In order to improve the performances of electromagnetic protection of electronic transformers

we tried to simulate the equivalent circuit and test the devices.We established an electronic transformer simulation model with isolator switch under small capacitive current test status.Using this model

we got the operating over-voltage and over-current current simulation waveforms.Moreover

using the transient current signal as an excitation source

we established an equivalent circuit model according to the electrical parameters of the Rogowski coil.The Rogowski coil output was high-frequency signal with the output voltage spikes up to 680 V

which caused the A/D converter in the acquisition unit unable to work properly.According to the characteristics of the output signal of the Rogowski coil

we proposed electromagnetic interference measures that TVS tube and RC low-pass filter should be combined.The measures simulation modeling results show that the transient voltage spikes can be reduced to below 0.6 V.Finally

we have tested the isolation switch of electronic transformer under small capacitive current division experiment

the test results have verified the reliability of the above efficient modeling methods and anti-jamming measures.