供用电技术专业论文42169.doc

　　　　　　 题　　　目　110kV变电所电气一次部分初步设计 并列英文题目110kV electrical substation part of the preliminary design of a　　　　　　　　　　　　 系　　部　电气工程系　　 　 专业　供用电技术　　 摘 要 变电站是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济运行，是联系发电厂和用户的中间环节，起着变换和分配电能的作用。电气主接线是发电厂变电所的主要环节，电气主接线的拟定直接关系着全厂（所）电气设备的选择、配电装置的布置、继电保护和自动装置的确定，是变电站电气部分投资大小的决定性因素。 本次设计110kV变电所电气一次部分初步设计，首先，根据主接线的经济可靠、运行灵活的要求选择各个电压等级的接线方式，在技术方面和经济方面进行比较，选取灵活的最优接线方式。 其次进行短路电流计算，根据各短路点计算出各点短路稳态电流和短路冲击电流，从三相短路计算中得到当短路发生在各电压等级的工作母线时，其短路稳态电流和冲击电流的值。 最后，根据各电压等级的额定电压和最大持续工作电流进行设备选择，然后进行校验。 Abstract Electricity substation is an important component of the system, it will directly affect the power system security and economic operation of power plants are linked and users of intermediate links, transformation and distribution of power plays a role. The main electrical power plant substation wiring is the main link in the main electrical wiring directly related to the development of the whole plant (by) the choice of electrical equipment, power distribution equipment layout, relay protection and automatic device identification, is part of the electrical substation the decisive factor in the size of investment. The design of a 110kV electrical substation part of the preliminary design, first of all, according to the main terminal of the economic and reliable operation of all flexibility to choose the connection mode voltage, in the technical aspects and economic aspects of comparison, the flexibility to select the optimum connection mode . Secondly, to carry out short-circuit current calculation, according to point out the short-circuit short-circuit all the impact of steady-state current and short circuit current, calculated from the three-phase short-circuit when the circuit has been occurring in the work of the bus voltage, the steady-state current and the impact of short-circuit current value. Finally, in accordance with the voltage level of the rated voltage and maximum continuous operating current equipment choice, and then proceed to check. 前言 经过三