某通用机械厂10kV配电系统设计(2)

辽宁石油化工大学继续教育学院论文

某通用机械厂10kV配电系统设计

摘 要

工厂供电系统就是将电力系统的电能降压再分配电能到各个厂房或车间中去，它由工厂降压变电所，高压配电线路，车间变电所，低压配电线路及用电设备组成。工厂总降压变电所及配电系统设计，是根据各个车间的负荷数量和性质，生产工艺对负荷的要求，以及负荷布局，结合国家供电情况，解决对各个部门的安全可靠，经济技术的分配问题。本厂是由两路10kV的电缆进线，通过母线及高压开关柜将电能馈送到5个变电所的系统。其基本内容有以下几个方面：变配电所位置的确定，变电所及全厂的负荷计算，无功功率补偿，短路电流计算，配电系统的接线方式和高压配电所的主接线图设计，电气设备的选择，母线以及各馈电线的选择及校验等。

关键词：配电；无功功率补偿；短路电流；变电所

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辽宁石油化工大学继续教育学院论文

A general machinery plant of 10kV power

distribution system design

Abstract

Power system of the factory is to step down power and then to distribute the power to the factories and workshops. It consists of step-down substation plant, high pressure distribution lines, substation plant, low-voltage distribution lines and electric equipment. The total step-down substation plant and design of distribution system, which is to resolve the security and the distribution of economic and technological problems, is based on the number and nature of each workshop, the production process on the load requirements, and as well as, the load distribution. The factory is a system, with 2 entrance cables of 10kv, distributing the electricity to 5 substations through bus and high voltage switchgear. The basic contents are as follows: decision on the location of the substation and distribution station, load estimation of the substation and the entire factory, reactive power compensation, short-circuit current calculation, the connection mode of distribution system, main wiring graph design of high voltage distribution station, choice of the electric equipment, choice and check of bus and other wires.

Keywords: Distribution ；Reactive power compensation ；Short-circuit current ；Substation

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辽宁石油化工大学继续教育学院论文

目 录

摘 要 .................................................................................................................................................... I Abstract .................................................................................................................................................. II 1 负荷计算及无功功率补偿................................................................................................................. 1

1.1 负荷计算 ................................................................................................................................. 1

1.1.1 按需要系数法确定计算负荷 ....................................................................................... 1 1.1.2 工厂的功率因数 ........................................................................................................... 2 1.2 No.1车间变电所 ...................................................................................................................... 3

1.2.1 No.1车间变电所内各车间负荷 ................................................................................... 3 1.2.2 No.1车间变电所负荷及无功功率补偿 ....................................................................... 3 1.3 No.2车间变电所 ...................................................................................................................... 5

1.3.1 No.2车间变电所内各车间负荷 ................................................................................... 5 1.3.2 No.2车间变电所负荷及无功功率补偿 ....................................................................... 6 1.4 No.3车间变电所 ...................................................................................................................... 8

1.4.1 No.3车间变电所内各车间负荷 ................................................................................... 8 1.4.2 No.3车间变电所负荷及无功功率补偿 ....................................................................... 8 1.5 No.4车间变电所 ...................................................................................................................... 9

1.5.1 No.4车间变电所内各车间负荷 ................................................................................... 9 1.5.2 No.4车间变电所负荷及无功功率补偿 ..................................................................... 10 1.6 No.5车间变电所 .................................................................................................................... 11

1.6.1 No.5车间变电所内各车间负荷 ................................................................................. 11 1.6.2 No.5车间变电所负荷及无功功率补偿 ..................................................................... 13 1.7 全厂总负荷及无功功率补偿 ................................................................................................ 14 2 无功功率补偿 .................................................................................................................................. 17

2.1 无功补偿后的工厂计算负荷 ................................................................................................ 17 2.2 无功功率补偿方案的确定及实施 ........................................................................................ 17

2.2.1 车间变电所的无功功率补偿 ..................................................................................... 18 2.2.2 母线上的无功功率补偿 ............................................................................................. 19

3 短路电流计算 .................................................................................................................................. 20

3.1 短路电流介绍........................................................................................................................ 20

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辽宁石油化工大学继续教育学院论文

3.2 用标幺制法进行短路计算 .................................................................................................... 20 3.3 短路电流计算........................................................................................................................ 21

3.3.1 k－1点的短路电流 ..................................................................................................... 22 3.3.2 母线上k－2点的短路电流 ....................................................................................... 22 3.3.3 k－3~7点短路电流 .................................................................................................... 23 3.3.4 k－8点的短路电流 ..................................................................................................... 23

4 导线选择 .......................................................................................................................................... 25

4.1 概述 ....................................................................................................................................... 25

4.1.1 电缆的选择 ................................................................................................................. 25 4.1.2 导线和电缆截面选择计算的条件 ............................................................................. 25 4.1.3 按发热条件选择导线和电缆的截面 ......................................................................... 26 4.1.4 线路电压损耗的计算 ................................................................................................. 26 4.1.5 按允许电压损耗选择、校验导线截面 ..................................................................... 28 4.1.6 母线的选择方法 ......................................................................................................... 29 4.2 导线选择 ............................................................................................................................... 30

4.2.1 10kV进线选择 ............................................................................................................ 30 4.2.2 母线导线选择 ............................................................................................................. 31 4.2.3 馈给1号变电所的线路选择 ..................................................................................... 32 4.2.4 馈给2号变电所的线路选择 ..................................................................................... 33 4.2.5 馈给3号变电所的线路选择 ..................................................................................... 34 4.2.6 馈给4号变电所的线路选择 ..................................................................................... 34 4.2.7 馈给5号变电所的线路选择 ..................................................................................... 35

5 配电系统接线方式及变配电所的主接线图 ................................................................................... 37

5.1 配电系统的接线方式 ............................................................................................................ 37 5.2 变配电所的主接线图 ............................................................................................................ 38 6 高压一次设备选择 .......................................................................................................................... 40

6.1 设备介绍 ............................................................................................................................... 40

6.1.1 概述 ............................................................................................................................ 40 6.1.2 高压一次设备介绍 ..................................................................................................... 40 6.1.3 高压一次设备选择条件 ............................................................................................. 41

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辽宁石油化工大学继续教育学院论文

6.2 设备选择 ............................................................................................................................... 41

6.2.1 高压开关柜No.101 .................................................................................................... 42 6.2.2 高压开关柜No.102 .................................................................................................... 43 6.2.3 高压开关柜No.103 .................................................................................................... 44 6.2.4 高压开关柜No.104 .................................................................................................... 44 6.2.5 其它高压开关柜的选择 ............................................................................................. 45 6.2.6 1号变电所变压器选择 ............................................................................................... 46

结 论 .................................................................................................................................................... 47 参考文献 .............................................................................................................................................. 48 谢 辞 .................................................................................................................................................... 49

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