高压变电站电气一次系统毕业设计外文翻译-电气类(编辑修改稿)

高压变电站电气一次系统毕业设计外文翻译-电气类(编辑修改稿)内容摘要：

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 all voltages , the following basic considerations are taken into account: 1. Preferable employment of a singlebus system with using twobus systems only to ensure a reliable and economic power supply。 2. Wide use of unitized constructions and busless substations。 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 rework. of simple and cheap devicesisolating switches ,shortcircuiting switches ,loadbreaking 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 switchgear circuitries are so made that using the equipment of each production line is fed from individual transformers ,assemblies ,the lines to allow their discon。