1、 摘摘 要要 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，起着接受和分配电能的作用。其中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。 本设计根据降压变电所及高压配电系统的设计线路， 首先进行车间负荷计算 和无功功率补偿，确定主变压器容量台数及各车间变压器；其次从技术和经济方 面，根据经济、可靠、运行灵活的原则通过了三种方案的比较，确定了单母线分 段供电方式;又进行了厂区 10KV 配电系统设计。再次，进行短路计算；然后，根 据计算结果
2、进行电气设备的选择。最后，进行了整定继电保护、防雷保护和接地 装置的设计。设计结果可以满足精密机械厂供电的可靠性，并保证各车间电气设 备的稳定运行。 关键词：负荷计算, 主接线设计，短路计算，配电装置 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
3、plant and users 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
4、substation electrical part technical economy directly. This design is about 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 co
