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通信技术英文文献3000(通信技术英文文献)

2022-08-07 06:59:38 教育 0人已围观

本文纲要目录:

1 : 关于VOIP的英文文献 3000字左右~急许~最好带翻译~谢谢

一、IP电话通信技术英文文献3000的含义
IP(InternetProtocoi)电话始于1995年,所谓IP电话,是在IP网上通过TCP/IP协议实时传送语音信息的应用。最初的IP电话技术,只是计算机对计算机的语音传输技术。双方用户都必须与因特网联网,还要具备一套IP电话软件、音频卡、麦克风和扬声器等设置,因此虽然能通话,但范围很有限,还算不上是真正的IP电话。有真正意义的IP电话出现在1996年3月,当时一家美国公司推出通信技术英文文献3000了用因特网传送国际长途电话的业务,实现通信技术英文文献3000了从普通电话机到普通电话机的IP电话。目前,IP电话已经通过网关把因特网与传统电话网联系起来,用户可以和普通电话用户一样,只要有电话机就能打因特网的国际长途电话,而通话费用远远低于国际长途电话的费用。目前IP电话从形式上可分为四种通信技术英文文献3000:PCmpC、电话一千队PC-电话、电话一电话,它的业务种类还包括IP传真(实时和存储/转发)、Web电话等业务。
二、IP电话的缺点和问题
…因特网不是实时通信网,采用分组交换方式虽然提高通信技术英文文献3000了线路利用率,但却产生了“时延”问题。“时延”是从发话人开始讲话到受话人听到讲话所经过的时间。时延超过了限度会使人感到不自然,一般来说,时延超过了250m8,就会感到难于忍受。传统的电话通信通话人是觉察不出时延的。而IP电话要把通话人说话的声音信号变换为数字的编码信号,要把数字化的信号“分组”、打“包”,还要用“存储一转发”的方式传送通信技术英文文献3000;在接收端还要解码、合成、复原等等,因此增加了很多时延(例如编、解码的时延、缓存的时延等)。如果遇到电路拥挤的情况,等待转发可能导致很长的时延,甚至还会造成数据分组丢失,使收话人听不清或听不懂发话人的说话。1999年中国电信在全国25个城市进行IP电话试验,其基本定位是电话语音业务,专门为通话设计,在接通率和通话质量上比利用电脑上网的IP电话有明显改善,目前还在试验之中。
三、IP电话的发展
…因特网是计算机互联网,早期的IP电话技术研究主要是集中在计算机和计算机网络上通电话的问题。而现在的研究主要是解决与电话网相结合的问题。这是因为电话网仍然是世界上最大、分布最厂、用户最多的通信网。最近几年,计算机的用户虽然迅速增多,但是比电话用户还是少得多。即使是在发达国家,电话用户也比计算机用户多好几倍。如果只是因特网上的计算机用户能使用IP电话,使用的范围就会受到很大的限制。要扩大IP电话的使用范围,使普通电话用户也以使用IP电话,就需要与电话网相结合起来。把电话网与因特网连接起来的主要设备是话音网关,目前已经有许多大的电话交换机厂商研制了多种新产
…IP电话迅速发展,甚至有人估计“在2000年前,国际长途电话将全面通过因特网进行”。虽然这种估计未免过份,但是IP电话的出现,确实使传统的电话业务受到因特网电话日益剧增的影响。
IP的不同凡响
一、IP电话为什么能节省电话费用
…IP电话发展迅速、受到人们关注的主要原因是IP电话能大量节省打长途电话的费用,尤其是打国际长途电话时更为显著。它可以比普通的长途电话节省很多费用是因为普通的长途电话是通过电话网传送的,而IP电话是利用因特网传送的。电话网和因特网的传送有很大的区别(主要的区别如附表所示)。附表电话网和因特网传送的区别
