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不同因素影响下的油纸绝缘直流击穿特征 被引量:5
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作者 张书琦 赵晓林 +5 位作者 谭瑞娟 梁宁川 周秀 刘力卿 齐波 李成榕 《高压电器》 CAS CSCD 北大核心 2020年第4期102-107,共6页
由于系统性原因,换流变压器阀侧在实际运行过程中长期承受直流电场分量作用,油纸绝缘在直流电压下的耐受能力是换流变压器设计过程中的重要关注点。文中考虑谐波含量、油温、含气量、油纸介电常数、纸板浸渍程度等各种潜在因素,开展了... 由于系统性原因,换流变压器阀侧在实际运行过程中长期承受直流电场分量作用,油纸绝缘在直流电压下的耐受能力是换流变压器设计过程中的重要关注点。文中考虑谐波含量、油温、含气量、油纸介电常数、纸板浸渍程度等各种潜在因素,开展了油纸绝缘直流击穿特征的基础试验研究,并用初始电子发射、空间电荷、杂质小桥等电介质理论对结果予以合理阐释,相关结论可对换流变压器阀侧绝缘结构优化和场强设计提供一定的参考。 展开更多
关键词 油纸绝缘 击穿特征 直流电压 谐波分量 温度 含气量 介电常数 浸渍程度
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基于AlN钝化层的异面GaAs光电导开关初步研究
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作者 杨光晖 杨迎香 +2 位作者 程骏 吴小帅 胡龙 《通讯世界》 2024年第2期196-198,共3页
为解决GaAs光电导开关(PCSS)电极接触区局部高电场和热累积效应的问题。引入高热导率、高临界击穿电场强度及热稳定性优的AlN薄膜钝化GaAs PCSS,探索了AlN薄膜的制备工艺,分析了其元素成分、折射率及特征击穿电场强度(Eb)。同时制备了Al... 为解决GaAs光电导开关(PCSS)电极接触区局部高电场和热累积效应的问题。引入高热导率、高临界击穿电场强度及热稳定性优的AlN薄膜钝化GaAs PCSS,探索了AlN薄膜的制备工艺,分析了其元素成分、折射率及特征击穿电场强度(Eb)。同时制备了AlN-GaAs PCSS,分析了不同偏置电压下PCSS的瞬态特性,探究了GaAs PCSS的损伤机制。结果表明,溅射功率为40 W、Ar:N2比为24:2、压强为0.8 Pa时,AlN薄膜的质量最优;在905 nm、2μJ、50 kV/cm下,AlN-GaAs PCSS输出幅值为9.6 kV、上升时间为450 ps、脉冲宽度为2.3 ns,初步验证AlN薄膜的引入在提升GaAs PCSS可靠性方面具有可行性。 展开更多
关键词 GaAs PCSS ALN薄膜 钝化 瞬态特性 特征击穿电场强度
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Release characteristic of different classes of sodium during combustion of Zhun-Dong coal investigated by laser-induced breakdown spectroscopy 被引量:9
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作者 Yong He Kunzan Qiu +5 位作者 Ronald Whiddon Zhihua Wang Yanqun Zhu Yingzu Liu Zhongshan Li Kefa Cen 《Science Bulletin》 SCIE EI CAS CSCD 2015年第22期1927-1934,共8页
Serious fouling and slagging problems are associated with the combustion of Chinese Zhun-Dong coal due to its high content of sodium (Na). Understanding the release characteristic of Na during the combustion is esse... Serious fouling and slagging problems are associated with the combustion of Chinese Zhun-Dong coal due to its high content of sodium (Na). Understanding the release characteristic of Na during the combustion is essential to viable utilization of this coal. In this work, coal samples were treated with a sequence of solvents: water (H2O), ammonium acetate (NH4Ac), hydrochloric acid (HC1), and the release characteristics of various classes of Na during coal combustion were investigated using the technique of laser-induced breakdown spectroscopy. The relative contribution of various Na classes to the Na release during each combustion stage was found to be similar, in the order of H2O-soluble Na 〉 NHaAcsoluble Na 〉 HCl-soluble Na 〉 insoluble Na. Sodium released during the devolatilization stage can be attributed to each of the sodium classes. After the devolatilization stage, H2O-soluble Na and NHaAc-soluble Na dominated the Na release during both char and ash stages. Over 64 % of the total Na released during combustion comes from the H2O-soluble Na, which suggests that the Na release during the combustion of Zhun-Dong coal can be reduced effectively after treatment by H2O washing. 展开更多
关键词 Zhun-Dong coal Laser-inducedbreakdown spectroscopy (LIBS) - Sodium releaseCombustion Online measurement
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