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Electrical automation grounding system

2021-04-07 来源: 51Due教员组 类别: Essay范文

今天51due教员组给大家带来一篇优秀的文章“Electrical automation grounding system”,这篇论文讨论了电气自动化的接地系统。近几年,电气行业非常火爆,而电气自动化技术也成为了大家工作和生活中的一部分。不过,电气技术在给人们带来便利的同时,也蕴含着一定的危险性。所以电气自动化拥有一个接地系统,这样就可以很好地确保电压的供需平衡,还可以防雷防静电等,起到了很好的保护作用。一起来看看吧 有论文需要帮忙的亲可以联系我们的专属客服微信:Even100100进行咨询喔~

Electrical automation grounding system

In the rapid development of today's electrical industry, electrical automation technology has become a social production and an integral part of life, it can significantly improve the efficiency of production and people's life. However, to play an active role in the electric automation system, but also may lead to electric shock and accidents due to improper operation and other reasons. We put high school students should be analyzed effectively in life practice in the classroom learning the content, protect their security life with knowledge.

In a number of electrical grounding system, TN-S is a relatively common type of system, mainly by adding the three-phase four-wire PE and ground to achieve the object, which in modern building electrical system has been widely used. The main characteristics of TN-S system is a ground line PE and neutral line N to ground, and the remaining two wires cannot be connected to other electrical, the PE line is not charged and neutral line is charged. In addition, this type of grounding system with more reliable, secure reference potential, just need to play its due role in the grounding system TN-CS with the same technical measures.

On the whole, TN-CS system may be divided into TN-C, and two grounding system TN-S, and the position of these two types of grounding systems interface in the junction line and N lines PE . The main characteristics of TN-S system is: before entering the household, to a ground line and a neutral line to ground the input lines, then at this time it cannot be coupled to each other with other electrical devices, so that the ground system, a large most of the neutral line are not charged, you can enhance the security of operation of electrical equipment to avoid accidents caused by electric shock. In addition, sufficient attention should also be drawn reasonable ground line to select a proper grounding resistance, in order to ensure electrical device reaches the reference position may be a predetermined value. At present, TN-CS system has been gradually promoted and applied in our country many smart buildings, smart buildings and with the further development of our country, this type of grounding is bound to be more widely used.

Based on physical knowledge to analyze, work practice, this means grounding transformer neutral grounding equipment. Must be present in the respective terminals in the distribution process, and it is mostly stored in a particular cabinet to prevent interference caused by static electricity and the like, but which cannot PE wires. In a complete high voltage power supply system, in the position of the neutral point grounded, facilitate better elimination of the ground voltage, and also help avoid the problem of zero-sequence voltage deviation occurs, thus ensuring the full voltage supply and demand Ping Heng, Especially suitable for working ground unidirectional electrical power system or a low pressure system.

Ppresent in the intelligent building fire alarm system, security monitoring systems, communications automation systems, office automation systems and closed circuit television, and many other power system involves many electrical equipment and wiring systems, and whether it is electrical equipment or wiring system, their resistance to pressure levels are relatively low, for preventing interference with relatively high requirements, particularly easy due to lightning strike caused serious damage to the overall system. Studies have shown that practice, problems due to lightning strike or counterattack string, etc., will cause serious interference problems, and associated electrical equipment will cause damage, so in the intelligent building, in order to fully ensure the smooth play to the function of the electrical system, it is necessary to make the appropriate lightning protection and grounding work, while mine to reasonably determine the structure and technology based on the actual situation, improve relevant lightning protection and grounding scheme. In fact, usually belong to an intelligent building load, the corresponding predetermined and protection measures are required to be designed according to the relevant regulations and requirements, and requires a reasonable combination with the needle incorporated in the receptor, the effective grid connection architecture roof reinforcement metal structure and construction of the apparatus. Further, when the lightning protection system is provided, to a respective lightning protection system of steel structures and grounding the outer wall of the building effectively coupled, to thereby to fully promote mine lightning protection system performance, to enhance its shielding resistance, which can effectively prevent the electrical equipment inside the building struck by lightning disasters, prevent all kinds of external electromagnetic interference caused.

With the development of information technology and automation and control technology, intelligent buildings there are often a large number of computers, automation equipment and communications equipment, electrical equipment so the receipt and transmission of information when the corresponding energy will be in different departments mutual conversion between y, and eventually converted to a control signal, a control signal corresponding logic operation and outputting information in most micro-micro current and potential, and eventually all the electrical equipment required before access to the Internet network work properly. Accordingly, in order to enhance the accuracy and stability of the system, it is necessary to ensure the accuracy and stability of power supply reference potential. Further, in the selection process lead to a large copper core as much as possible selected cross-section, and the need to ensure that it is insulated; both ends of the electronic device and needs to be connected to ground potential, respectively; the lead wires cannot be connected to the PE, but cannot be connected to the N line.

After grounding of electrical equipment, electromagnetic interference can be effectively shielded, antistatic specific measures are essentially: to connect the electrical device housing and PE line; shield grounding conductor shield requires two ends of the coupling line and PE line, and if the shield room in the building, it is necessary as many PE wires. In addition, anti-static grounding protection in electric automation also plays an important role, mainly because in a clean, dry environment, equipment or personnel will be moved due to friction and static electricity. In high humidity environments, corresponding electrostatic voltage can be tens of thousands of volts, then if the electrical device is not grounded, then it may Jihuai chip device. Thus, anti-static grounding process needs to be in a clean, dry environment space, and requires the entire housing interior devices are connected to each other and PE lines; intelligent building equipment ground resistance is generally as small as possible, but the corresponding anti Ray grounding resistance remain separate, and the resistance value typically requires less than 100 [Omega], the resistance value of the AC nodes work site needs to be below 4Ω.

The grounding connection protection scheme is performed mainly rational planning, scientific design and metal parts of electrical equipment connected by the connecting PE line electrical equipment containing no metal and the body of the electrical, especially to avoid firmly connected N and PE. For purposes of safety standards and requirements concerning the protection of ground, some of the uncharged metal equipment and accessories are often the existence of such needs, then you can consider the reasonable use of the same security measures to protect the ground. In addition, in the absence of good grounding electrical equipment safety protection work state, if there is a problem of breakdown, the casing of electrical equipment likely to appear charged, then if you touch the body charged to its shell, then there may be lead to electric shock accidents. Thus, the actual case must be set to a reasonable security grounded, while the need to reduce the grounding resistance grounding means, to ensure the security of the overall power system.

In short, the ground electronic automation systems of protection appears to be very simple, but people's lives and property and a major link, it must be caused by relevant personnel enough attention. And when we learn electrical automation knowledge, but also to fully understand and master the content of norms of electrical safety technology, a comprehensive prevention-related accidents, ensure the safety of electrical automation system operation.


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