处理信号 模拟语言信号 数字数据信号
传输方式 电路交换 分组交换
计费方式 按通话次数、时间、距离计费 按期付费(如按月付费)、按接入速率
组织管理 有成套的组织和管理 目前尚无
…——电话网是为电话通信而建设的,为了通电话建设了大量电话线路和无线信道,需要一系列交换设备、传输设备和中继设备,以及相应的运营维护组织和设施,因此电话通信的的成本费用高。计费的方式是按打电话的次数、通话距离的远近和通话时间的长短计算的。因特网是计算机的互联网络,原本是由国家资助而建立的学术性网络,联网使用是免费的。1995年才过渡成为商业性质的因特网,联网需要收费,但仍含有一些公益的性质,收费比较低。计费的方式是按期(例如按月)、按接入速率收取费用的。
…——从传输技术来说,电话网是采用电路交换方式,即电话通信的电路一旦接通后,电话用户就占用了一个信道,无论用户是否在讲话,只要用户不挂断,信道就一直被占用着。一般情况下,通话双方总是一方在讲话,另一方在听,听的一方没有讲话也占用着信道,而且讲话过程中也总会有停顿的时间。因此用电路交换方式时线路利用率很低,至少有50%以上的时间彼浪费掉。而因特网的信息传送是采用分组交换方式,所谓分组交换,是把数字化的信息。按一定的长度“分组”、打“包”;每个“包”加上地址标识和控制信息,在网络中以“存储一转发“的方式传送,即遇到电路有穷就传送,并不占用固定的电路或信道,因此被称为是“无连接”的方式。这种方式可以在一个信道上提供多条信息通路;此外在因特网上传送信息通常还采用数据压缩技术,被压缩的语音信息分组在到达目的地后再复原、合成为原来的语音信号送到接收端用户。因此,利用因特网传送语音信息要比电话网传送语音的线路利用率提高许多倍,这也是电话费用大大降低的重要原因。
二、IP电话的特点
IP电话指在互联网上通过TCP/IP协议实时传送语音信息的应用,即网络电话。
…IP电话始于1995年,最初它只用于计算机之间的话音传输。通话双方须联入互联网,还须配备相应软件和多媒体设备才能通话。真正意义的仟电话出现于1996年3月,它通过网关将互联网与电话网结合起来,使用户能实现普通电话机间的通话。
…IP电话是通过互联网进行传输,所以占用资源小,成本较普通的长途电话更低,尤其在打国际长途电话时更为显著。其费用标准为:国内长途0.30无/分钟;国际长途4.8元/分钟;港奥台2.5元/分钟。另外,还要加收由于使用IP电话所产生的本地接入费用。
…目前IP电话的通话质量还不尽人意,会出现语音不清晰、掉话、时延、回音等情况。但随着互联网连接速率的提高和技术上的改进,其语音质量会得到进一步的改善。
…目前信息产业部己本着积极试验,适时开放、规范管理的原则,批准了中国电信、中国联通、中国吉通等几家公司进行IP电话的试验,各个公司将陆续推出主叫IP电话和IP电话卡业务。
…IP电话卡分为记帐卡(A类)、预付卡(B类)、储金卡(C类)三种。目前试验开放的是储金卡。每张卡上有不同的面值,并规定了使用期限,每打完一次电话,话费将自动扣减,扣完即止。
…IP电话的使用方法与目前的200、300电话卡相似,即用户购买了IP电话卡后,就可得到一个私人账号和密码,使用时,在任何一部双音频电话上拨打该公司的IP接入号码,然后根据语音提示,输入私人账号及密码,再拨人被叫号码即可。
…总之,IP电话是技术进步的产物,它在目前通信领域中极具发展潜力。相信随着技术的更新的市场的规范,它的前景会越来越好!

