河南理工大学毕业设计(论文)说明书
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
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河南理工大学毕业设计(论文)说明书
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.
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河南理工大学毕业设计(论文)说明书
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6kV母线上补偿前的总负荷并初选变压器 ........................... 7
2.4.1功率因数补偿与电容柜的选择 ................................... 8 2.4.2主变压器校验及经济运行方案 ................................... 9
3电气主接线设计 ......................................................... 11
3.1 对主接线的基本要求 ............................................... 11 3.2 本所电气主接线方案的确定 ......................................... 11
3.2.1 确定矿井35kV进线回路 ....................................... 11 3.2.2 35kV、6kV主接线的确定 ...................................... 11 3.2.3下井电缆回数的确定 .......................................... 12
4 短路电流计算 ........................................................... 14
4.1 短路电流计算的目的 ............................................... 14 4.2短路电流计算过程 .................................................. 14
4.2.1选取短路计算点并绘制等效计算图 .............................. 14 4.2.2选择计算各基准值 ............................................ 16 4.2.3计算各短路点的短路电流 ...................................... 17
5 高压电气设备的选择 ..................................................... 20
5.1 高压电气设备选择原则 ............................................. 20 5.2 高压开关设备的选择及校验 ......................................... 20
5.2.1 高压断路器的选择及校验 ...................................... 20 5.2.2 隔离开关的选择 .............................................. 23
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河南理工大学毕业设计(论文)说明书
5.2.3电流互感器的选择 ............................................ 24 5.2.4电压互感器的选择 ............................................ 25 5.2.5避雷器的选择 ................................................ 26 5.2.6 支柱绝缘子和套管绝缘子的选择 ................................ 26 5.2.7 开关柜的选择 ................................................ 27 5.3 电力线路的选择 ................................................... 28
5.3.1 35kV电源架空线路选择 ....................................... 28 5.3.2 6kV母线的选择 .............................................. 29 5.3.3 主提升机6kV电缆线路选择 .................................... 30 5.3.4 6kV下井电缆选择 ............................................ 31 5.3.5 6kV架空线路的选择 .......................................... 33 6.1 变电所各断路器过流保护的设置与配合 ............................... 36
6.1.1 QF1、QF2、QF3断路器保护的设置与配合 .......................... 36 6.1.2 QF4、QF5断路器上保护的设置与配合 ............................ 36 6.1.3 各６kV低压馈出线断路器的设置与配合 ......................... 36 6.1.4 6kV联络开关QF8的保护设置与配合 ............................. 37 6.2 各断路器的过流保护整定 ........................................... 37
6.2.1 QF1、QF2、QF3过流保护整定 .................................... 37 6.2.2 QF4、QF5的过流保护整定 ...................................... 38 6.2.3各6kV馈出线的过流保护整定 .................................. 39 6.2.4 QF8过流保护整定 ............................................. 40
7 变电所的防雷与接地 ..................................................... 42
7.1 变配电所的防雷设计 ............................................... 42 7.2 接地装置的设计及计算 ............................................. 43 8 变电所的平面布置 ....................................................... 44
8.1 变电所位置选择 ................................................... 44 8.2 配电室建筑要求 ................................................... 44 8.3 控制室布置 ....................................................... 45 结论 ..................................................................... 47 致谢 ..................................................................... 48 参考文献 ................................................................. 49
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