Recipe and preparation method of high-voltage gradient zinc oxide resistance card

Abstract

The invention discloses a recipe and a preparation method of a high-voltage gradient zinc oxide resistance card. The recipe of the zinc oxide resistance card of the invention reasonably and preferably adopts the ingredients and the contents of the zinc oxide resistance card, the zinc oxide resistance card prepared by the recipe has the high-voltage gradient as high as 350 to 600v / mm, and at the same time, under the high-voltage gradient, the zinc oxide resistance card can maintain good nonlinear characteristic, electrical property and ageing-resistant characteristic to meet the miniaturization requirement of electronic components such as lightning protectors in practical application. In the preparation method of the zinc oxide resistance card of the invention, the accessory ingredients and trace ingredients in the zinc oxide resistance card have fine granularity, are matched, and are uniformly mixed, the impurity mixing quantity is reduced, at the same time, because the low-temperature heat-insulation process is added in the sintering process, the zinc oxide resistance card forms a stable crystal boundary structure which is favorable for improving the stability of the zinc oxide resistance card and the phase change of the bismuth oxide in the secondary heat treatment process, so the electrical property of the zinc oxide bismuth oxide can be improved.

Description

technical field [0001] The invention relates to the field of resistance materials for lightning arresters, in particular to a formula and a preparation method of a high-voltage gradient zinc oxide resistance sheet. Background technique [0002] Zinc oxide resistors have very superior nonlinear characteristics, and are widely used in power systems as the core components of lightning arresters to protect electrical equipment from overvoltage damage such as lightning. [0003] In recent years, with the development of the economy, the requirements for the transmission capacitance and voltage in the power system have been continuously improved. New requirements were put forward. At present, the miniaturization of power transmission and transformation equipment has become a major problem that needs to be solved urgently. [0004] The voltage gradient of existing zinc oxide resistors is low, generally 180-220V / mm. When zinc oxide resistors are used in transmission lines with high...

AI Technical Summary

Problems solved by technology

At present, although these methods achieve the purpose of reducing the grain size and increasing the voltage gradient of the resistor, on the other hand, they lead to the nonlinear performance of the resistor and the reduction of electrical performance (such as 4 / 10μs large current flow capacity and 2ms Reduced square wave flow capacity, etc.)

Japanese Patent Application No. 49-064897 and Japanese Patent Application No. 53-044900 use the addition of a large amount of SiO 2 way to increase the voltage gradient, however, a large amount of SiO 2 Adding too much Zn 2 SiO 4 Second phase, causing other electrical properties to decrease, such as increased leakage, etc. as described in Acta Synthetic Crystals, Vol.

Chinese patent application number CN95102922.3 discloses a method for manufacturing voltage non-linear resistors, in which two heat treatments are used to overcome the above-mentioned shortcomings and obtain high voltage gradient resistors. However, the method is complicated , two heat treatments require a lot of energy

However, in the existing primary heat treatment method, if the temperature is lower then Bi 2 o 3 Phase change is difficult to occur, and high temperature will lead to deterioration of resistor performance, such as increased leakage current, decreased nonlinear coefficient, etc.

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