2 : 与《智能楼宇安防系统集成化的设计与研究》这一论文有关的英文文献,3000个单词以上,最好有中文翻译

中文如下(你可以根据下面的英文翻译然后自己选取其中的段落哦,希望这个可以帮助到你~~)
【中国安防网】众所周知,智能楼宇技术包括通信网络技术、计算机技术、自动控制技术、消防与安全防范技术、声频与视频应用技术、综合布线和系统集成技术。它是现代建筑技术、通信技术、计算机技术、控制技术等相互结合、互相渗透的产物,集中体现了当今信息社会的信息特征。
确切的说它是楼宇自动化系统(BAS:BuildingAutomationSystem)、通信自动化系统(CAS:CommunicationAutomationSystem)和办公自动化系统(OAS:OfficeAutomationSystem)三者的有机结合,其中建筑环境是智能大厦支持平台。也就是通常所说的3A系统,但从国际和国内实际情况来看,消防自动化系统(FAS:FireAutomationSystem)和安全防范自动化系统SAS(SafetyAutomationSystem)都是由专门机构负责的,有着比其它系统更加严格的管理和验收程序,因此FAS和SAS也被列入智能楼宇子系统,由3A变成5A。其实无论3A,5A或xA,多少个A其实并不十分重要,无非是一个系统划分归类的问题,重要的是,智能楼宇里面的功能是否得以完美地实现。
智能楼宇的根本目的应该是:使复杂问题简单化,使楼宇功能多样化,使物业运作安全可靠化,使生活环境舒适化以及系统高度的智能化和节能化。因此,实现安全防范是智能楼宇中非常重要的一部分,安全防范自动化程度的先进性也严重影响着智能楼宇的整体水平。二、智能楼宇对安全防范系统的要求由于智能楼宇的大型化、自动化、高层次化,使得其安全防范系统显得更加必不可少。
对安全防范系统的主要要求是:
1)防范:防患于未然是该系统的主要要求,无论对人还是对财务,防范都是必须放在首位的。
2)报警:当发现安全受到威胁或破坏时,系统应能够及时报警。
3)监视:系统应能够对楼宇中需要监视的地方进行24小时的不间断监视,并保存一定时间段的监视记录。
4)记录:当发生报警或其它紧急情况时,系统应能够迅速的把报警区域的环境、声音、图像等数据及时记录下来,以备查验。
5)系统本身应具有防破坏功能:当系统内一些关键设备或线路遭到破坏时,系统应能够主动报警。
6)自检功能:系统应能够进行不定期的自检,并能够具有消除误报、漏报功能。三、智能楼宇中的安全防范系统安全防范系统在智能楼宇中一般涉及出入口管理、停车场管理、巡更管理、周界管理、楼宇对讲、CCTV和住户内部安全管理等几个子系统,涉及电学、声学、光学、通信学、数字信号处理、自动控制等多个学科和领域,是比较复杂的综合性技术,本文就这些技术在安全防范系统中目前应用的现状及其发展趋势进行论述,不对每个子系统再作专门的介绍。
3.1安全防范系统的基本构成*信号检测:主要是完成各种报警信号的信号检测或呼叫;*信号应答:主要是完成各种检测器的正常复位或信息的应答;*信息前处理:主要是完成对各种检测信号的前期信息处理,使之能够通过合理的方式传送到控制中心;或将控制中心的信息转换成应答信号送出;*控制中心:是整个系统的心脏,负责调度和协调各个任务,并具备联网、自检功能;*报警处理:将报警信息通过所设置的手段发送出去;*信息后处理:对各种有用信息进行处理,以备查验或留取记录。
安全防范技术的现状
信号检测技术在智能楼宇中的信号检测技术目前应用的主要是信号探测技术,也就是通常所说的传感器类技术,是用来探测入侵者移动或者其它动作的电子及机械部件,它通常将压力、震动、声音、光等转换成相应的电信号,在经过放大、滤波、整形等处理,使其成为易于传输的数字或模拟信号。目前常用的传感器主要有开关报警器、震动报警器、超声波、次声波报警器、红外报警器、微波报警器、激光报警器、烟感报警器和温度报警器等。这些报警器采用的是比较成熟和普通的技术,它们的集成度一般比较低,采取的工作方式一般有主动和被动两种方式,主动报警器在工作时,报警器一直向需要报警的区域连续的发出信号,经反射或直射或其它方式在报警器上形成稳定的信号,当报警控制区域内有异常情况时,报警器上的信号发生变化,根据信号变化的情况产生报警信号。被动方式报警时,它依靠被测物体自身存在的能量变化进行检测,报警器工作时不需要向探测现场发送任何信号,当异常情况出现时,一直稳定的信号出现变化,报警器根据信号变化的情况产生报警信号。在信号回应处理部分,它根据控制管理中心发来的信号对现场实行自动保护,更多采用的是自动机械控制技术。
【 China security nets 】 as is known to all, the intelligent building technology including the communication network technology, computer technology, automatic control technology, fire and safety technology, audio and video application technology, integrated wiring and system integration technology. It is the modern architectural technology and communication technology, the computer technology, control technology, combination of the product, mutual penetration, and embodies the characteristics of the information society nowadays information.
