Electromagnetic Shielding Effect of Aluminum Foam in 10-500 kV Electrical Substations

摘要

With the growing attention drawn to the electrical substation electromagnetic environmental problem, the application of material with electromagnetic shielding effect gains more and more popularity. This work evaluated the electromagnetic shielding effect of aluminum foam in 10 kV Xifaxian transformer dado and three electrical substations, a 66 kV Niluo substation, a 220 kV Hexi substation and a 500 kV Keerqin substation. 304L stainless steel and its composite material were also used as a comparison. By comparing with the environmental data, it showed that the power frequency electric field intensity next to the transformer of 500 kV Keerqin substation was slightly higher than the national standard, whereas the other power frequency electric field and magnetic induction intensities were lower than the limit values. The power frequency electric field and magnetic induction intensities attenuated with the increase of measuring distance from enclosing wall. 304L stainless steel, aluminum foam and their composite materials all had certain electromagnetic shielding effect. Aluminum foam and composite materials had almost the same shielding effect for power frequency electric field, which was slightly better than 304L stainless steel. Unlike the electric shielding effect, the magnetic shielding effect of aluminum foam was significantly superior to that of the 304L stainless steel. Meanwhile, their composite material had the best one.