低压电气柜母线短路动、热稳定性研究

On Dynamic and Thermal Stability of Busbar Short Circuit Fault in Low Voltage Electric Cabinet

短路是电力系统常见的故障,短路电流会对母线系统和载流导体产生巨大的电动冲击力,同时,也使得开关柜内的母线、电缆和元器件等导电部件温度迅速升高,导致低压电气柜内的母线系统遭到破坏。文章通过对短路现象的分析,深入研究了短路对母线的影响以及如何分析计算它的动、热稳定性,以便顺利通过型式试验,为工程技术人员提供一定的理论依据。

Short circuit fault occurs frequently in power system, and short -circuit current not only produces great electric impact on the bus system and current-carrying conductor, but increases rapidly the temperature of conductive components of the switch cabinet such as bus bar, cable and electric parts, which results in damage to the bus system of low voltage electric cabinet. Based on the analysis of the short circuit phenomenon, the present paper makes an in-depth study of the impact of short circuit fault on the bus and of how to analyze and calculate its dynamic and thermal stability, aiming to provide a theoretical reference to engineering and techni-cal workers.