地区降压变电所二次部分设计正文.doc

地区降压变电所二次部分设计 摘 要 本文针对变电所主变压器的二次部分设计，以数字式继电保护为基本出发点进行以下了内容的设计。运用所学到知识进行短路电流计算和各种整定计算。从而确定继电保护和自动装置的参数并给出定值，从而选择合适型号的保护装置，以求出在配置和整定值上满足对主变保护选择性、灵敏性和可靠性要求，使继电保护装置充分发挥作用，保障电气设备的安全，保证电力系统的稳定运行。利用matlab软件对低频减载仿真建模，总结各电气量的特性，从而得出仿真是可行与正确的。 电力系统在运行中，失去频率稳定性的后果是系统发生频率崩溃，引起系统全停电，事实证明这是值得我们继保人员深思的。因此要保证低频减载装置正常动作，维持频率稳定，确保电力系统有功功率供需平衡。 进行变电所主变的二次部分设计，力求做到标准性与先进性并存。对待设计的变电所以微机自动化原则为核心指导。目前变电站自动化的模式有集中式结构、分布式结构和分布分散式结构 3种。目前新建的变电站大部分采用的是分布分散式结构，典型结构分为：管理层、间隔层以及设备层。 关键词 变电所，二次部分设计，matlab，低频减载 Two Part Design of the Area of Substation Abstract In this paper, the two parts of the main transformer substation design, digital relay protection as the basic starting point for the design of the contents of the following. The short circuit current calculation and various setting calculation of the knowledge used in the application of knowledge. To determine of relay protection and automatic device and gives the parameter value, so as to select the appropriate type of protective device, in order to find out in the configuration and tuning values meet the requirements of the main transformer protection selectivity, sensitivity and reliability, to relay protection device, give full play to the role, to protect the safety of electrical equipment, to ensure the stable operation of the power system. Using MATLAB software to simulate the low frequency load shedding simulation, summarize the characteristics of the electrical quantity, and then get the simulation is feasible and correct.. In the operation of power system, the loss of frequency stability is the result of the frequency of the system crash, and the whole power failure of the system. It is proved that this is worth our second thought.. Therefore, to ensure the normal operation of the low frequency load shedding device, maintain the frequency stability, and ensure the active power supply and demand balance of power system. The two part of the main transformer substation design, and strive to achi