冶金工业厂35kV降压变电站设计大学论文.doc

摘 要 防雷保护接地装置。 关键词：短路配电Abstract A Metallurgical Machinery factory if the transmission and distribution system have a sound planning, savings can be good, reasonable land use planning, reducing power loss, upgrade quality and ensure the normal operation of systems. In this paper, transmission and distribution of a comprehensive design, content is divided into four parts. The first part discussed the background and purpose, then the raw data to conduct a preliminary analysis, to determine a good step in the design of this thesis. The second part of the metallurgical have plant to identify good part of the load, an accurate calculation, through the reactive power compensation system to improve the power factor to reduce the power loss. According to load the importance and the size of a reasonable load the main cables, power supply lines and preliminary design of the transformer choice. The third part is to ensure that the safety system, first of all, the system accurate short-circuit, and then be the basis of the current short-circuit current and impact of a series of high and low voltage equipment selection and validation to ensure the normal operation of systems. The fourth part of the design in accordance with the requirements of lightning protection measures for the final selection and ground equipment design, increased system security. In the final papers also include the design drawings and calculation process. Key words：Load calculationMain wiring design、Short-circuit calculation 、Distribution Device 目 录 1 绪 论 1 1.1 论文背景及目的 1 1.2 论文研究方法 1 1.3 供电设计的主要内容 1 2 2.1 负荷计算 2 2 2.1.2 按需要系数法确定计算负荷 2 2.1.3 6kV负荷计算 3 2.1.4 NO.1~NO.5变电所380V负荷计算 3 2.2 无功补偿计算 4 2.2.1 确定补偿容量 4 2.2.2 补偿后的功率因素 6 变压器选择与主接线方案的设计 8 3.1 选择降压变压器 8 3.1.1 35kV/6kV变压器的选择 8 3.1.2 6kV/380V变压器的选择 9 3.2 工厂主接线方案的比较 10 3.2.1 工厂总降压变电所高压侧主接线方式比较 10 3.2.2 工厂总降压变电所低压侧主接线方式比较 10 3.2.3 工厂总降压变电所供配电电压的选择 11 3.3 总降压变电所电气主接线设计 11 3.4 高低压配电柜选择 11 短路电流计算 13 4.1 短路计算的意义 13 4.2 短路计算 13 电气设备