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一、概述 五强溪水电站共有500kV/3000MVA三相双圈强迫油循环水冷却升压变压器5台,5台主变均由沈阳变压器厂制造生产,其额定电压500kV,额定容量300MVA,额定频率50HZ,布置在66.80m高程与各机组段相对应的主变室内。主变压器高压侧电压500± 相似文献
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我站现装机3×800千瓦。用电缆接至6.3KV母线桥,再经三根长度大于60米的电缆引至升压站,由两台1800KVA变压器、一台750KVA变压器(中性点均没有接地)经35KV和10KV两回出线向外供电。厂用 相似文献
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据调查我国已建的中小型水电站中,单机容量为20MW及以下多采用扩大单元结线,额定电压为10KV、6.3KV,厂用变压器容量为180~320KVA,厂用分支短路容量约为300~400MVA,用已生产的RN1—10/2×20型熔断器作变压器高压侧保护,不仅额定电流满足要求,切断容量也能配合,简化布置,节省了投资。 相似文献
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近几年来开化县小水电装机规模不断扩大,目前该县拥有并网水电站45座,装机台数91台,容量26552kw.其中低压水轮发电机组86台,占总数的945%,容量13422kw.随着低压水轮发电机组单机容量及电站规模的不断增大,在发电机三相负荷电流平衡的情况下,中性线电流偏大的问题日益突出,给发电机、变压器的运行带来了不利影响,造成发电机、变压器损耗增加,温升提高,中性线过度发热等危害.1调查田试为分析低压水轮发电机中性线不正常电流产生的原因及危害,对一些电站进行了调查测试.东坑水库一级电站装机2X200kw,主变1台容量为630kVA,… 相似文献
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油的介质损耗试验是新变压器投运之前必须要作的一项试验,铜街子电站4台主变压器投运后相继出现油介担偏大或超标现象。笔者对铜街子电站主变油介损超标情况进行了多方面的分析。在尝试了多种净油方式.连续跟踪变压器油化验数据7年之后,终于找到了导致铜街子电站主交油介损超标的真正原因:油中有金属微粒。该结论有助于我们将来在遇到类似问题时采取正确的方法进行处理。 相似文献
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本文针对白石水库工程索赔问题,参照国际通用的FIDIEC条款,详细阐述了工程索赔过程中索赔事件发生的原因、审核的依据、索赔过程及索赔控制手段等问题。 相似文献
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AbstractThis article offers a framework for understanding how energy is used to meet water demand in countries. Specifically, the relationships between energy use and water scarcity, the location of renewable water resources, and aggregate water demand are explored. The article also examines how policy options such as water price reforms, agriculture subsidies and crop elimination may influence the energy use and energy intensity of water withdrawals. Conclusions suggest that while policy options exist, certain uncontrollable factors such as severe water scarcity or substantial freshwater abundance limit the ability of some countries to significantly improve the aggregate energy efficiency of water provision. 相似文献
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本文对已建关河水库引水发电洞结构进行了复核计算。在计算结果的基础上,对引水发电洞出现的问题进行分析。分析认为,关河水库引水发电洞的承栽能力满足要求。但限裂不满足。 相似文献
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Field experiments are in progress for secondary wastewater upgrading for unrestricted utilization for agricultural irrigation. The integrative approach of secondary effluent polishing is based on using a hybrid UltraFiltration (UF) and Reverse Osmosis (RO) membrane pilot system with a capacity of around 1 m3/hr. The UF effluent is used to feed the RO membranes. The RO permeate is subsequently applied for vegetable irrigation. Field results indicate the importance of the UF component in the removal of the organic matter and the pathogens that are still contained in the secondary effluent. Under specific conditions, when the dissolved solids content is relatively low, regarding sanitary and health aspects, the UF effluent can be applied for unrestricted irrigation. During the RO stage most nutrients are removed, allowing application of the effluent without jeopardizing the soil fertility and the aquifers. Preliminary economic assessment indicates that the extra cost for effluent polishing via the UF stage only is in the range of 5 to 15 US cents/m3. The extra cost for the RO stage is also assessed at 10 to 25 US cents/m3. The additional cost depends to a large extent on the quality of the incoming raw secondary effluent and local requirements of the command region. 相似文献
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通过综合考虑技术经济指标,并针对阿珠水电站所在河流三岔河含沙量大的特点,从5种机型中优选出适合阿珠水电站具体情况的ZZA315机型作为首选机组。 相似文献
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简述了王家圆水库除险加固工程泄洪洞的地质条件、工程布置及衬砌形式。并对隧洞的种砌进行了验算,该村砌形式满足规范要求;隧洞进口部分的围岩稳定性较差,具体衬砌形式待围岩开挖后视现场实际情况决定。 相似文献
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Water grids are emerging as a response to water scarcity in many urban areas. These grids are comprised not only of traditional surface and groundwater supplies, but also alternative, climate-independent water sources such as desalination and wastewater recycling, as well as one and two-way pipelines connecting surface-water supplies in different regions. The complexity and heterogeneity of these water supply networks brings new challenges to water management. Water managers need to determine strategies to operate the system in terms of multiple objectives, subject to uncertainty and boundary conditions relating to climate, demand and infrastructure. This paper outlines a framework of methodologies for developing optimal operating plans for short-term planning for water grids, in terms of the objectives of interest. 相似文献
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厚积薄发求发展 碧水长流永泽民-写在长江水资源保护科研所成立30年之际 总被引:1,自引:1,他引:0
长江水资源保护科学研究所 《人民长江》2008,39(23)
长江水资源保护科学研究所成立于1978年。30余年来,长江水资源保护科学研究所开展了大量的科学研究工作,为长江流域的水资源保护工作提供了强有力的技术支持,在环境影响评价、水功能区划分、水资源论证、入河排污口论证等方面开展了大量开创性工作。在国家一些重大工程中承担并完成了环境影响评价工作,如三峡工程、南水北调工程等。近年来,长江水资源保护科学研究所还承担并完成了大量国家"863"、"973"、"948"、"十一五"科学发展支撑项目,以及水利部现代水利科技创新等重点项目。在对多年来所开展的重大科研项目和应用成果进行总结的同时展望未来环境保护科研事业的发展方向和前景。 相似文献