某大学供电系统设计毕业论文

辽宁科技大学本科生毕业设计第页

I

某大学供电系统设计

摘 要

通过对设计任务工程背景的分析，确定了各变电所高低压主接线结构，并根据电源情况、负荷水平与功率因数要求等条件对全系统进行了详细设计。首先，计算实际负荷，选择10kV供电用变压器。届时已考虑到无功功率补偿因素，由此可以免去部分迭代过程，计算较为简便。在进行上述设计过程中，确定了无功功率补偿容量，得出计算负荷，由此选择线缆。根据总计算负荷选择35kV供电用变压器并进行无功功率补偿。其次，通过对系统的短路计算分析，选择高低压断路器、高压隔离开关、开关柜和互感器。再次，对35kV和10kV变电所的平面布置、照明、接地和防雷进行设计。

关键词：供电系统；负荷计算；短路计算；继电保护

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II

Power Supply System Design In a University

Abstract

Through the analysis of the design task engineering background, the high and low voltagesubstation main wiring structure is determined, and according to the power supply situation, the level of load and power factor requirements such as conditions of the whole system has carried on the detailed design. First, calculate the actual load, select 10 kv power supply transformer. Have given the reactive power compensation factor, which can remove part of the iterative process, simple calculation. In the design process, determine the reactive power compensation capacity, computing load, select cable. According to the total computational load selection of 35 kv power supply transformer and reactive power compensation. Secondly, by analyzing the system short circuit calculation, choose high and low voltage circuit breaker, high-voltage isolating switch, switch and transformer. Again, about 35 kv and 10 kv substation layout, lighting, earthing and lightning protection design.

Key words: Power system; Load calculation; Short-circuit calculation; Relay protection

辽宁科技大学本科生毕业设计第页

III

目录

1 绪论 ...................................................... 1

1.1设计原始依据............................................................ 1

1.1.1全部用电设备负荷情况 ............................................ 1

1.1.2电源情况 .......................................................... 1 1.1.3气象及其它资料 ................................................... 1 1.2设计内容和要求 ......................................................... 1 1.3设计方法和步骤 ......................................................... 3

1.3.1设计原则和方法 ................................................... 3 1.3.2设计步骤 .......................................................... 3

2 供电系统 .................................................................... 4

2.1供电系统结构设计 ....................................................... 4

2.1.1 35kV变电所主接线结构方案选择 .............................. 4 2.1.2 10kV变电所主接线结构方案选择 .............................. 5 2.2 变配电站的站用电源 .................................................... 6

3 系统的负荷分析及主设备选择 ............................................ 7

3.1 系统负荷分析概述 ...................................................... 7

3.1.1系统的计算负荷 ............................................. 7 3.1.2无功功率补偿 ............................................... 7 3.1.3供电用变压器 ............................................... 8 3.2 10kV等级负荷计算及电容补偿计算 ...................................... 8

3.2.1 10kV变电所负荷计算 ........................................ 9 3.2.2 10kV等级线缆选择 ......................................... 12 3.3 35kV等级负荷计算及电容补偿计算 ..................................... 15

3.3.1 35kV变电所负荷计算 ....................................... 15 3.3.2 35kV等级线缆选择 ......................................... 15

4 系统的短路分析 ........................................................... 17

4.1短路及短路电流 ........................................................ 17

4.1.2 短路电流计算的规定 ............................................. 17 4.2短路电流计算........................................................... 17

4.2.1 系统参数 ................................................. 17

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IV 4.2.2 35kV进线断路器出口处短路电流 ............................. 18 4.2.3 35/10.5kV变压器二次侧出口处短路电流 ...................... 18 4.2.4 10kV进线断路器出口处短路电流 ............................. 19 4.2.5 0.4kV断路器出口处短路电流 .................................... 20

5 开关设备及互感器选择 .................................................. 22

5.1设备选择依据........................................................... 22 5.2高压开关设备的选择 .................................................... 22

5.2.1 35kV进线断路器与隔离开关选择 ............................. 22 5.2.2 35/10.5kV变压器二次侧出口处断路器选择 .................... 24 5.2.3 10kV进线断路器与隔离开关选择 ............................. 25 5.3低压开关设备的选择 .................................................... 27

5.3.1低压路器选择依据 .......................................... 27 5.3.2 0.4kV断路器选择 .......................................... 27 5.4互感器的选择........................................................... 28

5.4.1电流互感器的选择 .......................................... 28 5.4.2电压互感器的选择 .......................................... 32

6 变电站结构设计及平面布置 .............................................. 33

6.1变电站布置特征 .............................................. 33 6.2变电站的照明设计 ............................................ 33 6.3变电站的防雷设计 ............................................ 33 6.4变电站的接地设计 ............................................ 33

致 谢 ..................................................................... 35 参考文献 ..................................................................... 36