哪位大侠帮忙把这篇文章翻译成英文,不要机器翻译啊,毕业论文用,急啊

发布网友发布时间：2023-08-15 09:45

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热心网友时间：2024-12-04 18:57

The distribution network is in power system and power transmission network connection among the link directly to the vast number of users with electricity. Compared with the transmission network, with low voltage distribution network, the loss is big, the low degree of automation. The operating condition of the distribution network security, whether reasonable, is not only related to the user, the reliability of the lateral power but also directly affect the safety of network operation, and the economy. The calculation of the distribution network research, has very important practical significance.
The calculation of the distribution network is mainly short-circuit current calculation. With the distribution 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. The traditional method of relay protection management methods and challenges. Therefore, the development of a practical complete relay protection setting procere, to improve the working efficiency and protect computation efficiency, has important realistic meaning and theoretical significance and relay protection setting calculation procere of the core is the distribution network of relay protection setting calculation.
Based on the classic example of fault and through the analysis of a typical system as an example to introce the distribution network fault current calculation and the application of the system, and to further improvement and development of the system 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. Therefore, short-circuit current calculation mole is various protection setting calculation software in the core and key parts. In general, short-circuit current calculation when first through the network to solve various power, Jane short-circuit point of transfer, then linear circuit impedance of additive, short-circuit point is the starting time of transient current, current and the required open capacity, etc. And 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, through the fault current transformer, transform and quadratieally learned to protect equipment to ensure the setting value, in accordance with the requirements in protecting equipment failure, rece accidents resection fault equipment, to ensure safe operation of the power system. These work in power system in the daily work also appears especially important and meaningful.
This paper introces the concrete steps to short-circuit current calculation method and calculation. Through the analysis of a common 11OkV voltage rating system, using two different methods of calculation, the two methods for specific: one kind is directly use power branch current calculation, another kind is calculated using the system transfer impedance.
Find two kinds of methods for solving the calculation result differences. The reasons of difference analysis, found only when the power supply system, totally two methods to completely equivalent, When the system's power to solve different properties and short-circuit current, suggest the first kind of solving method, otherwise will cause greater error. This research work for a reasonable method for power system of short-circuit current calculation has certain practical significance.