Most 10kV intra-urban high-voltage distribution lines use conductors with an insulating jacket, but even with an insulating jacket one or more porcelain vases are needed to insulate the poles or towers.
High-voltage transmission lines of 35kV and above use bare conductors, which are insulated with more vases depending on the voltage level.
Because of the different levels of filth in various regions, the number of porcelain vases in the same voltage level of the line in different areas of the porcelain vase string is also different.
Safe working regulations, equipment to ground high voltage higher than 250V for high voltage, 250V or less for low voltage, safety voltage is 36V, safety current is 10mA or less. The interpretation of the Law (2001) No. 3 defines 1KV as the starting point of a high degree of danger to the surrounding environment, while the power operation is 10KV .
Expanded Information:
Electromagnetic radiation affects the body's circulatory system, immunity, reproduction and metabolic functions, and in severe cases can induce disease and accelerate the proliferation of cancer cells in the human body.
High-voltage power lines have adverse effects on people's visual system. Eyes belong to the human body to electromagnetic radiation sensitive organs, too high electromagnetic radiation pollution will have an impact on the visual system, manifested in vision loss, causing cataracts and so on. High doses of electromagnetic radiation will also affect and destroy the body's original bioelectric current and bio-magnetic field, so that the original electromagnetic field in the body abnormal.
It is worth noting that different people or the same person at different ages on the ability to withstand electromagnetic radiation is not the same, the elderly, children, pregnant women are sensitive to electromagnetic radiation of the population. It is best to stay away from high-voltage power lines, otherwise it will lead to the outbreak of various diseases.
Baidu Encyclopedia - High Voltage Power Lines