河南理工大学矿用35kV地面变电所设计35KV矿用变电站设计.doc

摘要 随着经济的发展和现代工业建设的迅速崛起，供电系统的设计越来越全面、系统，工厂用电量迅速增长，对电能质量、技术经济状况、供电的可靠性指标也日益提高，对供电系统的设计有了更高、更完善的要求。而作为接受和分配电能的变电所在工业企业中占据很重要的地位，因此设计、分析、发展变电所是一项很重要的任务。本设计初步设计了煤矿地面35kV变电站的设计。其设计过程主要包括负荷计算、主接线设计、短路计算、电气设备选择、继电保护方案、变电所的防雷保护与接地等。通过对煤矿35kV变电站做负荷统计，用需用系数法进行负荷计算，根据负荷计算的结果确定出该站主变压器的台数、容量及型号。用标幺值法对供电系统进行了短路电流计算，为电气设备的选择及校验提供了数据。根据煤矿供电系统的特点，制定了矿井变电所的主结线方式、运行方式、继电保护方案。其中35kV侧为全桥接线，6kV主接线为单母分段。两台主变压器采用分列运行方式。并根据电流整定值以及相关数据的校验，选择了断路器、隔离开关、继电器、变压器等电气设备。 关键字：变电站；负荷统计；短路计算 ABSTRACT With the development of economy and the rapid rise of modern industrial building, the design of the power supply system more comprehensive, systematic, rapid growth in electricity plants, power quality, technical and economic conditions, supply reliability indicators are increasing the power supply system design have higher and better requirements. And as receiving and distributing power substation in industrial enterprises occupy a very important position, so the design, analysis, development substation is a very important task.This paper designed a preliminary mine surface 35kV substation. The design process includes load calculations, the main wiring design, short circuit calculations, electrical equipment selection, protection schemes, substation lightning protection and grounding. By doing mine 35kV substation load statistics, with the required coefficient method for load calculation, based on the results of load calculations determine the number of units of the main transformer station, capacity and models. Pu France with the power supply system for a short-circuit current calculation for electrical equipment selection and verification of data. According to the characteristics of coal-powered systems, developing the mine substation main connection mode, operation mode, relay protection scheme. Key words：substation；load calculation；short-circuit current. 目录 1 概 述 1 1.1 设计依据 1 1.2设计目的及范围 1 1.3矿井基础资料 1 2 负荷计算 3 2.1 负荷计算的目的 3 2.2 负荷计算方法 3 2.3 负荷计算过程 4 2.3.1 各用电设备组负荷计算 4 2.3.2各低压变压器的选择与损耗计算 6 2.4计算