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1)  station roadbed
站场路基
1.
Based on monitoring data of some Qinghai_Tibet Railway station roadbed, ANSYS was used to simulate temperature fields underneath from the year .
在多年冻土区修建铁路站场路基,打破了原来天然地表与外界的热力平衡,地下温度场将重新分布。
2)  railway station
铁路站场
1.
Calculation of the traffic capacity is one of the most important steps in railway station design.
通过能力计算是铁路站场设计的重要组成部分之一。
2.
Railway station is the window for railway traffic, while the station yard, the main technical device of railway station, takes the responsibility for centralizing and decentralizing passengers and freights.
车站是铁路运营的窗口,站场是车站的主要技术设备,铁路站场担负着铁路客货运输的集中与分散。
3.
This paper introduces the alternate construction scheme between Suzhou rail transit line 2 and rail station, the protection schemes of rail station are also introduced under which shield construction from Suzhou railway station to the third People\'s Hospital in Suzhou is conducted.
介绍了苏州轨道交通2#线盾构与站场的交叉施工方案及苏州火车站至第三人民医院站区间盾构隧道下穿铁路站场的保护方案,并对交叉施工方案和保护方案的优缺点进行了分析比较。
3)  railway station region
铁路站场
1.
Ground surface settlement control norm for tunneling under railway station region in soft soil;
铁路站场下暗挖隧道地表沉降控制基准研究
2.
The construction process of the underground tube penetrating a railway station region in Changchun is simulated and calculated with FEM theory, and the influence on the adjacent surroundings is discussed, which provides theoretical guidance for the construction.
根据有限元分析理论,对长春铁路站场下人行通道施工动态进行了模拟计算,分析了其施工过程对周边环境的影响,为实际施工提供了理论指导。
4)  railway station and yard
铁路站场
1.
Here is a brief introduction to the classification, the character and applicative condition of railway station and yard drainage system; and a study to the choice of different systems and the way of obtaining shallower embedment.
简要介绍铁路站场排水系统的分类、特点和适用条件,探讨系统的选择和减少埋深的方法。
2.
Here is a general analysis to the demand by taking account of the constitution of integrated application software for railway station and yard ground plan and the fact of resource reuse, and a proposal of the schematic design and object of the software.
就目前国内铁路站场平面辅助设计软件应用现状,针对铁路站场平面一体化应用软件的架构、资源二次再利用进行总体需求分析,提出了站场平面一体化应用软件思路及基本实现方法,并简略地阐述了应用软件主要实现目标。
3.
First-stage Work of Nanjing Subway Project--Nanjing subway station, safely underpass railway station and yard through mining method, here is the introduction of the safety control technology involved: reinforcing station and yard track with temporary construction beam, shoring pipe shed in advance, and CRD tunneling
介绍南京地铁一期工程南京站用矿山法通过铁路站场的安全控制技术,即站场轨道采用施工便梁加固,大管棚超前支护,隧道施工采用CRD法。
5)  Highway terminals
公路站场
1.
On the basis of setting up the reasonable system of evaluating indexes,the planning project of highway terminals is comprehensively evaluated by means of combining entropy method with TOPSIS method.
确定合理的评价指标体系,并在此基础上将熵权法和TOPSIS法相结合对公路站场规划方案进行综合评价。
6)  railway yard
铁路站场
1.
The experimental research of concrete discharge ditch sliding formwork of railway yard;
铁路站场混凝土排水沟滑模的试验研究
2.
Study on the System of Computer Aided Railway Yard Design;
铁路站场计算机辅助设计系统的研究
3.
3 Yard of Hudong Station,Daqin Line as an example,this paper expounds the optimization Retrofit scheme of lamp bridge lighting in railway yard from the aspects of economy,maintenance and security.
以大秦铁路湖东站三场为实例,从经济、维修、安全等方面,对铁路站场灯桥照明优化改造方案进行了论述。
补充资料:换流站交流开关场故障


换流站交流开关场故障
faults in the AC switch yard of converter station

  huonl一uzhonJ一001}u ko一guonehong guZhong换流站交流开关场故障(faults in the ACswiteh yard of eonverter station)主要指发生在换流站交流开关场范围内的故障,即发生于换流母线、换流变压器、交流滤波器、并联电杭器或其它无功补偿设备、交流断路器及隔离开关、连接导线等主回路或交流主设备的故障。按照故障对直流系统的影响可分为与换流器并联设备故障和主回路设备故障两类。 与换流器并联的设备故障,如交流滤波器、无功补偿装里及其连线部分的故障。这部分故障将由交流系统提供故障电流,故障电流的大小取决于交流系统的强弱。如果故障设备退出运行将引起交直流系统交换无功的不平衡,或在交流系统中产生的谐波分量增大,进而引起直流系统的停运。交流滤波器和并联电容器组发生的故障通常为内部短路故障。滤波器中的电容器结构安排为“H”的对称桥形,当一个或数个电容元件短路损坏并达到一定数量时,将在健全的电容器元件上形成不可接受的过电压应力。此外,由于设计不当或非正常的运行可能引起交流滤波器内部的电阻器或电抗器元件的谐波过负荷,以造成元部件的过热。在交流滤波器的并联电路中元部件发生短路时,同时还会引起其单相阻抗的改变,在滤波器中出现零序电流及引起交流滤波器的失谐。与常规交流系统中同等电压等级的交流断路器相比、交流滤波器断路器投切频繁,且投切时的电容电流和涌流很大,因此设计时应考虑足够的裕度,以确保直流系统的安全运行。 主回路交流设备故障,主要指换流母线、换流变压器及其网侧断路器,以及换流变压器至换流器之间的连线等处的故障。对于整流侧,发生换流母线单相短路时,直流电压将降低,直流输送功率将减少,同时直流电压中含有IOOH:的谐波。整流侧换流母线发生三相短路时,将失去换相电压,直流输送功率将为零。对于逆变侧,当交流系统发生故障时,由于换流器交流侧电压降低,引起直流反电动势降低、直流电流瞬时增大,如果电压下降严重,会继而引起换相角的明显增大,这些都将可能最终导致逆变器的换相失败。 特别要指出的是,如果在运行中逆变侧的换流变压器网侧断路器发生无故障跳闸,则视断开点和交流滤波器投人的组数不同,而产生数倍的过电压,相关的设备将承受很大的应力。 换流变压器故障除本体故障与常规变压器相同外,还应特别注意其阀侧绕组对地短路故障,其故障点与站内接地网形成回路,相当于换流桥的桥行短路(见换流器故阵)。此外,换流变压器的冷却系统故障、分接头控制和执行机构的故障,都将可能导致设备的损坏和直流系统的停运。当换流变压器投切时,往往会产生较大的激磁涌流,必须避免在某些情况下可能导致交流系统继电保护的误动.直流输电系统在正常或暂态工况下,会产生各种特征或非特征谐波,应该注意这些谐波对交流系统中继电保护的影响。
  
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