110KV上秦变电站电气部分及其站用电初步设计_毕业设计.doc

摘 要 Abstract With the rapid development of the national economy, Chinas rapid growth in electricity demand. Make power grids structure have been expanding more and more complex substations for electric power production and distribution play an increasingly important role. Substation is veryimportant technical aspect of a power grid construction and transformation of electrical networks. In recent years, the technology of substation is in the process of rapid development with domestic and international gas-insulated metal-enclosed switching equipment systems and integrated automation technology(GIS) applications, the city substation in a small footprint, flexible, easy to overhaul the trend of development. We have to design primary power-system of 110kV substation and draw main electrical one-line diagram and others. There are two main transformer in the substation ,in which main electrical connection can be divided into two voltage grades: 110kV, 10kV.There is also a design for main electrical connection in this engineering, the calculation for short-circuit electric current, the selection of electrical device and calibration (including circuit breaker, isolator, current transformer, potential transformer, bus bar etc.) and the design for distribution installation per. voltage grade. Key words: substation main electrical connection short circuit currents 目 录 摘 要 I Abstract II III 1 前言 1 1.1 选题的目的和意义 1 1.2 国内外研究综述 1 1.3原始资料 2 1.3.1毕业设计（论文）的技术背景和设计依据 2 1.3.2毕业设计（论文）的主要内容、功能及技术指标 3 2电气主接线设计 5 2.1 概述 5 2.2主接线设计方案 7 2.2.1 110kv侧主接线 7 2.2.2 35kv侧主接线 9 2.2.3 10kv侧主接线 12 2.3无功补偿方案 13 2.3.1 补偿作用 13 2.3.2无功补偿容量及电容器接线方式 13 3 变压器的选择 15 3.1主变压器的选择 15 3.2站用变电器的选择 16 4 短路电流 18 4.1短路电流介绍 18 4.1.1 短路电流计算的目的 18 4.1.2 短路电流计算的一般规定 18 4.1.3短路计算基本假设 18 4.2短路电流计算步骤 19 4.3短路电流计算及计算结果 20 5 导体和电气设备的选择 26 5.1电气设备选择原则 26 5.2断路器和隔离开关的选择 26 5.2.1 110kv侧断路器和隔离开关选择 26 5.2.2 35kv侧侧断路器和隔离开关选择 28 5.2.3 10kv侧断路器的选择 30 5.2.4 主变中性点隔离开关的选择 31 5.3 互感器的选择 32 5.3.1 电流互感器的选择 32 5.3