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110kV变电站电气一次部分初步设计
摘 要
随着电力技术高新化、复杂化的迅速发展，电力系统在从发电到供电的所有领域中，通过新技术的使用，都在不断的发生变化。变电所作为电力系统中一个关键的环节也同样在新技术领域得到了充分的发展。
根据设计任务书的要求，本次设计为110kV变电站电气一次部分初步设计，并绘制电气主接线图及其他图纸。首先，进行了电气主接线的选择，把电气主接线分为110kV、35kV和10kV三个电压等级，经过各个方案的优缺点比较，确定了各个电压等级分别采用单母线分段带旁母接线、单母线分段带旁母接线和单母线分段接线。其次，根据要求进行了主变压器的选择、短路电流计算、主要电气设备选择及校验，包括断路器、隔离开关、电流互感器、电压互感器、母线等。最后，对防雷保护和接地方案的设计进行了选择。 关键词：变电站； 设计； 防雷保护
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ABSTRACT
Along with the economic development and the modern industry developments of quick rising, the design of the power supply system become more and more completely and system. Because the quickly increase electricity of factories, it also increases seriously to the dependable index of the economic condition, power supply in quantity. Therefore they need the higher and more perfect request to the power supply. Whether Design reasonable, not only affect directly the base investment and circulate the expenses with have the metal depletion in colour metal, but also will reflect the dependable in power supply and the safe in many facts. In a word, it is close with the economic performance and the safety of the people. Along with the high and quick development of electric power technique, electric power system then can change from the generate of the electricity to the supply the power.
From the guide of engineering design assignment, we have to design primary power-system of 110kV substation and draw main electrical one-line diagram and others. First, the main electrical connection can be divided into three voltage grades: 110kV, 35kV with 10kV.It deposits sectionalized single bus bar scheme, sectionalized single and sectionalized single bus bar scheme per grade. Second, there is a design for main electrical connection in this engineering, the calculation for short-circuit electric current, the selection of electrical device and calibration including circuit breaker, isolator, current，transformer, potential
transformer ,bus bar etc. At last, the design for distribution installation per voltage grade and lightning protection is also included.
Key Words：substation; design; lightning protection
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目 录
摘 要 ........................................................... i 1引言 ........................................................... 1 1.1设计的目的与意义 ............................................1 1.2负荷情况及分析 ..............................................1 1.3设计的任务书 ................................................2 2电气主接线及设计 ............................................... 3 2.1 电气主接线设计的基本要求 ....................................3 2.2 主接线接线方式概述 ..........................................4
2.2.1 110kV电气主接线 ......................................6 2.2.2 35kV电气主接线 .......................................8 2.2.3 10kV电气主接线 ......................................10 3主变压器的选择 ................................................ 12 3.1 主变压器台数的确定 .........................................12 3.2主变压器容量的选择 .........................................12 3.3 绕组数量和连接形式的选择 ...................................13 3.4 主变型式的选择 .............................................13 3.5 冷却方式的选择 .............................................14 3.6选型号 .....................................................14 4短路电流的计算 ................................................ 16 4.1计算短路电流的目的 .........................................16 4.2短路电流的计算步骤 .........................................17
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110kV变电站电气一次部分初步毕业设计说明
