Impedance - matching balanced traction transformers ( balanced transformers in this paper for short ) are step - down transformers , they transfer symmetrical three phase voltage in primary side to perpendicular two phase voltage in secondary side . they are different from any other transformers , so their short - circuit current analysis and short - circuit test method must be taken into special account 阻抗匹配平衡牵引变压器(本文中简称平衡变压器)是一种将一次侧三相对称电压变换为二次侧二相垂直电压的降压变压器，它不同于已有的任何一种变压器，短路电流的分析计算和短路试验必须予以重新研究。
Using matiab symbolic computation , this paper studies the sensibilities of cvt ' s parameters , characteristic of cvt ' s transient noise , deduces the formula of cvt ' s secondary voltage and the formula after fourier transform ; then bring forward the least square algorithm for cvt and the compensatory algorithm based on fourier transform 本文运用matlab的符号计算，分析了cvt参数的灵敏度，其暂态噪声的特点及对保护的影响，推导了cvt二次侧电压及傅氏变换后的形式，在此基础上提出了针对cvt的最小二乘算法以及基于傅氏算法的补偿算法。
This paper presents a digital high precision signal power amplifier applied in the second winging of cvt for the high ac voltage measure in power system and analyses the intrinsic problem and disadvantage of cvt applied in power voltage measure system , based on the status in quo of cvt applied in power system 本文在基于cvt电容式电压互感器的电力系统电压测量现状的基础上，对存在的带负载问题进行了分析，提出了应用于电压互感器二次侧的一种基于dsp的数字化高精度信号放大系统。
Measurements were made of system pressure , mass flow rate of steam , air , and cooling water , temperatures of condensing flow and cooling flow , and the water level of boiler . the major phenomena observed in the present experiment are similar to those by other investigators . the mass flow rate of steam , the system pressure and air content are the most important factors affecting steam condensation 实验结果表明，维持二次侧冷却水流量不变，无论对于纯净蒸汽还是含有空气的蒸汽冷凝，随着蒸汽发生器加热功率的增大(即蒸汽流量增大) ，有效冷凝段长度将加长；当蒸汽中含有少量空气，有效冷凝段长度也会明显加长；提高系统压力，有效冷凝段长度将缩短。
With the increase of the electric power system capacity as well as the short lines , high currents will possibly occur in the transmission line when a fault happens at the end of the line . the iron core of the current transformer ( ct ) will become saturated easily because of the large current , or when the secondary load of the ct does n ' t match the 10 % error curve 随着电力系统容量增大以及短线的增加，在电力系统线路末端发生短路时，有可能出现很大的短路电流；在很大短路电流的作用下，或由于电流互感器二次侧负载与10误差曲线不匹配等原因，电流互感器铁芯很容易饱和。
The heatn0t p8rt is made up of the first nct and the second nat . by regulatng the valve of the first - net water - supply pipe , we can chmp the flux in the firstnet watersupply pipe in order to guaramee the supplied watcr ' s temperature of the second - not . in this text , according to the analysis of heat - supply condition of our country , we adopted the disttibute type and concentratc control of " suppleness cotltrol " system 世界上比较成熟的供热模式有前苏联模式和东欧模式，我国结合自己的实际国情，大部分城市集中供热系统采用仿东欧模式，整个供热系统由由热源和热网两个部分组成，热源为热电厂供热，热网部分保证热量的均匀分配，热网又分为一次网和二次网，通过调节一次网供水管的调节阀，改变一次侧的供水流量，从而保证二次侧的供水温度。
Concentric jacket pipe surrounded the test condenser . steam was generated in the boiler , flowed upward to the inlet of connection pipes , then flowed downward into the condenser tube , the cooling water flowed countercurrently through the annulus . the experiment covered the range of the pressure 1 . 0 ~ 3 . 0bar , heating power 2 . 0 ~ 15 . 0kw , steam mass flow rate 0 . 001 ~ 0 . 004kg / s , air mass flow rate 0 . 0 ~ 0 . 00163kg / s , and cooling water temperature 20 - 60 ? 在系统压力为0 . 1 0 . 3mpa ，加热功率为2 15kw ，蒸汽质量流量为0 . 001 0 . 004kg s ，空气质量流量为0 . 0 0 . 00163kg s ，二次侧冷却水温度20 60的范围内，系统研究了竖直下降管内含有空气的蒸汽冷凝特性，获得了不同压力、不同空气含量和不同加热功率下，冷凝段的温度分布和局部热流密度的数据。
The thesis analyses the effect of phase shift control and the utilization of the transformers primary sides saturable inductor to the transformers secondary sides voltage duty cycle , and basic on the buck converter s small signal ac model the converter s model is deserved , and infers control to output transfer function 论文通过分析移相控制方式和高频变压器一次侧的饱和电感对高频变压器二次侧方波电压占空比的影响，在buck变换器小型号模型的基础上建立了带饱和电感的移相控制零电压开关全桥变换器的小信号模型，推导出控制到输出的小信号传递函数。
The tap - changer is made with solid state relay as its working mechanism and controlled by microprocessor . this switch has totally cancelled the mechanical drive organization , by the microprocessor according to the voltage of second side microprocessor decide the working condition of solid state rely , high regulation speed , need not transition resistor , rush current is low . operating frequently ; there is no electric arc to produce , can put in the fuel tank of the voltage transformer directly ; the structure is simple , the fabrication cost is low , benefit and use widely among the voltages transformer of distribution 其中的有载调压分接开关，它是一种完全由固态继电器作为分接开关执行机构，由单片机控制的有载自动调压的变压器分接开关。该开关完全取消了机械传动机构，由单片机根据变压器二次侧电压的高低，决定与变压器各分接头联接的固态继电器的工作状态。调节速度快，改变分接头时不需过渡电阻，冲击电流小，可频繁操作；无电弧产生，可以直接放在变压器油箱中；结构简单，造价低，便于在配电变压器中推广使用。
Transformers can reduce the bulk of the auxiliary power considerably by magnetics integration , for the primary axial fission winding can help integrate two transformers , and series connection with balancing reactor at the primary and with low - pass filter at the secondary can help integrate several magnetics 变压器的一次绕组轴向分裂,可实现两台变压器集成;变压器的漏抗必然存在,且在一次侧与平衡电抗器串联,在二次侧与滤波电容串联,可以实现几种磁性器件的集成。因此,变压器采取磁集成技术将大大降低辅助电源的体积。
