Experimental analysis of radiated magnetic field based on time frequency method for primary/secondary fusion distribution switch

Due to various electromagnetic interference, the primary/secondary fusion power distribution switch often has various faults, but the type of interference and evaluation methods considered in the current study are relatively single, which cannot completely simulate the interference intensity and action time in actual operation. This paper firstly describes the electromagnetic interference principle of the primary/secondary fusion distribution switch, selects to build a simulated transient harassment generation device, considers a model 10kV outdoor primary/secondary fusion distribution switch with the stable interference signal, and focuses on the collection of the spatial magnetic field signal near the switch. The magnetic field distribution around the secondary circuit. The results show that under the proposed interference, the instantaneous magnetic field strength on the side of the distribution switch transformer can reach 11000A/m and the characteristic frequency distribution of the interference signal is around 1.3MHz, 12MHz and 20MHz.