Wood cross-arms coated with polyurethane resin - tests and numerical simulations

Altafim, Ruy Alberto Corrêa; Silva, José Francisco Resende da; Gonzaga, D.P.; Ribeiro, Cacilda de Jesus; Godoy, João Ruffin Leme de; Basso, Heitor Cury; Bueno, Benedito de Souza; Júnior, Carlito Calil; Sartori, José Carlos; Silveira, A.

doi:10.1590/s1516-14392006000100015

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…National standards on crossarms specify the relevant timber species to be used in producing crossarms considering the strength and durability ratings. Some researchers have explored employing native timber species with lower durability ratings to be used as crossarms by improving the durability through coating with resins (e.g., [44,45]). The resincoated crossarms exhibited improved mechanical and durability properties, complying with the national standard specifications.…”

Section: Strengthening Methods For In-service Crossarm and Alternate ...mentioning

confidence: 99%

Structural Assessment Techniques for In-Service Crossarms in Power Distribution Networks

et al. 2022

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Crossarms are widely used in power distribution and telecommunication sectors to support overhead cables. These structures are horizontally attached to the top of vertically erected utility poles and are essential elements in connecting overhead cables to the poles. Timber is the dominantly used material type for crossarms in the existing distribution networks. Nevertheless, there are alternative crossarms made from steel, composites, polymers, and even from concrete. This paper reviews the studies on the condition assessment of timber crossarms considering the aspects of decay identification and flexural strength assessment. The limitations and shortcomings of the conventional inspection techniques for crossarms are presented. Then, the studies on the developments of non-destructive test methods to address these issues are reviewed. Further, the results from the experimental work conducted to assess the structural capacity of in-service crossarms are presented and analysed. In addition, the possible future advancements of alternative crossarm types are also discussed, considering the mechanical strength, durability performance, and sustainability aspects. This paper aims to highlight the advantages and disadvantages of different condition assessment techniques for crossarms, indicating the importance of an integrated approach combining both the conventional and non-destructive testing techniques.

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Section: Strengthening Methods For In-service Crossarm and Alternate ...mentioning

confidence: 99%

Structural Assessment Techniques for In-Service Crossarms in Power Distribution Networks

et al. 2022

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“…has found that laminated wood cross-arms can offer an economically feasible alternative at a cost equal to or lower than solid sawn cross-arms [6]. In this context, although laminated wood is an alternative material for Brazil, reforested Eucalyptus citriodora, which satisfy the strength, electrical and thermal requirements for solid sawn cross-arms [7], are also economically suitable, if it receives special protective surface treatment against fungi and microorganisms [8].…”

Section: Figure 1 -Sample Image Captured From Inspection Robot Cameramentioning

confidence: 99%

“…Given the different aspects of the aforementioned cross-arms, this paper presents an adaptive digital image-processing algorithm to allow inspection of cross-arms with identification of two kinds: reforested Eucalyptus citriodora without superficial treatment; and reforested Eucalyptus citriodora with a polyurethane protective treatment [8]. In the identification process, the algorithm defines a region of interest using techniques of preprocessing and image segmentation.…”

Section: Figure 1 -Sample Image Captured From Inspection Robot Cameramentioning

confidence: 99%

Cross-arms Identification with Adaptive Digital Image Processing

Silva¹,

Altafim²,

Hirakawa³

2015

IJCA

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This paper presents an adaptive digital image processing algorithm to improve the identification and classification process of wood cross-arms in the context of automated image inspection robot for distribution power lines. Processing of images that come from outdoor environment is a very difficult task due to the interference of variation of lightning conditions, especially over non uniform objects like wood cross-arms. Usual approaches take advantage of threshold and reference variation in accordance to the best condition to extract desired image object. The proposed adaptive algorithm is based on the Adaptive Digitized Straight Line Segments (ADSLS) that sum up the capability of dynamic change of image segmentation process like binarization and contour extraction. Proposed algorithm was tested on the identification and classification of different type of wood cross-arm with polyurethane protective treatment and results shown improvement in the image segmentation process.

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“…Among other characteristics, they also present low surface energy which can be explained by the presence of methyl groups on their surface. In fact, these materials are water-repellent, also called hydrophobic 4 . The hydrophobicity classification (HC) is defined by the STRI guide 5 , by measuring the contact angle or the amount of the wetted insulator surface.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobicity classification of polymeric materials based on fractal dimension

2008

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This study proposes a new method to obtain hydrophobicity classification (HC) in high voltage polymer insulators. In the method mentioned, the HC was analyzed by fractal dimension (fd) and its processing time was evaluated having as a goal the application in mobile devices. Texture images were created from spraying solutions produced of mixtures of isopropyl alcohol and distilled water in proportions, which ranged from 0 to 100% volume of alcohol (%AIA). Based on these solutions, the contact angles of the drops were measured and the textures were used as patterns for fractal dimension calculations.

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Wood cross-arms coated with polyurethane resin - tests and numerical simulations

Cited by 6 publications

References 2 publications

Structural Assessment Techniques for In-Service Crossarms in Power Distribution Networks

Structural Assessment Techniques for In-Service Crossarms in Power Distribution Networks

Cross-arms Identification with Adaptive Digital Image Processing

Hydrophobicity classification of polymeric materials based on fractal dimension

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