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摘要厂总降压变电所是工厂供配电的重要组成部分，它直接影响整个工厂供电的可靠运行，同时它又是联系发电厂和用户的中间环节，起着变换、接受和分配电能的作用。电气主接线是总降压变电所的主要环节，电气主接线的拟定直接关系着全厂电气设备的选择、配电装置的布置、继电保护和自动装置的确定，是决定变电所电气部分技术经济性能的关键因素。本设计是35/6kV降压变电所及高压配电系统的设计。首先，进行车间负荷统计和无功功率补偿，确定主变压器及各车间变压器；从技术和经济等方面，通过了两种方案的比较，选择经济、可靠、运行灵活的主接线一次方案。其次，进行短路计算和设备的选择、校验；然后，确定工厂电源进线、母线和高压配电线路。最后，进行二次回路方案、整定继电保护、防雷保护和接地装置的设计。设计结果可以满足精益冶金机械修造厂供电的可靠性，并保证各车间电气设备的稳定运行。25596
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关键词：负荷计算；变电所主接线；继电保护
毕业论文设计说明书外文摘要
Title A metallurgical machinery factory total step-down substation and power distribution system design
Abstract:
The total step-down substation plant is an important part of power system.It has a direct impact to reliable operation of the ertire power system of factrory,which is also relates the power plant and user's middle link, plays the role of shifting and assigning electric energy. The host connection directly related to the choice of electrical equipment the layout of power distribution equipment ,and outmatic protection devices identified of the whole plan,which is the key factor deciding substation electrical part technical economy directly.
This design is about 35/6kV step-down high-voltage substation and distribution system. First, it carries on the workshop load statistics and the reactive power compensation, definite main transformer and various workshops transformer; From aspects and so on technology and economy, adopted two kind of plan comparisons, the choice economically, reliable, the movement nimble main wiring first power document. Next, it carries on the short circuit computation and equipment's choice, the verification; Then determines the factory power source coil, the bus bar and the high pressure distribution line. Finally, it carries on the secondary circuit plan, the installation relay protection, the anti-radar protection and the grounding design.
The design result may satisfy the jingyi mechanical repair shop power supply the reliability, and guarantees the various workshops electrical equipment's steady operation.
Key words:Statistic of load; The host connection of substation; Protective relayin
目 次
1 引言1
1.1 工厂供电设计的一般原则2
1.2 原始资料2
1.3 设计的基本内容3
2 负荷计算与无功功率补偿4
2.1 负荷计算的意义4
2.2 计算负荷的确定4
2.3 无功功率补偿和计算7
2.4 本章小结8
3 降压变电所及变压器的选择9
3.1 变配电所所址和形式的选择9
3.2 变压器台数和容量的确定10
3.3 车间变电所变压器选择11
3.4 本章小结12
4 变电所主接线设计13
4.1 变电所主接线方案的设计原则与要求13
4.2 变电所主接线方案选择14
4.3 本章小结15
5 短路电流的计算16
5.1 短路计算的意义16
5.2 短路电流计算的步骤方法16
5.3 短路计算18
5.4 本章小结26
6 一次设备的选择和校验27
6.1 电气设备选择校验的条件与项目27
6.2 一次设备选择与校验过程28