What Are the Effects Of Electromagnetic Field Exposure?

Power frequency electromagnetic field is an electromagnetic field generated by a 50-60 Hz power electrical system. The exposure route is divided into daily life electrical appliances and high-voltage power transmission equipment and other exposures to residents and occupational exposure.

Power frequency electromagnetic field is an electromagnetic field generated by a 50-60 Hz power electrical system. The exposure route is divided into daily life electrical appliances and high-voltage power transmission equipment and other exposures to residents and occupational exposure.

Exposure to human exposure to power frequency electromagnetic fields

(1) Environmental exposure. Daily life appliances and high-voltage power transmission equipment are exposed to residents.

(2) Occupational exposure. Substation (station) staff, inspection personnel, live operating personnel, etc.

Exposure to human health risks in power frequency electromagnetic field environment

(1) Impact on the central nervous system. There are different opinions on whether the ELF electromagnetic field has any effect on the central nervous system, but it is not uncommon to find those with neurasthenia. It is reported that 150 EHV transmission workers conducted dynamic observations at 500kV / m for 8 years, and the electric field intensity was mostly 1.4 to 8kV / m. Except for the increase in neurasthenia, no significant changes were found in the physical examination results. The former Soviet Union s Labor Protection Science Research Institute s research on the health status of workers in ultra-high-voltage substations showed that workers who stayed under a certain electric field strength first noticed changes in nervous system function.

(2) Impact on the cardiovascular system. The current reports on the effects of ELF electromagnetic fields on the cardiovascular system have not yet reached consensus. A medical college in China did an electrocardiogram examination of more than 400 employees working at 220kV / m and diagnosed according to ECG standards. The abnormal electrocardiograms were: left ventricular hypertrophy, right ventricular hypertrophy, myocardial strain, atrioventricular block, frequent Premature beats. Compared with the control group, there was no significant difference in the ECG abnormal rate. Hauf et al. In Germany used 50Hz alternating current, electric field strength of 20kV / m, and magnetic field strength of 0.3G (Gauss) to conduct experiments on volunteers. As a result, ECG, EEG, pulse rate, and blood pressure were all normal. Power frequency electromagnetic field strength is harmless to the heart and brain. Only some reports of power frequency electromagnetic fields can cause certain changes in ECG, such as left ventricular high voltage, right bundle branch block, sinus tachycardia, sinus bradycardia, etc., but they are functional and have no pathological significance. Still within the normal range.

(3) Impact on fertility. The effect of very low frequency electromagnetic fields on fertility is still different. Most people think that the ELF electromagnetic field has different effects on the reproductive ability of men and women. The congenital malformation rate of babies born to male workers who have been working in high-voltage substations for a long time has increased, while the rate of abortion and fertility of pregnant women who use electric blankets during pregnancy is significantly higher.

(4) Relationship with tumors. Studies have found that children living near high-voltage power lines have more leukemia. For the determination of the power frequency electromagnetic field strength of the crowd, it is useful to use the code of the power line to indicate the magnitude of the current, to measure the actual magnetic field strength for 24 hours, and to use theoretical calculation methods. Most of the results studied using these methods are: The relative risk increased, and the increased relative risk was 1.1 to 2.7. There are also reports of increased risk of brain cancer in children. The results of two large-scale occupational population surveys completed in Sweden showed that the relative risk of chronic lymphocytic leukemia increases with increasing magnetic field exposure. The relationship between occupational exposure to power frequency electromagnetic fields and other tumors, such as brain cancer, breast cancer, thyroid cancer, and offspring cancers, has also been reported, with brain cancer and women's breast cancer being the most common reports. However, there are different conclusions reported, so there is no convincing correlation about the relationship between power frequency electromagnetic fields and tumors.

(5) Health effects of weak electromagnetic fields. It is quite difficult to determine the impact of people's work and life under weak electromagnetic fields. According to epidemiological investigations, damage to human health caused by power frequency electromagnetic fields are: dizziness, nausea, fatigue, neck pillow pain, loss of appetite, decreased sexual performance, increased pulse, high blood pressure, decreased vision, slight changes in blood, and leukemia. , Cancer and other diseases. However, the countries around the world and the World Health Organization have not yet determined whether the power frequency electric and magnetic fields are harmful to human health. In 2001, the International Cancer Research Agency (IARC) identified extremely low frequency electromagnetic fields (0 to 300 Hz), including power frequency electromagnetic field frequencies, as "suspected carcinogens." ^[1]