Is the electromagnetic radiation of substation harmful to human health?
There is the influence of electromagnetic radiation.
Magnetic pollution has become the fourth largest pollution after air pollution, water pollution and noise pollution. Whether people admit it or not, all devices that run on electricity will produce electromagnetic waves. As long as this electromagnetic radiation exceeds the quantitative value, it will cause harm to human body and other electrical appliances. Nanjing Fengshui Yijing Group 27972 18 1
There is a difference between these two standards.
1) The corresponding requirements in China are that the electric field strength should not exceed 4000V/ m and the magnetic field strength should not exceed 100 microtesla.
2) Sweden 0.2 micro Tesla
1. The conclusion of Swedish National Council for Industry and Technology Development: 1 and 1.5 Children under 5 years old are more than 2.7 times more likely to suffer from leukemia if they are exposed to an environment with an average magnetic induction intensity greater than 0.2 microtesla; 2. If the magnetic induction is greater than 0.3 micro Tesla, it is 3.8 times.
3) The power frequency magnetic field in the United States is 0.2 micro Tesla.
2. 1995 The National Radiation Protection Committee (NCRP) of the United States put forward the guideline of electromagnetic field exposure, which also mentioned that Sweden put forward the power frequency magnetic field of 0.2 micro Tesla as the guideline of transmission lines passing through residential areas according to the correlation between childhood leukemia and the annual magnetic field level.
After considering the laboratory report on ecological impact and epidemiology, the Committee recommended that:
The magnetic field near newly-built nurseries, schools and playgrounds shall not exceed 0.2 micro Tesla. No new houses shall be built under or near the existing high-voltage transmission lines, and the time for exceeding 0.2 micro Tesla magnetic field every day shall not exceed 2 hours. When building new transmission and distribution lines, do not make the magnetic field in adjacent existing houses exceed 0.2 microtesla. Build a new office and reduce the intermittent and ambient magnetic field to 0.2 microtesla.
The conclusion of California Health Science Assessment Agency: "Electromagnetic field can increase the risk of childhood leukemia, adult malignant brain tumor, amyotrophic lateral sclerosis, abortion and so on. To a certain extent, this may lead to suicide and adult leukemia. "
4) UK 0.4 micro Tesla
The reporter saw a report written in 200 1 from the official website of the British National Radiation Protection Committee. According to the report, 700,000 people are born in Britain every year, among which 500 children with leukemia and 1 0,000 children with cancer are found in the population under 0.5 years old every year. At least two of the 500 children with leukemia each year are directly related to the electromagnetic radiation generated by high-voltage wires. In this way, the incidence of leukemia in children living under electromagnetic radiation is one in 700, which is twice as high as that in children living without electromagnetic radiation (1400). The Committee has set the risk value as 0.4 microtesla, above which children will be at risk of getting sick.
5) Denmark 0.3 ~ 0.4 micro Tesla
Denmark conducted a survey on 1707 children 16 years old living near high-voltage transmission lines. The results show that children living in houses with an average electromagnetic field intensity of 0.3 ~ 0.4 microtesla are prone to cancer.
In 200 1 year, the International Center for Research on Cancer has identified magnetic pollution as a carcinogenic factor, and pointed out that when the magnetic field intensity in the living environment exceeds 0.4 μ τ, the incidence of childhood leukemia will increase significantly.
The elderly, children and pregnant women are sensitive to electromagnetic radiation. Based on the attitude of nip in the bud, it is suggested that pregnant women, especially those in the first trimester, should stay away from the radiation field and not take any chances.
It has been reported that many residents living under high-voltage lines or near TV transmission towers will suffer from neurasthenia, depression, anxiety, hypertension and other diseases for no reason. Because there is a huge magnetic field around high-voltage lines and TV towers, and this magnetic field interferes with the magnetic field of the earth and the magnetic field of the human body itself, leading to the disorder of the human magnetic field and causing some of the above diseases.
High-voltage lines transmit large current, and the magnetic field generated by large current has an impact on people's health. British experts believe that the safe value of the magnetic field generated by high-voltage lines is 0.4 micro Tesla, above which children will face the risk of illness.
Electromagnetic radiation intensity exceeds 0.4 microtesla within 220kV high-voltage line100m; The electromagnetic radiation intensity of 1 1-66 kV high-voltage lines within a range of more than ten meters exceeds 0.4 micro Tesla; The electromagnetic radiation intensity of high-voltage lines buried in the ground is only more than 0.4 micro Tesla within a few meters. In fact, it can be calculated according to the formula, which is related to voltage and distance.
For example, Guangdong Environmental Radiation Research and Monitoring Center conducted on-site monitoring in Xiaogang 1 10 kV indoor substation in Haizhu District, and monitored three points outside the substation wall, 20 meters near the substation window and 50 centimeters in front of the TV. The results show that the electric field intensity outside the wall is 1V/ m, and the magnetic field intensity is 0.7 micro Tesla. The window is 1V/ m, 0.6 micro Tesla. This has actually exceeded the standard according to international standards.
1In July, 993, World Vision magazine also pointed out that electromagnetic waves will reduce people's immunity and reduce the number of white blood cells in anti-cancer cells. /kloc-children under 0/5 years old, if they live in a place where the magnetic induction intensity is 0. 3μT room, then his chance of suffering from leukemia will be four times that of ordinary children.
1997 1 10 In October, scientists from Carlo Lisca University in Stockholm, Sweden conducted a survey of 430,000 residents living near high-voltage transmission lines for a long time, and published a research result. Scientists have clearly pointed out that electromagnetic waves are directly related to cancer, especially brain tumors and childhood leukemia. Liv 1 Friedberg, head of the department of mechanical engineering of Lund University, said that among the employees working there, six cancer patients were found, four of whom were caused by electromagnetic radiation, because they lived in an environment with magnetic induction intensity as high as 40μT all day.
The magnetic induction intensity directly under the 400kV high-voltage line can reach 13μT, 8μT at a distance of 30m and 0.. 1μT at a distance of 200m.
The United States has published in IEEE Spect rum 1995No. 10 that the magnetic induction intensity at 60Hz should not exceed 0. 2μT, otherwise it is harmful to human body. At present, Sweden officially recognizes that the intensity is 0. Low-frequency magnetic fields above 2μT are harmful to human body.