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

2017 ◽  
Vol 898 ◽  
pp. 2378-2383 ◽  
Author(s):  
Qian Qian Yang ◽  
Wen Xiao Qian ◽  
Jing Yuan Liu ◽  
Ming Chen ◽  
Hao Li ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Composite Materials ◽  
Electric Field ◽  
Aluminum Foam ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
304L Stainless Steel ◽  
Power Frequency ◽  
Frequency Electric Field

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.

ABS Fabrics Chemically Plated by Cu/Ni-P as Electromagnetic Shielding Material

2011 ◽  
Vol 306-307 ◽  
pp. 385-388
Author(s):  
Cheng Da Yu ◽  
Qi Bin Deng ◽  
Ping Li ◽  
Ming Cun Wang ◽  
Yong Feng Wang
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
High Frequency ◽  
Gradual Increase ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
Ideal Candidate ◽  
Varying Thickness ◽  
Fabric Composite ◽  
Shielding Material

In this paper, a novel composite material of Acrylonitrile-Butadlene-Styrene resin (ABS)-based fabric coated with Cu/Ni-P was prepared via chemical redox plating technique. A series of such composite materials with varying thickness of Cu and Ni-P showed remarkable electromagnetic shielding ability. With the increase of Cu thickness, the shielding effect (SE) increased gradually, but leveled off after 1.5μm at a SE of about 70dB. Similarly, with the increase of the depth of Ni-P coats, the SE showed a trendency of gradual increase, and leveled off after 1.0μm at a SE of about 45dB. The optimum ABS/Cu/Ni-P was Cu 1.5μm and Ni-P 1.0μm unilaterally. The ABS/Cu/Ni-P composite material possessed excellent shielding ability in the range of 0.001-1000MHz at a stable SE of >80dB, and it also possessed ideal shielding effect in the range of >36GHz. But in the range of 10-18GHz, the shielding effect is slightly decreased gradually to about 60dB. So the ABS/Cu/Ni-P fabric composite is an ideal candidate for electromagnetic shielding material at low and high frequency radiations.

ABS Fabrics Chemically Plated by Cu/Ni-P as Electromagnetic Shielding Material

2011 ◽  
Vol 328-330 ◽  
pp. 1086-1089
Author(s):  
Cheng Da Yu ◽  
Ping Li ◽  
Yong Feng Wang ◽  
Lei Tang
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
High Frequency ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
Plating Technique ◽  
Ideal Candidate ◽  
Varying Thickness ◽  
Fabric Composite ◽  
Shielding Material

In this paper, a novel composite material of Acrylonitrile-Butadlene-Styrene resin (ABS)-based fabric coated with Cu/Ni-P was prepared via chemical redox plating technique. A series of such composite materials with varying thickness of Cu and Ni-P showed remarkable electromagnetic shielding ability. With the increase of Cu thickness, the shielding effect (SE) was increased gradually, but leveled off after 1.5μm at a SE of about 70dB. Similarly, with the increase of the depth of Ni-P coats, the SE increased gradually, and leveled off after 1.0μm at a SE of about 45dB. The optimum ABS/Cu/Ni-P was Cu 1.5μm and Ni-P 1.0μm unilaterally. The ABS/Cu/Ni-P composite material possessed excellent shielding ability in the range of 0.001-1000MHz at a stable SE of >80dB, and it also possessed ideal shielding effect in the range of >36GHz. But in the range of 10-18GHz, the shielding effect is slightly decreased gradually to about 60dB. So the ABS/Cu/Ni-P fabric composite is an ideal candidate for electromagnetic shielding material at low and high frequency radiations.

New requirements for power frequency electric field and induced current personal protective equipment

2020 ◽  
Vol 60 (11) ◽  
pp. 849-852
Author(s):  
Sergey Yu. Perov ◽  
Tatyana A. Konshina ◽  
Elena N. Makarova-Zemlyanskaya
Keyword(s):  
Electric Field ◽  
Personal Protective Equipment ◽  
Occupational Safety ◽  
Protective Equipment ◽  
Safety Standards ◽  
Emergency Situations ◽  
Step Voltage ◽  
Power Frequency ◽  
Staff Protection ◽  
Frequency Electric Field

In conditions of exceeding the maximum permissible levels of power frequency electric field, the staff must use personal protective equipment. Requirements for such means are regulated by the system of occupational safety standards. The goal of this work is analyzed new requirements for power frequency and induced personal protective equipment in the regulatory interstate standards GOST 12.4.172 and GOST 12.4.283. The personal protective equipment new requirements for various types of work are substantiated to electrical personnel health safety during the maintenance and operation of power grid facilities. Increasing requirements for personal protective equipment improves the staff protection at ground potential and at wire potential, including in emergency situations such as induced and step voltage.

Calculation of Power Frequency Electric Field under Overhead Lines with Complex Ground

2013 ◽  
Vol 441 ◽  
pp. 212-216
Author(s):  
Zhen Guang Liang ◽  
Yu Ze Jiang ◽  
Di Wen Jiang ◽  
Zong Jie Liu
Keyword(s):  
Electric Field ◽  
Surface Charge ◽  
Simulation Method ◽  
Three Dimension ◽  
Charge Simulation Method ◽  
Overhead Lines ◽  
Straight Line ◽  
Power Frequency ◽  
Frequency Electric Field ◽  
Distribution Of Electric Field

This paper studied influence of three dimension complex ground on electric field under overhead lines. Surface charge method is discussed and planar triangle surface charge elements are used to represent complex ground. Electric field of overhead lines is analyzed by charge simulation method. Finite straight line charges are used to represent conductors. Then electric field of 220kV double circuit overhead lines over a three dimension small hill is calculated and distribution of electric field 1.5m above the ground is analyzed.

Influence of temperature and humidity on power frequency electric field intensity

2018 ◽  
Vol 191 (1) ◽  
pp. 104-110
Author(s):  
Chunping Yang ◽  
Wenbin Zhang ◽  
Nianrong Zhou ◽  
Lijun Tang ◽  
Tianwen Li
Keyword(s):  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Influence Of Temperature ◽  
Temperature And Humidity ◽  
Power Frequency ◽  
Frequency Electric Field
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