Algorithm and framework for tower fault caused by ice overload

https://doi.org/10.1016/j.engfailanal.2020.105126Get rights and content

Highlights

  • To establish the root cause analysis method, for towers collapses located in the Andean mountains.

  • Framework and algorithm is proposed for new design associated to ice loads.

  • Ice loads in cables would be dangerous to the towers at the near future.

Abstract

In the last years, energy transmission companies has challenges in ice conditions caused by climatic change around the world. Overhead lines could be affected for the ice overload over the cable. Especially in Andean mountains higher than 4500 m above mean sea level (mamsl). The target of this study is to establish the root cause analysis and conditions, for towers collapses located in the Andean mountains and the recommendations at the design stage. It is a contribution to new transmission systems associated to climate change; it has dramatically changed the cold and freezing stages in the Peruvian Andes, if this new considerations has not been implemented, then, the towers could be in a degradation process at the near future.

Introduction

Ice loads have caused several failures in towers associated a large overhead lines in mountains. If this transmission line is not design with reliability topology, as rings configuration. The cold phenomena, where each year the layer of ice and snow is increased during the last twelve years [1]. Due to the snow condition, above 4500 mamsl, therefore the developments, criteria and engineering, these countries should apply with care in these different tropical environmental conditions [3]. The analysis should identify the ice composition (ice, snow, frost) to describe the states of frozen water [4].

The objective of this research is to propose a root cause methodology for ice loads influence in transmission lines failures. The promising application of this methodology is to obtain new input data for an assessment for the transmission lines located above 4500 mamsl and the new projects.

This research has been structured as follows: The Section 2 described the methodology and description of the influence of the ice associated to transmission lines, loads, ice acceleration in structures, cables, national with international standards associated to recommend the best practices about this meteorological condition and risk. Section 3, a case study developed with the information of a critical overhead lines with structures in Andean mountain. In the Section 4 a discussion about the assessment of the structures and risk in these structures; finally in the Section 5 a new recommendation for the international standards.

Section snippets

Ice influnce description

  • From the meteorological point of view, frozen water or ice can be classified into several types of ice or snow, depending on the mechanism of formation and properties, as follows:

  • The hail is water frozen, droplets inside the clouds, which, after several cycles of accretion due to rising winds, fall to the ground due to excessive weight [9].

  • The dry snow composed of water crystals, grouped in flakes that fall to the ground because of their weight, when the temperature is below 0 C. Snow is formed

Case study

A freeze defined as the meteorological event in which the temperature in the ground drops below 0 C, one of the conditions for the formation of ice sleeves. In fact, the formation of these ice mats only occurs in the range between 0 C and −10 C. At lower temperatures, the air devoid of moisture that can provide material for accretion by frosting and the possibility of over-cooled liquid rains, in the Fig. 5.

The map of Fig. 5, it indicates the area of Peru where there is a risk of frost. The

Discussion

The stage division of the ice disaster is composed of four stages: Preconditions (associated to the pre-failure period), steady-state progression and multiple failures (during disaster period) and restoration (post-failure period) [38]; recent papers have indicated effective resilience enhancement framework for towers installed, however, the recommendations for new assets are not considered.

The model data, loads, load combinations and the results of the analysis and Design (check for

Conclusion

This research has provided a new methodology in the Fig. 3 and an algorithm for the assessment for the design review and new projects for the Andean Mountain with an altitude over the 4000 mamsl. The ice load has big influence in the fragility and modelling of the overhead lines towers subjected to ice, wind and extreme environmental condition. Due to wind speed, the wind angle of the attack, the distance between towers, horizontal span during the normal operation and construction (rupture of

Grants / financial support

None.

CRediT authorship contribution statement

Ricardo Manuel Arias Velásquez: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Data curation, Writing - original draft, Writing - review & editing, Visualization, Supervision, Project administration. Jennifer Vanessa Mejía Lara: Methodology, Validation, Formal analysis, Investigation, Data curation, Writing - original draft, Writing - review & editing, Visualization.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgements

Author would like to thanks to Universidad Nacional de San Agustín de Arequipa.

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