摘要 :
The major requirement of telecommunications outside network products is to satisfy the performance requisites concerning the various environments in which they are applied. Countries such as Brazil, with large extensions located i...
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The major requirement of telecommunications outside network products is to satisfy the performance requisites concerning the various environments in which they are applied. Countries such as Brazil, with large extensions located in tropical regions, have demanded products designed to specific needs, adjusted technologically to the diverse environments, in order to provide telecommunications network reliability and optimized durability in terms of the cost-benefit ratio. Considering climatic factors such as temperature, relative humidity and atmospheric pollutants, three localities from the five described by Koeppen [1] were selected: Manaus, Fortaleza and Sorocaba. The cables were exposed for 18 months in field. Every three months the samples were removed and submitted to laboratory tests for electric resistivity, tensile test, and visual examination. Salt spray, sulphur dioxide and temperature and humidity assays were carried out in order to simulate the field conditions. In these accelerated ageing assays, the visual and mechanical performance was evaluated. For the environmental characterization, there was a follow-up of parameters of temperature, humidity and pollutants derived from chlorine and sulfur.
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摘要 :
The major requirement of telecommunications outside network products is to satisfy the performance requisites concerning the various environments in which they are applied. Countries such as Brazil, with large extensions located i...
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The major requirement of telecommunications outside network products is to satisfy the performance requisites concerning the various environments in which they are applied. Countries such as Brazil, with large extensions located in tropical regions, have demanded products designed to specific needs, adjusted technologically to the diverse environments, in order to provide telecommunications network reliability and optimized durability in terms of the cost-benefit ratio. Considering climatic factors such as temperature, relative humidity and atmospheric pollutants, three localities from the five described by Koppen [1] were selected: Manaus, Fortaleza and Sorocaba. The cables were exposed for 18 months in field. Every three months the samples were removed and submitted to laboratory tests for electric resistivity, tensile test, and visual examination. Salt spray, sulphur dioxide and temperature and humidity assays were carried out in order to simulate the field conditions. In these accelerated ageing assays, the visual and mechanical performance was evaluated. For the environmental characterization, there was a follow-up of parameters of temperature, humidity and pollutants derived from chlorine and sulfur.
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摘要 :
The adequate performance of outside telecommunications network products depends on their capacity of best answering to performance requisites demanded by the operational environments. Countries located in tropical regions, such as...
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The adequate performance of outside telecommunications network products depends on their capacity of best answering to performance requisites demanded by the operational environments. Countries located in tropical regions, such as Brazil, have more and more required customized products. However, its particular environmental features demand quick answers in terms of technology, in order to provide reliability and optimized durability for such products according to the best cost/benefit ratio. Considering climatic factors such as temperature, relative humidity and atmospheric pollutants, two localities from the five described by Koppen were selected: Manaus e Fortaleza, The cables were exposed for 18 months in field. Every three months the samples were removed and submitted to laboratory tests for electric resistivity, tensile test, and visual examination. For the environmental characterization, there was a follow-up of parameters of temperature, humidity and pollutants derived from chlorine and sulfur.
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摘要 :
The adequate performance of outside telecommunications network products depends on their capacity of best answering to performance requisites demanded by the operational environments. Countries located in tropical regions, such as...
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The adequate performance of outside telecommunications network products depends on their capacity of best answering to performance requisites demanded by the operational environments. Countries located in tropical regions, such as Brazil, have more and more required customized products. However, its particular environmental features demand quick answers in terms of technology, in order to provide reliability and optimized durability for such products according to the best cost/benefit ratio. Considering climatic factors such as temperature, relative humidity and atmospheric pollutants, two localities from the five described by Koeppen were selected: Manaus e Fortaleza. The cables were exposed for 18 months in field. Every three months the samples were removed and submitted to laboratory tests for electric resistivity, tensile test, and visual examination. For the environmental characterization, there was a follow-up of parameters of temperature, humidity and pollutants derived from chlorine and sulfur.
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摘要 :
The adequate performance of outside telecommunications network products depends on their capacity of best answering to performance requisites demanded by the operational environments. Countries located in tropical regions, such as...
