电气类毕业论文外文翻译

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Power network is the power system of power generation equipment and electric equipment in the outside. Power network transmission and distribution, including three links. Mainly by power lines, substation and ac and dc converter (realize mutual transformation technology device). According to the function can be divided into the transmission lines, regional grid, tie and distribution network. Power network distribution in vast territory of plants and YongDianHu becomes an organic whole repeatedly, the production of electric power to scatter. Power network operation condition is safe, reasonable, directly affects the development of national economy. Therefore, the setting of power network computing research, has very important practical significance.As the electric power network scale unceasingly expands, the power system protection device of increasing of quantity and quality enhances unceasingly, relay protection management of complexity and difficulty of technology are also increasing. Its core is the power network of relay protection setting calculation. Based on the classic example to short-circuit fault fault current electricity network is introduced, and the calculation method of short-circuit current calculation system setting the further improvement and development are discussed.In power system and the actual operation before the operation parameters change, all need through short circuit calculation, solving some electrical equipment through the short-circuit current, relay protection setting value and the key parameter calibration equipment, electric equipment to ensure safe operation. Power system correctly grasp the basic principle of short-circuit current calculation method is correct and relay protection setting electrical equipment and related parameters of the value of the key. Through the calculation of the electric equipment and experienced impact to open to choose equipment capacity and provide technical basis. Meanwhile, through calculation of electrical equipment in various fault condition, giving the fault current protection device fixed value setting. These work in power system in the daily work appear particularly important and meaningful.This paper introduced the short-circuit current calculation method and process, then combines power network, through the analysis of the characteristics of a simple system of power networks relay protection setting calculation, this article analyzes the problems and the causes of different conclusion of different calculation methods applicable scope.Keywords: power network, The setting, Short-circuit current calculation, Relay protection, Short-circuit current,我请我老师翻译的 呵呵

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Electric power system network, in addition to other power generation equipment and electrical equipment parts. Electricity network, including substation, transmission, distribution three links. Mainly by power lines, substations and converter stations (to achieve the transformation between AC and DC technology device) form. According to the functions can be divided into transmission lines, regional power grid, contact lines and distribution networks. Electricity distribution network to the vast geographical region as close plants and electricity users, to focus on the production of electricity delivered to every household electricity distributed. Power network operating conditions are safe, reasonable, and directly affect the country's economic development. Therefore, power networks, setting calculation study has very important practical significance. With the power network have been expanding the number of power system protection devices increasing continuously improve quality, protection management work of the complexity and technical difficulty also increases. The core is the power network relay protection setting calculation. In this paper, short-circuit fault to present the classic example of the power network fault current calculation method, and setting short-circuit current calculation system further perfection and development is discussed briefly. Put into operation in power system operation before and the actual changes in the parameters are calculated through a short circuit, passing through some of the electrical equipment to solve short-circuit current, relay protection setting values on the key parameters and equipment check to ensure the safety of electrical equipment run. Correctly grasp the power system short-circuit current calculation of the basic principles and methods, is able to correctly set the value of electrical equipment and relay protection setting the key parameters. By calculating the impact of that equipment withstand current and breaking capacity required to provide technical basis for the selection of equipment. At the same time, can also be calculated in a variety of electrical equipment that under fault conditions the fault current, and thus to the protection of value tuning device. These work in the daily work of the power system is especially important and meaningful. This paper details the short-circuit current calculation method and process, and then combine the characteristics of electricity networks, by analyzing a simple system of power network relay setting calculation to undertake a study to analyze the reasons come to different conclusions and different methods for calculating range. Key words: power network; calculation; short-circuit current calculation; protection; short circuit surge current;

Power network is the power system of power generation equipment and electric equipment in the outside.