查询词典 voltage coil

Cascade multilevel converter is made up of modules. It can be normally divided into two kinds: one with same modules and the other with different modules. This paper analyzes the relationship among the maximum number of output voltage level, the number of cascaded modules, and the input voltage ratio and THD of output voltage in different kinds of cascade multilevel converter. Then, some guidelines for making up cascade multilevel converter are given.

级联型多电平变换器类似于积木化的结构，本文按模块单元的结构形式，将级联型多电平变换器分为相同单元和不同单元两类，以输出最大电平数为目标，系统地分析模块单元个数与最大输出电平数、输入直流电压与最大输出电平数、以及输出电平数与谐波畸变率之间的关系，从中归纳得到构造级联型多电平变换器的指导原则。

Main Products has combined three-phase overvoltage protection , high-low-voltage reactive power compensation and filtering device, high voltage current-limiting fuse combination of protective devices, high-capacity high-speed switches, arc and over-voltage protection devices and power quality management products, all products have independent intellectual property rights.

产品主要有三相组合式过电压保护、高低压无功补偿及滤波装置、高压限流熔断器组合保护装置、大容量高速开关、消弧及过电压保护装置及电能质量治理产品，所有产品均拥有自主知识产权。

The electromagnetic structure of voltage transformer,including the turns of secondary winding,the wire cross sections of primary and secondary windings,is optimized with the methods based on the finite analysis theory. The comparison between voltage transformers with and without optimization shows the magnetic field distribution is more reasonable in optimized voltage transformer,which enhances its magnetic field and reduces its size.

应用ANSYS有限元分析中的优化设计技术，对电压互感器的电磁结构(二次绕组匝数及一、二次绕组导线的截面积)进行优化，通过比较优化前后的结果，可以看出优化后电压互感器内部磁场分布更为合理，线圈中磁场的增强有助于进一步减小铁心的体积。

The measuring systems are successfully used in the electromagnetic pulse measurement generated by impulse voltage discharge and switch operation in 500kV substations. Full waveforms of transient electric field, transient magnetic field, transient voltage of high frequency relay channels and low voltage alternative current power during switch operation period have been obtained, and the fast transient pulses in high frequency relay channels and AC power have been caught.

将该套测量系统成功地应用于500kV变电站开关操作产生的电磁脉冲的研究中，得到了开关刀闸操作时暂态电场、磁场、高频通道、交流电压等的完整波形，发现低压交直流电源系统和高频保护通道中存在非常严重的脉冲群干扰，初步解释了变电站二次电源模块经常损坏和高频保护经常误动的原因，提出了加强保护和研究的建议，进一步验证了测量系统的先进性。

The principle of electric tar Filter is that, high voltage electric field formed by direct voltage with voltage between 40～60 KV makes the tar in gas fuel to be absorbed and deposited in electro tar precipitator.

电捕焦的原理是利用40～60 KV 的直流电压形成高压电场，通过沉淀极，使气体中的焦油在电捕焦油器内吸附、沉淀，提高焦油过滤效率，降低设备成本。

Based on the facts and reasons of Chint Group Corporation are: Schneider Electric Low Voltage Co., Ltd. produced and sold 5 items song limit's rocker-shaped mini-circuit breaker products,which violated the High Breaking Miniature Circuit Breaker of Chint Group Corporation's the utility model patents numbered ZL97248479.5. From August 2, 2004 to July 31, 2006, Schneider Electric Low Voltage Co., Ltd. produced and saled infringing products more than 880 million yuan. Through the product margins that it reported to the department of commerce and tax , the Schneider Electric Low Voltage Co., Ltd. Had earned more than 334.8 million yuan.

正泰集团的事实与理由是：施耐德电气低压有限公司生产并销售的5款带曲形限位器的摇臂的小型断路器产品，侵犯了正泰集团一项专利号为 ZL97248479.5&高分断小型断路器&的实用新型专利，2004年8月2日至2006年7月31日，施耐德电气低压有限公司共生产销售侵权产品价值8.8亿多元，通过其上报工商、税务部门的产品利润率计算，施耐德电气低压有限公司获利3.348亿多元。

Considering the shortage of voltage sensitivity in small source impedance ratio systems and with high resistance earth fault, the voltage fault component is replaced by memory voltage component to determine the fault's direction.

针对无穷大电源系统中和经高阻接地时存在的电压灵敏度不足的问题，采用保护安装处的记忆电压代替其电压故障分量，从而使保护可以可靠地判别出故障的方向。

To improve the stability of Arcjet discharge plasma in low current and high voltage mode, research on the demand of output characteristics of Arcjet Power Conditioning Unit was conducted. In this paper, based on PWM invertors and current mode control, using MOSFET as the main power device, an Arcjet Power Conditioning Unit was developed. Through adding a closed loop feedback circuit of output voltage, it can make the output characteristics of PCU be positive resistance to ensure the stability of Arcjet discharge plasma. The experiment indicates that this PCU can make Arcjet engine work at high voltage mode (100 V, 10 A) and ensure the stability of arcjet discharge plasma. Finally, it provides the experimental data of Arcjet when working.

为了解决小电流、高电压下电弧火箭等离子体的稳定性问题，研究了电弧火箭发动机对电源调理单元的输出特性要求，基于逆变电源脉宽调制技术与峰值电流型控制原理，以MOSFET为主功率器件，研制了一台电弧火箭电源调理单元，给出了Arcjet工作时的实验数据，通过增加PCU输出电压的闭环反馈电路，可以使PCU的输出外特性呈现正阻性，保证电弧的稳定燃烧，实验结果表明，该电源调理单元能使电弧火箭发动机达到高电压工作模式(100V， 10A)，保持电弧工作的稳定性。

It is also a key component that the management of accumulator in P-V system. The plan of the management of accumulator is enacted in the paper, which joints the charge and discharge characteristic of the accumulator together with P-V system's uniqueness, it takes the measures of low-voltage protection、over-voltage protection and the temperature compensation at the point of over-voltage protection.

光伏系统中对蓄电池的管理也是一个关键部分，本文结合蓄电池的充、放电特性以及光伏系统的独特性，制定了蓄电池的管理方案，采取了欠压保护、过压保护以及过压保护点的温度补偿。

The influence of impulse voltage waveshape on particle-initiated breakdown voltage of a GIS system in SF6 and SF6/Air mixtures is reported. The results are compared with the characteristics of air gaps. For the SF6 gaps, breakdown voltage depends on wave-front duration but almost independs on wavetail duration. For the gaps in SF6/Air mixtures, the influence of impulse waveshape also depends on SF6 contents and electrical field non-uniformity

作者研究比较了正极性冲击电压波形对SF_6、空气、SF_6/空气的 GIS 电极装置由固定导电微粒引发的击穿电压的影响，结果表明：SF_6间隙的击穿电压受冲击电压波前时间长短的影响较大，而与波长的关系不大，当采用SF_6/空气混合气体时，则这种影响随SF_6含量增大而愈明显，并与电场不均匀程度有关。

We recognize that every child has different multiple intelligences.

我们认识到，每个孩子都有不同的多元智能。

Take them off and you'll find one in a pillowcase to sleep on.

此外，你也会看到床上有两张床单，你要睡在它们中间，这样被子和床罩就不会弄脏了