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The adequate performance of outside telecommunications network products depends on their capacity of best answering to performance requisites demanded by the operational environments. Countries located in tropical regions, such as Brazil, have more and more required customized products. However, its particular environmental features demand quick answers in terms of technology, in order to provide reliability and optimized durability for such products according to the best cost/benefit ratio. Considering climatic factors such as temperature, relative humidity and atmospheric pollutants, two localities from the five described by Koeppen were selected: Manaus e Fortaleza. The cables were exposed for 18 months in field. Every three months the samples were removed and submitted to laboratory tests for electric resistivity, tensile test, and visual examination. For the environmental characterization, there was a follow-up of parameters of temperature, humidity and pollutants derived from chlorine and sulfur.
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摘要 :
The performance and lifetime of an OPGW cable depend on several factors and processes. The process starts with the steel wire surface preparation for galvanizing, that is, cleaning and pickling. During the galvanizing step, a grea...
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The performance and lifetime of an OPGW cable depend on several factors and processes. The process starts with the steel wire surface preparation for galvanizing, that is, cleaning and pickling. During the galvanizing step, a great deal of attention must be paid to the preparation and maintenance of the zinc bath, mainly its temperature. A good surface and bath preparation will assure uniform and adherent coating. In the cable manufacturing and installation step, the wires are stressed which damage the coating layer. In the field, the OPGW cables are exposed to aggressive agents, including those from the environment and those related to installation, maintenance and operation. The defective spots become prone to corrosion and, depending on the extent of such defects; this may result in mechanical damage. Therefore, it is important to estimate the minimum thickness of the zinc layer necessary to maintain its mechanical strength and corrosion resistance, as well as to evaluate the micro structural characteristics of the galvanized wire. This paper describes the preparation of defects different size in the coating of wires from 2.67 to 3.09 mm diameter. Several mechanical, climatic, thickness measurements and thickness uniformity tests have been carried out on the wires, which were then assessed by scanning electronic microscopy, in order to evaluate the influence of defects on the mechanical performance and on the corrosion behavior.
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摘要 :
The performance and lifetime of an OPGW cable depend on several factors and processes. The process starts with the steel wire surface preparation for galvanizing, that is, cleaning and pickling. During the galvanizing step, a grea...
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The performance and lifetime of an OPGW cable depend on several factors and processes. The process starts with the steel wire surface preparation for galvanizing, that is, cleaning and pickling. During the galvanizing step, a great deal of attention must be paid to the preparation and maintenance of the zinc bath, mainly its temperature. A good surface and bath preparation will assure uniform and adherent coating. In the cable manufacturing and installation step, the wires are stressed which damage the coating layer. In the field, the OPGW cables are exposed to aggressive agents, including those from the environment and those related to installation, maintenance and operation. The defective spots become prone to corrosion and, depending on the extent of such defects; this may result in mechanical damage. Therefore, it is important to estimate the minimum thickness of the zinc layer necessary to maintain its mechanical strength and corrosion resistance, as well as to evaluate the micro structural characteristics of the galvanized wire. This paper describes the preparation of defects different size in the coating of wires from 2.67 to 3.09 mm diameter. Several mechanical, climatic, thickness measurements and thickness uniformity tests have been carried out on the wires, which were then assessed by scanning electronic microscopy, in order to evaluate the influence of defects on the mechanical performance and on the corrosion behavior.
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摘要 :
^7fThe performance and lifetime of an OPGW cable depend on several factors and processes. The process starts with the steel wire surface preparation for galvanizing, that is, cleaning and pickling. During the galvanizing step, a g...
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^7fThe performance and lifetime of an OPGW cable depend on several factors and processes. The process starts with the steel wire surface preparation for galvanizing, that is, cleaning and pickling. During the galvanizing step, a great deal of attention must be paid to the preparation and maintenance of the zinc bath, mainly its temperature. A good surface and bath preparation will assure uniform and adherent coating. In the cable manufacturing and installation step, the wires are stressed which damage the coating layer. In the field, the OPGW cables are exposed to aggressive agents, including those from the environment and those related to installation, maintenance and operation. The defective spots become prone to corrosion and, depending on the extent of such defects; this may result in mechanical damage. Therefore, it is important to estimate the minimum thickness of the zinc layer necessary to maintain its mechanical strength and corrosion resistance, as well as to evaluate the micro structural characteristics of the galvanized wire. This paper describes the preparation of defects different size in the coating of wires from 2.67 to 3.09 mm diameter. Several mechanical, climatic, thickness measurements and thickness uniformity tests have been carried out on the wires, which were then assessed by scanning electronic microscopy, in order to evaluate the influence of defects on the mechanical performance and on the corrosion behavior.
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