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摘 要:本文简述了高压输电网的设计过程与设计方法。输电网的设计应根据用户的相关需求，各配电变电所的地理位置和电厂的供电情况做出相应的功率计算，确定各变电所变压器的主变容量与台数。根据已有的知识与经验设计出几种备选的方案，通过技术经济比较，选出最佳方案。首先选择导线要考虑到导线的截面，从机械强度、电晕、载流量等方面检验导线，确定导线型号。其次，对各个方案在正常和故障情况下进行电能损耗计算。最后在经济方面，综合各方案的电能损耗，线路投资，变电所投资等比较考虑，根据潮流计算结果对确定的方案评定调压要求，选定调压方案。56868
毕业论文关键词：高压输电网，电能损耗，潮流计算
Abstract: This paper concisely has introduced method and the process of the distribution net design of high voltage. It should be according to the related needs of user loads, each distribution station site and the condition of power supply of existed power plants. Determining every distribution transformer capacity and number. According existed knowledge and experience, imagine kinds choused scheme, compare through technical economy from some allowing aspects, require best design. Firstly, select wire according to economic section, checking the wire on machine mechanical strength, corona, the current-carrying capacity and etc. Besides, various choose schemes must be carried out calculation for normal and fault condition by manual power flow calculation. Last, from loss, line investment, the electrical energy of various scheme lines, distribution system annual operation cost as well as investment of electrical place, carrying out economic comparison and synthesize.
Keywords: High voltage distribution network, electric energy loss, power flow calculation
目 录
1 前言 3
1.1 电网规划的重要性及意义 3
1.2 课题设计目的和要求 4
2 设计任务书 4
2.1 发电厂、变电所地理位置图 4
2.2 各变电所负荷情况 4
2.3 发电厂装机 5
2.4 其他情况 5
3 设计说明书 5
3.1 高压配电网的电压等级和接线方式 5
3.2 有功平衡结果 8
3.3 确定发电厂装机台数 8
3.4 变压器选择结果 8
3.5 交流线路选择 8
3.6 经济指标比较结果 8
3.7 断路器和隔离开关的选择 9
3.8 调压和无功补偿结果 9
3.9 母线型号的选择 10
3.10 发电厂电气主接线图 10
3.11 变电站电气主接线图 11
4 设计计算书 12
4.1 变压器及线路的选择 12
4.2 经济性比较确定最佳方案 18
4.3 选定方案短路电流的计算和开关的选择 21
4.3.1 软件计算短路电流结果