Temperature characteristic of DC ice-melting conductor

Icicles are often formed under the downside surface of conductor in the wet growth icing of overhead power line. When the ice deposit around overhead power line is molten by Joule heat produced by current, the pattern of heat transfer of ice deposit with icicles is dissimilar to that without icicle, so the ice-melting model for the columnar icing conductor cannot be applied to icicle-shaped icing conductor. According to the heat-transfer characteristic of the icicle-shaped icing conductor, this paper puts forward a DC ice-melting model for the icicle-shaped icing conductor. Because this full model includes three-dimensional heat-transfer and interface movement, which cannot be solved in closed form, a finite element scheme in space-domain and a finite difference scheme in time-domain are employed to discretize the governing equations. Firstly the whole ice-melting process on the icicle-shaped icing conductor is simulated by this model. Then the simulated results are validated by ice-melting experiments in the artificial chamber. The study from the model and the experiments shows that the size and length of icicle as well as the space between the adjacent icicles are factors to affect ice-melting. With the shorter icicle space, the bigger icicle size and the longer icicle-length, the surface of ice layer is enlarged and then more heat is taken away by the convection and radiation, so the ice melting time will get longer. power line, icing, ice storm, ice melting, icicle Citation:Fan S H, Jiang X L, Shu L C, et al. DC ice-melting model for wet-growth icing conductor and its experimental investigation.

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“…By variational calculation, eq. (8) can be expressed as [4,5] According to the Galerkin difference scheme [21], eq. (12) can be expressed as …”

Section: Mathematical Modelmentioning

confidence: 99%

“…It is discussed with an emphasis on resisting the icing-accidents of power grid in China after the ice storm of 2008 [5]. A large number of studies concerning ice-melting modeling may be found in the literatures since 1950s when the ice-storm has been regarded as a threat to the power grid [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

DC ice-melting model for wet-growth icing conductor and its experimental investigation

Fan

Jiang

Shu

et al. 2010

Sci. China Technol. Sci.

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“…Cold fog flashover is common in China, but has been classified as pollution flashover even though its process of development and characteristics are significantly different [20]. Few studies with this particular aim have been conducted, and the relationship between the process of development of the flashover arc along insulator surface and environmental factors lacks support from field tests [21]- [23].…”

Section: Introductionmentioning

confidence: 99%

Studying AC Flashover Performance of Suspension Insulators Under Natural Cold Fog and Wet Deposition Conditions

et al. 2020

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“…For transmission line icing, manual deicing or improving line anti-icing designs were the main methods up until recently, but efficiency was low or investment was high. In order to cope with the impact of more and more frequent ice disasters on power system facilities, research into various ice-melting technologies has been receiving more and more attention [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Low-Harmonic DC Ice-Melting Device Capable of Simultaneous Reactive Power Compensation

Zhu

et al. 2018

Energies

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As a result of the high efficiency of ice-melting and the small power supply capacity, DC ice-melting devices are widely used in relation to transmission lines in the power grid. However, it needs to consume reactive power when ice-melting, and voltage fluctuation of the substation may be caused when the demand for reactive power is large. It also generates a large number of 5th and 7th harmonics when ice-melting. In this paper, combined with the demand for ice-melting for transmission lines and the dynamic reactive power of substations, a low-harmonic DC ice-melting device capable of simultaneous reactive power compensation is studied. The function of ice-melting and reactive power compensation can be operated simultaneously and the rectifier's main harmonics can be eliminated. The simulation and experimental research on the device was carried out in the 500 kV Chuanshan substation. The actual ice melting was carried out on the 500 kV Chuansu I line and took only 68 min to melt the ice. The 500 kV bus voltage had no negative deviation, and the positive deviation decreased from +3.09% to +1.57% within 24 h of testing. The results prove the feasibility of the proposed DC ice-melting device in this paper.

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Temperature characteristic of DC ice-melting conductor

Cited by 21 publications

References 8 publications

DC ice-melting model for wet-growth icing conductor and its experimental investigation

DC ice-melting model for wet-growth icing conductor and its experimental investigation

Studying AC Flashover Performance of Suspension Insulators Under Natural Cold Fog and Wet Deposition Conditions

Low-Harmonic DC Ice-Melting Device Capable of Simultaneous Reactive Power Compensation

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