Unlike ordinary cables, do high voltage cables have insulation?

I. Unlike ordinary cables, do high voltage cables have insulation? Ordinary cables are wrapped with a layer of insulation. Single high voltage cables are always naked and have no insulation. Why? Most of the high voltage transmission lines have a transmission voltage of more than 1,000 volts, and some lines have a transmission voltage as high as 1,000 volts and 50,000 volts. If you were to wrap insulation around such a line, the thickness of the insulation on ordinary lines would be far from adequate. Usually the voltage of the wires at home is only 220V, so as long as they are wrapped with a thin layer of insulation to prevent people from coming into contact with the fire wire, they can prevent electrocution. But high voltage equipment is different. People standing next to high-voltage equipment at a certain distance can cause electrocution even without contact. Therefore, it is not enough to wrap a layer of insulation of household wires for high-voltage transmission lines. According to the high-voltage line contact human safety distance for every 3,000 volts 1mm, 500,000 volts line insulation thickness of at least 17cm approximately. Such a thick layer of insulation is bound to greatly increase the weight of the transmission line, so for a thousands of kilometers of transmission lines, the cost of investment is bound to double. Of course, there are also high-voltage lines wrapped in insulation, which we call high-voltage cables. High-voltage cables are generally used in areas where overhead lines are not suitable, such as underground laying. In addition to thick insulation, high-voltage cables also use copper cores, so the cost of high-voltage cables is more than 10 times that of ordinary overhead lines, and they are not used unless necessary.

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