高壓變電站電氣一次系統(tǒng)畢業(yè)設(shè)計(jì)外文翻譯-電氣類-免費(fèi)閱讀
【正文】 it is fed from the power to an individual object or region .Lowand mediumpower shop substations transform energy from 610kV to a secondary voltage of 380/220 or 660/380. Stepup transformer substations are used at power plants for transformation of energy produced by the generators to a higher voltage which decreases losses at a longdistance 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 610kV are fed primarily from main distribution substations (sometimes from central distribution substations).With a system of dividing substations for 110220kV, the functions of a switchgear are acplished by switchgears for 610kV at deep entrance substations. Depending on location of substations their switchgear may be outdoor or indoor. The feed and output lines at 610kV substations are mainly of the cable type .at 35220kV 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 5 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 lightweight industrial structures and elements (panels ,floors ,etc.) made of bent sections .These elements are premade 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 powersupply 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 binations of equipment and elements is very great .Whenelaborating 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 reclosure 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 al
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