电控撬用电磁屏蔽材料屏蔽特性实验

为减少天然气集气站场电控撬内强弱电系统电磁干扰,保证其控制系统安全可靠运行,采用实验方法,测试分析了用于电控撬的铁丝网、铝箔防辐射胶带及防辐射布料的屏蔽效能.实验结果表明:电磁屏蔽材料的屏蔽效能受干扰电磁波辐射距离的影响较小,而受电磁波频率的影响较大;铁丝网、铝箔防辐射胶带和防辐射布料的电磁屏蔽效能,随干扰电磁波频率增大总体呈现出先增大后减小趋势.在干扰电磁波频率0~500 MHz波段,铁丝网和防辐射布料的屏蔽性能优于铝箔防辐射胶带的性能;在500~1 000 MHz波段,铝箔防辐射胶带和防辐射布料屏蔽性能优于铁丝网的性能;在1 000~2 500 MHz波段,铁丝网和铝箔防辐射胶带的电磁屏蔽性能优于防辐射布料的性能.

Experiment investigation on characteristic of electromagnetic shielding materials in electrical instrument control device

In order to reduce electromagnetic interference between strong and weak electric systems of electrical instrument control device and ensure safety as well as reliable operation of the device in natural gas store station, this study adopts a kind of experimental method to test and analyze shielding effectiveness of wire mesh, aluminum foiled anti-radiation tape and radiation protection cloth. Tested results show that the shielding effectiveness of electromagnetic shielding materials is less affected by radiation distance of interference electromagnetic waves, but greatly affected by frequency of the interference electromagnetic waves. The electromagnetic shielding effectiveness of wire mesh, aluminum foiled anti-radiation tape and radiation protection cloth may increases at first and then decreases with increase of frequency of the interference electromagnetic wave. In the frequency band of 0~500 MHz, shielding performance of wire mesh and radiation protection cloth is better than that of aluminum foiled anti-radiation tape. In the frequency band of 500~1 000 MHz, the shielding performance of aluminum foiled anti-radiation tape and radiation protection cloth is better than that of wire mesh. In the frequency band of 1 000~2 500 MHz, the electromagnetic shielding performance of wire mesh and aluminum foiled anti-radiation tape is better than that of radiation protection cloth.