The exact says it is building automation system (BAS: BuildingAutomationSystem), communication automation system (CAS: CommunicationAutomationSystem) and office automation system (OAS: organic combination of the three OfficeAutomationSystem), including building environment is intelligent building support platform. Be also usually say triple-a system, but from the international and domestic actual situation, the fire-fighting automation system (FAS: FireAutomationSystem) and safety automation system SafetyAutomationSystem) are SAS (by special agencies responsible than other system, a more strict management and acceptance procedures, therefore FAS and SAS was added to the intelligent building subsystem, the triple-a into 5A. Actually regardless of triple-a, 5A or xA, how many A actually not very important, is nothing but A system is divided, important classified, the function of intelligent building inside whether be perfect to achieve.
The basic purpose of intelligent building should be: make complex problem is simplified, make the building function diversified, make property, safe and reliable operation of living environment comfortable personalized intelligent and highly and system energy conservation. Therefore, realizing safety precautions are intelligent buildings, a very important part of the advanced security automation degree also affects the overall level of intelligent building. Second, the intelligent building safe guard system requirements for the large-scale, due to the intelligent building automation, high hierarchical, to make it safe guard system appears more indispensable.
On the main safe guard system requirements are:
1) prevent: to prevent the main requirements is the system, whether for people or financial, prevention is always in the first place.
2) alarm: when discovery of safety and security has been threatened or destroy, the system should be able to give an alarm.
3) surveillance: system should be able to place on the buildings need to monitor the uninterrupted round-the-clock monitoring and, save certain time monitoring records.
4) records: when that happens alarm or other emergency, the system should be able to quickly take alarm regional environment, sound and image data timely recording, for examination.
5) system itself should have defending breakage function: when the system of some key device or circuit in damage, the system should be able to active alarm.
6) self-check function: system should be able to perform, and not regularly self-inspection capable eliminate misstatement, omission function. Third, the security guard system in intelligent building safe guard system in intelligent buildings generally involve gateway management, parking management, petrol management, perimeter management, building interphone, CCTV and resident internal security management and so on several subsystems, involving electrical, acoustics, optical, communication science, digital signal processing, automatic control and so on multiple disciplines and fields, is more complicated comprehensive technology, the paper these techniques in safe guard system of present application status and trend is discussed, the wrong done special again each subsystem are introduced.
3.1 safe guard system the basic constitution * signal detection: mainly in completing various alarm signal detection of signal or call; * signal response: mainly is the normal reset finish all kinds of detector response; or information * information pretreatment: basically be complete to various testing signals that the information processing, through rational way to teleport to control center; Or will the control center of information convert response signals sent out; * control center: is the heart of the whole system, be responsible for scheduling and coordinate various tasks, and possess networking, self-check function; * alarm treatment: will alarm information through the means of installed by sending out; * information of all kinds of useful information post-processing: process for inspection or return records.
