电力工业是国民经济的基础,是重要的支柱产业,它与国家的兴衰和人民的安康有着密切的关系.220kV变电站是我国当前电网系统中的主要节点,具有容量大,占地小,投资相对经济等优点.
Power industry is the foundation of national economy, an important pillar industry, it and the rise and decline of the state and the people of Ankang have a close relationship. 220kV substation is our current power system in the main node, with large capacity, small occupation of land, investment and other economic advantages.
出于这几方面的考虑,本论文设计了一个220kV降压变电站,此变电站有两个电压等级,一个是66kV,一个是10kV.本设计包括负荷计算、变压器选择,电气主接线设计、短路计算以及电气设备的选择；根据设计的实际情况,首先采用需要系数法进行负荷资料分析计算,根据负荷计算结果,选择了两台变压器,采用暗备用并列运行方式运行；综合考虑主接线的经济性和可靠性等方面因素,确定220kV侧采用内桥的接线形式,66kV采用双母分段的接线形式；采用标幺值法计算短路电流,根据短路电流计算结果选择高电气设备并进行动稳定性校验和热稳定性校验；采用避雷针防止变电所受直击雷破坏,采用避雷器防止变电所受感应雷破坏；变压器设置了气体保护、纵差动保护、过电流保护等继电保护装置.
Out of this a few aspects into consideration, this paper designs a220kV step-down substation substation, the two voltage levels, one is 66kV, is a10kV. This design including the load calculation, the choice of transformers, electrical main wiring design, short-circuit calculation and the choice of electrical equipment; according to the design of the actual situation, first using need coefficient method to load data analysis, load according to the calculation results, choose two transformers, using dark alternate parallel operation mode; considering the main wiring in the economy and reliability and other factors, determine the 220kV side with inner bridge connection forms,66kV dual bus section connection forms; the per-unit value method for the calculation of short-circuit current, according to the calculation result of short circuit current selection for high electrical equipment in verification of stability and thermal stability check action; the lightning arrester to prevent substation by lightning strike destruction, the arrester to prevent substation transformer damage by lightning induction; equipped with a gas protection, differential protection, over current protection relay protection device.
在设计过程中,对主接线、电气设备、无功补偿装置、继电保护装置等力求做到运行可靠,操作简单、方便,经济合理,具有扩建的可能性和改变运行方式时的灵活性,使其更加贴合实际,更具现实意义.
In the design process, the main wiring, electrical equipment, reactive compensation device, relay protection device and strive to achieve reliable running, simple operation, convenient, economical and reasonable, has the potential for expansion and change the operation mode flexibility, make it more practical, more realistic.
