GeneralRequirementsToConstructionOfSubstation变电站建设的一般要求大学毕业论文外文文献翻译及原文

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　　文献、资料中文题目：变电站建设的一般要求

　　文献、资料英文题目：General Requirements to Construction of Substation

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　　翻译日期： 2017.02.14

　　Substations are a vital element in a power supply system of industrial enterprises．They serve to receive ，convert and distribute electric energy .Depending on power and purpose ,the substations are divided into central distribution substations for a voltage of 110-500kV;main step-down substations for110-220/6-10-35kV;deep entrance substations for 110-330/6-10kV;distribution substations for 6-10kV;shop transformer substations for 6-10/0.38-0.66kV.At the main step-down substations, the energy received from the power source is transformed from 110-220kV usually to 6-10kV(sometimes 35kV) which is distributed among substations of the enterprise and is fed to high-voltage services.

　　Central distribution substations receive energy from power systems and distribute it (without or with partial transformation) via aerial and cable lines of deep entrances at a voltage of 110-220kV over the enterprise territory .Central distribution substation differs from the main distribution substation in a higher power and in that bulk of its power is at a voltage of 110-220kV;it features simplified switching circuits at primary voltage; it is fed from the power to an individual object or region .Low-and medium-power shop substations transform energy from 6-10kV to a secondary voltage of 380/220 or 660/380.

　　Step-up transformer substations are used at power plants for transformation of energy produced by the generators to a higher voltage which decreases losses at a long-distance transmission .Converter substations are intended to convert AC to DC (sometimes vice versa) and to convert energy of one frequency to another .Converter substations with semiconductor rectifiers are convert energy of one frequency to another .Converter substations with semiconductor rectifiers are most economic. Distribution substations for 6-10kV are fed primarily from main distribution substations (sometimes from central distribution substations).

　　With a system of dividing substations for 110-220kV, the functions of a switch-gear are accomplished by switch-gears for 6-10kV at deep entrance substations.

　　Depending on location of substations their switch-gear may be outdoor or indoor. The feed and output lines at 6-10kV substations are mainly of the cable type .at 35-220kV substations of the aerial type .When erecting and wiring the substations, major attention is given to reliable and economic power supply of a given production.

　　Substations are erected by industrial methods with the use of large blocks and assemblies prepared at the site shops of electric engineering organizations and factories of electrical engineering industry .Substations are usually designed for operation without continuous attendance of the duty personnel but with the use of elementary automatic and signaling devices.

　　When constructing the structural part of a substation .it is advisable to use light-weight industrial structures and elements (panels ,floors ,etc.) made of bent sections .These elements are pre-made outside the erection zone and are only assembled at site .This considerably cuts the terms and cost of construction.

　　Basic circuitry concepts of substations are chosen when designing a power

　　supply system of the enterprise .Substations feature primary voltage entrances .transformers and output cable lines or current conductors of secondary voltage .Substations are mounted from equipment and elements described below .The number of possible combinations of equipment and elements is very great .When elaborating a substation circuitry ,it is necessary to strive for maximum simplification and minimizing the number of switching devices .Such substations are more reliable and economic .Circuitry is simplified by using automatic enclosure or automatic change over to reserve facility which allows rapid and faultless redundancy of individual elements and using equipment.

　　When designing transformer substations of industrial enterprises for all voltages, the following basic considerations are taken into account:

　　1. Preferable employment of a single-bus system with using two-bus systems only to ensure a reliable and economic power supply;

　　2. Wide use of unitized constructions and bustles substations;

　　3.Substantiated employment of automatics and telemetry ;if the substation design does not envisage the use of automatics or telemetry ,the circuitry is so arranged as to allow for adding such equipment in future without excessive investments and re-work.

　　http://www.wendangwang.come of simple and cheap devices-isolating switches ,short-circuiting switches ,load-breaking isolators ,fuses ,with due regard for their switching capacity may drastically cut the need for expensive and critical oil ,vacuum ,solenoid and air switches .Substation and switch-gear circuitries are so made that using the equipment of each production line is fed from individual transformers ,assemblies ,the lines to allow their disconnection simultaneously with mechanisms without disrupting operation of adjacent production flows.

