35kV总降压变电所及高压配电系统初步设计

1目录1前言......................................................11.1毕业设计背景.............................................11.2毕业设计意义.............................................11.3设计要求.................................................1235kV变电所一次系统负荷计算...............................22.1变电所电力负荷分组与计算.................................22.2需要系数法的计算.........................................22.2.1设备负荷计算举例...................................32.2.2总配电所和车间变电所数量的确定.....................42.2.3各车间变电所负荷计算及无功功率补偿.................52.3低压变压器的选择与损耗计算...............................82.3.1低压变压器的选择...................................82.3.2各低压变压器的损耗计算.............................92.4主变压器的选择..........................................112.4.2主变压器损耗计算..................................123系统主接线设计...........................................133.1主接线设计的基本要求....................................133.1.1供电电源的确定....................................133.2电气主接线方案的确定....................................133.2.1确定35kV、10kV电气主接线.........................133.2.2供电系统简图......................................144短路电流的计算...........................................154.1短路电流................................................154.1.1短路的原因........................................1524.1.2短路的危害........................................154.1.3短路电流计算的目的................................154.1.4短路电流计算的标幺值法............................154.2计算各元件的电抗标幺值..................................164.2.1选取基准值........................................164.2.2供配电系统中各主要元件电抗标么值..................164.2.3短路电流具体计算短路电路中各主要元件的电抗标么值..174.2.4在最大运行方式下..................................184.2.5在最小运行方式下..................................195变电所高压电气设备的选择与校验...........................215.1.35KV高压开关柜的选择..................................215.1.1短路校验的原则....................................215.2高压设备选择及校验......................................215.2.135KV断路器的选择.................................215.2.235KV隔离开关的选择...............................235.2.335KV电流互感器的选择.............................235.2.435KV电压互感器的选择.............................235.2.535KV熔断器的选择.................................235.2.635KV避雷器的选择.................................245.310KV电气设备的选择.....................................245.3.110KV开关柜的选择.................................245.3.210KV断路器的选择.................................245.3.3隔离开关的选择....................................255.3.4电流互感器的选择..................................255.3.5电压互感器的选择..................................256高压配电线路的设计.......................................266.1高压配电线路接线方式的选择..........................2636.2高压配电线路截面的选择与校验........................266.2.135KV高压进线的选择...............................266.2.2截面积的校验......................................266.2.310KV高压出线线路的选择与校验.....................277防雷与接地设计...........................................297.1防雷保护................................................297.1.1电力线路的防雷措施................................297.1.2变配电所的防雷措施................................297.1.3雷电侵入波的防护..................................307.2接地设计................................................308继电保护的整定计算.......................................318.1继电保护的基本任务及要求................................318.1.1继电保护的基本任务................................318.1.2继电保护的基本要求................................318.2变压器的继电保护设置....................................318.3变电所主变压器继电保护的计算............................328.3.1装设瓦斯保护......................................328.3.2装设定时限过电流保护..............................328.3.3装设电流速断保护..................................338.3.4装设过负荷保护....................................348.3.510kV母线断路器的保护.............................348.3.610kV出线各支路的保护.............................34结论............................................................35致谢............................................................36参考文献........................................................374摘要本设计是为某矿山起重机有限公司设计一座35kV变电所及其配电系统。其内容包括有：1、总降压变电所一次部分的初步设计①变电所主接线方案的确定；②负荷计算及无功补偿容量和补偿方案的确定；③主变压器的选择计算；④短路电流计算；⑤总降压变电所各种高压电气设备的选择；⑥防雷接地的设计。2、高压配电线路的设计①高压配电线路接线方式的确定；②高压配电线路的类型和结构的确定；③导线或电缆截面的选择。关键字：负荷计算；电气主接线；短路计算；电气设备选择；继电保护5ABSTRACTThisdesignforacertainminecraneco.,LTD.Isa35kvsubstationandpowerdistributionsystemdesign.Itscontentsinclude:1,thegeneralvoltagesubstationforpreliminarydesignofapartThedetermineofsubstationmainwiringscheme;(2)theloadcalculationandtheschemeofreactivepowercompensationcapacityandcompensation;(3)thechoiceofmaintransformercalculation;(4)shortcircuitcurrentcalculation;(5)generalvoltagesubstationhigh-voltageelectricalequipmentchoice;6.Thedesignoflightningprotectiongrounding.2,thedesignofhighpressuredistributionline(1)thedeterminationofhighpressuredistributionlineconnectionmode;(2)thetypeofhighpressuredistributionlineandthedeterminationofstructure;(3)thechoiceofwireorcable.Keywords:loadcalculation;Themainelectricalwiring;Shortcircuitcalculation.Electricalequipmentchoice;Relayprotection湖北理工学院毕业设计（论文）11前言1.1毕业设计背景供电工程，就是指工厂所电能的供应和分配，亦称工厂配电。众所周知，电能是现代工业生产的主要能源和动力电能是现代工业生产的主要能源和动力。电能既易于由其它形式的能量转换而来，又易于转换为其它形式的能量以供应用；而电能的输送和分配既简单经济，又便于控制、调节和测量，有利于实现生产过程自动化