A new research of fault selection based on active protection

摘要

The small current grounding system has many problems: low ability of extinguishing arc grounding and personal sense of electric system, none security and protection ability to indirect grounding overvoltage, equipment internal fault grounding, the new type of fault line selection method in this paper based on active protection can effectively solve the above problems. This article first introduces the significance of active protection to the quick arc suppression and personal protection, then puts forward a new kind of line selection method based on active protection and introduces its principle, finally, through research in the small current grounding system of single-phase grounding fault which is in different transition resistance, initial Angle and fault distance by using wavelet transform and PSCAD software simulation, the effectiveness of the active protection of line selection and accuracy is verified.