Evaluation of the thermal stresses and dielectric phenomena in the investigation of the causes of wildfires involving distribution power lines

Soulinaris, George K.; Halevidis, Constantinos D.; Polykrati, Aikaterini D.; Bourkas, P.D.

doi:10.1016/j.epsr.2014.07.031

Cited by 18 publications

(7 citation statements)

References 22 publications

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“…Excessive heating may increase the conductor temperature during a short-circuit and caused the rapid expansion of aluminum wires, which can lead to the bird caging event [105]. Conductor temperatures rose from 120 °C to 180 °C during a short-circuit test [117].…”

Section: ) Short-circuitmentioning

confidence: 99%

Review of Thermal Stress and Condition Monitoring Technologies for Overhead Transmission Lines: Issues and Challenges

et al. 2020

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The overhead transmission line system is one of the methods of transmitting electrical energy at a high voltage from one point to another, especially over long distances. The demand for electrical energy is increasing due to the increase in the world population, the evolution of transport technology, and economic expansion, thereby resulting in overloading to the overhead line (OHL) system. In building new infrastructure for transmission lines, several issues need to be addressed. Thus, optimizing existing power by increasing the ampacity of power line is a practical solution to meet energy demand issues. During long-term operation, the temperature of OHL conductors may increase beyond their rated temperature, which is typically 75 °C for conventional conductors such as aluminum-conductor steel-reinforced cable. This condition is defined as thermal stress, which results in lower sag vertical clearance, tensile loss, elongation and creep, and reduced life span of the conductors. This condition must be avoided to ensure that the line is not permanently elongated, which can disrupt the vertical ground clearance, and to expand the conductor's life. Other factors such as lightning, wildfire, aging, and degradation of the conductor can also cause thermal stress on the conductors and have thermal effects on the conductor's performance. Therefore, unwanted thermal stress needs to be examined and identified by monitoring the thermal effect and behavior of the lines. This paper presents the state of the art in monitoring technologies that can be used to identify thermal stress on OHL conductors, including the issues and challenges in monitoring. At the end of this paper, a few suggestions are included to address the occurrence and assessment of thermal stress in lines. Ultimately, this work may provide complete information to researchers and maintenance engineers to enable them to make better decisions on condition monitoring, operation, and maintenance of the system. INDEX TERMS Overhead transmission line, thermal rating, conductor temperature, thermal stress effect, conditioning monitoring.

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Section: ) Short-circuitmentioning

confidence: 99%

Review of Thermal Stress and Condition Monitoring Technologies for Overhead Transmission Lines: Issues and Challenges

et al. 2020

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“…The model proposed in this paper is based on a 3D-FEM model because it is a recognized means to simulate the electromagnetic and thermal behavior of three-dimensional objects with complex shapes [28,29]. The problem under study has to be analyzed by applying a multiphysics approach, since it involves coupled electro-magnetic-thermal physics.…”

Section: The Three-dimensional Finite Element Methods Modelmentioning

confidence: 99%

Three-Dimensional Finite-Element Analysis of the Short-Time and Peak Withstand Current Tests in Substation Connectors

2016

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Abstract:Power devices intended for high-voltage systems must be tested according to international standards, which includes the short-time withstand current test and peak withstand current test. However, these tests require very special facilities which consume huge amounts of electrical power. Therefore, mathematical tools to simulate such tests are highly appealing since they allow reproducing the electromagnetic and thermal behavior of the test object in a fast and economical manner. In this paper, a three-dimensional finite element method (3D-FEM) approach to simulate the transient thermal behavior of substation connectors is presented and validated against experimental data. To this end, a multiphysics 3D-FEM method is proposed, which considers both the connector and the reference power conductors. The transient and steady-state temperature profiles of both the conductors and connector provided by the 3D-FEM method prove its suitability and accuracy as compared to experimental data provided by short-circuit tests conducted in two high-current laboratories. The proposed simulation tool, which was proven to be accurate and realistic, may be particularly useful during the design and optimization phases of substation connectors since it allows anticipating the results of mandatory laboratory tests.

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“…Three-dimensional finite element modelling (3D-FEM) is a powerful and versatile tool that allows simulating the temperature distribution in complex shaped three-dimensional objects such as power connectors, providing accurate solutions when applying a suitable approach [15,16].…”

Section: The 3d-fem Methodsmentioning

confidence: 99%

Finite element analysis to predict temperature rise tests in high‐capacity substation connectors

Capelli

Riba

Sanllehí

2017

IET Generation, Transmission & Distribution

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In the last years there has been a considerable increase in electricity consumption and generation from renewable sources, especially wind and solar photovoltaic. This phenomenon has increased the risk of line saturation with the consequent need of increasing the capacity of some power lines. Considering the high cost and the time involved in installing new power lines, the difficulty in acquiring tower sites and the related environmental impacts, some countries are considering to replace conventional conductors with HTLS (High-Temperature Low-Sag) conductors. This is a feasible and economical solution. In this paper a numerical-FEM (Finite Element Method) approach to simulate the temperature rise test in both conventional and high-capacity substation connectors compatible with HTLS technology is presented. The proposed coupled electric-thermal 3D-FEM transient analysis allows calculating the temperature distribution in both the connector and the conductors for a given current profile. The temperature distribution in conductors and connectors for both transient and steady state conditions provided by the proposed simulation method shows good agreement with experimental data.

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Evaluation of the thermal stresses and dielectric phenomena in the investigation of the causes of wildfires involving distribution power lines

Cited by 18 publications

References 22 publications

Review of Thermal Stress and Condition Monitoring Technologies for Overhead Transmission Lines: Issues and Challenges

Review of Thermal Stress and Condition Monitoring Technologies for Overhead Transmission Lines: Issues and Challenges

Three-Dimensional Finite-Element Analysis of the Short-Time and Peak Withstand Current Tests in Substation Connectors

Finite element analysis to predict temperature rise tests in high‐capacity substation connectors

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