共查询到20条相似文献,搜索用时 281 毫秒
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本文分析了农网配电变压器运行现状以及阻碍非晶合金配电变压器推广应用的因素,介绍了非晶合金配电变压器的生产技术水平和应用状况,从年运行费用、效率与负载系数等情况及投资回收期限、总拥有费用等方面对非晶合金配电变压器节能效果进行了理论计算,为用户合理选用非晶合金配电变压器提供了依据。并提出用户订购以及采用非晶合金配电变压器时应注意的几点问题,并且针对相关问题给出建议。 相似文献
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本文介绍了溶解氧(DO)以及总有机碳(TOC)对超大规模集成电路(ULSI)用水的污染,并列出了高纯水中TOC的浓度与栅氧化缺陷密度的关系数据.研究了影响水中DO的因素以及用各种方法降低TOC的比较,本文设计了用脱氧膜接触器,降低高纯水中的溶解氧.结合用双级反渗透(RO)及电脱盐(EDI) 再加上185nm紫外光照射高纯水,使高纯水中的溶解氧和TOC分别降至0.6μg/L和0.7μg/L,并用键能理论解释了185nm紫外降低TOC的机理. 相似文献
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深亚微米生产线中的超纯水装置 总被引:4,自引:0,他引:4
本文依据深亚微米技术的要求,结合实例,扼要介绍这种世界的超纯水装置。讨论了TOC/DO或WC/Si低于1PPb和用水点无微粒的技术以及费用等项热点问题。 相似文献
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IC工艺用超纯水系统的TOC实验研究 总被引:1,自引:0,他引:1
从运行管理角度,以实验方法考察了IC工艺用超纯水制造过程中TOC(总有机碳)的若干问题。通过在线测量一次纯水、二次纯水的TOC含量和相应的数据统计,评估了水平各异的两套超纯水制造系统中各主要装置对TOC的除去效率及其对TOC的影响。 相似文献
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本文研究了用185nm UV和254nm UV照射方法降低高纯水中的TOC和废水中五种有机物的TOC,用185nm UV能有效地将高纯水中的TOC降低到(≤0.3μg/L),满足超大规模集成电路用水的需要.同时研究了用两种不同的紫外线185nmUV和 254nmUV,对比照射降低水中难生物降解的有毒、有害的五种有机污染物(二苯甲酮、孔雀石绿、对氯苯酚(4-CP)、对硝基苯酚(4-NP)和罗丹明B(Rh B)的TOC,结果表明185nmUV,比254nmUV,降低有机物的TOC好得多.有利于环境保护. 相似文献
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基于功率流方法,本文提出了一种分析压电陶瓷变压器电气特性的方法.其主要贡献是:(1)给出了计算最佳负载、电压增益、效率和输出功率等电气特性的公式;(2)利用这些公式,给出了分析压电陶瓷变压器电气特性的计算程序,并提出了最佳电阻和最佳匹配网络的概念;(3)为了证明其理论结果,文中给出了仿真结果.本文所得到的结果为分析压电陶瓷变压器电气特性提供了一个有用的工具. 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》1999,20(2):317-324
A ridge waveguide transformer is commonly used in output structure for millimeter wave tubes(such as magnetron and traveling wave tube). It is not satisfied, if a traditional designing method is used in broadband case. The optimum design of a ridge waveguide transformer is given in this paper. The computation results show that the reflect character of the transformer can be met the demands for broad band match. 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》1998,19(4):697-703
For traditional design method of waveguide type impedance transformer, even noncontinuous susceptance produced by steps is considered, match character in wide frequency band are not satisfied commonly. In order to resolve this problem, an optimum design method is given in the paper. The computation shows that match character of the optimum designed multisection impedance transformer is better than traditional design method in MMW. 相似文献
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The squared-field-derivative method for calculating eddy-current (proximity-effect) losses in round-wire or litz-wire transformer and inductor windings is derived. The method is capable of analyzing losses due to two-dimensional and three-dimensional field effects in multiple windings with arbitrary waveforms in each winding. It uses a simple set of numerical magnetostatic field calculations, which require orders of magnitude less computation time than numerical eddy-current solutions, to derive a frequency-independent matrix describing the transformer or inductor. This is combined with a second, independently calculated matrix, based on derivatives of winding currents, to compute total AC loss. Experiments confirm the accuracy of the method 相似文献
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电压互感器、电流互感器和三相功率表结合使用,扩大了功率表的量限,并提出了公共变比的概念,解决了互感器变比不一致时三相功率的正确计量。 相似文献
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Georgilakis P.S. Doulamis N.D. Doulamis A.D. Hatziargyriou N.D. Kollias S.D. 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2001,31(1):16-34
The paper presents an effective method to reduce the iron losses of wound core distribution transformers based on a combined neural network/genetic algorithm approach. The originality of the work presented is that it tackles the iron loss reduction problem during the transformer production phase, while previous works concentrated on the design phase. More specifically, neural networks effectively use measurements taken at the first stages of core construction in order to predict the iron losses of the assembled transformers, while genetic algorithms are used to improve the grouping process of the individual cores by reducing iron losses of assembled transformers. The proposed method has been tested on a transformer manufacturing industry. The results demonstrate the feasibility and practicality of this approach. Significant reduction of transformer iron losses is observed in comparison to the current practice leading to important economic savings for the transformer manufacturer 相似文献
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实现变电站的无人值班有很多方式,其中一种行之有效的方式是运用"网络仪表",文中从无人值班技术的要求、内容、远动装置技术的发展以及怎样用网络仪表实现变电站无人值班作了详细的论述,并最终得出结论:使用网络仪表是实现变电站无人值班改造的最经济、适用的方法。 相似文献
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电力变压器是电力系统中最关键的设备之一,变压器的正常运行是对电力系统安全、可靠、优质、经济运行的重要保证,应用油色谱在线监测装置,使得电力变压器的持续不间断的油色谱分析得以实现,可早期预测设备内部存在的故障,为电力变压器的安全运行提供了很好的保障。 相似文献
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对于变电站而言,设备故障问题的出现不仅会对其正常运营产生影响,而且还可能引发火灾以及相应的经济损失.作为变电站中的主要设备之一,主变压器故障的发生频率相对较高. 相似文献