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Science Popularization of Overhead Insulated Conductors
Release time:
2022-09-21
Overhead insulated conductor lines are composed of line towers, conductors, insulators, accessories, cables, towers, grounding devices, etc., and are erected on the ground for power transmission between two points of the system. Generally speaking, transmission lines on the ground can be classified into different types according to different voltage levels.
What is an overhead insulated conductor?
Overhead insulated conductor lines are composed of line towers, conductors, insulators, accessories, cables, towers, grounding devices, etc., and are erected on the ground for power transmission between two points of the system. Generally speaking, it is the transmission line on the ground. According to different voltage levels, the following types are usually seen:
Composition and function of overhead insulated conductor lines
Overhead insulated conductors are composed of conductor (ground) lines, towers, insulators and accessories, foundations and other ancillary facilities.
1. lead (ground) wire: the conductor is steel core aluminum stranded wire, and the ground wire is steel stranded wire.
1) Wire
Overhead insulated conductors basically have two kinds of conductors, usually called bare conductors, and those called insulated conductors. Among them, the bare wire is commonly used for 10kV and below the basic use of insulated wire.
2) Ground
Overhead insulated conductor grounding wire, also known as lightning wire, is mainly used to protect the wire below it from lightning; if only need to play a role in lightning protection, the grounding wire is generally made of steel strand. With the continuous development of information technology, many grounding cables use optical fiber composite overhead grounding, in addition to the original lightning protection function, but also as a data transmission between two substations.
2. (pole) tower
1) Concrete bar (concrete bar)
At present, most concrete poles are used in power grids of 20 kV and below, but there are some exceptions. The advantage of overhead insulated conductor concrete poles is low cost, so the parts used in low-voltage power grids are also more suitable for concrete poles, such as some Gobi deserts in Xinjiang, where the sand is too large, and it is easy to damage the anti-corrosion coatings of angle steel towers.
2) Angle steel tower
Angle steel tower is usually seen in the form of overhead insulated conductor high-voltage tower, most of the use of hot-rolled angle steel manufacturing, bolt assembly of space truss structure, a few also use steel pipe (for large span), overhead insulated conductor angle steel tower is divided into sub-pull type and self-supporting type.
The disadvantage of overhead insulated conductor angle steel Tara wire type is that it occupies a large ground area and has the advantage of saving steel. Therefore, if you travel to Qinghai, you will often see cable-type angle steel towers on the roadside. In application, more iron towers are self-sustaining iron towers. Simply understand that iron towers without cables are self-sustaining iron towers.
The overhead insulated conductor angle steel tower is a self-supporting tower. The self-supporting tower is better to construct in places with inconvenient transportation, because the tower can be transported to the corresponding position in batches, such as on the hillside and where the crane cannot go. In addition to a lot of high-voltage work, 35kV helicopter construction is rarely useful, so the material of the donkey mountain transport tower that was said in the early years is not a joke at all.
3) Steel pipe rod
The advantage of overhead insulated conductor steel pipe rod is small area, but the disadvantage is expensive. In addition to its small footprint, it is also relatively beautiful and easy to construct (when cranes can be used). Because of this, steel pipe poles are popular in urban areas. Pay attention to the Golden Great Wall to learn more about overhead insulated conductors.
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