Thermodynamic model of critical ice-melting current on iced transmission lines

Zhu, Youwen; Huang, Xinbo; Zhao, Long; Tian, Yousheng; Mu, Jing-Yu; Gao, Hua

doi:10.2298/tsci170916137z

Cited by 4 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4.36 (7) where U f flashover voltage, kV; A A constant, obtained from test results; b pollution influence characteristic index; pollution degree of insulator mg/cm 2 ; H height, km; W weight of ice on the insulator, kg/piece.…”

Section: ) Insulator Flashover Modelmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Simulation of Power Systems Considering Transmission Lines Icing and Insulators Flashover in Extreme Weather

et al. 2022

View full text Add to dashboard Cite

Global climate deterioration caused by excessive carbon emissions poses a severe threat to the stable operation of power systems. In extreme snow and ice weather, complex faults, such as ice-covered line breakage and insulator flashover, may be triggered. Hybrid simulations to reveal the influence mechanism and dynamic interaction process between extreme weather and power systems have become a research focus. Relationship models between meteorological conditions and grid failure were constructed in ice accretion and insulator flashover scenarios. Based on the above two models, a multi-variable and multi-time scale hybrid simulation of the meteorological process and power system, considering line icing and insulator flashover, was realized. An example was provided to verify the feasibility of the proposed simulation scheme.INDEX TERMS Extreme snow and ice weather, line icing, insulator flashover, hybrid simulation.

show abstract

Section: ) Insulator Flashover Modelmentioning

confidence: 99%

“…In recent years, researchers have deployed new models that consider more factors. In [7], a model was proposed to simulate the critical ice-melting current on an iced conductor.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation of Power Systems Considering Transmission Lines Icing and Insulators Flashover in Extreme Weather

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Jiang Quancai et al established a finite element model of a tower-line system and used the harmonic superposition method to simulate the time course of the pulsating wind speed at the height of the conductor to explore the effect of the pulsating wind speed on the bouncing process induced by ice shedding [19]. Other studies have analyzed the effects of icing morphology and wind attack angle on icing protection, respectively [20,21]. Bian Rong et al considered the sudden change in the wind load caused by changes in the aerodynamic shape and the aerodynamic parameters at the moment of ice shedding, and analyzed the functional relationship between the maximum ice shedding jump height of a conductor and the difference in the sag in the stationary state before and after ice shedding [22].…”

Section: Introductionmentioning

confidence: 99%

Study on the Bouncing Process Induced by Ice Shedding on Overhead Conductors under Strong Wind Conditions

Dong,

Zhao,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Strong winds can lead to more complex ice shedding oscillation processes for overhead conductors, inducing flashovers, strand breakages and other accidents. This study analyzes the aerodynamic parameters of several typical icing features and establishes a numerical model for ice shedding on overhead conductors under strong wind conditions. The results show that for the same amount of icing, the resistance and lift force on the conductor changes with ice shape, wind attack angle and wind speed, which has a significant effect on the ice shedding jumping process. When the wind attack angle approaches 180°, the airflow resistance of the fan-shaped and D-shaped icing conductors significantly increases. And in the process of ice shedding response of transmission lines, the lateral amplitude may exceed 20 m, which increase the discharge risk of horizontally arranged conductors. Moreover, for the significant lateral oscillation of conductors by ice shedding under strong wind, the maximum horizontal displacement is approximately 1.6 times the difference in lateral position before and after ice shedding.

show abstract

“…By far, in power transmission system most of the research on ice melting mainly focuses on the thermal melting of iced overhead lines, and methods such as DC melting method, AC melting method, and pulse current melting have been proposed [6][7][8][9]. However, due to differences in energy sources and icing structures, the above methods cannot be directly used to predict the melting time of insulators.…”

Section: Introductionmentioning

confidence: 99%

“…And under the influence of the inconstant meteorological conditions, the melting water may freeze again [10][11][12], called "freeze-thaw cycle", as a result, the model of icing and melting for iced insulator is very complicated. Moreover, due to the complexity of the morphology of insulator's icing, parameters such as convection heat transfer and heat conduction cannot be directly calculated by empirical formulas [9,13], which also requires to model for the iced insulators, and updates the model constantly according to the icing morphology.…”

Section: Introductionmentioning

confidence: 99%

Study on natural ice-melting process of insulator by thermodynamic analysis

et al. 2022

Self Cite

View full text Add to dashboard Cite

Insulator flashover caused by atmospheric icing is a serious accident with high frequency. The flashover risk on insulators during ice-melting process is higher than that during icing accretion process. Therefore, it is of great theoretical significances and engineering value to carry out research on risk prediction methods of ice-melting flashover on insulators. Firstly, this paper presents a thermal balance equation of the iced insulator surface for icing natural melting process and calculates the main influencing parameters of the ice-melting process by thermodynamic analysis. Secondly, this paper extracts the meteorological data from great numbers of on-site ice-melting flashover cases to calculate the meteorological condition with the highest flashover risk. On the basis of this, to judge the state of freezing or melting, a thermodynamic criterion of freezing and melting state is proposed, and the finite element analysis is applied to model iced and non-iced insulators, and the temperature distribution, the wall heat transfer coefficient distribution of the airflow field are analyzed. The results suggest that the local micrometeorological temperature and the heat transfer coefficient have the greatest impact on the ice-melting process of insulators. The structure of insulator will be changed by the covered ice, ended up to a cone-like structure which will weaken the influence of the vortex on the central leeward side. And the heat dissipation and melt characteristics of iced insulator will be quite different from that of non-iced insulator.

show abstract

Thermodynamic model of critical ice-melting current on iced transmission lines

Cited by 4 publications

References 20 publications

Dynamic Simulation of Power Systems Considering Transmission Lines Icing and Insulators Flashover in Extreme Weather

Dynamic Simulation of Power Systems Considering Transmission Lines Icing and Insulators Flashover in Extreme Weather

Study on the Bouncing Process Induced by Ice Shedding on Overhead Conductors under Strong Wind Conditions

Study on natural ice-melting process of insulator by thermodynamic analysis

Contact Info

Product

Resources

About