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14KV,0.0067uF. One advantage of these capacitors is that they have a self healing dielectric, so they can run closer to their maximum design voltage and suffer voltage surges without any permanent damage; if a dielectric punch trough occurs the metalized layer on the polypropylene dielectric vaporizes around the arc and the capacitor continues to work with only a slight decrease in its capacitance...

这些电容器的一个优点是，它们具有自我修复介质，这样他们就可以运行更接近其最大设计的电压和受害而没有任何永久性损害电压浪涌，如果发生介质冲槽上一层金属化聚丙烯弧周围介质蒸发和电容继续工作，只有在其电容略有下降。。。

In the third part, the simulation research on asynchronous motor DTC system base on six voltage space vectors and twelve voltage space vectors are realized in MATLAB/Simulink. Through comparisons of the two simulation results, the method of minifying torque ripple is obtained.

第三部分，运用MATLAB/SIMULINK进行了基于六矢量和十二矢量的两种异步电动机直接转矩控制系统的仿真研究，搭建了系统的仿真模型，并对仿真结果进行了对比，得出减小直接转矩控制转矩脉动的方法。

The stability of voltage and current outputted by HV DC power is important to generate stable high-voltage electric field .

直流高压电源输出电压和电流的稳定性对产生稳定的高压复合电场极为重要。

Features NPT IGBT technology low saturation voltage low switching losses switching frequency up to 30 kHz square RBSOA, no latch up high short circuit capability positive temperature coefficient for easy parallelling MOS input, voltage controlled ultra fast free wheeling diodes solderable pins for PCB mounting package with copper base plate

不扩散核武器条约IGBT技术特点的低饱和电压低开关损耗开关频率高达30 kHz的方RBSOA，没有闭锁了高短路能力正温度系数，方便parallelling马鞍山输入，电压控制超高速免费续流二极管，用于印刷电路板焊接的引脚与铜底板的安装包

Abstract］ Objective To appraise application value of indirect digital radiographyin silicosis diagnosing.Methods The chest of the confirmed diagnosis of 103 cases of silicosis and 25 objects of observation are radiographed by the CR common thousand voltage and the tradition high thousand voltage,appraise the radiograph quality and divide the period of silicosis.

摘要］ 目的评价间接数字X线摄影术在尘肺诊断中的应用价值方法将确诊的103例尘肺患者和25例观察对象，分别用CR普通千伏（60～70 kV）与传统高千伏（120～130 kV）拍摄其胸部X线片，对其胶片质量和尘肺分期进行评定。

The invention discloses an optical-fiber all-optical code converter, comprising a temperature control circuit as well as optical-fiber Mach-Zed interferometer, heat sink, semiconductor refrigerator, thermosensitive resistor and radiator, where the interferometer is composed of two cascaded 3dB couplers on the heat sink, the relation between length difference delta L of two arms of the interferometer and generated delay time difference delta T is that delta L=c.delta T/n, where c is light velocity in vacuum and n is refractive index of optical fiber; the thermosensitive resistor is used to detect temperature of interferometer, the temperature control circuit is used to compare feedback voltage of the thermosenstive resistor with a given voltage to regulate working current of the semiconductor refrigerator, and the semiconductor refrigerator refrigerates or heat two arms of the interferometer by the heat sink.

本发明公开了一种光纤型全光码型转换器，它包括温控电路和位于密封盒内的光纤型马赫-泽德干涉仪、导热热沉、半导体制冷器、热敏电阻以及散热片；干涉仪由位于导热热沉上的二个3dB耦合器级联而成，两臂的长度差ΔL与产生的延时差ΔT之间的关系为ΔL＝c。ΔT/n，c为真空中光速，n为光纤折射率；热敏电阻用于对干涉仪的温度进行探测，温控电路用于比较热敏电阻反馈的探测电压和设定电压，对半导体制冷器的工作电流进行调节，半导体制冷器通过导热热沉对干涉仪两臂同时进行制冷或加热。

On the basis of experiment analyses we would got that, When arc met with chute, it was blocked and had a stagnation, this made hot gas flow incrase near the chute; After arc went into the chute, mental vapor from arc root would lower the dielectric strength near the chute, meanwhile, High value of arc voltage and the corase face of the chute made electric strength increase. These factors might give rise to local restriking near the chute, and made arc voltage drop suddenly.

总结实验结果并加以分析，本文提出了这样的观点：电弧进入栅片时，在入口处受阻后的停滞，会使该区域的热气流增加；进入栅片后，弧根蒸发的金属蒸汽、电弧热气流会降低栅片入口区域的介质强度；电弧被栅片分割后，电压急剧上升，再加上栅片表面的不均匀会使局部区域的电场强度显著增加，这些因素的综合作用会导致电弧在栅片入口附近发生局部重击穿，引起电弧电压电压跌落。

The method retrenches PLL circuit,not bound by frequency offset and measures the fundamental current accurately when the network voltage is distorted or asymmetric.A simulation model of voltage source high power active power filter system is found in Matlab/Simulink software.

本文在Matlab/Simulink软件中搭建出系统仿真模型，并与采用单个PWM变流器的有源电力滤波器比较，验证了本文设计的方法能够在较低的器件开关频率下实现较好的补偿效果，具有良好的工业应用前景。

The purpose of this thesis is to investigate the impact of dispersed generation systems on the voltage regulation, voltage sags and harmonic distortion for the distribution systems.

这个论文的目的是在研究分散式电源在配电系统上的电压调整丶电压骤降与谐波失真的影响。

The selection of the main transformer's capacity is based on an eight-year development blueprint, and its overload capacities during normal operation as well as accidents have also been contemplated. The design adopts single inner-bridge connection for the 110kV voltage level, and sectionalized single-bus as the main connection for the 10kV voltage level.

主变压器容量根据8年的发展规划进行选择，并考虑主变压器正常运行和事故时的过负荷能力。110kV电压等级采用单内桥接线方式供电，10kV电压等级采用单母分段的主接线方式供电。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。