变电站课程设计.doc

目 录 前言··············································································（1） 变电所原始资料···························································（2） 变压器的设计······························································（3） 主变压器的选择································································（3） 所用变压器的选择···························································（4） 电气主接线的设计·····················································（5） 电气主接线方案的确定·····················································（5） 变电所的无功补偿························································ （7） 短路电流计算···························································（7） 短路计算的原则···························································（7） 短路电流的计算方法和步骤··············································（7） 短路电流计算结果表······················································（7） 短路电流的计算···························································（7） 短路电流计算列表························································（7） 电气设备的选择······················································（7） 电气设备的选择原则·····················································（7） 电气设备选择的技术条件················································（11） 配电装置的选择······················································（11） 附录1短路电流的计算及程序说明···························（11） 附录2 电气设备的选择··········································（11） 附录3主接线图 ···················································（11） 前 言 电力工业是能源工业、基础工业，在国家建设和国民经济发展中占据十分重要的位置，是时间国家现代化的战略重点。电能是一种无形的、不能大量储存的二次能源。电能的发、变、送、配和用电，几乎是在同一瞬间完成的，须随时保持功率平衡。要满足国民经济发展的要求就必须加强电网建设，而变电站建设就是电网建设中的重要一环。 在变电站的设计中，既要求所变电能能很好地服务于工业生产，又要切实保证工厂生产和生活的用电的需要，并做好节能工作，就必须达到以下基本要求：安全? 在变电过程中，不发生人身事故和设备事故。可靠? 所变电能应满足电能用户对用电的可靠性的要求。优质? 所变电能应满足电能用户对电压和频率等质量的要求。经济? 变电站的投资要少，输送费用要低，并尽可能地节约电能、减少有色金属的消耗量和尽可能地节约用地面积。220KV变电站属于高压网络，该地区变电所所涉及方面多，考虑问题多，分析变电所担负的任务及用户负荷等情况，选择所址，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，从而确定变电站的接线方式，再进行短路电流计算，选择送配电网络及导线，进行短路电流计算。选择变电站高低压电气设备，为变电站平面及剖面图提供依据。本变电所的初步设计包括了：（1）总体方案的确定（2）负荷分析（3）短路电流的计算（4）高低压配电系统设计与