Street lights: 4 m. 6 m. 8 m. 12 m. Telephone poles (cement): 6 m. 7 m. 12 m. Steel structure: high voltage 30 m and low voltage 20 m.
At present, some poles can be manufactured up to 54 meters, suitable for 110KV4 circuit straight poles. The height of the pole depends on the transmission voltage. The higher the voltage, the higher the pole. It depends on how much high and low voltage is transmitted. The poles on the city's main roads are all 12 meters in length and should be three-phase four-wire voltages of 10 kV and 380v.
High-voltage electric towers and electrical towers are tower-shaped buildings such as trapezoids, triangles, etc. The height is usually a steel frame structure of 25-40 meters. Most are built near field power plants and distribution stations. Generally made of angle steel, steel pipe and other materials.
The length of ordinary poles is generally 4.5 to 15 meters. For example, our common poles are wooden poles and cement poles. They have different heights and stand on the plains and mountains.
The height of the pole is mainly determined by the voltage level. The higher the voltage level, the higher the pole. The lowest point of the overhead line from the ground is specified in the national standard. After the height of the pole is installed, the lowest point of the arc sag should meet the national standard requirements. Such a pole height is appropriate.
In addition, the areas where the poles pass are also related. Through uninhabited areas or residential areas, the lowest point is different. For overhead lines of the same voltage level, the height of the poles is also different.
According to the installation of metal appliances on the pole, if it is not a single circuit, and the circuit is arranged vertically, this will also increase the pole.
It is generally known that the height of the pole is not determined at once, it depends on the line conditions.
The general length of a telephone pole ranges from 7 to 10 meters, and it is usually buried about 1 to 1.8 meters underground.
Pole spacing: ordinary poles: 50 meters high-voltage lines: 200 meters The horizontal safe distance from the building is as follows: 1.0 meters below 1 kV 1.0--10 kV 1.5 m 35 kV 3.0 m 66-110 kV 4.0 Meters 154-220kV 5.0m 330kV 6.0m 500kV 8.5m High-voltage lines and high-voltage live equipment under normal operation often carry voltages of several thousand volts, tens of thousands of volts, or even hundreds of thousands of volts. When the human body is close to them, the high voltage carried by high-voltage lines or high-voltage equipment may penetrate the air between them and the human body, so the discharge phenomenon generated by the human body occurs, causing electrical burns and even death when the current passes through the human body. This is the so-called high voltage arc electric shock. In order to avoid such an electric shock, the power department has stipulated the safe distances that must be maintained for high voltage live lines of different voltage levels.They are: 10,000 volts, not less than 1 meter; 35,000 volts, not less than 2.5 meters; 11 10,000 volts, not less than 3 meters; 220,000 volts, not less than 4 meters. Experienced electricians and electrical engineering technicians can determine the voltage level at a glance according to the erection of the power line; if they are not sure, the voltage level cannot be accurately judged for a while. In order to be sure, when working, it is better to press the higher one The safety distance of the step voltage is away. High-voltage live equipment has obvious signs: "High-voltage danger, do not approach!", The human body must also maintain a safe distance from them, especially when the ambient air humidity is large.
