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Requirements and construction specifications for overhead lines
Release time:
2022-03-02
Overhead lines shall be made extensively of steel-reinforced aluminum stranded wire or aluminum stranded wire. The aluminum stranded section of the high-voltage overhead line must be larger than 50 mm², and the core aluminum stranded section must be larger than 35 mm². The blank line section is not a 16 mm².
Overhead lines shall be made extensively of steel-reinforced aluminum stranded wire or aluminum stranded wire. The aluminum stranded section of the high-voltage overhead line must be larger than 50 mm², and the core aluminum stranded section must be larger than 35 mm². The blank line section is not a 16 mm².
The cross-section of the conductor shall meet the requirements of the maximum load.
Section selection must also meet the voltage loss is not more than 5% of the rated voltage (high voltage overhead line) or 2% ~ 3 (visual requirements of the lighting circuit). Must meet a certain mechanical strength.
1: high pressure rod head, 2: high pressure needle insulator, 3: high pressure cross bar, 4: low pressure cross bar, 5: high pressure suspension insulator, 6: low pressure needle insulator, 7: support cross bar, 8: low pressure butterfly insulator, 9: chuck
overhead line construction
Overhead line construction specification methods and steps are as follows:
Line survey: explore topographic features according to the design drawing, determine the pole positions of the starting point, corner point and terminal point of the line, and finally determine the positions of intermediate telegraph poles and reinforcement rods, and insert piles.
Backfilling of foundation pit excavator: pay attention to the soil quality and surrounding environment when digging the foundation pit. The size of the pit is generally 0.8 meters wide and 0.3 meters long. Cable pit size is generally 0.6 meters wide, 1.3 meters long.
When refilling tower foundation and cable foundation, do not refill tree roots, weeds, etc., but compact the soil more than twice, and refill it 30-50cm higher than the ground.
Bracket: The lever is used to support the wire on the overhead line. There are many types of front bars, and the common ones under its action are straight bars, corner bars, and end bars. Commonly used methods are crane bracket, tripod bracket, reversing bracket and bracket bracket bracket.
The tripod bracket is a relatively simple bracket method, which mainly relies on the small winch of the tripod to suspend the pole. When the bracket is held, the team is first moved to the pit edge, the tripod is erected, three ropes are tied at the end of the team to control the lever body, then the team is stopped on the cage, and finally the pole body is adjusted to complete the filling.
Cross bar assembly: The cross bar is a bracket for installing insulators, switchgear, lightning arresters, etc. According to the material, there are wooden transverse belt, iron transverse belt, ceramic transverse belt, etc. Straight bar crossbars should be installed on the load side, and non-straight bars should be installed on the tension side.
Insulator: Insulator is used to fix the wire. Therefore, it must have sufficient electrical insulation properties and mechanical strength. Insulators commonly used in overhead lines are needle insulators, suspension insulators, butterfly insulators, etc. The rated voltage of low-voltage insulators is 1kV, and high-voltage insulators are used for 3kV, 6kV and 10kV lines.
Cable construction: Pull the cable on the overhead line to play the role of a supporting lever. Generally, corner strips, terminal strips, tension strips, etc. must be supported by cables to avoid tilting under the influence of wire tension. Generally, the angle between the rope and the ground is between 30 and 60, respectively, pulling the rope, pulling the rope, pulling the rope. Wire installation method: wire installation operation includes wire layout, wiring, wiring, tight wire, etc. Paying off is to take the wires out of the ship's board and place them on the pole crossbar. There are two kinds of pay-off methods: drag and drop method and display method. Overhead line wiring generally adopts winch, binding, extrusion and other methods. The wire is pulled on the lever with a small rope and placed on the crossbar. The tight wire ties the wire firmly to the insulator from one end of the tension, and the other end is tightened with a tight wire. Arc vertical is the natural slack created by the deflection of the inner wire.
The three-phase arrangement of the overhead line shall comply with the following requirements: the conductor arrangement sequence of the left-hand load is L1, N, L2, L3, and the neutral line is usually dependent on the road side of the pole. The poles are generally erected on the north and east sides of the road.
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Yincun Economic Development Zone, Renqiu City, Cangzhou City, Hebei Province