Development and Application of the High-Gradient Zinc Oxide Varistor

中国防雷 Pub Date : 2021-09-20 DOI:10.1109/ICLPandSIPDA54065.2021.9627350

Wei Cao, Zihao Liu, Xiu-min Chen, S. Gu, Shuai Wan, Y. Zhu

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引用次数: 1

Abstract

In order to further reduce the volume of the GIS arrester and improve its performance, this article carried out the experimental analysis on the doping formula and process of high-gradient high-performance zinc oxide varistors. The influence of crucial additives on the overall performance of the varistor is obtained. Crucial processes such as debinding of the unburnt body and heat treatment of the side insulation layer are optimized. Based on the analysis, this paper completed samples of ZnO varistors with four specifications of D62, D71, D115, and D128. The D115 varistor has been applied to the 500 kV GIS arrester prototype with the miniaturized structure design and potential distribution optimization. The test results show that the potential gradient of the varistors studied in this paper is close to 400 V/mm. Varistors possess a series of excellent properties such as voltage ratio as low as 1.55 at a nominal discharge current and a current capacity up to 300 J/mm3. The 500 kV GIS arrester developed based on this varistor has a 10% reduction in residual voltage than the GB/T 11032 standard, a 15% reduction in volume compared to the traditional ones, and superior overall performance.

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高梯度氧化锌压敏电阻的研制与应用

为了进一步减小GIS避雷器的体积，提高其性能，本文对高梯度高性能氧化锌压敏电阻的掺杂配方和工艺进行了实验分析。得到了关键添加剂对压敏电阻整体性能的影响。对未烧体的脱脂和侧保温层的热处理等关键工艺进行了优化。在此基础上，本文完成了D62、D71、D115、D128四种规格的ZnO压敏电阻样品。通过微型化结构设计和电势分布优化，将D115型压敏电阻应用于500kv GIS避雷器样机中。测试结果表明，本文所研究的压敏电阻的电位梯度接近400 V/mm。压敏电阻具有一系列优异的性能，如在标称放电电流下电压比低至1.55，电流容量高达300 J/mm3。基于该压敏电阻研制的500kv GIS避雷器，其残余电压比GB/T 11032标准降低10%，体积比传统避雷器减小15%，综合性能优越。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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中国防雷

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