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摘 要: 电能是人民社会生活不可缺少的能源,由其随着经济的发展和人民生活水平的提高,对供电质量的要求日益加增。而变电所是电力系统的重要组成部分,它是变换和调整电压、变换和分配电能的场所,往往担负着向用电设备直接供电的任务。因此变电站的安全可靠运行对整个电力系统的影响甚大,对变电所的研究设计也就成为一项重要的任务。65481
本次设计的变电所是高压侧为6kV,低压侧为0.4kV的终端变电所配电系统和保护系统。本设计通过对拟建变电所的调研以及对负荷资料的分析,从安全性、可靠性及经济性方面考虑,确定变电所主接线方式。通过负荷计算及供电范围确定主变压器台数、容量及型号,并且通过计算损耗与补偿选择电容器。又根据短路电流计算的结果,对高低压断路器,隔离开关,电流互感器、电压互感器,母线进行选型,从而完成此次设计。
毕业论文关 键 词: 变电所, ,负荷计算,短路电流计算
Abstract：Electrical energy is an indispensable energy to people’s social life. Especially with the development of economy and the improvement of people’s living standards, the requirement of power quality is increasing. Transformer substation is an important part of power system. It is a place which works to transform and adjust voltage and also transform and distribute electrical energy. So it often assumes the task of delivering power directly to the electric equipment. Therefore, safe and reliable operation of the substation has great influence on the whole power system and the study of the substation design has become an important task.
The design of transformer substation for this time is for high voltage side and for low side. The main lines are determined by investigating the substation to be set up and analyzing the concerning load data (including its security, economy, and reliability).And, the number, capacity and type of the main transformer are made certain through the load calculation and the power supply range. Meanwhile, select suitable capacitor tank by calculating loss and the compensation. In the end, high and low voltage breaker, isolator switches, bus-bar, voltage transformer and current transformer can be selected, according to the results of calculating of the maximum work electric current and short circuits. Then the design is completed.
Keywords: substation, , load calculation, short circuit current calculation
目 录
1 绪论 4
1.1 选题的背景及意义 4
1.2 设计的主要研究内容 4
2 变电所的原始资料 4
2.1 变电所的电源情况 4
2.2 负荷情况 5
2.3 自然情况 5
3 负荷计算及变压器的选择 5
3.1 负荷计算 5
3.2 各车间变电所的无功补偿及变压器的选择 7
3.3 车间变电所的位置选择 11
3.4 电气主接线的选择 13
4 变电所短路电流计算 14
4.1 短路故障的原因 14
4.2 短路故障的危害 15
4.3 短路电流计算的目的