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Knowledge/Will UHV lines cause harm to human health?
High-voltage line substations can be found everywhere in modern society. There are rumors that living near high-voltage substations and high-voltage transmission lines will expose you to strong radiation, which can cause a variety of serious diseases. Is this true? Is UHV radiation really so scary?
First of all, let’s briefly popularize the mechanism of electromagnetic influence of UHV lines.
When UHV lines are operating, charged charges will be generated around the wires, and these charges will form an electric field in the space; currents will pass through the wires, and these currents will generate a magnetic field in the space. This is commonly referred to as the electromagnetic field.
So is the electromagnetic environment of UHV lines harmful to the human body?
Studies by domestic and foreign scientific research institutions have shown that the electric field of transmission lines will not cause harm to cells, tissues and organs; long-term exposure to electric fields has not been found to have any biological effects on blood images, biochemical indicators and organ coefficients.
The influence of the magnetic field is mainly related to the strength of the magnetic field. The magnetic field strength around UHV lines is approximately the same as the earth's inherent magnetic field, hair dryers, televisions, etc. Some experts have compared the magnetic field strengths of different electrical appliances in life. Taking the hair dryer we are familiar with as an example, the magnetic field strength generated by a hair dryer with a power of 1 kilowatt is 35 × 10-6 Tesla (the unit of magnetic induction intensity in the International System of Units). ), this data is similar to our earth’s magnetic field.
The magnetic induction intensity in the area around UHV lines is between 3×10-6 and 50×10-6 Tesla. In other words, when the magnetic field around UHV lines is the strongest, it is only equivalent to two hair dryers. If you blow it in your ears, compared to the magnetic field of the earth itself where we live every day, it is even more "pressure-free".
In addition, according to electromagnetic field theory, when the size of an electromagnetic system is equivalent to its operating wavelength, the system will effectively emit electromagnetic energy into space. The span size of UHV lines is much smaller than this wavelength, which does not constitute effective electromagnetic energy emission, and its operating frequency is also far lower than the electromagnetic radiation power limit stipulated by the state. And in the documents of international authoritative organizations, the electric fields and magnetic fields generated by AC power transmission and distribution facilities are clearly called power frequency electric fields and power frequency magnetic fields, not electromagnetic radiation. Therefore, the electromagnetic environment of UHV lines cannot be called "electromagnetic radiation". radiation".
In fact, the reason why high-voltage lines are dangerous is not because of radiation, but because of high voltage and high current. In daily life, you should still keep a distance from high-voltage lines to avoid electrical discharge accidents. With the builders' scientific and standardized design and construction, and with the public's understanding and support for safe electricity use, UHV lines can be like electric high-speed railways, delivering a steady stream of energy to thousands of households safely and efficiently, providing It brings great convenience to our lives.
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