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In this paper the reason of rapid increase of single phase short circuit current in 500 kV substation is analyzed. Through the calculation it is proved that neutral grounding by small reactance is an effective measure to reduce the single phase short circuit current, and the calculation method of the zero\|sequence reactance after autotransformer neutral grounding by small reactance being applied is expounded.

文中研究了500kV变电站单相短路电流急剧增长的原因，计算了变压器中性点经小电抗接地对限制单相短路电流的作用，论证了经小电抗接地是限制单相短路电流的有效措施之一，并阐述了500kV自耦变压器中性点经小电抗接地后，其等值零序电抗的计算方法，可供工程参考。

In order to study the negativesequence influence to regional power grid caused by autotransformer traction power supply system, formulas of NSeq current and threephase voltage imbalance were derived, based on current distribution analysis of AT traction power supply system and singlephase VVconfiguration train substation. Employing the "train diagram" method, the realtime voltageimbalance curve was obtained in a simulation study, as well as the factors that influence NSeq and some measures to restrain it.

为研究自耦变压器牵引供电系统对地区电网造成的负序影响，首先讨论了AT牵引供电系统、单相VV接线牵引变电站的电流分布，推导得出了负序电流、三相电压不平衡度的计算公式；然后结合"列车运行图法"开发了相应的仿真程序；最后通过一个实际算例，得到了实时电压不平衡度曲线，指出了负序大小的影响因素及相应措施。

This figure shows that the E 譈 current is by far the most significant portion of the azimuthal current.

这一个身材表示 E 譈涌流是方位角涌流的显然最重要部分。

In this paper, the change of back electromotive force current with the different PWM modes are analyzed in detail on the base of BLDCM model. According to theory and experiment ,ON-PWM type restrains the peak value of back electromotive force current and brings the lest effect to the motor control system.

基于无刷直流电动机的数学模型，分析比较了不同PWM调制方式下反电势电流的变化规律，并通过理论推导和仿真实验证明了当电机系统采用ON-PWM调制方式时，能有效地抑制反电势电流的峰值且对电机控制系统造成的影响最小。

The text starts with the background of the task, analyses the current common invoice models of tax system, and points out the open questions of current management.

本文从课题的背景入手，对税务系统现行普通发票管理模式进行了分析，并指出了目前管理中存在的问题。

The bridge loses balance and sensitive parts have a output signal,which will transform to related current signal after differential magnifying and conversion between current and voltage. Linear 4~20mADC standard signal is formed by compensation of magnifying and non-linear rectified ring circuit ,and second temperature compensation.

输出的电信号，经过差分放大，电压电流转换，变换成相应的电流信号，通过放大和非线性矫正环路的补偿，以及精密的二次温度补偿，产生与输入压力输成线性关系的4~20mADC 二次制标准信号。

A new harmonic harmonic and reactive current detection method and a harmonic current detection method base on bandpass filter are introduced in this thesis.

提出两种新的检测方法，检测谐波及无功电流的改进算法和只检测谐波的基于数字带通滤波的检测算法。

Furthermore, this experiment, if interpreted in the old language, gives us no hint at all as to whether an induced current can be excited by the motion of another circuit carrying a current, instead of by motion of a bar magnet.

但是根据场论的观点看来，一个电流表示有一个电场的存在，这个电场迫使电流体在导线中流动。当磁棒再静止时，电流便消失了，电场也同样消失了。

The second part analyzes the establishment of current RMB exchange rate system, and explains the base of current RMB exchange rate system reflected on exterior surroundings and interior mechanism.

第二部分分析了现行人民币汇率制度的形成，并从外部环境和内部机制两方面分析了现行人民币汇率制度的生存基础。

Sediment from river is not the main source of the Rushan Bay now any more ,which leads to the change of balance of sedimentation power. Sediment will transport because of the drive of hydrodynamic elements in macroscopic view .Direction of suspended load is basicly the same as tidal current .Flood tide makes suspended load transport to tip of the inner Bay and to the Mouth in exterior Bay .The direction of longside sediment transport in two sides of the Mouth mainly focus in the Mouth .Because the coastline along the exterior Bay is very meandering and it belongs to the type of bedrock ,besides some sediment going into the inner Bay ,so actual net sediment discharge rate is less than calculation .It develops an ebb delta out of the Mouth and forms tidal sand ridge ,tidal washing canal ,barrier bar and marine physiognomy ;The result of model simulation disclosures that differences of sediment erosion and siltation between single tidal action and wave-current action are very big .From the analysis of sediment composition、sediment sources and stability of beach and ridge ,this article gets the conclusion that the channel has the possibility to silt ,though the course maybe very slow.

通过分析研究文章得出如下结论：沉积物平面分布与水动力的时空变化存在很好的相关性；口门外发育落潮流三角洲，形成潮流沙脊、潮流冲刷槽、浅滩、拦门沙等水下动力地貌；乳山湾河流来沙已不是湾内泥沙主要来源导致沉积水动力平衡发生改变，宏观上表现在泥沙受水动力驱动发生不断运移；悬沙运移方向与涨潮流方向基本一致，湾内涨潮流带来的悬移质泥沙向湾顶运移，湾外悬移质泥沙主要向口门方向运移；湾口两侧岸段沿岸输沙方向均指向口门方向，由于乳山湾外海岸线曲折，两侧岸段以基岩为主，加之部分泥沙进入湾内，实际净输沙量小于计算值；数值模拟发现潮流单独作用与波流共同作用下泥沙蚀淤模拟差别较大；从沉积物组成、泥沙来源及滩槽稳定性三个方面分析，文章认为研究区存在航道淤积的可能性，但过程相对较慢。

This time, we do not want to colorize the image. I've dragged my Hue slider to the left to a value of -123

这次不要勾选着色，我将色相的滑标向左移到-123

A timely report from an independent prosecutor would surely be helpful in buttressing and justifying that order.

及时报告从一个独立的检察官一定会有助於支撑和合理的秩序。