereof. Background technique [0002] Zinc oxide resistors are the core components of surge arresters for power grid operation protection equipment. At present, the potential gradient of existing zinc oxide resistors is relatively low, generally ranging from 190 to 220V / mm. As the voltage of the protective equipment increases, the number of superimposed zinc oxide resistors used in the arrester will increase, the volume and weight will increase, and the height cannot be reduced, which cannot meet the requirements of equipment miniaturization; especially with the development of power system GIS Widely used, it is imminent to require the miniaturization of the matching tank arrester. Therefore, the potential gradient of the existing zinc...

Claims

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Application Information

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IPC IPC(8): H01C7/12H01C17/30
Inventor 徐建韦国松陈成刚刘斌王春虎李庆伟谢宝超李江
Owner NANYANG ZHONGXIANG POWER ELECTRONICS
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