Analysis of Protection Misoperation Caused by Two-Point Grounding of Current Transformer Secondary Circuit
This paper selects a case of a 500 kV substation busbar differential protection misoperation as a research example.Through on-site investigation of the accident,fault simulation tests,and theoretical analysis,it comprehensively explores the mechanism of protection misoperation caused by two-point grounding in the secondary circuit.By constructing an equivalent model of the grounding grid and conducting experimental verification,this paper accurately quantifies the magnitude of the induced current caused by two-point grounding and its influence range on protection operation.Based on the research results,the paper proposes suggestions for optimizing the design of the secondary circuit and standardizing operation procedures,aiming to provide a theoretical basis and practical guidance for the operation and maintenance of power grids.
万方数据
维普
