Analysis and Improvement for Scheme of Self-demand System in Substation

Due to the important role of the self-demand system in the safety and stability of substation,its design scheme and device selection have great influence on the stability of substation operation.Through the analysis of self-demand systems of two substations,combined with the typical design of self-demand system of State Grid Corporation,the problems existing in design are put forward.In addition,the design scheme of self-demand system in substation is proposed from these aspects,such as simple design,device selection optimization and easy operation and maintenance and so on.