中阻抗母线保护原理、整定及运行的探讨

母线保护是电力系统中最重要的保护，其正确动作直接影响到电力系统安全、稳定运行。作以母线保护输入阻抗为线索，阐述了低阻抗、中阻抗及高阻抗母线保护的特点及使用范围，分析了中国电力系统广泛采用的中阻抗线线保护匠原理，结合电力系统的实际情况对母线各种运行状态，如正常运行、区外故障ＣＴ未饱和、区外故障ＣＴ饱和、区内故障以及区内故障ＣＴ饱和等情况对保护的性能进行了定性、定量分析，根据中阻抗电流差动继电器动作

THEORY, SETTING AND OPERATION FOR MID-IMPEDANCE BUSBAR PROTECTION

The busbar protection is the most important protective relayings in plants and substations of power system, the correctness of its action will directly influence to the security and stability of power system. The theory of mid impedance busbar protection which is widely used in power systems in China is analyzed in this paper. The properties of all kinds of actual and running states for the mid impedance busbar protection are discussed, such as normal operation, inner fault, external fault, CT saturation and so on. The setting rules and method, the preparation for running and the operation of this protection are presented. The mid impedance protection is of following advantages:short tripping time, better performance of anti saturation of CT, easy to implementation and more reliable.