1、 I 摘要摘要 本论文主要是对小型工厂供配电系统的电气部分进行设计。工厂由户外引入 10kV 的高压电源, 经过工厂变电所降为 380V/220V 的低压电, 直接供给工厂车间 的动力系统和照明系统。 在选择设备之前,先对工厂负荷进行计算,确定工厂总的负荷容量,同时在 低压母线侧进行无功功率的补偿,以提高功率因数。根据补偿后的负荷容量,选 择工厂变电所变压器的容量和台数,然后选择合适的车间配电方案,画出供配电 系统主接线图。 高压一次设备、低压一次设备和导线截面积选择时,都必须满足电路正常条 件下和短路故障条件下工作的要求。 最后,进行继电保护和防雷接地,来提高系统的安全性和可靠性。 关键词:
2、关键词:负荷计算,主接线,方案选择,设备选择 内蒙古科技大学矿业与煤炭学院毕业设计说明书 II Abstract This thesis is mainly on the small plant power supply and distribution system of the electrical part design. The factory introduced by10kV outdoor high voltage power plant substation, after falling to 380V/220V low voltage, direct supply facto
3、ry workshop power system and lighting system. In the selection of electrical equipment, first on the factory load calculation, to determine the total factory load capacity, at the same time in the low voltage side of the reactive power compensation, in order to improve the power factor. According to
4、 the compensated load capacity, plant selection of substation transformer capacity and numbers, and then determine the factory uses the power supply system, select the appropriate workshops distribution scheme, draw the main wiring diagram of power supply and distribution system. High voltage primar
5、y equipment, low-pressure primary equipment and wire cross-sectional area selection, must meet the circuit under normal conditions and under fault conditions work requirements. Finally, for relay protection and lightning protection and grounding, to enhance the security and reliability of system. Ke
6、y words: distribution, load calculation, the three-phase short circuit, relay protection III 目录目录 摘要 . I Abstract . II 目录 . III 1 绪论 .1 2 负荷计算和无功补偿 .3 2.1 金工车间负荷计算 .3 2.1.1 金属切削机床组设备容量 3 2.1.2 桥式起重机容量 3 2.1.3 金工车间照明 3 2.2 全厂总负荷 .4 2.2.1 变压器低压侧 4 2.2.2 变压器高压侧 4 2.2.3 无功功率的补偿 5 2.2.4 补偿后变压器容量和功率因数 5 3 金工车间配电系统的确定 .8 3.1 工厂低压配电线路的结线方式 .8 3.2 配电方案 .8 3.3 方案比较 .9 4 电气设备选择 . 11 4.1 变压器的选择 . 11 4.2 低压补偿柜的选择 . 11 4.3 车间导线截面及配电箱的选择 . 11 4.3.1 车间分电箱的选择 12 4.3.2 车间总干线的选择 17 4.4 低压配电屏的选择 .20 4.5 高压开关柜的