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  • 无尘车间接地系统的种类有哪些?
    来源:http://www.hnsfk.com 浏览: 发布日期:2019-03-22
    在无尘车间消费过程中,静电所形成的危害是多方面的。首先,由于静电吸附作用,尘粒会吸附在器件和整机外表,影响产质量量,形成毛病;其次,电晕放电的能量对微电子设备会形成干扰;另外,当静电严重时可能会惹起火花放电,并可能成为易燃易爆气体、液体或粉尘及其混合物的引火源或招致爆炸。
    In the process of dust-free workshop consumption, the harm caused by static electricity is various. Firstly, due to electrostatic adsorption, dust particles will be adsorbed on the surface of devices and the whole machine, affecting the quality of production and forming defects; secondly, the energy of corona discharge will interfere with micro-electronic devices; moreover, when electrostatic is serious, it may cause spark discharge, and may become the ignition source or explosion of flammable and explosive gases, liquids or dust and their mixture.
    为了消弭静电所产生的危害,必需采取一些措施。消弭静电的办法很多,接地是消弭静电普遍、经济、烦琐、牢靠的方法。在无尘车间中,对一切会产生静电的设备都应保证牢靠接地。静电接中央式主要有硬接地和软接地。硬接地是指直接与大地电极作为导电性衔接,软接地则是经过一个限流电阻衔接到大地电极,以限制流过人体的电流不超越5mA平安值。静电接地普通有以下3品种型:
    In order to eliminate the harm caused by static electricity, some measures must be taken. There are many ways to eliminate static electricity. Grounding is the most common, economical, cumbersome and reliable way to eliminate static electricity. In a dust-free workshop, all equipment that generates static electricity should be firmly grounded. The central type of electrostatic connection mainly includes hard grounding and soft grounding. Hard grounding refers to the direct connection with the earth electrode as conductivity, while soft grounding is connected to the earth electrode through a current limiting resistance to limit the current flowing through the human body not to exceed 5mA safe value. There are three types of electrostatic grounding:
    A.直接接地。
    A. Direct grounding.
    将金属导体直接与大地停止电气衔接,使金属导体的静电电位接近或等于大地的电位。
    The metal conductor is directly connected with the earth to stop the electrical connection, so that the electrostatic potential of the metal conductor is close to or equal to the earth's potential.
    B.间接接地。
    B. Indirect grounding.
    静电压导体经过与外表全部或局部严密接触的金属导体与大地停止电气衔接。
    The electrostatic voltage conductor is electrically connected to the earth through all or part of the metal conductor in close contact with the surface.
    C.跨接接地。
    C. Straddle grounding.
    空气净化工程
    两个或两个以上互相绝缘的金属导体停止导电性电气衔接,以树立一个供电流活动的低阻抗通路,然后再停止接地。防静电接地系统依据不同请求设置接地衔接端子。在一个房间内应设置等电位的接地网格或闭合的接地铜排环。铜排截面积不应小于100mm2,防静电接地引线应从等电位的接地网格或闭合铜排环上就近接地衔接。接地引线应运用多股铜线,导线截面不应小于1.5mm2。
    Two or more insulating metal conductors stop conductive electrical connection to establish a low impedance path for current supply activity, and then stop grounding. The anti-static grounding system sets grounding connection terminals according to different requests. Equipotential grounding grid or closed grounding copper ring should be set up in a room. The cross-sectional area of copper bars should not be less than 100 mm2. The anti-static grounding leads should be connected from the equipotential grounding grid or close to the grounding ring of copper bars. Multiple copper wires should be used for grounding lead, and the conductor cross section should not be less than 1.5 mm 2.
    防静电接地系统在接入大地前应设置等电位的防静电接地基准板,从基准板上引出接地主干线,其铜导体截面积不应小于95mm,并采用绝缘屏蔽电缆。接地主干线应与设置在防静电区域内的接地网格或闭合铜排环衔接。在主要消费场所采用防静电地坪,在地坪敷设终了后,将防静电地坪内的金属线与防静电地坪所在空间的建筑柱上预留的接地端子相连。另外,接地端子须经过柱内主筋与接地极连通,以使静电经过接地端子沿柱内主筋流向接地极。
    Equipotential anti-static grounding datum board should be set before the anti-static grounding system is connected to the earth. The main grounding line should be drawn from the datum board. The cross-sectional area of copper conductor should not be less than 95 mm, and insulated shielded cable should be used. The main grounding line shall be connected with the grounding grid or closed copper ring set in the anti-static area. The anti-static floor is used in the main consumer places. After the floor is laid, the metal wires in the anti-static floor are connected with the ground terminals reserved on the building pillars in the space where the anti-static floor is located. In addition, the grounding terminal must be connected with the grounding electrode through the main bar in the column, so that the static electricity flows to the grounding electrode along the main bar in the column through the grounding terminal.
