Production process of zinc oxide resistance chip with high electric potential gradient and strong through-current capability

Abstract

The invention discloses a production process of a zinc oxide resistance chip with high electric potential gradient and strong through-current capability. The zinc oxide resistance chip comprises the following raw materials: a main ingredient zinc oxide and a dopant, wherein the dopant comprises bismuth sesquioxide, cobalt sesquioxide, nickel sesquioxide, chromium sesquioxide, stibium sesquioxide, silica, yttrium sesquioxide and zirconia; the mass percent of zinc oxide is not less than 90%. The production process comprises the following steps: (1) ball-milling mixing; (2) drying granulation; (3) dry pressing; (4) sintering; and (5) silver electrode coating. By virtue of the production process, the zinc oxide resistance chip with high electric potential gradient and strong through-current capability can be prepared based on a solid-phase synthesis method.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical sensitive ceramic materials, and in particular relates to a production process of a zinc oxide resistance sheet with high potential gradient and strong flow capacity. Background technique [0002] The zinc oxide resistor is the core component of the metal oxide arrester for power grid operation protection equipment. When encountering a lightning overvoltage or operating overvoltage attack that is many times higher than the normal voltage, the resistance value of the zinc oxide resistor will instantaneously change from high resistance to high resistance. Low resistance, so that a strong instantaneous overcurrent flows into the earth through the zinc oxide resistor, thus avoiding the electrical equipment being attacked by overvoltage and affecting the safe operation of the power grid. Up to now, metal oxide arresters connected in series and parallel with insulators have been It is co...

AI Technical Summary

Problems solved by technology

[0003] In recent years, as UHV transmission technology has become and will continue to become the main direction of development of my country's power grid, the power grid has put forward the requirements for the life and lightning protection effect (determined by potential gradient and flow capacity) of metal oxide arresters used in UHV transmission lines. higher requirements, and the zinc oxide resistor is the core component of the metal zinc oxide arrester, and its performance and electrical parameters directly affect the operating life and lightning protection effect of the arrester; and in the past, zinc oxide with high potential gradient and strong flow capacity The demand for resistors mainly depends on foreign imports, and there is no production process with independent intellectual property rights

With the development of UHV transmission lines in my country in recent years, the demand for zinc oxide resistors with high potential gradient and strong flow capacity has further increased, and the requirements for its electrical performance and production technology have also become higher and higher, resulting in the use of traditional ordinary Zinc oxide resistors or the status quo of still using imported foreign products cannot meet the growing demand for UHV transmission line construction

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