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Open research questions in High voltage insulation and dielectric phenomena

131 gap statements mined from High voltage insulation and dielectric phenomena papers in our 4.5M-paper local library, which holds 1,595 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The intrinsic aging and failure mechanisms of silicone gel are not well understood. The combined effects of high-temperature-induced deterioration of the solid-liquid two-phase structure and subsequent charge dynamic damage initiated by the pulse electric field are not well studied.

    Analysis of Failure Mechanism of Silicone Gel Under High Voltage and High Temperature Aging Conditions · 2026 · DOI

  • The lack of understanding of the degradation characteristics of high-temperature vulcanized silicone rubber in desert regions. The need to screen suitable silicone rubber materials for desert applications. The limited knowledge of the combined synergistic effect of windblown sand erosion and corona aging on silicone rubber materials.

    Surface Erosion–Corona Synergistic Degradation Characteristics and Material Adaptability of High-Temperature Vulcanized Silicone Rubber in Desert Regions · 2026 · DOI

  • Conventional aramid papers have inherently low thermal conductivity. Poor corona resistance accelerates electrothermal aging in conventional aramid papers. The need for simultaneous achievement of high corona resistance and thermal conductivity is identified as a research gap.

    Sandwich‐Structured Aramid Composite Papers with Heterogeneous Dielectric Layers for Integrated Corona Resistance and Thermal Conductivity · 2026 · DOI

  • Further research is needed to explore the long-term stability and durability of the PP/PBE composites. The effect of different elastomer contents and types on the properties of PP/PBE composites should be investigated. The application of PP/PBE composites in high-voltage cables should be further explored.

    Comprehensive Performance Regulation and Characterization of Polypropylene/Elastomer Composite Insulation Materials · 2025 · DOI

  • PP has poor mechanical properties, limiting its application as an insulation material. The lack of a comprehensive performance regulation of PP insulation materials for high-voltage cables. The need for new recyclable cable insulation materials with improved mechanical and electrical properties.

    Comprehensive Performance Regulation and Characterization of Polypropylene/Elastomer Composite Insulation Materials · 2025 · DOI

  • The paper identifies the need for joint campaigns to measure PD/treeing metrics, leakage current, and surface tracking resistance on aged specimens.

    Degradation Pathways of Electrical Cable Insulation: A Review of Aging Mechanisms and Fire Hazards · 2025 · DOI

  • However, the influence of winding temperature on PD behavior remains insufficiently understood.

    Impact of Temperature on Partial Discharge in Generator Stator Windings · 2026 · DOI

  • Epoxy resins are widely employed as insulating materials in ultra-high-voltage (UHV) power equipment thanks to their excellent electrical properties, yet their permanently cross-linked networks are insoluble, infusible and difficult to recycle, and the electrical behavior of their dynamic-bonded counterparts remains poorly understood.

    Dielectric Performance and Reprocessability of Boronic-Ester Vitrimeric Epoxy with Nanoscale Phase Separation · 2026 · DOI

  • Emerging trends, including unmanned aerial vehicle (UAV)-based inspection, synthetic data generation, and autonomous intelligent monitoring, are synthesized to identify open challenges and best practices toward reliable, interpretable, and scalable artificial intelligence (AI)-driven inspection systems.

    Machine Learning and Deep Learning-Based Condition Assessment of Outdoor Ceramic Insulators: A Comprehensive Review · 2026 · DOI

  • However, owing to the absence of a charge accumulation equation for actual insulator surface protrusions, the experimental results are inconsistent with simulation data by the model, failing to adequately reveal the surface charge accumulation mechanism.

    Unraveling Electric-field Dependent Surface Charge Accumulation Mechanisms of Insulator in SF 6 /N 2 · 2026 · DOI

  • At present, the AC breakdown characteristics of short air gaps under different rainfall intensities and wind speeds have rarely been reported.

    Mechanism Analysis of AC Breakdown Voltage Reduction in Short Air Gaps under Combined Strong Wind and Heavy Rain · 2026 · DOI

  • Online infrared inspection has become a powerful approach for identifying faulted composite insulators; however, the mechanisms responsible for their abnormal heating and temperature distribution remain unclear.

    Research on the Mechanisms of Abnormal Heating and Temperature Rise Distribution of the Decay-like Degraded Composite Insulators · 2026 · DOI

  • However, systematic research on erosion-wear characteristics of transmission line composite insulators under extreme sandstorms remains scarce, with a critical shortage of erosion-resistant silicone rubber materials and optimal shed designs for such environments.

    Research on Erosion Resistance Performance Evaluation and Selection of Silicone Rubber Composite Insulators in Desert and Gobi Regions · 2026 · DOI

  • However, a comprehensive understanding of the key factors and critical conditions governing its occurrence is lacking, which hinders accurate condition assessment and increases failure risk.

