Abstract: 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.

Key words: electrical signal interference, shielding material, shielding efficiency, the electromagnetic wave