这种理论与之前认为的对称性是健康有力的标志的理论相矛盾。
This contradicts previous beliefs that symmetry is a mark of fitness and strength.
本文首先根据系统发生三相对称短路时的短路电流，给出了三相矩形母线短路电动力的解析表达式。
The expression for short-circuit electrodynamic force of rectangular bus bars on the basis of the calculation of three-phase symmetry short-circuit current was fi.
本文对电力系统分析计算中的对称分量法进行了评述，并与相坐标法进行比较。
The widely used symmetrical coordinates method for power system analysis is reviewed and com-pared with the direct phase coordinates method.
阻尼器的对称轴线与被控机器或结构物的振动方向相垂直。
Its symmetric axis is vertical to the vibrating direction of the controlled machine or structural object.
讨论了准晶体及无公度相的对称特点。
The symmetry characters of quasiperiodic crystals and incommensurable phases were discussed.
结果表明了PWM-FCL不但可以快速有效地限制住短路电流，并且在系统发生三相不对称故障时，可以保证故障线路非故障相以及非故障线路的正常运行。
The obtained results show that the PWM-FCL can limit the fault current quickly, and the unfaulted phase(s) and unfaulted line(s) will keep stable operation state when an asymmetry fault occurs.
对面包酵母水相催化不对称还原opbe进行研究。
The asymmetric reduction of OPBE catalyzed by Baker Yeast in water medium to synthesis HPBE was investigated.
四相架空输电线路对称性好，线路及杆塔结构简单，在多相输电线路中具有独特的优势。
Because four-phase transmission system has the advantages of good symmetry and simple structure of its lines and poles, it has obvious superiority over other multi-phase power transmission system.
论述了利用瞬时无功功率理论从三相不对称电流中正确检测出三相正序有功电流，并用计算出的指令电流对系统进行补偿的原理。
Based on the instantaneous reactive power theory the method correctly detects the active positive-ord current from unsymmetrical currents and applies calculated command current to compensate system.
以基波潮流和谐波潮流的解耦性为基础，提出了一种将电力系统三相不对称基波潮流和谐波潮流分离迭代的计算方法。
Based on the decoupling of fundamental power flow and harmonic power flow, a separate iteration method for calculating three-phase asymmetrical harmonic power flow in power system is presented.
本文导出了同步电机三相对称负载突然拉开，电机端电压与励磁电流在瞬态过程中的解析表达式。
In this paper, the breaking transient formulas of terminal voltage and field current of synchronous machine with three phase symmetric load have been derived.
通过对三相异步电动机空载实验中遇见的故障——三相相间功率的极大不对称性进行分析。
Through analyzing the asymmetry about the power among three phase of the no-load experiments of the triphase asynchronous motor is designed.
利用等效电路，分析了三相异步电动机在不对称电压下的性能和对电机的危害。
By applying equivalent circuits, this paper has analyzed three-phase asynchronous motor property and the harm to generator under asymmetrical voltage.
通过构造一个虚拟的三相对称系统，该检测方法可以推广到单相电力系统的谐波电流检测。
The single-phase harmonic current components can also be detected by the method effectively through constructing a dummy symmetry three-phase power system.
这个相的选区电子衍射花样显示出准晶体结构的五次对称性。
The selected area diffraction patterns from the phase show a fivefold symmetry of a qua-sierystalline structure.
基于小波变换的分析方法，提出了基于定子三相电流之间相位对称度检测的定子绕组匝间短路故障在线检测新方法。
Based on wavelet transform, a novel on-line detection method is presented, which is based on the detection of symmetry degree among the stator three-phase line currents phases.
本文提出了分块法计算变结构电力系统非对称断相状态电气量值的新模型与新算法。
A new model and its algorithm to calculate the electric values for unsymmetrical open conductor states in power systems with variable configurations and parameters is presented.
通过三相pt对称和不对称两种情况下的计算，得到互感器三相励磁特性对铁磁谐振的影响。
Through the simulations of three phases under the conditions of PT symmetric and asymmetric, the effect of excitation characteristics of three phases' PT on ferroresonance is concluded.
实验结果表明，采用微机软件实现脉冲移相控制，可有效地改善脉冲对称度，提高整流输出电压精度。
The experimental results show that the pulse shifting phase control by using software can improve effectively the pulse symmetry and the precision of the d. c. output voltage.
通过分析低压隔爆电动机的主要故障类型，针对不对称性短路故障和断相故障提出了采用负序保护原理进行保护的方案。
Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.
对上述不对称因素的作用，利用等效电路和相量图作了定性的说明。
A qualitative explanation of the action of these asymmetries is presented by using equivalent circuits and phasor diagram.
在反馈放大电路设计时，采用数字电位器X9C503与外部按键配合，达到了A、B两相电路的对称性。
In order to ensure A phase and B phase circuits are symmetric, digital potentiometer X9C503 with exterior pressed key in the feedback amplification circuit is designed.
使用相分量方法在分析电力系统三相不对称网络时更加方便。
Phase components method may offer advantages in the analysis of unbalanced three-phase networks.
提出建立一个发生对称三相电压的动画模型，对其进行规划设计，并在微型计算机上开发实施。
A plan for designing and setting up a model of moving graph for the symmetrical three phase voltage is proposed, and it is developed and used in the microcomputer.
作为三相感应电动机单相运行的一种特殊接法，SEMIHEX连接可使三相感应电动机在单相电源上接近对称运行。
As one of the connections for three phase induction motor to operate from single phase supply, SEMIHEX connection can enable three phase induction motor have approximated symmetrical operation.
作为三相感应电动机单相运行的一种特殊接法，SEMIHEX连接可使三相感应电动机在单相电源上接近对称运行。
As one of the connections for three phase induction motor to operate from single phase supply, SEMIHEX connection can enable three phase induction motor have approximated symmetrical operation.
应用推荐