毕业设计--35_6kV降压变电所及高压配电系统的设计

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1、摘要 I 摘要 工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 主结线是总降压变电所的主要环节，电气主结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、运行灵活的主结线一次方案。其次，进行短路计算和设备的选择、 校验；然后，确

2、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。 设计结果可以满足冶金企业供电的可靠性，并保证各车间电气设备的稳定运行。 关键词：负荷计算；变电所主结线；继电保护 Abstract II Abstract The total step-down substation plant is an important part of power system. It has a direct impact to reliable operation of the entire power system of factory, and it is a

3、lso a middle link which relates the power plant and users, 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 identification of automated protection devices of the whole

4、plan, which is the key factor deciding substations electrical part in technical and economy performance directly. This design is about 35/6kV step-down high-voltage substation and distribution system. First, it calculates the workshop load statistics and the reactive power compensation, definites ma

5、in transformer and various workshops transformer; In technology and economy aspects and so on ,it adopts two plan to be compared, and makes a good choice which is a economically, reliable and nimble main wiring scheme. Next, it carries on the short circuit computation, equipments choice and the veri

6、fication; 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 a certain metallurgical enterprise power supply, and guarantees the various workshops electrical equipments steady operation. Key words: Load calculation; Substation main wiring; Relay protection 目录 1 目 录 摘要 I Abstrac