In this paper, two types of main power circuits and their control methods are introduced when constructing active power filter in three phase four wire system.
本文介绍了在实现三相四线制有源电力滤波器时所采用的两种不同的主电路结构及其控制方法。
The equipment should be placed on the ground without violent vibration or on the working stage and connected in the power grid of 380v with three phase and four wire.
设备应放置在无剧烈振动的地面或工作台上，接入三相四线380v的电网。
Experimental results prove the proposed control method can compensate the harmonic, negative sequence and zero sequence current components in the three phase four wire.
实验结果表明，该装置可对三相四线制系统中的谐波、负序、零序等电流分量进行补偿。
This paper introduces an active power filter device used for three phase four wire. The compensation principle and structure of main circuit and control circuit are given.
主要介绍用于三相四线制的有源电力滤波装置的研究工作，给出了系统的基本补偿原理、主电路及控制电路结构，并利用该装置进行了补偿实验。
In other words, the circuit may be physical two - wire (or even physical one - wire) and logical four - wire, performing as a four - wire circuit but employing fewer than four wires.
换句话说，电路可以是物理双线(甚至是物理单线)、逻辑四线，它使用较少的线实现四线电路。
Firstly, the existing methods of the three phase power measurement in the teaching materials are introduced. And then another three connection methods are suggested for three phase four wire circuits.
首先介绍了现有教材中已给出的三相电路功率的测量方法，进而提出了三相四线制三相电路功率测量的另三种接线方法。
They produced a long metal wire four elements - the smallest of the superconductor are currently reported.
他们制作了四个分子长的金属线——目前有报道最小的超导体。
Another improvement, by the famed inventor Thomas Alva Edison (1847-1931) in 1874, was the Quadruplex system, which allowed for four messages to be transmitted simultaneously using the same wire.
另一项技术进步——四路系统，由著名发明家托马斯·阿尔瓦·爱迪生(Thomas Alva Edison, 1847- 1931)于1874年发明，它可以使四条信息在同一条电报线上同时传送。
An official described the compound as having "extraordinary" security measures, including two security gates and walls three to four meters high topped by barbed wire.
一位官员称那个建筑备有“特殊”的保安措施，其中包括两道安全门和三、四米高的围墙，上面设有铁丝网。
Each of the four cables contains 26,108 lengths of wire.
这四根缆索。每一根都包含有26,108根钢丝。
The completion of the foundation buried stone heads, four measurements, a flat wire measurement, substandard level of measurement, map the root control field data collection and data editing.
完成了基础埋石、首级四等测量、一级平面导线测量、等外水准测量、图根控制等野外数据采集以及数据编辑工作。
In fact, a four - wire circuit can be established without the use of any wires at all, as in the case with a circuit established over microwave, satellite, or infrared transmission systems.
事实上，可以不使用任何线来建立四线电路，例如通过微波、卫星或红外传输系统。
For added holding and pulling strength, drive four nails through the snake and the drilling line, and wrap the snake with soft wire and tape the entire length.
为了增添抗拉强度，在穿接绳器的部位，再钉四个钉子，然后用铁丝和胶带包起来。
Four, and then the (AC) region of the L, N access to the 220V power supply (2.5 of copper core wires), such as the installation position is low, the best grounding wire.
再将变压转换器的（AC）区域的L、N接入220V电源（2.5的铜芯电线），如安装位置较低，最好接上地线。
In 1874 he invented and sold to Western Union a system by which four messages could be sent over one wire at the same time, two in each direction.
1874年他发明并售给西联电讯公司一种装置，用了它可以在一根电线上拍发四份电报，即从每一方向可同时拍发两份电报。
Notice that this is a two-wire resistance measurement compared to using the electrometer voltmeter and external current source, which can make a four-wire measurement.
注意，这种测量方法是两线电阻测量，而使用静电计电压表和外部电流源则可以进行四线测量。
The paper studies the profile synthesis in the four axes simultaneous control wire EDM.
对四轴联动数控线切割加工进行轨迹合成研究。
Although the absolute cost of four - wire circuits is higher than that of two - wire circuits, they offer considerably improved performance.
尽管四线电路的绝对成本高于双线电路，但它显著地改进了性能。
Reinforcement: a braid of textile material over the inner tube and four spiral plies of heavy steel wire wrapped in alternating direction.
加强层：四层交互缠绕的高强度钢丝和包覆在内胶外的纤维编织层。
Drape up to four ties or scarves across the bottom of a wire hanger and fix each in place with a pin.
将领带或围巾(最多四条)挂在衣架底部，并用晾衣夹予以固定。
The solar cell module adopts four-wire connection. It uses high-speed data acquisition system. It ensures the accuracy of the current measurements of the solar cell.
太阳电池组件采用四线连接，以及高速数据采集系统，确保了太阳电池电流测量的准确性。
By simulating the features of two -, three -, four-high mill with finite element method, the geometric shape, micro-structure and mechanical property of wire section are analyzed.
分析了用有限元法模拟线材二辊、三辊和四辊轧机轧制的特点，对线材断面的几何形状、微观组织和机械性能进行了介绍。
Especially three-phase four-wire active power filter hardware has simple structure with only three group switch device.
特别是三相四线制有源电力滤波器硬件结构简单，只有三组开关器件。
To measure component values accurately, most testers can make two-wire, three-wire, or four-wire measurements.
为了使测试更加精确，很多测试设备可以构成两线、三线或四线测量。
This paper offers a better theory basis for improving compensation capability of the three-phase four-wire APF controlled by hysteresis current control strategy.
该文的理论推导和所得结论为改善三相四线并联apf应用电流滞环控制时的性能提供了较好的理论基础。
The power supply of wastewater treatment is connected from the nearest access. Production electricity and lighting equipment adopt 380/220 three-phase four-wire power supply.
污水处理站供电由就近的生产接入，生产设备用电及照明采用380/220三相四线制供电。
The control circuit is a self-balancing current loop which makes use of a four-terminal resistor of nickel wire to assure a close-loop both electrically and thermally.
控温电路采用四端电阻自平衡电流环路，从而保证其电气和温度均处于闭环状态。
The adjacent mat group on four corners by binding wire connection;
相邻网垫组的上下四角以绑扎丝衔接；
To help researching the lunar radio telescope, the transmission coefficient of odd mode four-wire transmission line transformer is derived.
本文为了配合月球射电仪天线的研究，推导了奇模四线传输线变压器的传输系数。
To help researching the lunar radio telescope, the transmission coefficient of odd mode four-wire transmission line transformer is derived.
本文为了配合月球射电仪天线的研究，推导了奇模四线传输线变压器的传输系数。
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