引下线夹/ Download Clamp
钢带抱箍/ Stainless steel tape, 橡胶夹具/ Cable clamp, 塔用夹具/ Tower clamp
功能用途/ Function and Purpose
The main function of the download clamp is to fasten cables to the poles in order to protect them from shake and abrasion.
产品特点/ Product characteristic
² Cable clamp is made of EPDM.
² Tower clamp is made of galvanized steel.
选型方法/ Lectotype Method
² 1 set every 1.5 m.
² Supply the diameter of the Installation point of the poles.
² According to the diameter of ADSS.
² 2 sets / Strain tower
² 1 set / Strain pole
Comparison of construction scheme of OPGW cable and ADSS cable hardware. The following factors shall be considered during construction:
① The safety factor of OPGW composite optical cable ground wire shall not be less than 2.5, and shall be greater than the design safety factor of conductor. The average working stress shall not exceed 25% of the failure stress.
② The distance between conductor and OPGW composite optical fiber ground wire shall meet the lightning protection requirements.
③ OPGW composite optical fiber ground wire shall meet the requirements of thermal stability during normal operation and accident.
ADSS optical cable is a kind of all dielectric self-supporting optical cable. In order to meet the lightning protection requirements of the collecting line, a common ground wire needs to be set up at the same time.
The following factors shall be considered in the construction of ADSS optical cable:
① The safety factor of ADSS optical cable shall not be less than 2.5, and shall be greater than the design safety factor of conductor. The average working stress is generally 18% - 20% of the failure stress. [A / h /] ② ADSS optical cable shall meet the strength and foundation stability checking calculation of vertical tower.
③ ADSS optical cable shall be able to resist electric corrosion, animal bites and abrasion between cable and tower, and can be whipped together with conductor when the wind is biased.
④ Under the action of strong wind or ice, the crossing distance between ADSS cable and the ground has enough margin.
It can be seen that: ① from the perspective of construction and operation and maintenance, 0pcw optical cable has all the functions and performance of overhead ground wire and optical cable, integrating the advantages of machinery, power, power transmission, etc., with high safety, reliability and anti risk ability. One construction and one completion are required for ADSS optical cable; one common ground wire needs to be set up at different installation positions at the same time, and the construction is completed in two times 。 In case of power line accident, normal operation will not be affected, and maintenance can be carried out without power failure during operation and maintenance. ② From the perspective of project cost index, the prohibition of chemical weapons optical cable has higher requirements for lightning protection and higher single cost; without ADSS optical cable as lightning protection, the single cost is lower. However, ADSS cable fittings also need to be installed with lightning protection common ground wire, which needs to increase the construction cost and material cost. At the same time, ADSS cable has higher requirements on the strength of tower erection and communication. Therefore, in terms of overall cost, it is prohibited to use chemical weapon cables to save wind farm investment compared with ADSS cables.