Grounding method for composite insulating pole tower of power transmission line and pole tower thereof
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A technology of composite materials and transmission lines, applied in the configuration of grounding wires, connecting contact materials, etc., can solve the problem that the lightning protection line has no direct grounding path, and achieve the effect of less possibility of being stolen, lower cost, and save width
Active Publication Date: 2012-11-07
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology
When the composite material is used as the line tower, due to the insulation of the composite material, the lightning conductor has no effective direct grounding path
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Embodiment 1
[0024] 110kV transmission line composite tower, can adopt the above grounding method. like figure 2 As shown, the main technical parameters of the tower can take the following values: C1=3.5m, C2=3.0m, r≈0.2m, B≈1.5m, d=10mm, D1=1.5m, D3=3.0m, cancel D2, that is Do not drill holes in the shaft to install down-conductor electrodes. With this scheme, firstly, the gap distance between towers meets the design requirements of 110kV line, and can meet the operation requirements of 110kV line in terms of electrical performance; secondly, it also has the following advantages:
[0025] (1) Using this grounding method effectively utilizes the insulation of the shaft and provides lightning overvoltage flashover clearance;
[0026] The 110kV phase-to-ground insulation distance is mainly controlled by lightning overvoltage, and it is dominated by lightning strikes. The phase-to-ground insulation of composite rods mainly includes: air gap insulation with a distance of D1 (1.5m), and com...
Embodiment 2
[0038] 220kV transmission line composite tower, can adopt the above grounding method. like figure 2 As shown, the main technical parameters of the tower can take the following values: C1=5.5m, C2=5.0m, r≈0.3m, B≈2.4m, d=15mm, D1=2.5m, D3=5.0m, D2=2.7m . Firstly, the gap distance between towers meets the design requirements of 110kV line, and can meet the operation requirements of 220kV line in terms of electrical performance; secondly, it also has the following advantages:
[0039] (1) Using this grounding method effectively utilizes the insulation of the shaft and provides lightning overvoltage flashover clearance;
[0040] The 220kV phase-to-ground insulation distance is mainly controlled by lightning overvoltage. The phase-to-ground insulation of composite material rods mainly includes: air gap insulation with a distance of D1 (2.5m), air gap insulation with a distance of D2 (2.7m), and air gap and thickness with a distance of (r+B) (2.7m) Combination insulation of ins...
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Abstract
The invention discloses a grounding method for a composite insulating pole tower of a power transmission line and a pole tower thereof. The pole tower main body adopts a composite tube, a conductor cross arm adopts a composite insulator, a ground wire cross arm adopts a metal conductor, a grounding down-lead adopts a metal wire or a tube or a bar, the grounding down-lead is suspended from the middle of the tube and is led down to be grounded, the ground wire cross arm and the conductor cross arm are provided with metal electrodes, and the proper part of the pole tower is perforated for arranging the grounding down-lead to lead out the electrodes; and the air gap distance between the ground wire side electrode and the conductor side electrode and the air gap distance between the leading-out electrode of the grounding down-lead and the conductor can be determined according to the lightning protection requirement. The grounding mode of the composite pole tower effectively utilizes the insulating property of a composite pole, can improve the pollution flashover and ice flashover resistance, wind deflection prevention and lightning protection level of the line, can also compress the size of a tower head, and has the advantages of reducing the manufacturing cost and the transportation, assembly and maintenance expenses of the pole tower main body and reducing corridor width of the line at the same time.
Description
technical field [0001] The invention belongs to the field of power transmission lines, and in particular relates to a method for grounding a power transmission line composite material insulation pole tower and the pole tower. Background technique [0002] Towers are important equipment for transmission lines. At present, transmission lines with a voltage level of 110kV and above in my country mostly use iron towers. The disadvantages are that they are easy to corrode, heavy in weight, easy to be stolen, and prone to wind deflection, pollution flashover, and ice in harsh natural environments. Lightning strikes, lightning strikes, etc., cause line trips or even outage accidents. [0003] Composite materials have the characteristics of light weight, high strength, good insulation, anti-climate aging, and strong corrosion resistance. Applying composite materials to transmission line towers can greatly improve the insulation of the line, and greatly improve the line's resistance t...
Claims
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