中性点

In chapter eight, the new software system named"simulation and protection scheme analysis of synchronous generator with internal armature winding faults", is developed and introduced. This software can be broadly applied to the analysis and protection study of synchronous generator with internal armature winding faults.

该系统能方便地对任意尺寸、槽数、极对数、绕组型式以及不同中性点联接方式等的大型水轮发电机和汽轮发电机进行各种内部故障电气量的计算，同时能对内部故障保护方案进行优化组合并校核其灵敏度，可广泛应用于大型同步发电机定子绕组内部故障分析与保护方案研究等场合。

By the mechanics analysis of pumping rod, the calculation model of the mechanics analysis of pumping rod and neutrality point of oil tube have been established. The function of pumping rod bend space length and account method have been derived and analysis example have been completed. The simulation of wellbore trajectory and the deformation curve of sucker rod and oil tube is also given.

论文对机械磨损和腐蚀对偏磨的影响进行了分析，通过对抽油杆和油管的力学分析，建立了下冲程抽油杆、管柱下部受力分析与中性点计算模型；给出了抽油杆变形的影响因素，建立了油井井身轨迹、抽油杆和油管在油井中的变形曲线模拟软件。

The mathematical model and working modes of a novel three-phase two-arm three-level neutral-point-clamped pulse width modulation rectifier suitable for direct-driving wind power system are analyzed in detail, and the constant frequency control strategies based on space voltage vectors are proposed and applied to the rectification conversion of direct-driven power generation system.

系统分析了新型三相两桥臂三电平中性点箝位脉宽调制(pulse width modulation，PWM)整流器的数学模型和工作模式，提出了基于空间电压矢量的恒频控制策略，并将其应用于直驱风力发电系统整流变换中。

This paper analyzes some practical cases of mal-operation of ground protection of power plant auxiliary equipment and then points out that the main reason resulting in mal-operation is incorrect grounding of shield cable and ground wire.

叙述了大型发电厂10 kV及以下厂用电系统中性点接地的几种方式，分析了作用于跳闸的接地保护在运行中几次误动的原因，同时，强调了零序电流互感器及电缆接地线在安装时应注意的事项。

From research,It is known that the flux of single-phase transformer would offset and exciting current of single-phase transformer would be distorted under DC current inrushing.

直流电流通过两个Y0连接的变压器中性点侵入电力系统，故针对三相三柱变压器直流入侵情况建立了直流入侵下的三相三柱变压器的电路模型和相应的方程，结合三柱磁路的麦克斯韦方程和非线性的B—H曲线方程，利用数字迭代法，在MATLAB环境下编程计算了三相三柱变压器直流入侵下的变压器励磁电流和谐波特征。

According to the fault case,the effect of singe-phase fault and open phase to transformer neutral ins.

结合实例，分析了单相短路和非全相运行时对不接地变压器中性点绝缘的影响，以及各种短路故障时接地变压器的耐热稳定性和耐动稳定性。

The method of grounding the neutrals of the transformers affects the degree of protection that can be given them and the amount of insulation they need.

变压器中性点的接地方式会影响到变压器被保护的程度以及变压器所需的绝缘量。

The reactance of this coil, which is connected between the neutral , and ground is made in the range 90 to 110 per cent of the value required to neutral ize the capacitance current.

联接在中性点与地之间消弧线圈的电抗值要在抵消90%至110%容性电流所需值的范围内。

This movement of the maneuver point however, unlike that of the N.P. is real, since the maneuver point is defined by the control force per g.

然而，机动点的移动不同于中性点的移动，前者是真实的移动，因为机动点是由每g操纵力来决定的。

There is a similar grounding pad on the three-phase transformer cover near the neutral point bushing.

在中性点套管附近三相变压器外罩上也设置类似的接地衬垫。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。