110kV 降压变电站一次系统设计计算书.doc

1、目 录摘要IAbstractII引言11 电气主接线方案的选择11.1 电气主接线设计11.1.1 主接线的设计原则11.1.2 主接线的设计要求11.1.3 拟定主接线方案21.1.4 原始资料41.1.5 拟定方案51.2 电气主接线方案的确定51.2.1 主接线方案的可靠性比较51.2.2 主接线方案的灵活性比较71.2.3 主接线方案的经济性比较71.2.4 主接线方案的确定72 变压器的确定82.1 主变压器容量、台数及型号的选择82.1.1 主变压器的选择82.2 所用变压器容量、台数及型号的选择102.2.1 所用变压器台数及容量的确定102.2.2 所用电源引接方式112.2.

2、3 所用变的选择113 短路电流计算113.1 短路电流计算的目的113.2 短路电流计算的一般规定123.2.1 计算的基本情况123.2.2 接线方式123.2.3 计算容量123.2.4 短路种类123.2.5 短路计算点123.3 短路电流计算123.3.1 选择计算短路点123.3.2 画等值网络图123.3.3 计算124 设备的选择与校验164.1 设备选择的原则和规定164.1.1 设备选择的一般原则164.1.2 设备选择的有关规定174.2 导线的选择和校验174.2.1 导线的选择174.2.2 导线的校验194.3 断路器的选择和校验194.3.1 断路器选择的技术条件

3、194.3.2 断路器型式和种类的选择214.3.3 断路器的选择和校验214.4 隔离开关的选择和校验224.4.1 隔离开关的选择及校验原则224.4.2 隔离开关的选择及校验234.5 互感器的选择及校验244.5.1 电压互感器的选择244.5.2 电流互感器的选择244.5.3 电流互感器的校验254.6 避雷器的选择及校验264.6.1 型式264.6.2 金属氧化物避雷器选择原则265 屋内外配电装置设计275.1 配电装置的设计要求275.1.1 配电装置应满足的基本要求275.1.2 配电装置的安全净距285.2 配电装置的选型、布置285.2.1 屋外配电装置选择原则285

4、.2.2 屋外配电装置选择295.2.3 10kV屋内配电装置选择296 防雷及接地系统设计296.1 防雷系统296.1.1 hx=11m的保护范围296.1.2 hx=7m的保护范围306.2 变电站接地装置316.2.1 接地装置要求316.2.2 接地网的扁钢尺寸要求316.2.3 接地装置选择317 变电站总体布置317.1 总体规划317.2 总平面布置317.2.1 总平面布置的主要内容317.2.2 总平面布置的基本原则31参考文献33致谢34附录35II ContentsAbstractIIIntroduction11 The choice of electrical mai

5、n wiring scheme11.1 Electrical main wiring design11.1.1 Design principle of main wiring11.1.2 Main wiring design requirements11.1.3 Main wiring scheme21.1.4 Source41.1.5 Plan51.2 Determination of electrical main wiring scheme51.2.1 Reliability comparison of main wiring scheme51.2.2 The flexibility o

6、f main wiring scheme71.2.3 Economic comparison of main wiring schemes71.2.4 Determination of main wiring scheme72 Determination of transformer82.1 The main transformer capacity and number and type selection82.1.1 Selection of main transformer82.2 Volume, number and types of transformer used in the c

7、hoice of102.2.1 By determine the number and capacity of transformers102.2.2 Lead connection mode112.2.3 Variable selection used113 Calculation of short-circuit current113.1 The purpose of short-circuit current calculation113.2 General rules for calculation of short-circuit current123.2.1 Basic situa

8、tion of calculation123.2.2 Connection mode123.2.3 Computational capacity123.2.4 Short-circuit type123.2.5 Short-circuit calculation point123.3 Calculation of short-circuit current123.3.1 Select the short-circuit point123.3.2 Drawing equivalent network diagram123.3.3 Calculation124 Selection and veri

9、fication of equipment164.1 The principle and regulations of equipment selection164.1.1 General principles for equipment selection164.1.2 The relevant provisions of the choice of equipment174.2 Wire selection and verification174.2.1 Wire selection174.2.2 Calibration of wire194.3 Selection and verific

10、ation of circuit breaker194.3.1 Technical conditions for selecting circuit breakers194.3.2 Choice of type and type of circuit breaker214.3.3 Selection and verification of circuit breaker214.4 Isolation switch selection and verification224.4.1 Isolation switch selection and calibration principle224.4

11、.2 Isolation switch selection and verification234.5 Selection and verification of transformer244.5.1 The choice of voltage transformer244.5.2 The choice of current transformer244.5.3 Calibration of current transformer254.6 Selection and verification of arrester264.6.1 Type264.6.2 Metal oxide arreste

12、r selection principle265 Design of power distribution equipment inside and outside the house275.1 Distribution equipment design requirements275.1.1 Basic requirements for distribution equipment275.1.2 Distribution device security clearance285.2 Distribution equipment selection and layout285.2.1 Sele

13、ction principle of distribution equipment outside the house285.2.2 Outdoor distribution equipment selection305.2.3 10kV power distribution device selection306 Lightning protection and grounding system design296.1 Lightning protection system296.1.1 Hx=11m protection range296.1.2 Hx=7m protection rang

14、e306.2 Substation grounding device316.2.1 Earthing device requirements316.2.2 Grounding flat size requirements316.2.3 Earthing device selection317 Substation general layout317.1 Overall planning317.2 General layout317.2.1 Main contents of total plane layout317.2.2 Basic principles of general layout31Reference33Thank34Appendix35110KV降压变电站一次系统设计摘要：本文是对110kV 变电站电力系统进行总体分析，然后进行计算和初步设计，确定了变电站电气一次系统主接线的形式。该变电站设有两台主变压器，站内主接线分为 110kV、35kV 和 10kV 三个电压等级。本次设计进行了电气主接线的设计和选择、短路电流计算、主要电气设备选择及校验（包括断路器、隔离开关、互感器、避雷器等）、各电压等级配电装置设计、防雷保护接地系统设计和变电站总体布置。本设计以电力工程电气设计手册、35110kV高压配电装置设计规范等规范规程为依据，设计的内容符合国家有关经济技术政策