Impact of Air Gap Defects on the Electrical and Mechanical Properties of a 320 kV Direct Current Gas Insulated Transmission Line Spacer

Deng, Yuan; Fan, Xianhao; Luo, Hanhua; Wu, Kai; Liang, Fangwei; Li, Chuanyang

doi:10.3390/en16104006

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…Physical response processes during charge carrier migration correlate with carrier energy levels, in which charge recombination does not require any threshold and can occur at a low electrical field [19] . Mobile space charges possessing kinetic energy of 1.5 gap energy (E g ) can generate electron-hole pairs via impact ionization, while electronically excited states can be induced by electrons with kinetic energy below the ionization energy level [24] . As to the applied 50 Hz AC voltage, charge injection into the dielectric proceeds mainly concentrated in the surface layer of insulation material.…”

Section: Discussionmentioning

confidence: 99%

Photon Count Technique as a Potential Tool for Insulation Micro-Defect Detection: Principles and Primary Results

Fan,

Luo,

Liang

et al. 2023

iEnergy

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The requirements for the construction of a new power system inevitably pose significant challenges and changes to the operation and maintenance of the power grid. To ensure the safe and stable operation of ultra-high voltage (UHV) transmission equipment, this work reports on the principles and preliminary results of using electroluminescence (EL)-based photon counting (PC) methods for early detection of micro-defects in GIS/GIL insulation spacer. In this study, the impact of voltage, gas pressure, and gas composition on the photon response of insulation is examined. Furthermore, the corresponding relationship between defect status and photon response characteristics is explored, along with the discussion of the EL mechanism and its evolution induced by defects. The research results demonstrate that PC measurement exhibits high sensitivity to variations in millimeter-scale defect size, position, and morphology at lower electric fields before partial discharge (PD) initiation. With this regard, this paper reveals promising prospects for the early detection of micro-defects in UHV transmission equipment using PC measurement-based methods.

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Section: Discussionmentioning

confidence: 99%

Photon Count Technique as a Potential Tool for Insulation Micro-Defect Detection: Principles and Primary Results

Fan,

Luo,

Liang

et al. 2023

iEnergy

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“…in an AC cycle reached 19.27 times from the EL inception (at 2 kV) to stable luminescence (at 5 kV). This is mainly attributed to the concentration of local electric field intensity induced by a severe scratch defect [26].…”

Section: Phase-resolved Photon Countingmentioning

confidence: 99%

Detection of defect-induced luminescence in epoxy-based insulation materials via phase-resolved photon counting method

Fan,

Liang,

Luo

et al. 2024

J. Phys. D: Appl. Phys.

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Electroluminescence (EL) has shown promise in detecting micro-defects in epoxy-based insulation materials. Understanding the various luminescence mechanisms caused by defects is crucial for improving the characterization and analysis of insulation defects. In light of this, this study proposes a photon counting-based approach to investigate the impact of defects on the entire evolutionary process of the luminescence mechanism. A phase-resolved photon counting (PRPC) method is proposed to examine the polarity and periodicity of photon counting results influenced by defects. Additionally, a simulation model based on the finite element method (FEM) is established to analyze how defects modify the distribution of electric field and space charges. Observations suggest that the PRPC-based approach holds promise for advancing the defect analysis of epoxy insulation used in gas-insulated equipment.

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“…The insulated pull rod is a crucial insulating component in gas-insulated, metaleclosed switchgears (GISs) characterized by its slender, elongated structure and frequent involvement in disconnection scenarios [1][2][3][4][5]. In operational conditions, it is subjected to significant mechanical stress and impact vibrations, necessitating superior electrical insulation and mechanical strength [2,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Characterization of Micro-Discharge Phenomena Induced by Glitch Micro-Defects on an Insulated Pull Rod Surface

Niu,

Li,

Liang

et al. 2024

Energies

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The reliability of GIS (gas-insulated switchgear) circuit breakers significantly depends on the condition of the insulated pull rods, with micro-defects on their surface posing a potential risk for micro-discharges and breakdown incidents. Experimentally investigating these micro-discharges is challenging due to their minute nature. This study introduces a framework to examine the linkage between micro-defects and micro-discharges, coupled with numerical simulations of the micro-discharge process in insulated pull rods afflicted by surface infiltration flaws under operational conditions. Initially, samples containing micro-defects were sectioned via water jet cutting for microstructural analysis through white light interferometry. Subsequently, a two-dimensional axisymmetric model simulating positive corona discharge from a needle to a plate electrode was employed to derive the relationship between charged particle density and the electric field in SF6 and air. Building on these observations, a micro-discharge model specific to micro-defects was developed. Comparative analysis of micro-discharge behaviors in SF6 and air for identical defect types was conducted. This research framework elucidates the discharge dynamics of charged particles in SF6 and air during micro-discharge events, shedding light on the mechanisms underpinning micro-discharges triggered by insulation rod defects.

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Impact of Air Gap Defects on the Electrical and Mechanical Properties of a 320 kV Direct Current Gas Insulated Transmission Line Spacer

Cited by 5 publications

References 26 publications

Photon Count Technique as a Potential Tool for Insulation Micro-Defect Detection: Principles and Primary Results

Photon Count Technique as a Potential Tool for Insulation Micro-Defect Detection: Principles and Primary Results

Detection of defect-induced luminescence in epoxy-based insulation materials via phase-resolved photon counting method

Simulation and Characterization of Micro-Discharge Phenomena Induced by Glitch Micro-Defects on an Insulated Pull Rod Surface

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