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Direct current is rejected: When the electricity owes and presses the trouble in the city, it will be too automatic to supply power disconnectedly at all that the direct current of connecting with end of direct current is rejected, direct current rejects and can provide the signal while discharging, if discharge to the terminal voltage, will change over to and prepare against the electricity to run in system, while closing to stopping discharging the voltage, the system will provide the signal of warning.

直流屏:在市电欠压或故障时,与直流端相联的直流屏就会自动毫无间断地供电,直流屏放电时会给出信号,如果放电至极限电压,系统就会转入备电运行,在接近终止放电电压时,系统将给出警示信号。

Then analyses the principle of direct current moment electromotor and builds the mathematical model and gives the block graph of transfer function and studies the PWM control strategy.

然后对直流力矩电机工作原理进行了分析,建立了直流力矩电机的数学模型,给出了直流力矩电机传递函数框图,研究了直流力矩电机的PWM控制方式。

On the basis of the conventional design means of DC side filtering equipments in HVDC transmission system, multi-object programming optimizing method with two objects: investment and operation fare and the constrain condition of equivalent interfering current limit is presented to get a generally optimum scheme for DC side filtering equipments including smoothing reactor, filters and capacitor at neutral bus in this paper.

本文基于高压直流输电系统直流侧滤波装置传统的设计方法,提出了以投资费用和年运行费用为目标、等效干扰电流满足标准要求为约束条件的多目标规划设计方法,对高压直流输电系统直流滤波装置(包括平波电抗器、直流滤波器、中性点冲击电容器)进行综合优化设计。

Based on nonliner dynamic simulation model of BLDCM.simulation model of speed and double close loops of current are built in adjusting speed system for BLDCM.Through simulation the performance of BLDCM is researched,in the way PI adjustors of speed and current adopted,fuzzy control used in speed loop and PI adjustor used in current loop,which prepares theory base for controller design of high quality BLDCM.

在直流无刷电机非线性动态仿真模型基础上建立了转速、电流双闭环直流无刷电机调速系统仿真模型,对转速、电流环均采用PI调节器及转速环采用模糊控制器、电流环采用PI调节器的直流无刷电机性能分别进行了仿真研究,为高性能直流无刷电机控制器设计提供了理论依据。

But at present the on-line monitoring technology was concentrated on AC cable, the relevant research on DC feeder cable was scarcely carried out around the world, and the on-line monitoring technology on AC cable can not be adopted. Then, in the thesis, the faults reasons were analyzed and fault models with real project were set up started with the faults of the DC feeder cable.

由于直流馈出电缆在线监测技术国内外未见报道以及交流电缆在线监测技术不能移植于直流馈出电缆在线监测的现状,论文首先从直流馈出电缆故障分析入手,分析了直流馈出电缆故障原因,建立了具有工程意义的直流馈出电缆故障模型。

For the DC leakage current could not effectively evaluate the state of DC feeder cable insulation layer with cut or crack, the discharge theory and its characteristic were studied in the DC feeder cable under special condition, and the DC discharge was proposed to detect the insulation cut or crack fault in DC feeder cable.

针对泄漏电流检测直流馈出电缆绝缘破损故障效果不佳的问题,研究了直流馈出电缆破损状态下的放电机理及特征,提出采用直流放电法检测直流馈出电缆破损故障。

Products have: NB-KR series, NBC series of carbon dioxide gas shielded welder, LGK8 Series air plasma arc cutting machine, WS Series DC argon arc welding machine, WS series IGBT inverter DC argon arc welding machine, WSE Series AC-DC pulse argon arc welding machine, ZX5 Series Thyristor rectifier arc welder, ZX6 series three-phase rectifier arc welder, ZX7 series IGBT inverter DC arc welding machine, ZXG Series rectifier arc welder, ZXE1 Series AC-DC dual-use arc welding machine, BX1 Series, BX3 series, BX6 Series AC arc welding machine, steel electroslag welding stress, pedal-style capacitor discharge spot welder, UN series of welding machine, DN Series AC Spot Welder foot, DNY Series mobile communicate spot welder, DN2 fixed pneumatic spot welding machine, D N2 fixed aerodynamic point of convex welder, CG series gas cutting machine, CNC cutting machine door, Intersection CNC EDM Series , flame brazing machine series, automatic welding machine series, MZ series automatic submerged arc welding machine, automobile manufacturing special welding equipment, robot applications, such as large family of more than 29 varieties.

