To install series reactors in 500 kV systems can effectively limit the short-current level of the system without having to change the grid structure and affecting the flow distribution and grid stability, thus can ensure normal operation of circuit breakers.
在500kV系统中装设串联电抗器可以在不改变电网结构、不影响潮流分布和电网稳定性的条件下有效地限制系统短路电流水平，从而确保断路器的正常运行。
The safety system shall have higher-priority access to at least two braking s ystems and to equipment for grid disconnection of the generator and, once triggere d by deviations from the normal operating values, shall carry out its task without d elay, keep the wind turbine in a safe condition and in general initiate deceleration of the rotor with the aid of all the braking systems at its disposal.
3安全系统至少对两套制动系统有优先权，对发电机从电网断开的设备有优先权，一旦被偏离正常运行的参数触发，安全系统必须立即执行其任务，使风机处于安全条件下，并且调控制动系统，使风轮开始减速。
Results show that the normal forms of diffeomorphism theory can reflect the nonlinear characteristic of power grid better, and the location to implement load control and place to allocate SVC can be effectively decided.
结果表明，微分同胚正规形方法能更好地反映电力系统的非线性特性，有效地确定实施负荷控制措施的地点以及SVC的安装地点。
The main research contents are as follows:1. Through massive calculation, analysis and comparison, sum up the similarities and differences between the special-shaped cross sections and rectangular cross sections in mechanical features, between reinforced concrete special-shaped columns and rectangular columns in load-bearing capacity, ductility performance and provide necessary basic concepts and data for further understanding the characteristics of the special-shaped columns; 2. Through massive elastic calculations and elasto-plastic analysis, under the preconditions of satisfying the code`s requirements for axial compression ratio, limit value of lateral displacement and load-bearing capacity of normal section, oblique section and beam-column joint, under circumstances of different intensity of earthquake, structure dead weight, sort of site and column grid bay dimension, the variation regularity of maximum suitable height of structure, and thus sum up the maximum suitable height of structure for code for the purpose of macro-control while deciding the design scheme; 3. Make a preliminary study on the stress feature of reinforced concrete special-shaped column and Z-shaped column of which the ratio of limb length to limb thickness is between 4~5, and the preliminary design method is suggested; 4. Through elato-plastic time history dynamic analysis of typical projects, check up the weak storey of the special-shaped column structure and yielding, breaking and collapse mechanism to satisfy the earthquake resistant requirement to buildings of remaining stand under strong earthquake; 5. Derive for project use simplified calculation formula of vibration period, suitable vibration period, suitable rigidity of special-shaped column structure through theoretical analysis, and provide an easy and practical method for deciding the structure scheme economically, safely and reasonably; 6. Based on the study achievements in theory and massive analysis and calculations of this paper, sum up the regularities of inner force, deformation of special-shaped column structure and seismic conceptual design, and thus the suggection of seismic design of special-shaped column structures is presented.
本文研究的主要内容如下：通过大量的计算、分析和对比，总结出异形截面与矩形截面在力学特性、钢筋混凝土异形截面柱与矩形截面柱在承载能力、延性性能等方面的异同，为深入了解异形截面柱的特点提供必要的基本概念和数据；通过大量的弹性及弹塑性计算分析，在满足规程对轴压比、侧移限值及正截面、斜截面、节点承载力抗震验算要求的前提下，在不同抗震设防烈度、结构自重、场地类别及柱网开间尺寸情况下最大适宜高度的变化规律，并在此基础上总结归纳出异形柱结构的最大适用高度规定，可用于规程，以便于在确定方案时起到宏观控制的作用；对肢长与肢厚比在4～5的钢筋混凝土异形截面柱及Z形柱的受力特点进行初步探讨，提出初步的设计方法；通过对典型工程的弹塑性动力时程分析，检验异形柱结构的薄弱层及屈服、破坏、倒塌机制，以达到建筑物大震不倒的抗震设防要求；通过理论分析，推导出异形柱结构自振周期，以及适宜自振周期、适宜刚度的工程实用简化计算公式，为经济、安全、合理地确定结构方案提供简便实用的方法；在本文理论分析、计算以及大量的研究成果基础上，总结归纳出异形柱结构内力、变形的规律及抗震概念设计内容，并在此基础上提出异形柱结构的抗震设计建议。
First, detailed analysis to off-normal voltage and element overload in the grid of Langfang have been made.
首先对廊坊电网各种运行方式下的元件过载、电压越限情况作了详细的分析。
With the example of Kangjiagou watershed, the contour line data were preceded in AutoCAD and ArcView software to create regular grid DEM data of ASCII form. Drawing triangle strip according to those data, calculating the normal value of each point with weighted average model, setting lighting and material model, adding dynamic sky background, making wander scene and view in different directions successfully combined with interactive function, all these ways to make sure the real sense three-dimension visualization of the small watershed had implemented well.
以黄土丘陵沟壑区康家沟小流域为例，等高线数据在AutoCAD和ArcView软件中处理，生成ASCII格式的规则网格DEM数据，依据它们绘制三角形带，采用加权平均法求得各点的法向量，设置光照与材质模式，添加动态天空背景，实现了该流域地形的真实感三维虚拟，并增加交互能力，完成自由漫游与多角度观察。
Expected frequency variations at PCC during normal operation of the grid: Minimum and maximum expected deviation from nominal value of frequency at PCC.
