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  • 实验室的接地系统是怎么做的?
    来源:http://www.zrikatrend.com 浏览: 发布日期:2019-05-13
    实验室装修的设备接地则比拟特殊,有别于普通的设备接地,其中有一局部设备会由于谐波、高频等要素对信号采集回路干扰,构成虚假的值。常规的做法就是消谐、屏蔽、接地。由于市电里面的电源负载的不纯洁,运用综合接地系统很难实防止干扰,那么久需求一套独立的接地系统。接地电阻值也要视详细状况而定,比方普通的实验室设备对接地电阻的请求是≯4Ω,但是较为严厉的EMC实验室普通请求是不大于1Ω。高倍数的电镜对接地的请求高可达0.1Ω。
      The grounding of equipment fitted up in laboratory is special, which is different from that of common equipment. Some of the equipment will interfere with the signal acquisition circuit due to harmonic and high frequency factors, thus forming a false value. The usual way is to eliminate harmonics, shield and grounding. Because of the impurity of the power load inside the municipal power supply, it is difficult to prevent interference by using the integrated grounding system. So long, an independent grounding system is needed. The grounding resistance value also depends on the detailed conditions. For example, the request for grounding resistance of common laboratory equipment is_4, but the more stringent EMC laboratory general request is not greater than 1. The maximum requirement for grounding for high multiple electron microscopes is 0.1_.
      普通接地极的做法
      Practice of General Grounding Electrode
      做接地系统永远躲不开一项工作,即:接地极。普通的混合型接地系统的做法,是应用建筑物的地梁钢筋作为主接地极。野外设备的接地常规是在设备周边打接地桩,用一个或多个接地桩并联做环形构造,构成一个小的接地系统用于防雷接地。信号屏蔽的接地系统较为特殊,由于环形自身利于信号接纳,所以,此类接地是应用多个接地极并联并留启齿,构成一个C形构造的接地网。
      Grounding system can never avoid a job, that is, grounding pole. The common method of hybrid grounding system is to use the reinforced bar of the ground beam of the building as the main grounding electrode. The grounding routine of field equipment is to drill grounding piles around the equipment and use one or more grounding piles in parallel to form a small grounding system for lightning protection grounding. The grounding system of signal shielding is special. Because the annular grounding is good for signal acceptance, this kind of grounding is composed of a C-shaped grounding grid, which uses multiple grounding poles in parallel and retains teeth.
      接地桩的品种
      Varieties of Grounding Piles
      接地桩的品种多种多样从材质上分有热镀锌角钢的、有紫铜的、有铜包钢的、还有碳棒的。做法有用角钢打入公开做接地极的、也有做笼形,埋入公开做接地极的、也有做星型构造,埋入公开做接地极的。这些做法都是较为常见的做法,其特性主要是应用加大接触面降低接地电阻。
      There are many kinds of grounding piles, including hot-dip galvanized angle steel, copper, copper clad steel and carbon rod. In this way, angle steel can be used to penetrate into open grounding poles, cage-shaped ones, buried open grounding poles, star-shaped structures and open grounding poles. These methods are relatively common, and their characteristics are mainly the application of increasing contact surface to reduce grounding resistance.
      在此提一下较为特殊的几种接地极,日本有一种接地的做法是挖坑,然后将挖出的土搅拌一定量的碳粉、参入局部水泥以裸铜线绕入坑中,再将搅拌平均的土回填至坑中夯实浇水构成接地极。还有一种是打深井坠入远大于井深的裸铜线,使其弯曲增大与泥土的接触面,若地质条件不好则换土以保证接地电阻的阻值。
      In this paper, several special grounding poles are mentioned. One of the grounding methods in Japan is to dig a pit, then mix a certain amount of carbon powder into the excavated soil, add some cement into the pit with bare copper wire, and then fill the average soil back into the pit and compact the water to form the grounding pole. Another is to sink a deep well into a bare copper wire far greater than the depth of the well, so that it bends and enlarges the contact surface with the soil. If the geological conditions are not good, the earth will be replaced to ensure the resistance value of the grounding resistance.
    实验室装修
      为什么接地无法预算投入
      Why Grounding Can't Be Budgeted
      由于地质条件的不同,其导电率也是千差万别,而标准上给出的仅仅是不同地质条件的参考值。所以没有做好接地之前谁也无法说分明其接地电阻终能到达几。
      Because of the different geological conditions, the conductivity varies greatly, and the standard only gives the reference values of different geological conditions. So no one can tell how much the grounding resistance can reach before grounding is done well.
      特殊地质条件的不同处置方式
      Different disposal methods under special geological conditions
      很多时分当建立完成后,丈量接地电阻时经常呈现接地电阻达不到需求的值。请不要惊讶,前面曾经说过,不同的地质条件导电率是不一样的。那么,超越设计值或达不到设计值都很正常,这时分就需求相应的措施来补偿,使其终的结果到达设计指标。
      In many cases, when the establishment is completed, the grounding resistance is often not up to the required value when measuring the grounding resistance. Don't be surprised, as I said before, the conductivity is different under different geological conditions. Then, it is normal to exceed or fail to reach the design value. At this time, the corresponding measures are needed to compensate for it, so that the final result can reach the design target.
      普通的做法是在原有接地系统之外增加接地极,额外打接地桩并入原有接地系统;假如地质条件不好的话还需求换土、加降阻剂;假如地质条件极差,是岩层的话则需求由较远的中央,额外做接地极将其引来并入接地系统;假如受环境条件限制较大,比方空间不够,四周环境限制,则倡议打深井并换土处置。
      The common practice is to add the grounding pole outside the original grounding system and add additional grounding piles into the original grounding system; if the geological conditions are not good, soil change and resistance reducing agents are also needed; if the geological conditions are very poor, the rock strata need to be from a far central place, and do additional grounding poles to bring them into the grounding system; if the environmental conditions are limited, for example, space is not enough. If the surrounding environment is limited, it is advocated to drill deep wells and replace soil for disposal.
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