三相供电

对于单相变三相供电方式中的逆变器输出部分，提出了一种电压电流双闭环控制方法，实现了输出电压跟随参考信号变化，从而保证平衡变压器两相电压的正交性。

It is proposed a double close-loop control method towards the inverter part of the single-phase to three-phase power supply , which keeps the output voltage along with the reference signal .

所以设计一个集测量、显示和通信一体的高效率、低成本、高可靠性的三相供电质量的监测系统，用于配电室中作为监控装置是很有价值的。

So it is very valuable to design a three-phase power supply quality monitoring system include measure , display , communication and high efficient , low cost , high reliability which is used in power distribution room as monitoring device .

住宅小区中单相供电与三相供电方案的技术经济比较

Comprehensive Compare Single-Phase With Three-Phases Scheme in District Power Supply Planning

农村电网单三相供电经济技术浅析

Analysis About Single-Phase and Triphase Power Supply in the Country

三相供电线路的漏电流分布规律

The distribution law of leakage current in three-phase supply lines

关于三相供电系统中零线断路的探讨断线（绽线或磨断）

On the Broken Circuit of the Negative Wire in Three-phase Power Supplying System ;

这些特点决定了传统的三相供电在农村配电网中有一定的局限性。

These characteristics determine that the traditional three-phase electricity lines in rural power distribution network have certain limitations .

然而频繁出现因为电源不平衡导致整个系统工作不正常，经常发生电机烧毁和不能按预定程序动作，所以在三相供电系统中往往要求有三相交流电源保护装置。

But the imbalance of power system often leads to the whole system works badly , and the motor even be destroyed and do not work according to the pre-program . So the tri-phase AC power safeguard equipment is demanded in the tri-phase AC power supply system .

在矿井三相供电系统中，中性点不接地系统中单相故障接地相的判断法：三相电压中以指示值最高相为依据，按相序顺序往下推移一相才是故障相。

In the three-phase power supply system in mining wells , the method to detect the single-phase breakdown earth phase in the system of neutral point unconnected to earth is the next to the phase with the highest voltage in the three-phase voltage is the breakdown phase .

冲击性负荷（如交直流电弧炉、轧机、绞车、电焊机等）大量接入电网，引起电网电压波动与闪变、三相供电不平衡以及电压电流波形畸变等，造成电网电能质量的严重恶化。

Today , more and more fluctuant loads such as electric arc furnaces , rolling mills and welding machines are connected into electric networks , which causes the fluctuation and flicker of voltage , the imbalance of three phase power supply and some other problems of electric quality .

矩阵整流器是一种真正的降压型四象限AC-DC变换器，可以用在各种三相电压供电的直流电源领域。

Matrix rectifier is a true four-quadrant buck AC-DC converter , and it is can be applied in all kind of DC power supply fields powered by three-phase mains .

单三相混合供电方式探析

Single and Three Phase Combined Power Supply Way Analysis

单三相混合供电具有经济性好、灵活性大的优点，对降损节能促进城乡用电同价有着十分重要的意义。

Composite power supply with single-phase & three-phase have any advantages to better economic gain and big agility , have a most important denotation to descend dissipated power .

三相低压供电系统零线断线及施工误接线经常造成电压偏移而导致大面积烧毁用户用电器的事故，给国家和用户造成经济损失。

Zero conductor broken and wire connection wrongly of the three-phase low pressure power supply system can cause voltage inaccurate and lead to accident of electrical apparatus are burned .

重点推导出了三相逆变器供电的主电路中点电压方程，得到了精确的电机模型，以此来完善整个调速系统。

Emphases have been put on the derivation of the equation of midpoint voltage in main circuit of three phase inverter . An exact model of the motor is obtained to perfect the timing system .

大功率可控整流电路在运行中会对电网造成严重的谐波污染问题，目前解决这一问题的主要方法是将单路三相整流供电改为Y、△双路并联整流形式。

High power controllable rectifying circuit may cause large harmonic to the whole power supply system . This problem can be solved by changing the three phase rectifying circuit from single mode to double mode with Y , Δ parallel circuit so far .

根据电加热炉恒温控制的特点和要求，本文介绍了由PLC控制、三相可控硅供电的三态高精度恒温控制系统。

Based on the characteristics and requirements of temperature control in electrical heating furnace , a tristate PLC temperature control system in which power is supplied by a three phase silicon controlled rectifier is introduced .

交流电弧炉三相不平衡供电的研究

Study on the Asymmetrical Three-Phase Power - Input of AC-EAF

单相短路试验的三相试验变压器供电

Power Supply of Three-Phase Testing Transformer for Single-Phase Short-Circuit Test

平衡电弧功率的三相电流不对称供电方法

Asymmetric Three-phase Currents Operation to Balance Three-phase Arc Powers

通过对高供低计或高供高计三相三线供电用户的二次侧电压、电流进行实时监测，分析电压、电流之间的相位关系。

The secondary voltage and secondary current of three-phase three-wire power supply are real-timely moni-tored .

实验结果表明，晶闸管三相调压供电对降低轻载电动机的能耗有明显的效果。

The experimental result shows that the thyristor three phase booster can save the energy of the light load motor obviously .

与单相V/V接线相比，易实现固定备用，提高了对牵引网和三相动力负荷供电的可靠性。

Compared with single phase V / V connection , it is easy to realize equipment backup and to improve reliability of supply for traction electric network and other three phase load .

在配电线路上采用单、三相变压器混合供电方式，以高压进户、缩短低压线路降低线损为目的，使配电线路线损有了较大幅度降低，提高了供电可靠率和电压合格率。

Apply single-phase and three-phase transformer mixed supply power manners that can lower line loss largely and improve power supply stability and voltage rate at the aim of shorten low voltage line with high voltage into users .

针对三相三线制供电系统设计了一采用DSP数字控制的并联有源滤波器。

A digitally controlled shunt active power filter based on DSP is designed for three-phase three-wire system .

实验结果证明，基于FBD法的检测方法算法简单，可以应用于不平衡三相三线制供电系统；

The experimental results show that the detection method based on the FBD method can be used in unbalanced three-phase three-wire power systems .

为了提高不平衡三相三线制供电系统的电能质量，先将基于FBD法的补偿电流检测方法进行推广，使其能够检测出三相电路中的谐波、无功及负序电流；

The power quality of three-phase , three-wire power systems is improved using a detection method based on the FBD method to measure the reactive power , harmonics and negative-sequence currents .

三相四线制供电系统的线损分算与求和法

Line Loss Calculation of Three Phase Four Wires Power Supply System

中性线在三相四线制供电系统中的作用

The role of neutral line in the three-phase and four-wire power supply system

三相四线制供电线路断线故障的分析及保护措施

Fault-line Analysis on Three-phase Four-wire System and its Prevention