本科毕业设计-机械厂变电所的电气设计.doc

机械厂变电所的电气设计 摘要 本文介绍了机械厂变电所的电气设计。文中对变电所所址的选择、主接线的选择、高压设备的选择、负荷计算、短路电流计算、各种继电保护选择及防雷系统皆有说明。特别对主接线的选择,变压器的选择与短路电流的计算作了详细的说明和分析。其中还对变电所的主接线，高低压侧的一些保护装置等通过CAD制图直观的展现出来。 通过查找大量相关资料并到工厂实习，本次设计的内容更加接近实际。设计中进行了防雷和接地的设计。这样可以使变电所有效的避免雷击，保证变电站的安全；可以有效的保护用电设备，防止过电流的危害；可以保证该变电站具有稳定的输出电压。 本次设计采用两台主变压器。一次接线采用单母线，二次接线采用单母线分段制。这种接线方案不仅保证了供电的可靠性，而且灵活方便，适应负荷的发展。同时经济性也较好，减少了投资和有色金属的消耗量。 关键词：变电所，设计，选择，安全 The Electrical Design of The Mechanical Plant Substation Author:Shi wei Tutor:Mu Guo Hua Abstract This article describes the electrical design of the mechanical plant substation. The choice of the substation site, the choice of the main wiring , high voltage equipment selection, load calculations, short circuit current calculations, various relay’s selection and lightning protection systems are instructed. In particular, this paper gave a detailed description and analysis to the choice of the main wiring , the choice of the transformer and short circuit current calculations. The main connection of the substation, the protection device of high voltage and low voltage side are unfolded through the CAD drawing. Searching a lot of relevant information and visiting many factories, the design contents is closer to reality. This paper designs lightning protection and grounding. This allows the substation to avoid lightning and to ensure the safety of the substation. It can protects the power equipment and prevents the hazards of the overcurrent. And it ensures that the substation has a stable output voltage. The design uses two main transformers. The prinary side using a single bus. The secondaly side using a segmented single busbar. This wiring scheme ensures the reliability of electricity supply, it’s flexible and convenient ,and it adapt to the development of load. At the same time,it makes the economy is better, reduces the consumption of investment and non-ferrous metals. Key word: Transformer substati