共查询到19条相似文献,搜索用时 78 毫秒
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介绍了三绕组变压器的二次侧绕组和三次侧绕组间负载在任意分配状态下的经济负载系数及绕组间的负载在经济分配状态下的最佳经济负载系数. 相似文献
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1 引言 电力变压器是一种应用极为广泛的电气设备。一般从发电机发出的电能送到用户,其间需经电力变压器少则4~5次,多则8~9次。而每经过一次变压器就要有一次损耗。在输配电系统中,线损(线路损失与变压器损失之和)一般约占供电能量的5%~9%,而其中变损占线损的20%~25%,在配电系统中,可占40%~50%,另外,在发电厂中还有厂用变压器损耗和输电变压器损耗,所以电力变压器的损耗在电力系统中占有很大的比重,因而,降低变损具有重大的意义。全面开展变压器经济运行,就可大大降低变压器的损耗,节约大量电能。判断一台变压器是否处于经济运行状态,通常以变压器经济负载率p_m来判断,当变压器的实际负载率a_(?)等于或接近艮_m时,变压器就处于经济运行状态,否则处于非经济运行状态。确定a_m的方法是否合理直接影响到变压器的容量选择得是否合理,变压器的运行效率是否在最高运行效率,所以,研究变压器的经济负载率有重大意义。 2 单台变压器经济负载率的习惯计算方法 变压器的负载率定义为: 相似文献
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本文依据负载与变压器经济运行的关系,分析了通过削峰填谷和提高负荷率的方式来降低运行中电网的有功功率消耗和无功功率消耗,实例应用证明了电网经济调度节电效果显著,可为供电企业创造一定的经济效益。 相似文献
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变压器经济运行在理论上大部分介绍的是介于单台或多台相同型号及容量的经济运行分析;而在生产实际中,因企业的发展或其它具体因素会造成多台不相同容量及型号的变压器并列运行时,生搬硬套“变压器负载率在40%~60%之间为最佳经济区”来指导生产运行就可能陷入误区。 相似文献
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讨论了一种变压器节能的运行方式,从而得出电价制度改革对变压器节能具有深远的意义。 相似文献
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煤泥用于坑口发电的经济效益分析 总被引:1,自引:0,他引:1
煤泥发电技术已经较为成熟,经济效益明显,分析了东庞矸石热电厂烧煤泥的经济性,得出了坑口热电厂利用煤泥发电既能降低发电成本又能减少环境污染结论。 相似文献
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由于BP神经网络存在一些缺点,本文采用RBF神经网络方法用于热电厂热负荷预测。预测结果表明:用本文的方法进行热负荷预测得到了十分满意的结果。 相似文献
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This article shows that the sudden end of economic expansion (movement, wealth) emerges as a natural, physical feature of the spreading movement, which has access to power (money), freedom to morph, and power storage (savings) for future movement on even greater areas. The movement is driven by power generation, which is interspaced with power savings on the same area. The theory is constructed systematically from the physical basis of economics concepts (money, savings, time, and bubbles) to a physics model that accounts for the time-dependent spreading of movement on an area. Previous study has shown that physics accounts for the proportionality between the annual wealth (GDP) of a population and the annual consumption of fuel to generate power for that population. The present theory extends this view to the more realistic situation where every movement in society (wealth and fuel consumption) is time dependent. 相似文献
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Assessment on energization sequence for reducing sympathetic interaction between wind turbine transformers 下载免费PDF全文
Increasing installations of large offshore wind farms are being designed and commissioned. The collection grids of these wind farms usually accommodate hundreds of wind turbine transformers. Energization of these transformers is likely to cause sympathetic inrush due to the close electrical distances between them. The wind turbine transformers are consequently subjected to long duration mechanical and thermal stresses under various energization conditions. In this paper, a network model of wind farm collection grid, developed and validated against field measurement results, is utilized to assess various energization sequences for reducing the sympathetic inrush. Deterministic assessment under a critical energization condition and stochastic assessment under stochastic energization condition were conducted. Both indicate that the optimum sequence is to energize wind turbine transformer from the one closest to the offshore platform to the one farthest from the platform. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献