　　When elaborating circuitry of a substation, the most vital task is to properly choose and arrange switching devices (switches, isolators, current limiters, arresters, high-voltage fuses).The decision depends on the purpose, power and significance of the substation.

　　Power System Substation is an important and indispensable component of the power it assumed the task of conversion and distribution of grid security and the economy play a decisive role in running is to contact the user’s power plants and intermediate links. With economic development, expanding grid capacity, reliability of operation of the power grid is getting higher and higher requirements. Development

　　of science and technology, intelligent switches, photoelectric current and voltage transformer, a run-line state detection, training simulation Substation Operation matures, such as high-tech, as well as fiber-optic technology, computer high-speed network system in the development of real-time applications, bound to the existing substation automation technology have a profound impact, all-digital substation automation system development trend.

　　Power system is operated by the production, transmission, distribution and consumption of a variety of power linked to the composition of electrical equipment. As a result of a large number of powers can not be stored, we must ensure that the production of electricity and energy balance. With the scientific and technological advances in the technological development of our country has reached a certain level. Intelligent switches, photoelectric current and voltage transformer, a run-line state detection, training simulation Substation Operation matures, such as high-tech, as well as fiber-optic technology, computer high-speed network system in the development of real-time applications, significantly increase the transformation degree of automation.

　　Design of our substation cable programs tend to be simple, many of the recent domestic new 220 k V substation and 110kV voltage levels of wiring without the use of dual-bus bypass bus. The use of GIS, the priority sub-bus single wire. Terminal Substation, the line as far as possible, such as transformer unit wiring. A large number of the introduction of new technology, transformer substation rising level of electrical equipment, power distribution devices from the traditional form of moving toward oil-free, vacuum switches, SF6 switches and mechanical, electrical equipment combination of the development of small-scale integration. In recent years the world famous high-voltage electrical equipment companies have been developing, the development of the various types of 145-550 kV outdoor high-pressure and ultrahigh-pressure combination of electrical appliances, some high-voltage switchgear plant has also started production of 145 k V compact outdoor portfolio electrical appliances. Smart plug-in type outdoor switchgear is a more complete high-pressure and ultrahigh-pressure switch system, which includes electrical first and second equipment, as well as the associated fiber optic cable, such as plug-type compound. The entire distributed substation automation system; the introduction of advanced network technology; substation and the construction area covers an area of reduced

　　substation program to simplify wiring, switchgear, bus and steel pipes, such as the use of stents to substation layout is more simple, the abolition of the former station area and optimize the layout to make a substantial decline in an area substation.

　　With technological advances, the traditional relay protection devices are gradually being replaced by microprocessor-based protection. Microprocessor-based protection is referred to as the protection of PC computer, a digital relay protection, is based on the programmable digital circuit technology and real-time digital signal processing technology of the Power System Protection. At present, both at home and abroad have been developed to 32-bit digital signal processor for hardware-based protection, control, measurement, and data communications integration of microprocessor-based protection control devices, and artificial intelligence technology into a number of relay protection, such as artificial neural networks, fuzzy theory to determine the realization of fault type, fault location, the direction of protection, the main equipment and other new methods of protection. By means of wavelet analysis of the theory of digital signal failure of the entire frequency band information and to achieve fault detection. These artificial intelligence technologies to improve the accuracy of failure to provide a means of identification, but also some single-frequency signal based on the traditional method difficult to identify the problems to be resolved. At present, the microprocessor-based relay protection is along the microprocessor-based protection network, and intelligent, adaptive and protection, control, measurement, signal, data communications integration direction.

　　The most basic request that charged barbed wire net in the city circulates is safe and stable. The core problem of charged barbed wire net safety in the city stability wants to build up to be a with the city mutually accommodative of, reasonable of charged barbed wire net structure. This text passes and programs to the charged barbed wire net with electric power and designs the technique principle of the aspect analysis. Elaborated the standard concerning electric voltage grade, power supply credibility, power supply ability and charged barbed wire net safe power supply requests etc. some problems that should notice in the charged barbed wire net safety; And have already aimed at sex's elaborating request to the concrete design principle opposite charged barbed wire net safe power supply of the 220 kV transformer substation and 110kV transformer substation.

　　How to promise power supply credibility

　　1) Satisfy charged barbed wire net power supply safe standard. The power supply