变电站毕业设计

摘要

变电所是电力系统的一个重要组成部分，由电器设备和线路按一定的接线方式所构成，他从电力系统取得电能，通过其变换、分配、输送与保护等功能，然后将电能安全、可靠、经济的输送到每一个用电设备的转设场所。变电所供配电设计需要考虑很多方面，分析变电所担负的任务及用户负荷等情况.利用用户数据进行负荷计算，确定用户无功功率补偿装置。同时进行各种变压器的选择，从而确定变电所的主接线方式，再进行短路电流计算，选择导线，选择变电所高低压电气一次设备等。本文详细介绍了某矿35kV 变电所的设计。文中对主接线的选择、高压设备的选择、负荷计算、短路电流计算，各种继电保护选择和整定计算皆有详细的说明。特别对主接线的选择，变压器的选择，还有一些电气设备如断路器、电流互感器、电压互感器等的选择校验作了详细的说明和分析。依据供电规则，着重解决了负荷统计、变电所主结线方案的选择、进出线的选择、变电所所址的选择、主变压器的台数和容量的选择、短路计算及开关设备的选择、防雷保护与接地装置的设计等问题，并结合地区的供电规则和工程实际情况选择出最合适的方案及参数、各种设备型号及容量。其中还对变电所的主接线，平面布置等通过CAD制图直观的展现出来

关键词：负荷计算: 电气主接线设计: 短路电流计算: 防雷

Abstract

Substation is an important part of power system, the electrical equipment and lines at a certain wiring posed, he obtained power from the power system, through its transformation, distribution, transportation and protection function, then electric energy safe, reliable, and economical transport to each a used electric equipment set places. Transformer for distribution design need to consider many aspects, analysis of substation and tasks such as user load. The use of user data load calculation, to determine the reactive power compensation device users. At the same time, the choice of various transformers, so as to determine the substation main wiring mode, and then short-circuit current calculation, select the wire, select substation high and low voltage electrical once equipment, etc. This paper describes the 35 kV of a mine down the substation design. In the main connection of choice, the choice of high-voltage equipment, load calculation, short-circuit current basis, the protection of various options and setting calculation there are detailed instructions. In particular the choice of the main cable, transformers choice, there are some electrical equipment such as circuit breakers, current transformers, high voltage transformer, and so the choice of checking a detailed description and analysis. rules based on power supply, focus on resolving a load statistics, the mainline for selection, choice, the choice of the site by the substation, the main capacity and the number of Taiwan's choice, short-circuit calculation and the choice of switching equipment , Relay and the choice of setting, lightning protection and grounding equipment design and other issues, combined with the power of the actual situation of rules and choose the most appropriate solutions and various models and equipment capacity. It also substation on the main wiring, layout, adjacent to the high number of low-voltage protection devices, such as through the CAD

drawing intuitive shown.

Key words: load calculation: main electric wiring design: short-circuit current calculation: mine: relay