某电机修造厂总降压变电所及高压配电系统设计

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摘要

电力行业作为国家经济的命脉之一，无论在工农业建设还是普通民用都扮演着中流砥柱的作用，为社会主义现代建设奠定了坚实的基础。宏观意义电力行业需要通过客观缜密的工厂供配电系统设计体现，这是本设计的价值所在。本设计内容针对郑州某电机修造厂的供配电设计，据任务书要求，通过查阅相关资料文献，运用大学阶段学习成果，通过具体讨论工厂配电系统方案设计的原理，进行总体设计和详细分析说明，包括：负荷计算和无功功率补偿、变电所位置和型式的选择、变电所主变压器台数和容量、类型的选择、变电所主接线方案、短路电流的计算、变电所一次设备的选择与校验、变电所出线的选择、变电所二次回路方案的选择与继电保护的整定、防雷保护与接地装置。以科学严谨的方法完成本设计的内容，达到设计任务书的要求，将电力行业中的单元组成——工厂供配电系统设计反应出来。

关键词： 负荷计算 短路电流计算 主接线方案 继电保护整定 防雷和接地

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目录

ABSTRACT

Power industry as the lifeblood of the national economy, both in industrial and agricultural construction or ordinary civilian plays a pillar of strength for the socialist modernization construction has laid a solid foundation. Macro sense the power industry needs through objective careful plant design reflects the supply and distribution system, which is the design value. The design content for a motor built factory in Zhengzhou for the distribution design, according to the mission statement requirements, access to relevant information through literature, the use of university level learning outcomes, through specific discussion of plant distribution system design principles, design and carry out a detailed analysis of the overall Description, including: load calculation and reactive power compensation, substation location and type selection, and the number of main transformer substation capacity, type of selection, substation main Wiring, short-circuit current calculations, a substation equipment selection and validation, substation outlet choice, substation secondary circuit program selection and tuning protection, lightning protection and grounding devices. Rigorous scientific method to complete the content of this design, to meet the design requirements of the mission statement, the electric power industry in the units - factories reflected supply and distribution system design.

Keywords:Load calculations, short circuit current calculation, Main Wiring, relay setting, lightning protection and grounding

目 录

目录

摘要............................................................... II ABSTRACT........................................................... II 1绪论 .............................................................. 1 1.1工厂供电的目的意义 .............................................. 1 1.2本次设计的任务要求 .............................................. 2 1.3设计资料 ........................................................ 2 1.4工厂平面图 ...................................................... 3 2负荷计算和无功功率补偿 ............................................ 4

2.1负荷计算..................................................... 4 2.1.1负荷计算概述............................................... 4 2.1.2按需要系数法确定计算负荷................................... 4 2.1.3多组用电设备计算负荷的确定................................. 5 2.1.4工厂各车间负荷计算表....................................... 6 2.1.5全厂负荷计算............................................... 6 2.2无功功率的补偿............................................... 7 3变电所参数的确定 ................................................. 10

3.1总降压变电所位置的选择...................................... 10 3.2总降压变电所型式的选择...................................... 12 3.3总降压变电所主变压器台数的选择.............................. 12 3.4总降压变电所主变压器容量的选择.............................. 12 3.5总降压变电所主变压器的选择.................................. 13 4变电所主接线方案的设计 ........................................... 14

4.1变电所主接线方案的设计原则与一般要求........................ 14 4.2变电所主接线的接线方式...................................... 14 4.3变电所主接线图.............................................. 15 5短路电流的计算 ................................................... 16

5.1短路电流计算方法............................................ 16 5.2短路电流计算过程............................................ 17 5.2.1最大运行方式.............................................. 17 5.2.2系统最小运行方式.......................................... 19 5.2.3三相短路电流统计表........................................ 19 6总降压变电所一次设备的选择与校验 ................................. 20

6.1一次设备选择与校验的条件与项目.............................. 20 6.1.1按正常工作条件选择........................................ 20 6.1.2按短路条件校验............................................ 20 6.2 35kV侧一次设备选择与校验................................... 21 6.3 10kV侧一次设备选择与校验................................... 22 6.4 高压开关柜的选择 ........................................... 23 6.5 母线的选择 ................................................. 23 7变电所进出线的选择与校验 ......................................... 24

7.1进出线方式的选择............................................ 24 7.2进出线的选择与校验条件...................................... 24 7.2.1按发热条件选择导线和电缆的截面............................ 24