电网正常运行的接入点频率变化：与接入点额定频率相偏离的最大和最小差值。
The wind generator operates in MPPT mode and the grid-side converter controls the dc voltage in normal condition.
正常情况下，发电侧变流器控制发电机工作在最大风能跟踪模式，向直流系统输送尽可能多的有功，网侧变流器维持直流电压。
Pullout test has been done in laboratory to study the influence of water content to interaction characteristics between warp knitting geo-grids and soil. Test results show that the quantity of apparent frictional resistance between geo-grid and soil is decreases as the water content of the soil increasing when the normal stress keeps invariable, the apparent cohesion and apparent friction angle are both decrease as the water content increasing whether the failure format between warp knitting geo-grids and soil is the geo-grids pulled out or longitudinal gill pulled out, and the range of the normal stress within which the failure format between warp knitting geo-grids and soil changes from the entirety warp knitting geo-grids pulled out to longitudinal gill pulled out is increases as the water content increasing.
通过室内拉拔试验研究了不同含水率条件下经编土工格栅与土体间的界面作用特性，试验结果表明：在相同的法向应力下，土工格栅被拔出破坏时对应的极限表观摩擦阻力随着土体含水率的增加而降低；不论土工格栅是整体被拔出破坏还是纵肋被拔出破坏，土工格栅和土体界面间的表观摩擦角和表观粘着力均随着土体含水率的增加而降低；土工格栅与土体界面间的破坏形式由土工格栅的整体被拔出破坏转变为纵肋被拔出破坏时对应的法向应力随着土体含水率的增加而增大。
Emanometer is composed of normal atmosphere air mesh grid pulse ionization chamber, signal magnify and screen unit and MCU system.
仪器主要包括常压空气网栅脉冲电离室，信号放大与甄别和单片机系统。
To numerically solve N-S equations, the present work is mainly focused on the following aspects: 1. Solving the elliptic grid generation together with an algebraic method marching along the normal-to-wall direction, viscous grids around complex geometries are generated.
采用沿物面边界法向外推方法和求解椭圆型偏微分方程方法相结合，进行复杂外形的粘性网格生成。
Methods The macular threshold program of Humphrey field analyzer, pattern visual evoked potential and Amsler grid were used in 44 cases (58 eyes) with early AMD and 40 normal cases (51 eyes) (control group).
方法对老年性黄斑变性（AMD）早期患者44例（58只眼）进行黄斑光敏度、图形视觉诱发电位和Amsler表检查，并与健康人40例（51只眼）上述检查作对照比较。
The algorithm is based on the triangle Bezier fractionization of existed triangle grid, the normal vectors of the three vertexes of subtriangles are recalculated through quadric interpolation and the realistic rending method of subtriangles is still Gouraud shading.
这种算法在对已有的三角网格进行三角Bezier细分的基础上，仅对细分后的子三角形顶点进行法矢二次插值优化，细分后的子三角形的真实感显示仍旧采用Gouraud明暗处理来改善效果。
Grid effect is crucial to aerothermal simulation. Heat transfer prediction is very sensitive to grid spacing in normal direction near the wall.
气动热的数值模拟中，网格因素非常关键，计算结果对网格，特别是壁面附近的法向网格间距十分敏感。
With fast development of power grid and rapid increase of electricity load, it has become an extremely urgent issue of limiting short circuit current to normal level in Chinese power system nowadays.
随着电力系统容量和规模的不断增长，电网的短路电流水平也日益增大，限制短路电流已成为电网发展中一个紧迫而亟待解决的问题。
In addition, if the large-scale wind farm temporarily separated from the power grid, it would be difficult to return the fluctuating frequency to its normal value.
除此之外，大规模风机暂时脱网，将导致系统频率波动，短时难以恢复至工频。
Dinates of the bivariate normal distribution In many cases sample coordinates are recorded on an orthogonal grid coordinate system.
在多数情况下，样品坐标记录在正交网络坐标系。
Based on the assumption of random installation deviation, the finite element met hod analyzing the initial displacement and stress of grid structures was set up. The random installation deviation was assumed as normal distribution.
基于随机安装偏差模式，利用空间有限单元法和概率方法，分析了网架结构由于安装偏差引起的初始应力和初始位移。
Since new power grid operation standards required that WTG should maintain certain time parallel operation during system fault, the short circuit current supplied by it would affect normal operation of protective relaying equipments and safety of electrical devices.
由于新的电网运行准则要求电网故障期间风电机组必须保持一定时间的并网运行，其提供的短路电流会直接影响到继电保护装置的正常运行以及电气设备的安全。
When it works at the normal incidence, difference between the designed grating and conventional wire-grid is that the former adds the magnesium fluoride between the fundus and the grating, and the TM polarization transmission efficiency and the extinction ratio are increased.
所设计的光栅与传统金属光栅不同之处在于基底和光栅之间增加了氟化镁介质，在垂直入射条件下，TM偏振透射率及消光比都增大。