溪洛渡水电站机组紧急停机回路的设计简介

针对溪洛渡水电站厂区范围广、装机容量大、系统地位重要等特点,对机组事故状态下的紧急停机和关闭快速门回路提出了极高的要求。结合电站的枢纽布置和计算机监控系统配置情况,重点介绍了机组在事故情况下的紧急停机回路的设计方案。     

溪洛渡水电站年度岁修首台机组A修完成

<正>5月25日,溪洛渡水电站7号机组完成所有A修项目,成功并网。这标志着溪洛渡水电站本年度岁修首台机组A修圆满完成。溪洛渡水电站7号机组A修于2018年10月25日开工,历时211d,完成了修前试验、定子铁芯及线棒更换、常规A级检修、回装试验、机组启动试验等工作。溪洛渡水电站7号机组的并网发电,标志着电站本年度机组岁修接近尾声,电     

溪洛渡水电站装机容量净增126万kW

8月28日，中国三峡总公司在北京为金沙江溪洛渡水电站、向家坝水电站成功招标了26台国产水轮发电机组。其中：溪洛渡电站18台机组单机容量为77万kW，向家坝电站8台机组单机容量为80万kW。此举表明，溪洛渡水电站的装机容量已由先前的1260万kW扩容到1386万kW，净增了126万kW。     

世界最大的塑料推力瓦水轮机组正式投产发电

三峡集团4月1日发布消息称,溪洛渡左岸电站3号机组于近日结束72小时试运行并完成停机检修,正式投产发电。至此,溪洛渡电站已有14台机组投产发电。     

溪洛渡水电站励磁系统灭磁逻辑和时序分析

针对溪洛渡水电站励磁系统灭磁回路的主要设备,对其逻辑及时序进行了简要分析.现场试验表明,灭磁设备动作逻辑及时序正确.溪洛渡水电站励磁系统采用双磁场断路器冗余配置,设计合理,完全满足溪洛渡水电站励磁系统的灭磁需要.     

溪洛渡水电站已有14台机组投产发电

溪洛渡左岸电站3号机组于3月30日结束72 h试运行并完成停机检修,正式投产发电。至此,溪洛渡电站已有14台机组投产发电。     

溪洛渡水电站2016年首次满发

8月8日上午8时15分,溪洛渡水电站机组总出力达到1250万千瓦,实现2016年首次满发。当前,金沙江进入主汛期,溪洛渡电站正值发电黄金期。作为溪洛渡水电站的运行管理单位,溪洛渡电厂积极落实各项措施,加强对外沟通协调,持续关注实时雨情、水情,增加巡检频次,强化在线监测及趋势分析,严守值班纪律,全力以赴保障机组长周期、满负荷、不间断运行,以对党和国家、对人民的高度责任感,争取实现溪洛渡水电站防洪、发电双丰收,为三峡集团提质增效做出更大贡献。     

我国第二大水电站溪洛渡电站即将开工

我国第二大水电站溪洛渡电站工程即将正式开工,这将是“十五”期间开工的最后一项巨型水电工程,标志着金沙江水电梯级开发即将拉开序幕。据长江三峡工程开发总公司介绍,经过近三年的前期准备,溪洛渡电站的技术方案、环保、水保、土地预审以及施工区移民搬迁安置等前期工作已经完成,也实现了水、电、路和土地的“三通一平”,已经具备开工条件。据悉,溪洛渡电站预计2007年11月截流;2012年6月第一台机组安装完成;2013年6月水库蓄水至高程540 m,首批机组发电;2015年竣工。据了解,溪洛渡工程配套的长江合江至雷波段珍稀鱼类国家自然保护区调整方…     

溪洛渡、向家坝电站最后一批机组通过验收

<正>8月12日,溪洛渡、向家坝电站机组启动验收委员会召开的会议认为:溪洛渡18号和1号机组、向家坝4号机组已满足新投产机组设备验收条件,至此,两电站最后一批机组通过验收。三峡集团党组成员、副总经理张诚主持会议。张诚指出,溪洛渡、向家坝水电站全部机组通过启动验收,达到精品机组要求且高于国际同类机型标准,这是设计单位、施工单位、国家电网、南方电网、水利部质监站以及集团公司工程建设部、机电工程局、长江电力、三峡发展、设备公司等建     

