《学校教学楼变电所初步设计》毕业学术论文.doc

PAGE lw 摘要 根据变电站电气部分课程的要求，为了让同学们能够更好的掌握电气部分的发电、变电、输电、主系统的构成、设计和运行的基本理论及计算方法、并注重加强对电气设备性能和原理灵活应用于实践，培养自己的分析 和计算能力，特此制定出了该毕业设计。 本设计的主要内容包括：变电所主变压器选择；变电所电气主接线设计；短路电流计算；负荷计算；无功功率补偿；电气设备选择（母线、高压断路器、隔离开关、电流互感器、电压互感器、避雷器和补偿电容器）；配电装置设计；继电保护规划设计；接地保护设计等。 根据电气主线设计应满足可靠性、灵活性、经济性的要求，本变电所电气主接线的高压侧采用单母线接线，低压侧采用单母线分段的电气主接线形式；对低压侧负荷的统计计算采用需要系数法；为减少无功损耗，提高电能的利用率， 本设计进行了无功功率补偿设计，使功率因数从0.69提高到0.9；短路电流的计算包括短路点的选择及其具体数值计算；而电气设备选择采用了按额定电流选择，按短路电流计算的结果进行校验的方法；继电保护设计主要是对变压器进行电流速断保护和过电流保护的设计计算；配电装置采用成套配电装置；本变电所采用接地保护。 本设设计采用我国电气设计先进的设备和技术，实用性和应用性及强，并且通俗易懂。 关键词：变电所设计；电气主接线；继电保护 Abstract According to the electrical substation part of the course requirements, in order to enable students to better master the electric part of power generation, substation, power transmission, the main system structure, the design and operation of the basic theory and calculation method, and pay attention to the enhancement of the performance of electrical devices and the principle of flexible application in practice, raises own analysis and computation ability, hereby draw up the graduation design. The design of the main contents include: the choice of main transformer substation; electrical substation main wiring design; short-circuit current calculation; load calculation; reactive power compensation; electrical equipment (bus, high voltage circuit breaker, isolating switch, current transformer, voltage transformer, arrester and capacitor); distribution device for relay protection design; planning and design; lightning protection design. According to the electric main line design should meet the reliability, flexibility, economy, the electrical substation main wiring of high voltage side by a single bus wiring, low voltage side of the single bus sectionalizing electrical main wiring forms; the statistics of low voltage side load calculation using need coefficient method; to reduce reactive loss, improve electric energy utilization rate, the design of reactive power compensation des