Research on the EFT radiation characteristic of classical structures used in Measuring-control System

This paper analyzed the Electrical Fast Transient (EFT) radiation interference characteristic and effect factors of three classical structures including: the electromagnetic relay, the inductance coil and the thin wire which are commonly used in the Measuring-control System. The EFT interference radiation model has been built by the NUFDTD method. This method divides the simulation space into a sort of grids which are non-uniform. Thus it can acquire a more detailed simulation model while using less computational resource. Use this method, the changing regularity of EFT radiation field, when the different stimulate source being put on the according structure, has been studied. At the same time, the corresponding relationship of the distributing characteristic of the EFT radiation field and the device structure has been discussed. Finally, based on the analysis and discuss conclusion, according to each classical structure, some anti-interference methods have been brought forward.