溪洛渡水电站左岸进水口拦污栅牛腿 施工改进工艺

1 工程简介 溪洛渡水电站位于四川省雷波县和云南省永善县境内金沙江干流上,是金沙江下游梯级开发的第二级水电站,是一座以发电为主,兼有防洪、拦沙和改善下游航运条件等巨大综合效益的工程.溪洛渡水电站装机容量1 260万kW,位居世界第三.溪洛渡电站计划2013年6月水库蓄水至540 m高程,首批机组发电,2015年工程竣工. 左岸地下厂房共布置9台机组,采用单机单管供水,电站进水口采用露天竖井式结构,进水方向依次布置拦污栅、喇叭口、闸门竖井、压力管道.拦污栅采用叠梁门分层取水,实现对生态的保护,拦污栅顶部分别设置栅槽、门槽、储门槽、及门机轨道等主要结构部件.进水口拦污栅底板高程518 m,顶部高程610 m;拦污栅桩号0+3.46 ～0 +33.20.     

地下厂房施工过程的三维非线性数值模拟分析

根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。     

Evaluation of freshwater mussel relocation as a conservation and management strategy

The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects.     

基于模型试验的河床砂砾石层基本特性研究

为了经济可靠地确定深厚覆盖层的基本特性参数,以大渡河双江口水电站坝基河床砂砾石层基本特性研究为工程背景,进行大尺寸模型试验,研究河床砂砾石层的旁压模量和动探击数随密度、级配以及上覆压力的变化规律。根据室内模型试验结果,结合现场旁压试验及钻孔试验成果,推断出坝址区河床砂砾石相关层位的密度,并依此进行砂砾石室内力学试验,获得设计所需力学参数。研究成果可为深厚覆盖层基本特性测试提供新的方法。     

Serial discontinuities in a Rocky mountain river. I. Distribution and abundance of plecoptera

Samples were taken year-round at eleven sites along the altitudinal profile (2900-1400 m a.s.l.) of the Gunnison River, a 329 km tributary of the Colorado River, to document the distribution of the Plecoptera and to evaluate responses to hypolimnial-release dams in the headwaters and middle reaches. Twenty-two species were present, with the greatest species richness occurring in an unregulated segment upstream of the middle reach dams; average nymphal biomass over the study period (175 organisms, 395 mg dry mass m^?2) was also greatest in this segment. Only four species (58 organisms, 48 mg m^?2) were present in the tailwaters of the headwater dam and values were greatly reduced (nine species; 35 organisms, 180 mg m^?2) below the middle reach dams. The stonefly community recovered ca. 80 km downstream from the last dam (15 species; 244 organisms, 250 mg m^?2), apparently in response to natural resetting of environmental conditions corresponding to those above the middle reach dams. At the most downstream site (11) only four species (four organisms, 16 mg m^?2) were present. The observed distributional pattern is a classic serial discontinuity in response to hypolimnial stream regulation in a temperate latitude river.     

基于BP神经网络-马尔科夫链模型的隧道围岩位移预测

在隧道工程施工中,围岩位移预测起着很重要的作用。将BP神经网络-马尔科夫链模型引入到隧道围岩位移预测中来,通过对训练样本的学习,利用BP神经网络实现了对位移时间序列的滚动预测,同时得到了实测值与预测值的相对误差;在此基础上利用马尔科夫链对相对误差进行修正,有效地提高了预测结果的精度。并将该模型应用于某公路隧道拱顶下沉位移时序预测中,结果表明该模型具有精度高、科学可靠的特点,为隧道围岩变形的预测提供了新的途径。     

Short communication. Pipelines as a refuge for freshwater snails

In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment.     

浙江省水域调查录入系统的设计和应用

浙江省水域调查录入系统将调查数据与电子地图相整合,对分类水域数据进行统计计算,并对输入数据进行合理性和完整性检查,得到调查范围内现有水域的详细数据,实现了水域调查数据输入、计算、统计和查询的数字化管理,提高了工作效率和工作质量,为各地下阶段水域保护规划编制和水域管理工作提供了数据支持。对该系统的设计原则、功能和技术设计等作了介绍。     

基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。     

Automated system for removal and pneumatic transport of fly ash from electric precipitator hoppers

A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system, configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants of dry ash utilization and the advantages of producing of size-separated particles are considered. __________ Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008).     

The flood pulse advantage and the restoration of river-floodplain systems

The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed.