在三相四线制供电系统中，中性线是非常重要的。
In the Three phase and Four wire circuit system, the neutral wire is very important.
首先，本文针对三相四线制的电流检测方法进行了研究。
First of all, current detection method for three-phase four-wire system is researched.
介绍了一种基于DSP的三相四线制系统混合型电力滤波装置。
A new DSP based hybrid power filter designed under the condition of three-phase four-wire system is presented.
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。
Especially three-phase four-wire active power filter hardware has simple structure with only three group switch device.
因此，防止三相四线制配电回路断零事故的发生，具有更广泛的意义。
So, it is significant to prevent the occurrence of faulted neutral line within the circuit of three phase and four line system.
该方法系统结构简单，不仅适用于单相电路，而且也适用于三相四线电路。
The system structure of this algorithm is simple . It not only fits for single-phase circuit, but also for three-phase circuit.
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。
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.
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。
Experimental results prove the proposed control method can compensate the harmonic, negative sequence and zero sequence current components in the three phase four wire.
通过试验验证，该检测方法能够很好的实现对三相四线制系统中的无功和谐波电流的检测。
The experimental results indicate that this method can be used to detect the reactive power and harmonic current exactly 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。
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.
另外，三相四线制有源电力滤波器能有效地抑制零线电流，并能有效地解决系统的不对称问题。
Moreover, three-phase four-wire active filters can suppress zero line current, and solve symmetric problem of system effectively.
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 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.
介绍了在三相四线制供电系统中，中线的作用，断线的危害，以及一种简单可靠的断线保护电路。
The paper introduced the effect of neutral wire the harm of open circuit and a kind of simple credible open circuit protection method.
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。
This paper offers a better theory basis for improving compensation capability of the three-phase four-wire APF controlled by hysteresis current control strategy.
然后是三相四线制无功补偿发生器的理论基础（主要是瞬时无功功率理论和IGBT脉冲产生的空间矢量法）；
Thirdly, this paper introduces academic base used in this equipment , mainly are instantaneous Var power theory and Special Vector Method for generating pulse used springing IGBT;
并在Lyapunov稳定性理论的基础上，提出了一种新的三相四线三电平中点箝位pwm整流器非线性控制方法。
Then a new nonlinear control law based on LYAPUNOV's stability theory for the PWM rectifier is presented.
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。
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.
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。
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.
本文首先论述了电能质量问题存在的普遍性和危害性，并对其中突出问题无功补偿和谐波抑制的意义作了分析，从而引出研制三相四线制静止无功发生器的重要性；
Firstly, this paper discusses universality and crisis of power quality problem and analyzes important significance of Var compensating and harmonious restrain which stand out in power system yet;
三相绕组，四线连接。
三相绕组，四线连接。
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