Security preventation technology of the status quo
Signal detection technology in the intelligent building.then currently used for signal detection technology are mainly the signal detection technology, commonly known as sensor class technology, is used to detect intruders mobile or other action electronic and mechanical components, it will normally pressure, vibration, sound, light, etc, converted into electrical signals in amplified, filtering, plastic processing, makes it easy to transmit digital or analog signals. Now commonly used sensors are mainly switch alarm, vibration alarm, ultrasonic, infrared alarm device alarm, and microwave alarm, laser alarm, smoke alarm and temperature alarm and etc. These alarm USES is relatively mature and common technology, their integration is compared commonly low, take way of working generally have active and passive two ways and active alarm at work, the alarm straight to the need for the area of alarm signal, the reflection or point-blank or other means is formed on the alarm when the alarm signal, stable control area is an excrescent circumstance, alarm the signal on the changes, according to signal the changed circumstances have a warning signal. Passive way of alarm, it depends on the object's own existence by the energy changes when testing, alarm work doesn't need to send any signal detection scene, when an exception occurs, signs of change has been stable, alarm signal to changing circumstances have a warning signal. In signal processing parts, it respond according to control management center of site shall be the signal from the automatic protection, more automatic mechanical control technology is.

3 : 求一篇关于电气自动化的中英文的科技文献的,大约3000字左右

摘要:本文主要介绍通信技术英文文献3000了近年来电气自动化技术通信技术英文文献3000的发展,以及应用的概况。电气自动化技术尽管已经广泛应用与通信技术英文文献3000我国国民生产的各个部门和领域,但它仍需要不断革新,不断发展。
关键词:电气自动化;发展;应用一、发展概况
伴随着我国的电力电子技术、微电子技术的飞速发展,电气自动化的概念已经走出通信技术英文文献3000了工厂,并在交通、农业、建筑、办公场所等方面得到了广泛的应用,电气自动化技术作为从电气工程技术发展出来的并与电子与信息技术紧密结合起来的一门电气工程应用技术学科,历经了近一个世纪的发展,电气自动化技术已走过了从无到有、从发展到成熟的过程。而我国电气自动化的研究工作可以追溯到上世纪的五十年代,可以说研究的时间不短,但是它依旧焕发着生气与活力。下文就来简述一下我国电气自动化的发展历程:
(一)全空型的电力电子开关。于上世纪五十年代晶闸管出现了,它标志着运动控制的新纪元。尽管它是第一代电子电力器件,但仍被沿用至今。随后交流变频技术出现后相继有出现了全控制式器件如GTR等。这是电力电子器件的第二代;接下来是IGBT和MGT这一类复合型电力电子器件可以称为第三代器件。最后是功率集成电路,PIC即第四代电力电子器件。
(二)由低频向高频方向发展的电路。不断更新的电力电子器件势必要引发变换器电路的换代。
当应用于普通晶闸管时,直流传动的变换器主要是整流相互控制,交流变频传动则是交—直—交变频器。当电力电子器件转换到第二代的时候,PWM变换器采用的相应也要多些。因为采用了PWM变换器之后不仅提高了功效,并且能够减少高次谐波对电网的影响,合理解决了电动机在低频区的转矩脉动问题。随着应用的深入,PWM也存在着诸多缺陷,因此也就有了谐振式直流逆变器电路的发展。
(三)交流调速控制理论。交流电机磁场定向远离市由德国学者F·Blaschke所提出来的,这一理论的提出为交流传动高性能控制奠定了深刻的理论基础。但通信技术英文文献3000他提出的这个思想远不能够达到理论的操控效果。于是事隔14年后于1985年德国鲁德大学的Depenbrock教授又提出了直接转矩控制的思想,紧接着有将它推放到了弱磁调速的范围内。可以说他的这一控制思想新颖,控制结构简单明了,信号处理的物理概念明确,是一种高静动态性能的新型交流调速方法。
(四)通用变频器的投入使用。通用变频器:系列化、批量化、占市场量最大的中小功率变频器。先后变频器经历了第一代:普通功能型U/F控制型;第二代:高功能型U/F型;第三代:高动态性能适量控制型。
(五)单片机的发展。占主导地位的MCS-51的8位机虽占主导地位,但是它的功能还比较简单,指令集短小,因此就有了适合大批量生产的PIC系列单片机的推广使用,它不仅具有很高的可靠性,而且保密性高。
二、电气自动化的应用
