主要介绍一种依据一台三相异步电动机在S1工作制下的运行参数推断该台异步电动机容量不变时在S7工作制下发热情况的方法。
Based on operation parameters of a three phase induction motor at duty type S1, this paper deduces the thermal state of this motor with constant output at duty type S7.
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.
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.
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.
注：每一块面板清晰显示三相五线制电源的母线、支线。
Remark: every wire of the three-phase five-wire system is clearly indicated on the front panel.
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.
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.
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.
介绍了三相三线制混合型有源电力滤波器在变频调速电动机谐波治理和无功补偿方面的运行情况。
The operating status of three-phase three-wire HAPF(Hybrid Active Power Filter) in harmonic suppression and reactive power compensation for variable-frequency motor are introduced.
研究了不同冻制方法对水三相点趋稳定的过渡时间的影响。
The influence of different freezing methods on stabilizing transient time of the three-phase point of water is investigated.
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.
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.
本文首先给出了三相三线制并联型有源电力滤波器的系统构成以及工作原理。
Firstly, this thesis has presented the system structure and operation principles of three-phase three-wire parallel APF.
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.
整个三相铁芯由三条曲线硅钢带料卷制而成，中间无气隙及接缝，油箱采用低损耗、低激磁电流、低噪声等特点。
Whole three-phase core is made of three curved silicon steel belt material through rolling, without clearance and seam. The tank has features of low loss, low exciting current, low noise and others.
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.
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.
提出了一种适用于三相三线制不平衡系统的任意次谐波电流检测方法。
This dynamic voltage regulator employs a two-leg inverter for three-phase three-wire systems.
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;
提出了一种适用于三相三线制不平衡系统的任意次谐波电流检测方法。
A new detection method for random harmonic current which was suitable for 3-wire and 3-phase unbalance system was put forward.
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;
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;
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