保护设备

The misaction and nonaction of protection can bring the immeasurable loss for power plant and power system .So the fault analysis of the unit have been a problem for a long time that worker have to face. However some recorder of unit can only matriculate the waveform such as the analysis and calculate of electric parameter that the worker want to know , find the cause of fault correctly, analysis and appraise the action of protection and automechanism.

发变组作为电力系统中重要的电力设备，尤其是大型机组，同时配套有大量不同工作原理的保护，运行工况复杂，相对事故率较高，故障种类多，故障原因各异，故障的分析、判断更加困难，对机组的安全和稳定运行极其重要，保护装置的拒动或误动，都会给发电厂或电力系统带来不可估量的损失。

Urmson checks a tarp protecting the metal cage full of computers and custom electronics that serves as the sensate head of the chimeric robot, which has the body of an old Marine Corps Humvee.

这台异想天开的机器人用电脑与订做的电子设备当做头脑，装载在旧型海军陆战队「悍马」的车体上，而厄姆森正检查装载这些设备的金属外壳，看看防水布是否保护周全。

And then, the prominent problems about uncorrect action of protective relays for disturbance are discussed.

首先探讨了骚扰源的形成、特征及其传播到二次回路的途径，然后从骚扰源着手对变电站骚扰引起保护不正确动作的几个突出问题进行了研究；从敏感设备入手对保护的各个端口的抗扰度进行了研究。

And then, the prominent problems about uncorrect action of protective relays for disturbance are discussed. Furthermore, the immunity of different ports in protective device has been thoroughly studied in this desertion.

首先探讨了骚扰源的形成、特征及其传播到二次回路的途径，然后从骚扰源着手对变电站骚扰引起保护不正确动作的几个突出问题进行了研究；从敏感设备入手对保护的各个端口的抗扰度进行了研究。

The dynamical characteristics of a low voltage MicroGrid from grid-connected mode to islanded mode with different distributed generation configuration schemes are analyzed by using simulation method,and the corresponding changing laws of each DG's power,voltage and frequency of MicroGrid are obtained.

通过算例仿真研究了不同分布式电源配置方案下低压微网从并网模式向孤网模式转换的动态运行特性，获得了分布式电源的功率、微网电压和频率的变化规律。如果选择微型燃气轮机作为微网的功率支撑手段，在微网从并网向孤网过渡过程中，系统频率波动较大，且部分分布式电源有可能在低频保护动作下与电网隔离，不利于微网的稳定运行；增加储能设备后，储能设备对于微网的稳定运行可发挥重要的作用。

ABSTRACT The research of metal transfer in metal gas arc welding is of great significance for the control of arc welding process and quality, the improvement of existing welding technology and the development of new welding equipment. With the powerful aid of welding arc spectrum which contains plenty of information of metal droplet transfer, this dissertation, which mainly aims at putting forward an effective detecting method with arc spectrum signal, has inspected the spectrum of metal gas welding arc and discovered their dynamic characteristics of each kind droplet transfer mode.

熔化极气体保护焊熔滴过渡的研究，对于焊接过程及质量控制、焊接工艺方法的改进和新型焊接设备的推出都具有重要意义，而熔化极气体保护焊电弧光谱中含有丰富的反映熔滴过渡的信息。

I plant the production of welding equipment and cutting equipment SCR rectifier arc welder, SCR DC argon arc welding machine, AC arc welder, air plasma cutting machine and carbon dioxide gas shielded welder six series, more than 20 varieties.

我厂生产的焊接设备和切割设备可控硅整流弧焊机、可控硅直流氩弧焊机、交流弧焊机、空气等离子切割机和二氧化碳气体保护焊机等六大系列，二十多个品种。

The company owns a professional team of engineering technicians experienced in the research, design and development of welding equipment, complete processing and manufacturing facilities, advanced designing, testing and detecting means, specializing in the production of seven major categories, eighteen series and about one hundred models of welding equipment like various AC arc welders, DC arc welders, argon arc welders, CO2 gas welder, submerged arc welders, resistance welders and air plasma cut-off machines.

公司拥有一支多年从事焊接设备研究、设计、开发的专业工程技术人员队伍，具有完备的加工制造条件，先进的设计和试验检测手段，专业生产各类交流弧焊机、直流弧焊机、氩弧焊机、CO2气体保护焊机、埋弧焊机、电阻焊机、空气等离子切割机等七大类十八个系列近百个型号规格的焊接设备。

For Haiphong, Emerson's comprehensive PlantWeb solution includes deployment of the Ovation control system for data acquisition, as well as for monitoring and control of the sequence control system, furnace safeguard supervisory system, and electrical control system for all major plant components, including the boiler, turbine, flue gas desulphurization system and balance of plant processes.

对于Haiphong，艾默生全面的PlantWeb解决方案包括：Ovation控制系统的部署、为监测和控制的程序控制系统、熔炉保护监督系统和控制所有电厂设备的电气控制系统。这些设备包括锅炉、涡轮、废气脱硫系统和工厂平衡过程。

The equipment groove disk drive motor, electric cylinders are allocated electronic stepless transmission tune with overload protection device, simple operation, no bottle冲倒phenomenon, stable and reliable performance, easy adjustment,In full compliance with the GMP regulatory requirements, mechanical and electrical equipment can be integrated with the bottle-washing machine, a few tablets of machines, liquid filling machine, such as the composition of the various round bottle of supporting the production of automated packaging line.

本设备槽盘驱动电机，拨瓶电机均为电子无级调输并设有过载安全保护装置，操作简单，无冲倒瓶子现象，性能稳定可靠，调节方便简单，完全符合GMP规范要求，是机电一体化的设备可与洗瓶机，数粒机，液体灌装机等各种圆瓶配套组成自动包装生产联线。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。