生产的产品有:NB-KR系列、NBC系列二氧化碳气体保护焊机,LGK8系列空气等离子弧切割机,WS系列直流氩弧焊机,WS系列IGBT逆变直流氩弧焊机,WSE系列交直流脉冲氩弧焊机,ZX5系列晶闸管整流弧焊机,ZX6系列三相整流弧焊机,ZX7系列IGBT逆变直流弧焊机,ZXG系列硅整流弧焊机,ZXE1系列交直流两用弧焊机,BX1系列、BX3系列、BX6系列交流弧焊机,钢筋电渣压力焊机,脚踏式电容储能点焊机,UN系列对焊机,DN系列脚踏式交流点焊机,DNY系列移动式交流点焊机,DN2固定式气动点焊机,DN2固定式气动点凸焊机,CG系列气割机,门式数控切割机,数控相贯线切割机系列,火焰钎焊机系列,全自动堆焊机系列,MZ系列自动埋弧焊机,汽车制造专用焊接设备,机器人应用系统等二十九大系列百余个品种。

DC motor complex large-scale three-phase power transformer deep-trough three-phase asynchronous motor DC motor DC motor single-phase squirrel-cage induction motor.Three-phase commutator motors, single-phase motor power sub-phase squirrel-cage three-phase asynchronous electric double mine explosion-proof motor with squirrel-cage three-phase asynchronous motor rotor cup AC servo motor drives three-phase asynchronous motor principle of rotating magnetic field Generation and transmission of three-phase induction motor winding three-phase stepper motor 165mm Three-phase three-phase synchronous motor stepping motor JFB power generator rotor rectifier type AC synchronous motor DC servo motor three-phase current rotating magnetic field of teaching instrument Wound Three-phase alternator motor 160 rats of three-phase permanent magnet generator cage induction motor Synchro Motor medium-sized three-phase power transformer

直流复励电动机大型三相电力变压器三相异步深槽式电动机直流电动机直流电机单相异步鼠笼式电动机三相整流子电动机单相电动机电源分相器三相异步双槽鼠笼电机矿用防爆电动机三相异步鼠笼式电动机杯形转子交流伺服电动机三相异步电动机调速原理旋转磁场的产生与变速三相绕线式异步电动机 165mm三相步进电机三相同步电动机 JFB型硅整流发电机转子供电交流同步电机直流伺服电动机三相电流旋转磁场示教仪绕线式电动机三相交流发电机 160型永磁发电机三相鼠笼异步电动机自整角电机中型三相电力变压器

Keywords: regulated power supply of direct current; single2ch ip m icrocomputer, digital control Abstract:This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

数控直流稳压电源论文关键词:论文关键词:直流稳压电源单片机数字控制论文摘要:论文摘要:本系统以直流电压源为核心,AT89S52 单片机为主控制器,通过键盘来设置直流电源的输出电压,设置步进等级可达 0.1V,输出电压范围为 0—9.9V,最大电流为 330mA,并可由液晶屏显示实际输出电压值。

However, according to the operation of"GZB-SNQ and TSQ-GBJ HVDC project", reliability of Circuit Protection Device of domestic and international HVDC lines is not high, within easily disoperation and other issues. So how to improve reliability of HVDC transmission lines is urgently needed to solve in our country's development of HVDC.

然而根据葛上直流输电工程和天广直流输电工程的运行情况来看,目前国内外投运的直流线路继电保护装置普遍存在着可靠性不高,易误动等问题,因此如何提高直流输电线路保护的可靠性是我国发展直流输电亟待解决的问题。

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On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面,更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。

You rap, you know we are not so good at rapping, huh?

你唱吧,你也知道我们并不那么擅长说唱,对吧?