1、 1 英文翻译 A comprehensive overview of substations Along with the economic development and the modern industry developments of quick rising, the design of the power supply system become more and more completely and system. Because the quickly increase electricity of factories, it also increases serious
2、ly to the dependable index of the economic condition, power supply in quantity. Therefore they need the higher and more perfect request to the power supply. Whether Design reasonable, not only affect directly the base investment and circulate the expenses with have the metal depletion in colour meta
3、l, but also will reflect the dependable in power supply and the safe in many facts. In a word, it is close with the economic performance and the safety of the people. The substation is an importance part of the electric power system, it is consisted of the electric appliances equipments and the Tran
4、smission and the Distribution. It obtains the electric power from the electric power system, through its function of transformation and assign, transport and safety. Then transport the power to every place with safe, dependable, and economical. As an important part of powers transport and control, t
5、he transformer substation must change the mode of the traditional design and control, then can adapt to the modern electric power system, the development of modern industry and the of trend of the society life. Electric power industry is one of the foundations of national industry and national econo
6、mic development to industry, it is a coal, oil, natural gas, hydropower, nuclear power, wind power and other energy conversion into electrical energy of the secondary energy industry, it for the other departments of the national economy fast and stable development of the provision of adequate power,
7、 and its level of development is a reflection of the countrys economic development an important indicator of the level. As the power in the industry and the importance of the national economy, electricity transmission and distribution of electric energy used in these areas is an indispensable compon
8、ent.。 Therefore, power transmission and distribution is critical. Substation is to enable superior power plant power plants or power after adjustments to the lower load of books is an important part of power transmission. Operation of its functions, the capacity of a direct impact on the size of the
9、 lower load power, thereby affecting the industrial production and power consumption.Substation system if a link failure, the system will protect the part of action. May result in power outages and so on, to the production and living a great disadvantage. Therefore, the substation in the electric po
10、wer system for the protection of electricity reliability, 2 sensitivity and other indicators. Power plants and substations are connected user link in the middle, transformation and distribution of electric energy to play the role. According to the different tasks substation can be divided into step-
11、up transformer step-down transformer substation and two broad categories. Step-up substation built on the general power plant, the general step-down transformer near the load center built on the low.Voltage can also be divided according to medium voltage substation (60 kV and below), high-voltage su
12、bstations (110 220 kV), EHV Substation (330 765 kV) and Ultra High Voltage Substation (1000 kV and above). In electric power system according to their status as a hub substation can be divided into the middle substation substations and terminals. This requires a substation part of economic rationali
13、ty, the second part of safe and reliable, the only way to the normal operation of substation work services for the national economy. There are step-up transformer step-down transformer substation and two broad categories.Substations have been equipped with various protection devices, these devices a
14、re based on lower short-circuit load to a maximum load conditions, such as configuration settings and, therefore, in the event of the failure was similar to the specific circumstances under to judge by the system should automatically trip protection, and now the protection of the whole trip has been
15、 a very short time, the lifting of the fault, the system will automatically reclosing devices and the gateway to restore power quickly. This is to protect the lower the load is very favorable. This will not only protect the safety of the load equipment is in favor of extending the service life and r
16、educe equipment investment, and improved reliability of electricity supply, which is to improve the efficiency of industrial and agricultural production is very effective.Substations have been equipped with various protection devices, these devices are based on lower short-circuit load to a maximum
17、load conditions, such as configuration settings and, therefore, in the event of the failure was similar to the specific circumstances under to judge by the system should automatically trip protection, and now the protection of the whole trip has been a very short time, the lifting of the fault, the
18、system will automatically reclosing devices and the gateway to restore power quickly. This is to protect the lower the load is very favorable. This will not only protect the safety of the load equipment is in favor of extending the service life and reduce equipment investment, and improved reliabili
19、ty of electricity supply, which is to improve the efficiency of industrial and agricultural production is very effective.Increase in the efficiency of industrial products means lower product costs, increase market competitiveness, which will enable enterprises to 3 increase for the national economy
20、and make a greater contribution to development. Electricity supply reliability and other fields, can improve peoples quality of life, improve their living conditions. Analyse change to give or get an electric shock a mission for carrying and customers carries etc. circumstance, choose the address, m
21、ake good use of customer data proceed then carry calculation, ascertain the correct equipment of the customer. At the same time following the choice of every kind of transformer, then make sure the line method of the transformer substation, then calculate the short-circuit electric current, choosing
22、 to send together with the electric wire method and the style of the wire, then proceeding the calculation of short-circuit electric current. This first step of design included:(1) ascertain the total project (2) load analysis(3) the calculation of the short-circuit electric current (4) the design o
23、f an electric shock the system design to connect with system and the choice of line project (5) the choice and the settle of the protective facility (6) the contents to defend the thunder and protection of connect the earth. Along with the high and quick development of electric power technique, elec
24、tric power system then can change from the generate of the electricity to the supply the power. Design the task this time is aim at intensity of mastering of every subject knowledge of this speciality reflecting, and of test this specialitys study result. first, analyze the tend of load department a
25、ccording to all parameter of load about system and circuit on task book. It expounds the necessity to this situation from the rspect of increasing load. Then through to the generalization of planning to build the transformer substation and the analysis of the load materials, safe, economy and depend
26、ability are considered, has confirmed the mainly wiring form of 10kV. Calculated and supplied power in the range and confirmed TV stations number of the main voltage transformer through load finally, capacity and type, capacity and type of using the voltage transformer stand surely at the same time,
27、 finally, the result of calculation of calculating that and short out according to the electric current of largest lasting job, make the circuit to protect, the voltage transformer is protected, the bus bar is protected, prevent the thunder from protecting. This graduation project take the 10kV tran
28、sformer substation as the main design object, this 10kV transformer substation is the local important transformer substation, is the electrical power system 10kV voltage rank important part. This transformer substation is equipped with 2 main transformers, in the station the host wiring divides into 10kV,and 0.4 kV two voltages ranks.This design first chapter is an introduction,
