电气工程及其自动化毕业设计-威海大水泊镇35KV变电站电气设计.doc

1、I本科毕业论文（20 届）威海大水泊镇 35KV 变电站电气设计所在学院专业班级 电气工程及其自动化学生姓名指导教师完成日期II目 录摘要 .1Abstract .2引言 .31 原始资料 .31.1系统情况 .31.2 10kV负荷情况 .41.3本地区气象条件 .42负荷计算 .42.1 10kV侧的负荷计算 .42.2无功补偿 .42.2.1 无功补偿概述 .42.2.2无功补偿的计算 .52.3无功补偿装置 .52.4并联电容器装置的分组 .62.5并联电容器装置的接线 .63主变压器的选择 .63.1变电站的选址 .63.2主变压器的选择 .73.2.1 相数的选择 .83.2.2

2、绕组数与结构的选择 .83.2.3 绕组联接组号的选择 .83.2.4 调压方式的选择 .83.2.5 冷却方式的选择 .83.3规程中的有关变电所主变压器选择的规定 .83.4主变台数的确定 .94电气主接线方案的确定 .104.1 电气主接线的基本要求 .104.1.1 安全性 .104.1.2 可靠性 .114.1.3 灵活性 .114.1.4 经济性 .114.2电气主接线方案的选择 .124.2.1 35kV侧电气主接线的比较 .134.2.2 10kV侧电气主接线的比较 .145 短路电流计算 .155.1 概述 .155.1.1 产生短路的原因和短路的定义 .15III5.1.2

3、 短路的种类 .165.1.3 短路电流计算的目的 .165.2 短路电流计算的方法和条件 .165.2.1 短路电流计算方法 .165.2.2 短路电流计算条件 .165.3 短路电流的计算 .185.3.1 10kV侧短路电流的计算 .185.3.2 35kV侧短路电流的计算 .195.3.3 三相短路电流计算结果表 .206 电气设备的选择 .206.1电气设备选择的一般性原则 .206.1.1 技术条件 .206.1.2 环境条件 .226.2 断路器隔离开关的选择 .226.2.1 35kV侧进线断路器、隔离开关的选择 .226.2.2 35kV主变压器侧断路器、隔离开关的选择 .2

4、46.2.3 10kV侧断路器、隔离开关的选择 .246.2.4 选择的断路器、隔离开关型号表 .266.3 母线的选择及校验 .266.3.1 母线导体选择的一般要求 .266.3.2 35kV母线的选择 .276.3.3 10kV母线的选择 .286.3.4 母线选择结果 .296.4 互感器的选择 .296.4.1 电流互感器的选择 .296.4.2 电压互感器的选择 .306.5 熔断器的选择 .316.5.1 熔断器概述 .316.5.2 35kV侧熔断器的选择 .326.5.3 10kV侧熔断器的选择 .326.6 配电装置的选择 .326.6.1 配电装置概述 .326.6.2

5、35kV屋外配电装置 .326.6.3 10kV高压开关柜 .327 继电保护的设置 .337.1 电力变压器保护 .337.1.1 电力变压器保护概述 .337.1.2 电力变压器纵差保护接线 .34IV7.1.3 纵差动保护的整定计算 .347.1.4 变压器瓦斯保护 .357.1.5 过电流保护 .367.2 母线保护 .368 变电所的防雷保护 .368.1 变电所防雷概述 .368.2 避雷针的选择 .378.3 避雷器的选择 .379接地概述 .399.1接地设计 .39总结 .41参考文献 .42致 谢 .43VContentsAbstract .1Abstract .2Intr

6、oduction .21 raw data.21.1 system.21.2 10kV load .31.3 meteorological conditions in the region .32 load calculation .32.1 10kV side load calculation .32.2 reactive power compensation .42.2.1 reactive power overview .42.2.2 reactive power .42.3 reactive power compensation device.52.4 grouping of para

7、llel capacitor devices .52.5 connection of parallel capacitor device.63 main transformer selection.63.1 substation location.63.2 main transformer selection.83.2.1 Selection of phase number .83.2.2 number and structure of the winding.83.2.3 group choose winding connection.93.2.4 voltage options .93.2

8、.5 selection of cooling way.93.3 regulation of the transformer substation main transformer selection.93.4 the change in the number of .104 determination of electrical main wiring scheme .114.1 basic electrical wiring.114.1.1 security .114.1.2 reliability .124.1.3 flexibility .134.1.4 economics.144.2

9、 selection of electrical main wiring scheme .144.2.1 35kV side of the main electrical wiring .154.2.2 10kV side of the main electrical wiring .175 calculation of short-circuit current .185.1 overview.18VI5.1.1 definition of short circuit cause and short circuit.185.1.2 type.185.1.3 The purpose of sh

10、ort-circuit current calculation .185.2 methods and conditions for calculating short-circuit current.195.2.1 short-circuit current calculation method .195.2.2 short-circuit current condition.195.3 calculation of short-circuit current .215.3.1 10kV side short-circuit current calculation .215.3.2 35kV

11、side short-circuit current calculation .235.3.3 three-phase short-circuit current calculation results table.236 the choice of electrical equipment.246.1 general principles for electrical equipment selection.246.1.1 technical condition .246.1.2 environmental conditions .266.2 choice of circuit breake

12、r isolation switch.266.2.1 35kV side into the circuit breaker, isolating switch.266.2.2 35kV main transformer circuit breaker, isolating switch.286.2.3 10kV circuit breaker, isolating switch.286.2.4 choice of circuit breakers, isolated switch type table.296.3 bus selection and check.306.3.1 General

13、requirements for bus conductor selection.306.3.2 35kV bus .316.3.3 10kV bus .336.3.4 bus selection results.336.4 choice of transformer .346.4.1 current transformer.346.4.2 voltage transformer choice .356.5 fuse .366.5.1 fuse overview .366.5.2 35kV side fuse.376.5.3 10kV side fuse.376.6 power distrib

14、ution device.376.6.1 distribution device overview .376.6.2 35kV outdoor distribution device.376.6.3 10kV high voltage switch cabinet .387 relay settings.397.1 power transformer protection.397.1.1 power transformer protection overview .39VII7.1.2 power transformer differential relay connection.397.1.3 differential protection setting calculation.407.1.4 transformer gas protection.417.1.5 over current protection .417.2 bus protection .428 substation lightning protection.428.1 substation lightning protection overview .428.2 the choice of lightning rod .