To analyze the interference effects on intelligent control equipment of low-frequency wide-pulse electric field, irradiation experiment system is established, and experiments are carried out. The effect rules and interference mechanism are confirmed. The results show that low-frequency wide-pulse electric field, which rise time is not less than 10ns and the pulse width is more than 1ms, can affects the normal working performance of the test equipment. But it cannot damage the test equipment even the field intensity reaches 100kV/m. To the intelligent control equipment, the direct effect and cable coupling of the irradiation field lead to the interference phenomenon. The interference is more serious when the orientation of connection line is in accordance with the polarization direction of the irradiation field. The rise time and electric field intensity are two main factors that affect the interference degree.
To analyze the interference effects on a certain shortwave radio of low frequency wide pulse electric field, irradiation experiments are carried out. Through theoretical analysis, simulation and experiment, the effect rules and interference mechanism are confirmed. The results show that low frequency wide pulse electric field, which rise time is not less than 10ns and the pulse width is more than 1ms, can interferes the normal working performance of shortwave radio. But it cannot damage the shortwave radio even the field intensity reaches 100kV/m. The main interference phenomenon is communication interruption, while it can comeback in a few seconds, usually about three or five seconds. It should be noted that the interference phenomenon happens in a certain frequency range. And in the range, the threshold interference field intensity rising with the increase of the frequency.
To simulate the source region electromagnetic pulse, a composite system was constructed by spatially combining a magnetic field coil with a bounded-wave simulator. This system can support the electromagnetic environmental effect tests that have both a pulsed magnetic field and pulsed electric field. However, the simulation results show that the magnetic field coil may cause electric field waveform distortion in the parallel section of the bounded-wave simulator. To explain the mechanism of electric field waveform distortion, a viewpoint was put forward that the spatial interaction relationships between the external magnetic field coil and the upper and lower plates of the bounded-wave simulator can be represented by three equivalent capacitors. In addition, the asynchronism of electric field changes was due to the charge-discharge property of the upper and lower capacitor on the intermediate capacitor. Furthermore, a circuit model based on these equivalent capacitors and inductor was established. The calculation results based on the circuit simulation software LTspice showed that, the voltage waveforms of the equivalent capacitors can be consistent with the electric field waveforms in the corresponding spatial region. These results verify the correctness of the equivalent capacitors and the circuit model proposed in this paper.
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