变电所电气一次系统设计电子版本科论文.docVIP

变电所电气一次系统设计 摘要 变电所是电力系统的重要组成部分，。城市供电系统的核心部分是变电所。因此，设计和建造一个安全、经济的变电所，是极为重要的。本变电所设计除了注重变电所设计的基本计算外，对于主接线的选择与论证等都作了充分的说明，其主要内容包括：变电所主接线方案的选择，进出线的选择；变电所主变压器台数、容量和型式的确定；短路点的确定与短路电流的计算，电气设备的选择（断路器，隔离开关，电压互感器，电流互感器，避雷器）；配电装置设计和总平面布置；防雷保护与接地系统的设计。另外，绘制了张图纸，包括：电气主接线图，电气总平面布置图，，110kV接线断面图，35kV接线断面图10kV接线断面图。图纸规格与布图规范都按照了电力系统相关的图纸要求来进行绘制。 关键词：变电所；电气主接线；电气设备；设计 A DESIGN OF ELETRIC SYSTEM FOR STEP-DOWN TRANSFORMER SUBSTATION Abstract Electricity substation is an important component of the system is composed of one basic unit of the grid, its operation is safe or not directly related to the power grid safety and stability of the national economic and social development. The core of city for supplying power is transformer. It is very important to design and build one safe and economical transformer substation. Besides paying attention to basic calculation of design for transformer substation, the design make satisfying narration toward choice and argumentation of main connection. The main content of this design include the choice of main connection for transformer substation; the choice of pass in and out line; the certainty of number, capacitance and model for main transformer; the certainty of short circuit points and calculation of short circuit; the choice electric equipment(breaker, insulate switch, voltage mutual-inductance implement, current mutual-inductance implement, arrester, insulator and wall bushing); the design for distribution and disposal for chief plane; the design for lightning proof protection and earth system. In addition, drawing seven CAD blueprints, include the main wiring diagram: the disposal drawing of electric plane; the drawing of lightning proof protection and earth system; the drawing of 110kV connection; the drawing of 35kV connection; the drawing of 10kV connection. Both the specification of drawing and the criterion of disposal is based on requirement of drawing to electric power system. Keywords: Transformer substation; Main connection; Ele