新北区希望化工厂35kV总降变电所计算书.doc

1、目 录摘要IAbstractII引言11 原始资料11.1 资料内容11.2 设计任务21.3 设计成果22 负荷计算、无功补偿以及主变压器的选择22.1 负荷计算22.1.1 有功总负荷22.1.2 无功总负荷22.1.3 视在功率22.1.4 功率因数22.2 无功补偿22.2.1 需补偿的无功功率32.2.2 无功补偿设备32.3 重要负荷32.4 变压器的选择32.4.1 主变压器台数32.4.2 变压器容量32.4.3 绕组数和接线组别的确定42.4.4 调压方式的选择42.4.5 冷却方式的选择42.4.6 变压器的容量42.4.7 变压器的型号43 所用电接线设计和所用变压器的选

2、择53.1 所用变容量与台数的确定53.2 所用电接线方式54 电气主接线的选择54.1 设计的基本要求64.2 设计主接线的原则64.3 方案的比较64.3.1 35KV侧的接线64.3.2 6KV侧的接线75 短路电流计算75.1 短路电流计算的目的75.2 短路计算75.3 短路计算参数表96 主要电气设备的选择及校验96.1 35kV母线的选择与校验96.2 35kV高压断路器的选择与校验106.3 35kV隔离开关的选择与校验116.4 35kV电流互感器的选择与校验126.5 35kV及6kV电压互感器的选择与校验136.6 高压开关柜的选择136.7 6kV开关柜的选择136.7

3、.1 开关柜型号136.7.2 开关柜所配母线136.7.3 开关柜所配断路器146.7.4 开关柜所配电流互感器156.8 6kV负荷配出线选择176.8.1 1#出线176.8.2 2#出线176.8.3 3#出线186.8.4 4#出线186.8.5 水源变电所196.8.6 生活区变电所196.8.7 锅炉变电所206.8.8 污水处理电源207 变电所的接地规划207.1 接地电阻207.2 接地装置计算218 变电所的防雷保护规划228.1 直击雷的过电压保护228.2 雷电侵入波的过电压保护228.3 避雷器的配置229 继电保护和自动装置的规划设计239.1 继电保护的配置23

4、9.1.1 变压器的保护239.1.2 母线保护259.1.3 线路保护269.2 自动装置的配置289.2.1 配置原则289.2.2 本变电所自动装置配置28参考文献29致谢30ContentsAbstractIIIntroduction11 The original material11.1 Information content11.2 Design task21.3 Design results22 Load calculation, reactive power compensation, and the choice of the main transformer22.1 Loa

5、d calculation22.1.1 Active total load22.1.2 Total load reactive power22.1.3 Apparent power22.1.4 The power factor22.2 Reactive power compensation22.2.1 Need to compensate reactive power32.2.2 Reactive power compensation equipment32.3 Important load32.4 The selection of the transformer32.4.1 The main

6、 transformer stations32.4.2 Transformer capacity42.4.3 The determination of winding number and connection group42.4.4 The choice of the ways of regulating42.4.5 The choice of the ways of cooling42.4.6 The capacity of transformer42.4.7 The model of the transformer43 The electricity wiring design and

7、the choice of transformer is used53.1 The determination of variable volume and the Numbers53.2 The electricity connection mode54 The choice of the main electrical wiring64.1 The basic requirement of design64.2 The principle of design of main wiring64.3 Scheme comparison64.3.1 The connection of 35 kv

8、 side64.3.2 The connection of 6 kv side75 Short circuit current calculation75.1 The purpose of short-circuit current calculation75.2 Short circuit calculation85.3 Short circuit calculation parameter table96 Main electrical equipment selection and calibration96.1 35 kv bus bar of choice and check96.2

9、 The choice of 35 kv high voltage circuit breaker and check116.3 35 kv disconnecting switch, selection and verification126.4 35 kv current transformer selection and calibration136.5 The choice of 35 kv and 6 kv voltage transformer and check136.6 The choice of the high voltage switch cabinet146.7 The

10、 choice of 6 kv switch cabinet146.7.1 Switch cabinet type146.7.2 Switchgear by bus146.7.3 Distribution circuit breaker switch cabinet156.7.4 With current transformer switchgear166.8 6 kv load distribution for choice186.8.1 1 # line186.8.2 2 # line196.8.3 3 # line196.8.4 4 # line196.8.5 Water substat

11、ion206.8.6 The living quarters substation216.8.7 Boiler substation216.8.8 Sewage treatment power227 Substation grounding plan227.1 Grounding resistance227.2 Grounding device to calculate238 The substation lightning protection planning238.1 Direct lightning overvoltage protection238.2 Lightning invas

12、ion wave overvoltage protection238.3 The configuration of surge arrester239 The planning and design of relay protection and automatic device239.1 The relay protection configuration239.1.1 The protection of the transformer249.1.2 Bus protection269.1.3 Line protection279.2 Automatic device configurati

13、on299.2.1 The configuration principle299.2.2 The substation automatic device configuration29References30Acknowledgement31II新北区希望化工厂35kV降压变电所设计摘要 变电站是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济运行，是联系发电厂和用户的中间环节，起着变换和分配电能的作用。电气主接线是发电厂变电所的主要环节，电气主接线的拟定直接关系着全厂（所）电气设备的选择、配电装置的布置、继电保护和自动装置的确定，是变电站电气部分投资大小的决定性因素。本次设计建设一

14、座35KV降压变电站，首先，进行负荷计算并进行无功补偿，选择合适型号的变压器和厂用变压器，根据经济可靠、运行灵活的要求提出多种不同电压等级下主接线形式的方案，在技术方面和经济方面进行比较，最终选取灵活的最优接线方式。其次进行三相短路电流计算，分别得出各短路点的短路稳态电流和短路冲击电流的值。然后，根据各电压等级的额定电压和最大持续工作电流进行设备选择，然后依据短路计算结果进行动稳定性与热稳定性校验。最后对接地进行规划，对防雷进行设计，对继电保护进行简要说明。关键词：变电站 变压器 短路电流 接地防雷The new north district hope chemical plant, 35 kv step-down substation designAbstract Substation is an important part of power system, it directly affect the safety and economic operation of the whole power system, is contact power plants and users of the intermediate links, plays a transformation and distribution o