(一)建筑中的应用。智能化建筑势必要引入电气自动化的成分,随着我国国民经济的飞速发展以及数字电子化科技发展,无疑,高档智能化建筑已经成为了当今建筑界的主流方向。为了达到设备的合理利用,三明的人力的节省就有了建筑设备的自动化控制系统。例如:在建筑物供配电设计中,接地系统没计占有重要的地位,因为它关系到供电系统的可靠性,安全性。IN—S是一个三相四线J/NPE线的接地系统。通常建筑物内设有独立变配电所时进线采用该系统。TN—s系统的特点是,中性线N与保护接地线PE除在变压器中性点共同接地外,两线不再有任何的电气连接。中性线N是带电的,而PE线不带电。该接地系统完全具备安全和可靠的基准电位。只要像TN—C—S接地系统,采取同样的技术措施,TN—S系统可以用作智能建筑物的接地系统。智能建筑应没置电子设备的直流接地,交流工作接地,安全保护接地及普通建筑也应具备的防雷保护接地。
智能化建筑内有大量的电子设备与布线系统,如通信自动化系统,火灾报警及消防联动控制系统,楼宇自动化系统,保安监控系统,办公自动化系统,闭路电视系统等,以及他们相应的布线系统。这些电子设备及布线系统一般均属于耐压等级低,防干扰要求高,最怕受到雷击的部分。建立严密,完整的防雷结构。智能建筑多属于一级负荷,应按一级防雷建筑物的保护措施设计,组成具有多层屏蔽的笼形防雷体系。
(二)应用于净化空调设备。净化空调系统控制自动监控装置,可设计成单个系统的测量、控制系统,也可设计成数字计算机控制管理系统。
对温度的控制。净化空凋系统采用DDC控制。装设在回风管(回风温度近似于洁净室温度)的温度传感器所检测的温度送往DX一9100,与设定点相比较,用比例加积分加微分运算进行控制,输出相应电压信号,控制加热电动调节阀或冷水电动调节阀的动作,控制回风温度保持在18"12—26‘℃之间,使洁净室温度符合GMP要求。对湿度的控制。装设在同风管(回风湿度近似丁洁净室湿度)内的湿度传感器所检测的湿度,送往控制器与设定湿度相比较,用比例加积分运算控制,输出电JK信号,控制蒸汽电动调节阀的动作,控制回风湿度保持在45%.65%,使洁净室湿度以满足GMP要求。
电气自动化技术尽管已经广泛应用与我国国民生产的各个部门和领域,但它仍需要不断革新,不断发展。
Abstract: This paper introduces the recent development of electrical automation technology, and application profiles. Although electrical automation technology has been widely used in various sectors of our national production and areas, but it still requires constant innovation, continuous development.
Key words: electrical automation; development; applications I. Development Overview
Along with China's power electronics technology, the rapid development of microelectronics technology, electrical automation concept has been out of the factory, and in transportation, agriculture, construction, office space and other aspects of a wide range of applications, electrical automation technology as the electrical engineering from the developed and closely with the electronics and information technology to combine an electrical engineering technology disciplines, after nearly a century, electrical automation technology has come a scratch, from development to mature. The electrical automation of research can be traced back to the fifties of the last century can be said of the time a lot, but it still glow with vitality and energy. To describe briefly below to the course of development of electrical automation:
(A) all air-based power electronic switches. Thyristor in the fifties of last century there, it marks a new era of motion control. Although it is the first generation of electronic power devices, but was still in use. AC variable frequency technology appears then there have appeared a full-control devices, such as GTR and so on. This is the second generation of power electronic devices; followed this type of IGBT and MGT hybrid power electronic devices can be called third-generation devices. Finally, power integrated circuits, PIC is the fourth generation of power electronic devices.
(B) the direction of low frequency to high frequency circuits. Constantly updated to power electronic devices will inevitably lead to the replacement converter circuit.
