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Characteristics and foundation construction of overhead insulated conductors
Release time:
2022-09-14
Overhead insulated conductors have superior insulation performance than bare wires due to the addition of an insulating layer, which can reduce the phase distance of the line, reduce the insulation requirements of the line support part, and increase the number of circuits of the same pole erection line. Because the outer layer has an insulating layer, the overhead insulated wire is less corroded than the bare wire, and the corrosion resistance is stronger, which can extend the service life of the line.
The overhead insulated wire lines used in daily life are now designed in accordance with insulated wires in urban areas, especially densely populated urban areas (villages in the city) (in fact, they are designed according to the needs of the city and are generally designed according to cables). The reason is very simple and important is to prevent electric shock. In the vast rural areas, or remote mountainous areas, there are many such exposed wires in the air.
First, the countryside is located in remote mountainous areas, with a relatively small population and an empty area. The overhead insulated wire route can usually avoid the dense houses in villages and towns, and the probability of personal electric shock is relatively small. Second, it is also related to the tensile strength of overhead power lines and mine pressure relief (not explained), so what are the specific characteristics of overhead insulated conductors?
1. Good insulation performance. Overhead insulated conductors have superior insulation performance than bare wires due to the addition of an insulating layer, which can reduce the phase distance of the line, reduce the insulation requirements for the line support part, and increase the number of loops of the same line.
2. Good corrosion resistance. Because the outer layer has an insulating layer, the overhead insulated wire is less corroded than the bare wire, and the corrosion resistance is stronger, which can extend the service life of the line.
3, to prevent external damage. Overhead insulated conductors can reduce the impact of external factors such as trees, flying metal films, and dust, and reduce interphase short circuits and grounding accidents.
4. The strength meets the requirements. Although the overhead insulated conductor lacks steel core, it has strong toughness, so that the mechanical strength of the conductor can meet the requirements of stress design.
Basic construction of overhead insulated conductors
According to this standard, the common forms of construction of overhead insulated conductor road tower foundation in China are mainly excavation backfill foundation and undisturbed soil foundation. Foundation pit backfill foundation mainly includes straight column concrete foundation, straight column or inclined column reinforced concrete slab foundation, assembly type, joint type and anchor foundation, undisturbed soil type, mainly including foundation pit, digging pile foundation, spiral anchor pile foundation, micro pile foundation, pile foundation, etc. As far as our daily common statements are concerned, the common construction methods are based on the following:
1) Reinforced concrete foundation
The advantages of this kind of foundation relative to the following two kinds of foundation are saving money and burial depth. The disadvantage is that the working area is large, the floor area is large, and the foundation construction of overhead insulated conductor is not enough slope and unsafe from this visual point of view.
2) Steel pipe pile
Overhead insulated wires are driven into the ground by one (or several) steel pipes, flanged on the ground, and then bolted to the tower.
3) Cast-in-place pile
The form of the cast-in-place pile is similar to the steel pipe pile, but the overhead insulated conductor is buried in the reinforced concrete pile instead of the steel pipe. Pay attention to the Golden Great Wall to learn more about overhead insulated conductors.
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