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The Influence of Local Thermodynamic Equilibrium State on the Composition Characteristic of the Discharge on Overhead Line Part II: The Arc Under the Polluted Icing Condition

Lookup NU author(s): Professor Vladimir TerzijaORCiD

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Abstract

Partial arcs, a form of destructive gas discharge occurring on ice-covered electric apparatus (including insulators, bushings, and conductors, etc.), pose significant risks of flashover accidents and potential power outages. As particle composition characteristics represent a fundamental physical property critical for arc discharge modeling and insulation design, this study investigates these characteristics under icing conditions through combined spectrographic experiments and numerical simulations, with particular emphasis on analyzing the influence of the arc’s non-local thermodynamic equilibrium (non-LTE) state. To overcome the nonlinearity challenges in determining initial values for newly introduced particles under icing and soluble contamination conditions, this paper developed a novel composition perturbation iterative method accompanied by a specialized algorithm. This paper’s findings demonstrate nonlinear behavior in 11 particle species across varying contamination mole ratios, revealing that while increased non-LTE states initially enhance ionization reactions before subsequently inhibiting them, they consistently promote dissociation reactions. Furthermore, elevated non-LTE states reduce the required gas temperature for electrons and negative ions to achieve peak densities. The insights gained from this research provide fundamental references for arc modeling, insulation coordination, and further investigations into the physical properties of arcs on ice-covered electric apparatus, while the proposed numerical methods offer an effective solution for addressing initial value problems in high-voltage engineering when dealing with novel electrical dielectrics.

Publication metadata

Author(s): Meng W, Li J, Li Q, Kopsidas K, Hu J, Terzija V, Jiang X, Wang Z

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Dielectrics and Electrical Insulation

Year: 2025

Pages: Epub ahead of print

Online publication date: 15/10/2025

Acceptance date: 02/04/2018

ISSN (print): 1070-9878

ISSN (electronic): 1558-4135

Publisher: IEEE

URL: https://doi.org/10.1109/TDEI.2025.3622093

DOI: 10.1109/TDEI.2025.3622093

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