Method and device for optimizing electrical properties of ZnO varistor

By performing electrothermal coupling treatment on ZnO resistor sheets and optimizing them based on breakdown field strength and leakage current density, the problem of insufficient electrical parameters in the prior art is solved, and the electrical performance of the resistor sheets is improved.

CN116611382BActive Publication Date: 2026-07-24CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD
Filing Date
2023-04-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies have shortcomings in improving the breakdown field strength and leakage current density of ZnO resistive sheets, and there is considerable room for improvement in electrical parameters.

Method used

By performing electrothermal coupling treatment on the ZnO resistor sheet successively until the current or power consumption no longer gradually increases, and using the breakdown field strength and leakage current density as criteria, the conditions for electrothermal coupling treatment are optimized until the preset time is met, thus obtaining the optimized ZnO resistor sheet.

Benefits of technology

This significantly improves the breakdown field strength of the ZnO resistor and reduces the leakage current density, thereby enhancing its electrical performance.

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Abstract

A method and device for optimizing electrical performance of ZnO varistor, the method comprising: measuring the volt-ampere characteristic curve of the ZnO varistor to obtain the untreated breakdown field strength E B(0) and the untreated leakage current density J L(0) ; sequentially performing electro-thermal coupling treatment on the ZnO varistor until the current or power consumption in the ZnO varistor no longer gradually increases, and performing the last electro-thermal coupling treatment on the ZnO varistor for a preset duration; measuring the volt-ampere characteristic curve of the ZnO varistor after the electro-thermal coupling treatment to obtain the treated breakdown field strength E B(n) and the treated leakage current density J L(n) ; if E B(n) is greater than E B(n‑1) , and J L(n) is less than J L(n‑1) , then performing the electro-thermal coupling treatment again for a preset duration according to the condition of the last electro-thermal coupling treatment until E B(n) is no longer greater than E B(n‑1) , and J L(n) is no longer less than J L(n‑1) , thereby obtaining the optimized ZnO varistor. The method and device provided by the embodiment of the present application greatly improve the electrical parameters of the varistor.
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