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随着国民经济的快速发展,人们对电力的需求越来越多,变电站在电力传输系统中具有非常重要的作用,因为它在整个传输系统中起到变换电压,并进行再次分配及控制的作用,保障人们生活用电的需求。由于变电站在电力传输网的重要作用,它的功能对电网的可靠性有着决定性的影响,直接关乎着整个电网运行的稳定。
变电所是电力系统极其重要的组成部分,其合理设计与建设可以保证供电的可靠性和满足远期负荷的要求。本次设计以甘谷220kV地方降压变电所设计以生产实际为依据，以变电所的最佳运行状态为基础，系统的阐明220kV变电所设计的基本方法和步骤，经过多方面的校验，是满足实际生产需要的一套最优设计方案。变电所的电压等级为220/110/10kV，220kV是本变电所的电源电压，110kV和10kV是二次电压。
本变电站设计除了注重变电站设计的基本计算外，对于主接线的选择与论证等都作了充分的说明，其主要内容包括：变电站主接线方案的选择，进出线的选择；变电站主变压器台数、容量和型式的确定；短路点的确定与短路电流的计算，电气设备的选择（断路器，隔离开关，电压互感器，电流互感器，避雷器）；防雷保护与潮流分析的设计。
关键词：变电所；负荷计算；短路电流；设备选择；潮流分析
With the rapid development of national economy, people demand more and more electric power, substation plays a very important role in power transmission system, because it plays the role of switching voltage in the whole transmission system, and redistributes and controls, so as to ensure the demand of people's living electricity. Because of the important role of substation in power transmission network, its function has a decisive influence on the reliability of power network, which is directly related to the stability of the whole power network operation.
Substation is an extremely important part of power system, and its reasonable design and construction can ensure the reliability of power supply and meet the requirements of forward load. This design is based on the actual production, the optimal operating state of the substation, and the basic methods and steps of the 220 kV substation design are expounded systematically. After many checks, it is an optimal design scheme to meet the actual production needs. The voltage level of the substation is 220/110/10 kV,220kV is the supply voltage of this substation, and 110 kV and 10 kV are secondary voltage.
In addition to paying attention to the basic calculation of substation design, the main contents of the substation design are fully explained, including: the selection of the main connection scheme of the substation, the selection of the incoming and outgoing lines; the determination of the number, capacity and type of the main transformer; the determination of short-circuit points and the calculation of short-circuit current; the selection of electrical equipment (circuit breaker, isolating switch, voltage transformer, current transformer, lightning arrester); the design of lightning protection and power flow analysis.
Keywords: substation; load calculation; short circuit current; equipment selection; power flow analysis
目 录
6.2.3 1、4号变电所负荷以2%的比例下降，2、3号变电所负荷以2%的比例增加59
6.2.4 轮流断开支路双回线中的一条时的潮流计算及分析62
