The cumulative effect analysis of the short-circuit current of the key equipment in power systems based on the batch operations of PSD-BPA software

摘要

Safe and reliable operation of the power grid equipment directly relates to the safety and reliability of power systems in the electric power systems. When the short circuit fault occurs in the power grid, over-current flows through the electric devices will produce certain effects on the equipment. Long-term cumulative effect of many times faults cause significant influence on the key equipment. Currently, there is lack of an effective quantitative analysis method in the cumulative effect of the short circuit current which aimed at key equipment (transformer, circuit breaker, etc.) in the power systems. This paper presents a fault short-circuit current cumulative effect analysis model, based on the PSD-BPA software and results of the batching calculation of the short-circuit current program, according to the fault occurrence time, the actual fault type and system operation parameters. The paper presents the results of the cumulative effect of a fault in the Jiangsu power grid. Finally, it puts forward the ideas of the graphical display of application in the power systems. The proposed method can be used to sort the equipment according to the history fault current cumulative effect of the equipment, and provide early warning and maintenance of the equipment, which will help to improve the safe and stable operation of the power grid.