    无尘车间内不同功用的接地系统的设计均应遵照等电位联合的准绳,其中直流接地系统不能与交流接地系统混接。静电控制中的接地设计应以建筑物防雷接地为根底,各类功用接地系统包括静电屏蔽接地应处于防雷接地的维护空间,也就是必需作等电位联合。各类功用接地系统应自成系统且互相间不应混接。静电屏蔽接地系统的低阻抗电气通路应小于0.1Ψ。直流工作接地低阻抗电气通路应小于0.02Ψ。
    The design of grounding system with different functions in dust-free workshop should follow the criterion of equipotential combination, in which DC grounding system can not be mixed with AC grounding system. Grounding design in electrostatic control should be based on lightning protection grounding of buildings. All kinds of functional grounding systems, including electrostatic shielding grounding, should be in the maintenance space of lightning protection grounding, that is to say, equipotential combination is necessary. All kinds of functional grounding systems should be self-contained and should not be mixed with each other. The low impedance electrical path of the electrostatic shielded grounding system should be less than 0.1_. The DC working grounding low impedance electrical circuit should be less than 0.02_.
    电气维护接地
    Electrical Maintenance Grounding
    电气维护接地指为避免接触电压及跨步电压危害人身和设备平安而设置的微电子安装金属外壳的接地。电气维护接地采用TN-S或TN-C-S系统时,电气设备不带电的金属外露局部与电力网的接地点采用直接电气衔接。一旦呈现一相绕组因绝缘损坏而发作单相接地毛病时,经过设备外壳构成该毛病相对地线的单相短路,其接地电流(即单相短路电流)将是很大的,应用很大的短路电流,使线路上的维护安装(如熔断器、低压断路器等)疾速动作,切断电路,从而消弭人身触电风险。此外,若在毛病电路切除前的短暂时间内,一旦有人触及带电的外壳或构架时,也因接地的“相—地”回路电阻远小于人体电阻,因而,电流根本上都经过“相—地”回路,而防止人体触电的风险。
    Electrical maintenance grounding refers to the grounding of micro-electronics mounted metal housing to avoid contact voltage and step voltage endangering personal safety and equipment safety. When TN-S or TN-C-S system is used for grounding in electrical maintenance, the exposed metal parts of the electrical equipment without electricity are connected directly with the grounding points of the power grid. Once a single-phase grounding fault occurs due to insulation damage of one-phase winding, the grounding current (i.e. single-phase short-circuit current) of the single-phase grounding fault constituted by the outer shell of the equipment will be very large, so that the maintenance and installation of the line (such as fuses, low-voltage circuit breakers, etc.) can operate rapidly and cut off the circuit, thereby eliminating the risk of personal electric shock. In addition, if in the short time before the removal of the defective circuit, once someone touches the charged shell or frame, the resistance of the ground phase-to-ground circuit is much smaller than that of the human body. Therefore, the current basically passes through the phase-to-ground circuit to prevent the risk of electric shock.
    在无尘车间中,消费流水线上设备密集,且多为金属外壳的用电设备。若维护接地不到位或不契合请求,在发作接地毛病时,很容易惹起工作人员触电风险。因而,维护接地问题不容无视,无论在设计过程还是施工过程中,都应实在地做好维护接地。应停止维护接地的物体主要包括变压器、高压开关柜、配电柜、控制屏等的金属框架或外壳;固定式、携带式及挪动式用电用具的金属外壳;电力线路的金属维护管或桥架、接线盒外壳,铠装电缆外皮等。维护接地的衔接线可采用扁钢或铜导线,请求构成牢靠的电气通路。
    In the dust-free workshop, the equipment on the consumption pipeline is intensive, and most of them are electrical equipment with metal shell. If the maintenance of grounding is not in place or does not meet the requirements, it is easy to cause staff electric shock risk when grounding fault occurs. Therefore, the maintenance of grounding problem can not be ignored, whether in the design process or in the construction process, we should really do a good job in the maintenance of grounding. Maintenance of grounding objects should stop mainly including metal frames or enclosures of transformers, high-voltage switchgear, distribution cabinets, control screens, fixed, portable and movable electrical appliances, metal maintenance tubes or bridges of power lines, junction box enclosures, armored cable sheaths, etc. Flat steel or copper conductors can be used to maintain grounding connection, requesting a reliable electrical access.
    信息系统接地
    Information System Grounding
    无尘车间普通设置有综合布线系统、火灾自动报警系统、IT信息中心,信息点遍及车间及办公室,用于消费监控和管理,这就触及到信息系统的接地问题。
    Dust-free workshop generally has integrated wiring system, automatic fire alarm system, IT information center, information points throughout the workshop and office for consumption monitoring and management, which touches on the problem of information system grounding.
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