Influence of electromagnetic radiation pollution o

2022-07-28
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The influence of electromagnetic radiation pollution of 110kV power transmission and transformation project

Abstract: through the actual measurement of electromagnetic radiation of some 110 kV power transmission and transformation projects in Chengde area, the impact of electromagnetic radiation generated by 110 kV power transmission and transformation projects on the environment is studied and discussed, and the countermeasures and suggestions to reduce the level of electromagnetic radiation are put forward

key words: power transmission and transformation engineering; Electromagnetic radiation; Through actual measuring electronic radiation in 110 kV transmission and transformation projects in Chengde District, the effect of such radiation to the environment is investigated and discussed Countermeasures and suggestions for reducing the radiation level are put forward.

keywords:transmission and transformatio this provides a huge development space for rigid PVC foamed plastics; The sufficient supply of PVC raw materials, reasonable prices and the complete industrial chain have provided a reliable foundation for the development of rigid PVC foaming products; electromagnetic radiation; Environmental protection

Chengde City, located in the northeast of Hebei Province, has jurisdiction over 8 counties and 3 districts, with a total area of 39548 km2. Three districts of the city cover an area of 704 km2, the downtown area (Shuangqiao District) covers an area of 307 km2, and the total built-up area of the downtown area is about 30 km2. By the end of 2002, the total population of the city was 3.579 million (448000 in the three districts under the jurisdiction of the city). As an important part of Beijing, Tianjin and Tangshan power, Chengde Power not only supplies power to the region, but also undertakes the important task of supplying power to Beijing, Tianjin and Tangshan. At the same time, it also transfers Qinhuangdao Power to the west, playing a very important role in Beijing, Tianjin and Tangshan Power

in order to meet the needs of economic development and social progress in Chengde City, the power construction presents a rapid development trend, and large-scale substations and high-voltage transmission lines have gone deep into all parts of the country; However, the operation of high-voltage substations and transmission lines will bring about a special and invisible pollution electromagnetic radiation pollution while bringing about modern civilization. In recent years, this special pollution has attracted great attention from environmental protection, electric power and other relevant departments. Therefore, it is very important to understand and master the actual degree and range of electromagnetic radiation pollution in the operation of high-voltage substations and transmission lines with different voltage levels, and put forward effective control measures to reduce radiation pollution. In the following, the impact of electromagnetic radiation generated by some 110 kV power transmission and transformation projects on the environment will be studied and discussed without adjusting the actual measurement of electromagnetic radiation of some 110 kV power transmission and transformation projects in Chengde. Generation of electromagnetic radiation

1.1 high voltage substation

the upper layer of the high-voltage equipment in the substation has crossed live wires, and the lower layer has various shapes of high-voltage live electrical equipment and equipment connecting wires. The electrode shape is complex and the number is large, forming a relatively complex high alternating power frequency electromagnetic field in their surrounding space. One of the effects of this high electric field is the electrostatic induction to the surrounding area, that is, there is a certain electromagnetic radiation field around the substation. Improper coordination between substation layout and surrounding environment will produce certain electromagnetic radiation to its surrounding environment

1.2 high voltage transmission line

when the high voltage transmission line works, its voltage level is high, and a certain amount of electrostatic induction will be generated relative to the ground, that is, an alternating electromagnetic radiation field will be generated

excessive radiation exposure will have a direct impact on human central nervous system, peripheral nervous system, cardiovascular system, muscle tissue and other organs. The greater the height of the substation high-voltage frame and transmission line from the ground, the farther the charged body is from the ground, the smaller the electric field intensity it produces near the ground. Therefore, the field strength near the high-voltage frame of the substation and under the transmission line conductor has the maximum value, and with the increase of distance, the field strength decreases rapidly. Due to the influence of conductor sag, the corresponding maximum field strength influence area is located in the center of the span, while the minimum field strength influence area is near the tower, because the conductor suspension height here is high, and the tower itself also has a certain shielding effect. Measurement of electromagnetic radiation level

according to the characteristics of alternating electromagnetic field during power transmission and transformation, the power frequency undistorted electric field strength and power frequency magnetic field strength shall be measured under normal operating conditions

2.1 measuring instrument

hi3604 power frequency electromagnetic field meter made in the United States is selected as the measuring instrument

2.1. The measurement points and methods of longitudinal and transverse breaking force 2

the measurement methods and points of substations and transmission lines are carried out in accordance with hj/t 241998 technical code for environmental impact assessment of electromagnetic radiation of 500 kV EHV power transmission and transformation projects, and some adjustments are made according to the site conditions

the selection criteria for the test path are: the terrain is flat and very uniform. 1 there are no tall structures and trees nearby. According to the measurement conditions and the environmental characteristics of 110 kV substations in Chengde area, the 110 kV substations in Shangbancheng, maolangou and humaying are selected as the measurement objects; Each substation is located in the vertical direction outside the enclosure at the high-voltage frame of the substation (avoiding the high-voltage incoming line), and the distance between measuring points is 5 m, measured to the background. The ground projection of the center of the line at the maximum sag of the central conductor of the 5th ~ 6th tower of the incoming line of Shangbancheng substation is selected as the measuring point of the 110 kV line, and it is carried out along the direction perpendicular to the line. The spacing of the measuring points is 5 m, and it is measured to the background in sequence

select the vertical component at 1.5m above the ground of power frequency electric field and the vertical component and horizontal component at 1.5m above the ground of power frequency magnetic field for measurement. See Table 1 and table 2 for measurement results. Analysis of measurement results

3.1110 kV Substation

3.1.1 power frequency electric field

it can be seen from table 1 that the maximum power frequency electric field values of three 110 kV substations, Shangbancheng, maolangou and humaying, are 124.2, 20.6 and 17.3 v/m respectively, which occur at 0, 0 and 20 m away from the fence. The power frequency electric field of Shangbancheng and maolangou 110 kV substations decreases gradually with the increase of distance; The power frequency electric field of humaying 110 kV substation increases with the distance. The measured value first increases and the maximum value appears at 20 m, and then decreases. After 20 m, it is basically the background level

3.1.2 power frequency magnetic field

it can be seen from table 1 that the maximum vertical component of power frequency magnetic field of Shangbancheng 110 kV substation appears at

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