When applied to a thyristor, the DC transmission between the converter is mainly controlled rectifier, AC variable frequency drive is AC - DC - AC inverter. When the power switch to the second generation of electronic devices, when, PWM converters have adopted more appropriate. After using the PWM converter because not only improve the efficiency and to reduce the high harmonics of the grid and reasonable solution to the motor torque ripple in the low frequency problem. With the application of in-depth, PWM also has many defects, so DC will have a resonant inverter circuit development.
(C) AC speed control theory. AC motor field oriented away from the city by the German scholar F · Blaschke made out, this theory put forward for the AC drive for high performance has laid a profound theoretical basis. However, he proposed this idea is far from control theory to achieve results. So 14 years later in Germany in 1985 after the University of Depenbrock Professor Rood also proposed the idea of direct torque control, followed by a push it into the field weakening speed range. It can be said that control thought his novel control structure is simple, clear physical concept of signal processing, static and dynamic properties of a new type of high speed communication methods.
(D) Common drive in use. Universal Converter: serialization and batch, the largest market share of small and medium-power inverter. The first generation drive has gone through: common functional U / F control type; second generation: high-functional U / F type; the third generation: amount of controlled high dynamic performance.
(E) the development of SCM. Dominant MCS-51 8-bit machines, although the dominant, but its function is still relatively simple, short set of instructions, hence suitable for mass production of the PIC MCU promote the use of, it not only has high reliability and high security.
Second, the Electric Automation
(A) Buildings. Intelligent building automation is bound to bring in electrical components, along with the rapid development of China's national economy and the development of digital electronic technology, no doubt, high-end intelligent building has become the mainstream of today's construction industry. In order to achieve rational use of equipment, manpower saving in Sanming have a building automation control system equipment. For example: In the design of buildings for power distribution, grounding system plays an important role not count, because it relates to the power supply system reliability, security. IN-S is a three-phase four-wire J / NPE line grounding system. Usually buildings are equipped with separate substation into the line when using the system. TN-s system is characterized by the neutral and protective earth line PE N addition to the common grounding transformer neutral point, the two lines no longer have any electrical connections. Neutral line N is live, and PE line is not charged. The grounding system is fully equipped with safe and reliable reference potential. As long as the TN-C-S earthing system, adopt the same technical measures, TN-S system can be used as a smart building grounding system. Intelligent building should not set the DC grounding electronic equipment, exchange of ground, ground and general building security should have the lightning protection grounding.
Intelligent building, a large number of electronic devices and wiring systems, such as communications automation systems, fire alarm and fire control systems, building automation systems, security monitoring systems, office automation systems, CCTV systems, as well as their corresponding wiring system. The electronic equipment and cabling system voltage levels are generally lower for high anti-interference, fear by the lightning part. The establishment of strict and complete the mine structure. Intelligent Building is a multi-load, should be a lightning protection design of buildings to form a multi-layer shielding cage lightning protection system.
(B) applies to clean air conditioning equipment. Air conditioning system controls automatic monitoring device can be designed into a single system of measurement, control systems, can also be designed into digital computer-controlled management system.
Temperature control. Gas purification system using DDC control wither. Installed in return air duct (return air temperature is similar to the clean room temperature) The temperature detected by temperature sensor sent a DX 9100, compared with the set point with proportional plus integral plus derivative control operation, the output corresponding voltage signal, electric control valve controlling the heating or cold water electric control valve movement and control the return air temperature maintained at 18 "12-26 '℃ between the clean room temperature meet GMP requirements. of humidity control. installed in the same duct (return Approximate Jie Ding cleanroom air humidity humidity) sensors detect the humidity within the humidity, sent to the controller and set the humidity compared to the control with proportional plus integral operation, the output JK signals to control the action of steam electric control valve to control back wind and humidity kept at 45% .65%, so the clean room to meet the GMP requirements and humidity.
Although electrical automation technology has been widely used in various sectors of our national production and areas, but it still requires constant innovation, continuous development.