Based on the same ac voltage and current inputs in the back - up protection of transformer , the software module of on - line monitoring the short - circuit reactance can be added in the back - up protection device and the software flow chart are given in the paper 由于本文所提出的变压器绕组的短路电抗在线监测原理与变压器后备保护所需的交流输入量相同，讨论了在后备保护中添加变压器绕组在线监测软件的设计流程。
A variable reactance can be realized by duty ratio control . then the fcl can attain to the goal of controllable limiting fault current and controllable series compensation . first , the topology of pwm - fcl is proposed based on the analysis of others " s research 它是由一个以pwm原理控制的电感模块和一个补偿电容并联后，再与一个限流电感串联而成，改变脉冲的占空比可以得到变化的阻抗，实现限流和串联补偿。
This phenomenon informs us that when using behavior therapy on high school students in counseling , we should take some measures to avoid possible psychological reactance ; 2 ) subjects of different gender , school and grade have differences on some factors of view of human nature 人性观差异性的研究显示，男生和女生之间、不同学校的学生之间、不同年级的学生之间在人性观的一些因子上存在差异。造成这些差异的原因有待进一步的研究。
In this paper , firstly we analyse the distribution of the magnetic field in the permanent magnet canned motor pump which rate power is 15kw , and calculate the reactive electromotive force , armature reactance parameters of this motor pump with no loads and loads 本论文运用有限元方法分析了一台15kw稀土永磁同步屏蔽电泵内部磁场的分布情况，得到了在空载、负载等不同情况下，电泵的气隙磁密分布磁场，计算了反电动势和电枢反应电抗等参数。
Impedance includes resistance and capacity reactance , and this capacity and resistance are parallel connection , the simultaneous reduction of the capacity reactance and resistance will make a . c . impedance reduce more acutely , therefore the sensitivity measured by this way is improved much more 同时交流阻抗包括电阻和容抗，且电阻和电容是并联的，电阻和容抗同时减小必将使交流阻抗减小更多，所以用该方法测试的灵敏度得到了明显提高。
Two kinds of new on - line monitoring methods , which are based on measuring primary , secondary currents and voltages to calculate the short - circuit reactances of windings for detecting the deformation windings of power transformer , are proposed in the paper . the methods used for on - line measuring the short - circuit reactances of traction transformer in electric railways , are designed 本文提出了两种在线监测变压器绕组变形的方法，通过在线监测变压器绕组原、次边的电压和电流量，实时计算变压器绕组的短路电抗来判断变压器绕组变形情况，并对电气化铁路主要接线型式的牵引变压器绕组变形的在线监测方案进行了设计。
Consumers successively plunged a large number of silicon controlled commuted devices ( such as steel rolling 、 electrized locomotive 、 aluminium electrolysed devices etc ) and smelting devices to improve their produced efficiency or to save energy . on the one hand it is good for consumers , on the other hand it will arouse the fluctuation of voltage and frequency and it will result in the collision of the active and reactance capacity . meanwhile these nonlinear loads bring much harmonic into the electric network which deteriorate the quality of power supply and hazard the online device enormously 用电部门为了提高生产效益、节约能源，在大电网中相继出现了大量的可控硅整流装置（如轧钢、电气化机车、铝加工电解设备等）以及冶炼设备，这些设备的投入使用对节能有一定好处，但给电网造成有、无功冲击，引起电压和频率的波动，同时，这些非线性负荷向电网注入大量谐波，大大恶化了供电系统的电能质量，给用电设备带来了极大的危害。
It not only solves the problem of optimized control of the reactive current exchanging among branches , in other words , realizes the auto - tracking to the reactance factor , but also greatly improved the reliability of the system . to design the high voltage line wireless signal acquisition device with self - feed source , we applied electromagnet induction principle and digital communication technique 系统在优化控制技术中采用了电容器补偿控制的两段控制模型，不仅解决了分支线路之问穿越无功电流的最优控制问题，实现了功率因数的自动跟踪，而且使整个系统的可靠性大大提高。
The two key parameters , back electromotive force ( emf ) and reactance of d q axial armature reaction are investigated , too . in the process of asynchronous starting , mathematics model of repmsm is established with 1 , 2 , 0 complex number coordinate system . combined with the model , electromagnetic torque is studied 论文还研究稀土永磁同步电动机的异步起动过程，建立了稀土永磁同步电动机起动时的数学模型，并对电磁转矩的性质进行了研究，论文还提出了起动时电磁转矩的计算方法，论文对稀土永磁同步电动机的牵入同步过程进行了原理性分析，论文也对电机参数对于电机起动性能影响进行了研究。
3 . we do short circuit analysis upon multiple magnetic circuit transformers by use of steady non - linear analysis and get the leakage reactance respectively between high voltage and high voltage 、 high voltage and low voltage 、 two high voltage and low voltage 、 low voltage and high voltage and low voltage and two high voltage . what ’ s more , we do finite element analysis upon the temperature field of transformers and according to its distribution we get the wind speed to forced air cooling 3 、采用稳态非线性分析法对多磁路变压器进行短路阻抗计算,利用能量法计算出变压器高压与高压、高压与低压、两高压与低压、低压与高压以及低压与两高压之间的漏感;对变压器的温度场进行有限元分析,确定温度场分布情况。
