A5090382848- High voltage insulation and dielectric phenomena
- Dielectric materials and actuators
- Power Transformer Diagnostics and Insulation
- Advanced Sensor and Energy Harvesting Materials
- Lightning and Electromagnetic Phenomena
- Electrical Fault Detection and Protection
- Electrostatic Discharge in Electronics
- Thermal Analysis in Power Transmission
- Semiconductor materials and devices
- Conducting polymers and applications
- IoT and Edge/Fog Computing
- Thermal properties of materials
- Surface Modification and Superhydrophobicity
- Aerosol Filtration and Electrostatic Precipitation
- Icing and De-icing Technologies
- Carbon Nanotubes in Composites
- Tribology and Wear Analysis
- Advanced Memory and Neural Computing
- Water Quality Monitoring Technologies
- Energy Load and Power Forecasting
- Energy Efficient Wireless Sensor Networks
- Synthesis and properties of polymers
- Energy Harvesting in Wireless Networks
- Solar Radiation and Photovoltaics
- Smart Materials for Construction
Qingdao University of Science and Technology
2025
China Southern Power Grid (China)
2020-2024
Yunnan Machinery Research and Design Institute
2023
Electric Power Research Institute
2021
Xi'an Jiaotong University
2015-2020
Kunming University
2020
State Key Laboratory of Electrical Insulation and Power Equipment
2018
Abstract Triboelectric–electromagnetic hybridized nanogenerator (TEHG) is confirmed as an effective energy harvesting for Internet of Things. However, it still a great challenge to gain high‐output triboelectric‐nanogenerator (TENG) and perfectly combine TENG with electromagnetic generator (EMG). Herein, TEHG composed space confined multi‐layer‐stack (SM‐TENG) stack compression promoted flux change EMG proposed. The interaction magnets on the rotor stator makes contact–separation SM‐TENG...
The emerging applications of organic field-effect transistors (OFETs), such as photon memories and artificial synapses, require polymer dielectrics with superior charge trapping properties. Despite the introduction high-k fluorinated polymers in performance optimization OFETs, there is still a lack widely recognized acknowledgment between molecular structures characteristics, well no general principles designing polymeric for electronic memory devices. Here, we propose series polystyrene...
Two kinds of insulation systems with nanocomposite have been fabricated by co-pressing low-density polyethylene (LDPE) and nano-titania doped LDPE (TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -LDPE) films. The three-layer considered are TiO -LDPE/LDPE/TiO -LDPE (namely, NLN) LDPE/TiO -LDPE/LDPE LNL). Space charge distributions under different applied electric fields were measured the pulsed electro acoustic (PEA) method....
Poly(4-fluorostyrene) with strong charge storage capability is introduced as an electret in a field-effect transistor to improve device performance and memory stability.
In recent years, electrochromic materials have been extensively utilized in smart windows, displays, and dimmable devices. WO<sub>3</sub>, as a typical material has received significant attention. Existing researches indicate that the concentration distribution of oxygen vacancies WO<sub>3</sub> are both important determining effect. However, it reported traditional preparation methods such annealing can significantly reduce ability to modulate crystallinity optical...
Mixed-frequency electric stress and the thermal issue by rapid semiconductor switching circuit topology cause unexpected insulation breakdown, indicating a key on medium-high frequency (MF-HF) transformers. This work focuses effects of temperature breakdown strength used epoxy resin insulation. An experimental method containing power supply measurement unit was constructed under high sinusoidal voltages with harmonic components. A continuous boost to induce dielectric breakdown. Meanwhile,...
The performance parameters and service life of the insulation layer high-voltage cables are key to ensure safe cable operation. Through extracting mechanical high voltage under different thermal aging temperatures, a normal linear regression model is established predict cables. Meanwhile, physicochemical characteristics such as microscopic morphology molecular structure changes analyzed, dielectric properties breakdown field strength ac condition tested macroscopic electrical studied,...
Since surface flashover of insulators in vacuum restricts the operation power equipment, improvement performance is considerable importance various fields. Previous studies show that closely related to trap parameters materials. In this paper, crystallization behavior low density polyethylene (LDPE) modified by phenolphthalein. It results change parameters, leading enhancements performance. Results differential scanning calorimeter (DSC) and electron microscope (SEM) LDPE greatly changed The...
