查询词典 phase transformer

Unladen state generator, step-up from zero after the check check each group voltage transformer secondary voltage value, phase sequence and instrument instruction correctness check value and protection actions return values, taking no-load of generators, power generation Inter-turn machine stator winding insulation pressure.

发电机空载状态下，零起升压后检查检查各组电压互感器二次电压值、相序及仪表指示正确性，检查保护动作值和返回值，录取发电机空载特性，进行发电机定子绕组匝间绝缘耐压。

In the fourth chapter, using the magnetic vector potential as the unknown variable, a mathematical model for numerical calculation of the magnetic field and loss distribution in 3-phase 5-limb transformer core is presented.

第三章针对变压器铁心结构的特点，对各向异性非线性边值问题的有限元分析方法进行了详细的阐述，并推导出了实用的N-R格式及单元分析格式，对具有多媒质单元的有限元分析方法进行了介绍，为变压器铁心磁场及损耗分布的数值计算奠定了基础。

A phase-shifted controlling PWM DC/DC full bridge converter with softswitching is proposed and used to realize a constant current power of20A(5～48V).This full bridge converter utilizes the transformer leakageinductance(or the resonant inductance in series with transformersprimary)and the autoecious capacitance of MOSFET to achieveZVS(Zero-Voltage-Switching),as a result it can decrease the switchingwaste,increase the switching frequency,and diminish the power bulk.

本文使用一种通过移相控制进行脉宽调制的软开关全桥变换器来实现20A(5～48V)恒流源，这种全桥变换器利用变压器的漏感、原边串联谐振电感和功率管的寄生电容来实现开关管的零电压开通，降低了开关损耗，提高了开关频率，减小了电源体积。

Therefore, the authors present the lateral comparison approach, i.e., tocompare the three-phase spectrograms of the same transformer or the cophasal spectrogramsof the same type transformers.

对此，提出了横向比较法的变压器绕组变形测试，即对同一台变压器的三相图谱，或同型号变压器的同一相别图谱进行比较，以此判断变压器是否存在绕组变形。

These rugged, flexible melters are available in several different versions, including 8-hose expansion base, the transformer option for 3-phase 400/480 volt installations and automatic filling systems.

这些坚固的，灵活的热熔胶机可在几个不同的版本，其中包括8管扩张的基地，3变压器的选择相400/480和自动灌装系统电压装置。

The S11-M series three-phase oil immersed distribution transformer belongs to state high-tech new product,it is developed based on new type S9 series product's mechanism design,the design idea is mainly aimed at heightening product's reliability and performance,design reportedly adjusts some coefficient of losses and mechanism according to new S9 product,so as to have loss deigns up to measured value;meanwhile,the optimizing design properly,fix ratio of cooper to iron,in order to decrease material cost and have structure more proper.

S11-M型系列三相油浸配电变压器是国家科技新产品，在新型S9系列产品结构设计的基础上进行开发的。设计的主导思想是满足产品的可靠性，提高产品的性能，设计中根据新S9产品的实际情况，重新调整了一些损耗系数及结构，使损耗设计值更符合实侧值；同时进行了优化设计，合理确定铜铁比例，使材料成本最低，结构也更合理。

Three-core bundle insulation conductors by which the secondary winding of a single-phase distribution transformer connected to the loads were designed for remote areas where the loads are small and dispersive. It consists of two lines and one neutral and is separated from each other by insolating materials.

三芯绝缘导线束是针对我国农村偏远地区用电负荷少、分散、损失率高的现状，采用低压侧中间抽头的单相配电变压器两火一零供电模式配套而研究和设计的一种新线材。

In addition,the phase compensation of the transformer was meliorated significantly.

此外对电流互感器的相位补偿也有了很大的改善。

The long-term unbalance of the three-phase direct-current electric resistance of the coal mine substation host transformer,has led to grave product of tap changer charcoal,insulation oil flash point reduces,threatens the safe operation.

煤矿变电所主变压器由于长期三相直流电阻不平衡，导致分接开关严重积炭，绝缘油闪点降低，危胁主变压器安全运行。

Especially, it pointed out that the design of modern steel-making electric arc furnace short net should base on three-phase balance, delta connection should be implemented inside the transformer, the section of conductor should be selected according to the density of economy electric current and the number of connected points of short net should be reduced.

围绕现代电弧炉供电及工艺方面的改进，提出短网设计与改造要点，特别指出：现代炼钢电弧炉短网的设计要以三相平衡为主，变压器的二次出线三角形封口要在变压器内实施，短网导体截面要按经济电流密度选取，以及尽量减少短网导体联接处。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