    The Synergistic Electro-Thermal-Electrochemical Mechanism of Water-blocking Buffer Layer Ablation in High-Voltage Cable · 2026 · DOI

  • Grafting modification is an effective strategy to improve the electrical insulation performance of polypropylene (PP) for high-voltage cable applications; however, the underlying microscopic electronic mechanisms remain insufficiently understood.

    Influence of Grafting Modification on the Intrinsic Electronic Structure of Polypropylene Cable Insulation Materials: Insights from Single-Molecule Density Functional Theory · 2026 · DOI

  • Conventional surface diagnostic methods, such as contact-angle and roughness measurements, are insufficient for reliable classification of chalking severity because the degraded layer is heterogeneous and powdery.

    Physics-Informed Spectral Fusion and Attention-Based Deep Learning for Chalking Severity Classification in Polymeric Insulators · 2026 · DOI

  • However, the underlying electrical-thermal–vibrational aging mechanisms of the dc breakdown performance of EP/GF composites remain unclear.

    Mechanisms for DC Breakdown Strength Degradation in Epoxy/Glass Fiber Composites Under Long-Term Aging · 2025 · DOI

  • Charge trapping by filler is identified as one of the possible factors for suppressing charge accumulation and enhancing breakdown strength, but the role of fillers in trapping phenomena is not fully understood.

    X-Ray Spectroscopic Trap Depth Profiling (X-TDP) for Charge Trap Analysis in Polymer Nanocomposites · 2025 · DOI

  • However, the impact of lightning-induced plasma on the cross-linked polyethylene (XLPE) layer remains unclear when lightning current passes through the cable downlead.

    Insulation Deterioration of Cables as the Downlead for Unibody Composite Pylons Under Lightning Dielectric Barrier Discharge · 2025 · DOI

  • Condenser layer breakdown stands as a particularly destructive failure mechanism in resin-impregnated paper (RIP) bushings, yet its development process remains inadequately understood due to detection challenges.

    Online Detection and Early Warning of Condenser Layer Breakdown in RIP Bushings: An Experimental Investigation · 2025 · DOI

  • Investigating the luminescence process and energy transfer of PI from the point of molecular energy level provides more support for the further study of the aging mechanism and insulation failure of materials.

    Luminescence and Energy Transfer of Polyimide Under Square Wave Voltage · 2025 · DOI

  • Investigating other types of gas-insulated switchgear, - Exploring different materials and designs for eco-friendly switchgear, - Developing more advanced simulation…

    Electric Field Improvement and Insulation Performance Enhancement of a Compact 40.5 kV Eco-Friendly Gas-Insulated Switchgear · 2026 · DOI

  • The compact design of environmentally friendly gas-insulated switchgear is a critical technical challenge - The reduction in enclosure dimensions leads to increased electric field distortion - There is a need for useful engineering references and quantitative data for the ultra-compact design of eco-friendly…

    Electric Field Improvement and Insulation Performance Enhancement of a Compact 40.5 kV Eco-Friendly Gas-Insulated Switchgear · 2026 · DOI

  • The study only investigated the early stage of aging, - The study only used a limited number of cable specimens, - The study only considered thermal aging at a specific temperature…

    Experimental Investigation on the Vector Impedance Characteristics of XLPE Cables at the Early Stage of Aging · 2026 · DOI

  • Joint campaigns where PD/treeing metrics, leakage current, and surface tracking resistance are measured on the same aged specimens, - Investigation of the effect of cable spacing on the combustion behavior of horizontally arranged thermoplastic-insulated cables, - Study of the impact of salt, fly ash, and algae pollutants on polymer…

    Degradation Pathways of Electrical Cable Insulation: A Review of Aging Mechanisms and Fire Hazards · 2025 · DOI

Most-cited papers in High voltage insulation and dielectric phenomena

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Open questions raised by papers listed on this page include: (1) The intrinsic aging and failure mechanisms of silicone gel are not well understood (“Analysis of Failure Mechanism of Silicone Gel Under High Voltage and High…”, 2026); (2) The lack of understanding of the degradation characteristics of high-temperature vulcanized silicone rubber in desert regions (“Surface Erosion–Corona Synergistic Degradation Characteristics and Material…”, 2026); (3) The influence of winding temperature on PD behavior remains insufficiently understood (“Impact of Temperature on Partial Discharge in Generator Stator Windings”, 2026); (4) Online infrared inspection has become a powerful approach for identifying faulted composite insulators; however, the mechanisms responsible for their abnormal heating and temperature distribution remain unclear (“Research on the Mechanisms of Abnormal Heating and Temperature Rise…”, 2026); (5) A comprehensive understanding of the key factors and critical conditions governing its occurrence is lacking, which hinders accurate condition assessment and increases failure risk (“The Synergistic Electro-Thermal-Electrochemical Mechanism of Water-blocking…”, 2026). 131 gap statements have been mined from High voltage insulation and dielectric phenomena papers in our 4.5M-paper local library, which holds 1,595 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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