The Maximum Power Point Tracking method is a mainstream for improving the operational efficiency of photovoltaic power generation, but it difficult to adapt rapidly changing environment and lacks good steady-state dynamic performance. To achieve fast accurate tracking Tracking, optimization contraction expansion coefficient Quantum Particle Swarm Optimization algorithm studied, then Levy flight strategy introduced optimize algorithm’s global convergence ability, thereby constructing Hybrid...
Abstract The ice covering of transmission lines tends to cause flashover along the surface, and even topple tower in serious cases, which seriously threatens safe operation power grid. Here, a dual active passive anti-icing strategy was designed. deicing achieved by photothermal effect, based on superhydrophobicity. On one hand, semi-embedded candle ash gives surface excellent characteristics, can quickly melt through sunlight; other superhydrophobic coating demonstrates performance, reduces...
Precisely determining how cables distribute their current-carrying capacity and temperature field is crucial for the dependable cost-effective functioning of power grids. Firstly, cable structure advantages disadvantages different laying methods are analyzed in detail. Secondly, theoretical model calculation cables, including heat convection, conduction, radiation, constructed, method calculating capacity, relying on double-point chordal interception method, suggested. Then, COMSOL...
In engineering applications, the material properties of cable accessories are affected by electrical, thermal, and mechanical stress. this work, comprehensive insulation semi-conductive for accessory studied. Furthermore, multiphysics field coupling simulation model is established to study distribution variation in electric, stress fields. The experimental results show that relative permittivity silicone rubber (SiR) cross-linked polyethylene (XLPE) gradually decreases with increasing...
Interface between the metal electrode and insulating material affects dielectric performance of whole system significantly. In this study, low density polyethylene (LDPE) films were treated in ozone atmosphere for different time duration to investigate effect interface state on breakdown performance. Fourier transform infrared spectra (FT-IR) results show that carbonyl group (C=O) is introduced into surface LDPE film after treatment, amount C=O groups increases when oxidation extends....
Surface flashover is the primary limitation to development of power system and increase voltage level. Previous work has proved that trap can greatly influence performances, but relationship between parameters surface not clear. In paper, we study effects crystallization behavior, microstructure, on DC performance semi-crystallinity polymer through adding phenolphthalein which regarded as nucleating agent in low density polyethylene (LDPE). Micro-IR spectroscopy result proves exactly exists...
In recent years, under the development of dual carbon goal, energy crisis has become increasingly serious, and China also experienced serious power rationing. However, research on dynamic surface control technology in solar tracking systems nonlinear is mostly based continuous-time systems, while adaptive discrete-time can describe an actual system more accurately production process. It effectively suppress interference with extremely high stability safety. To solve problem low efficiency...
The effect of plasma surface treatment epoxy resin (EP) AI <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> micro-composite for different times (1min, 3min and 5min) on vacuum flashover performance had been researched in this study. Three critical factors flashover, such as chemical composition, trap parameters conductivity, evaluated through X-ray photoelectron spectroscopy (XPS),...
Application of functionally graded materials (dielectric with spatial variated permittivity or conductivity distribution) is a promising approach for the electric field optimization in cable accessories. In this paper, we uses multi-layer to design and distribution joint insulation, which are intended be applied AC DC applications, respectively. The results shows that intensification phenomena were inhibited after process. Moreover, degree E-field affected by permittivity/conductivity range,...
Functionally graded materials (FGMs) used in electrical insulation have spatially inhomogeneous dielectric properties (i.e., permittivity or conductivity), which can be applied to relieve localized electric field (E-field) intensification and improve performance. However, previous research shows some limitations inadequate considerations on the material feasibility, insufficient universality grading type voltage form. In this study, a study of silicone rubber (SiR) nanocomposites containing...
Power equipment operates under high voltages, inducing space charge accumulation on the surface of key insulating structures, which increases risk discharge/breakdown and possibility maintenance workers experiencing electric shock accidents. Hence, a visualized non-equipment detection method is great demand in power industry. Typical electrochromic phenomenon based redox material, triggered by voltage smaller than 5 V with continuous current μA~mA level, not applicable to fields above 106...