毕业设计---发电厂主接线的初步设计.docVIP

摘 要 本次毕业设计根据原始资料进行一个发电厂主接线的初步设计，并对其一次设备进行选择。进而对继电保护进行规划和对配电装置进行规划。设计主要内容包括：电气主接线设计、厂用电接线设计、开关站配电装置平面布置设计及电气二次部分规划等。 电气主接线是发电厂的主要环节，因此本设计对数个电气主接线方案进行了技术和经济比较，确定一个最优方案，并根据此方案对全电气设备的选择、配电装置的布置、继电保护。 短路电流 电气设备 配电装置 继电保护 ABSTRACT The graduation project for the preliminary design of the main wiring of a power plant, according to the original data and to select a deVice. Thus protection planning and the planning of power distribution equipment. The design of the main contents include: the main electrical wiring design,auxiliary power wiring design, layout design of switch station power distribution unit and secondary electrical part of the planning and so on. The main electrical wiring is the main part of the power plant, the design of electrical wiring program of technical and economic, to determine an this program, the layout of the power distribution unit protection planning, detailed design and description. This design is divided into two parts: the first part of the design specification, the specification describes the main connection in the form selected models of electrical equipment, technical parameters, protection planning, power distribution unit planning. The second part is the design calculations, the calculation of the book is the main point of the selected short-circuit short-circuit current calculation, equipment selection and Validation, as well as protection setting calculation. 【ey words】：electrical main wiring ,short-circuit current , electrical equipment, the power distribution equipment ,relay protection 图1-1 单元接线 方案二：扩大单元接线 图1-2 扩大单元接线 方案比较如下表所示： 表1-1 定性比较 方案 方案一 方案二 优点 接线简单，开关设备少，操作简便，故障可能性小，可靠性高，配电装置结构简单，占地少，投资省 可减少变压器和断路器的台数，节省配电装置的占地面积，投资小 缺点 单元中任一元件故障或检修影响范围大，不够经济 用于机组数比较多时，且易受设备选择的困难 由于本次设计的是中小型水电厂，又没有近区负荷，通常考虑用单元接线。综上比较，方案一中采用单元接线，投资大了点，多用了两台变压器，但本次设计机组数目较少仅有4台，用单元接线很适合。而方案二采用扩大单元接线，投资小，但用于机组数比较多时，且易受设备选择的困难。综合比较采用方案一较适合。 1.3 方案接线方式的