A5064398747- High voltage insulation and dielectric phenomena
- Dielectric materials and actuators
- Power Transformer Diagnostics and Insulation
- Thermal Analysis in Power Transmission
- Advanced Sensor and Energy Harvesting Materials
- 2D Materials and Applications
- Aerosol Filtration and Electrostatic Precipitation
- Plasma Diagnostics and Applications
- Silicone and Siloxane Chemistry
- Electrostatic Discharge in Electronics
- Synthesis and properties of polymers
- MXene and MAX Phase Materials
- Semiconductor materials and devices
- Advanced Fiber Optic Sensors
- Epoxy Resin Curing Processes
- Graphene research and applications
- Topological Materials and Phenomena
- Gas Dynamics and Kinetic Theory
- Polymer composites and self-healing
- Power Systems and Technologies
- Multiferroics and related materials
- Electrical Fault Detection and Protection
- Polymer Nanocomposite Synthesis and Irradiation
- Mechanical Engineering Research and Applications
- Industrial Technology and Control Systems
Xi'an University of Technology
2021-2024
China Academy of Space Technology
2023
Northwestern Polytechnical University
2020-2022
Jinhua Academy of Agricultural Sciences
2022
Ministry of Industry and Information Technology
2020-2022
North China Electric Power University
2016-2021
With this expected future advance of HVDC, the use gas insulated transmission lines (GIL) for dc application are getting increasingly interesting. For now, problem surface charge accumulation on gas-insulator interface is one critical factors development DC-GIL. In many previous works, model insulator was investigated. However, quantitative relationship between temperature and not exactly obtained since lack complicated heat transfer progress in model. paper, operating DC-GIL developed,...
Polydimethylsiloxane (PDMS) elastomers with high mechanical and healing properties are developed as smart materials for electrical power systems electronic devices to address or damage. However, the challenge is reconcile conflicting molecular mechanisms of in development PDMS elastomers. This study adopts "rigid-while-flexible" mutual network structure by copolymerizing rigid polyimide (PI) flexible segments dynamic reversible crosslinking designed on backbones. elastomer (designated PSiPI)...
The hetero-polar charges on the spacer surface due to gas ionization has been verified as one of hazard charge sources threatening safe operation HVDC gas-insulated transmission line (GIL). This letter reports differences in charging properties spacers SF6 and C3F7CN/CO2 mixtures, a rigorous re-examination environmental firendly assessment for DC GIL is introduced. results show that when maximum value electrical field strength at 0.45 kV mm−1, homo-polar potential different insulating gases...
Voltage polarity reversal is a special condition in HVDC transmission system. In this study, low density polyethylene (LDPE) and nano-CB/LDPE composites films were manufactured, the space charge distribution was measured under DC voltage with without respectively by pulsed electro-acoustic (PEA) method to reveal doping effect of nano-CB on distribution. According experimental results LDPE, before reversal, homo-charges are injected accumulate around electrodes, these charges cannot dissipate...
This paper studies temperature rise characteristics of 110 kV XLPE cable under different service years. When the load is 900 A, maximum 0, 15 and 30 years 335.5 K, 372.96 K 393.88 respectively. Compared with data obtained from non-aged cable, increase for samples operating 111.15% 117.4% higher. For these samples, proportion heating due to dielectric loss 2.77%, 25.45% 34.78%. The research content this provides a basis on optimal current carrying capacity cables years, reference actual...
Abstract Smart sensors with excellent performance are accelerating the development of biomedicine and Internet Energy. Nanodielectrics exhibit unique electrical mechanical properties. As predominant materials in optical magnetic field sensor (MFS), they can not only exert anti‐interference sensing, but improve measuring characteristics sensors. For instance, fibre quantum probe for obtain a higher sensitivity 0.57 nT/Hz 1/2 , while measurement range that uses Co‐doped ZnO nanorods as...
Electric field distortion caused by the space charge accumulation in insulation is considered to be one of obstacles for operation high voltage DC cables. In this paper, nano-CB/LDPE composites were fabricated using melt blending method. Space characteristics and distortions nanocomposite films measured under direct current (DC) pulsed electro-acoustic (PEA) Dielectric properties breakdown strength also investigated. Experimental results indicate that, adding appropriate doping content CB...
Layered black phosphorus (BP), as a well-known type of two-dimensional (2D) material, has exhibited many fascinating properties in the fields electronics, photonics, and chemical applications. However, instability 2D is primary obstruction toward practical applications, one-dimensional (1D) remain unexplored. Here, we have first successfully synthesized 1D single crystalline BP nanowires, which represent characteristics good stability, narrow width (∼100 nm), wafer-scale arrays, high surface...
Ultrathin hybrid perovskites, with exotic properties and two-dimensional geometry, exhibit great potential in nanoscale optical optoelectronic devices. However, it is still challenging for them to be compatible high-resolution patterning technology toward miniaturization integration applications, as they can readily damaged by the organic solvents used standard lithography processes. Here, a flexible three-step method developed make multicolor on perovskite, particularly achieved single...
Insulation material is a key component of electrical equipment in satellites; its properties determine the reliability and lifetime whole satellite. High-energy radioactive rays space affect molecular structure polymeric insulating materials. Under action plasma, high energy particles, along with magnetic fields experienced orbits, electric charges get injected into trapped by creating distortions field even electrostatic discharges. Polyimides have been widely used for insulation...
In this paper, the space charge behavior of polyimide at cryogenic temperatures is studied. The pulsed electro-acoustic (PEA) and thermally stimulated current (TSC) methods are exploited to evaluate distribution, quantification accumulation trap characteristics polyimide. results show that change 273 123 K divided into three temperature regimes. At 273-223 K, decreases significantly with decreasing temperature, which mainly due suppression generation migration. 223-173 negative gradually...
The spacecraft often interacts with plasma, high energy particles and magnetic fields on orbit. It causes the charge injected in insulation materials forms a electric field. discharge phenomenon will happen when internal field reaches voltage threshold. material is key component of electrical equipment spacecraft, its properties affects reliability lifetime whole spacecraft. withstands fast thermal cycle during operation orbit, which stress it. accumulation changes molecular structure...
Abstract Flexible solar wings with high energy density, lightweight, small size and large deployment area are one of the first choices for next‐generation spacecraft. However, flexible subjected to irradiation in space tensile mechanical stress, which produce charge accumulation effect result electrostatic discharge. It is necessary establish a test method conductivity behaviour polyimide under stress. The stress–strain characteristics different stresses studied by authors. longitudinal...
We succeeded in putting forward a two-dimensional electric transport model based on the first-order kinetic charge trapping/detrapping model. The dynamic conductivity under thermal cycle of polyimide is analyzed from numerical calculations and experimental tests. characteristics polymer dielectric temperature cycling was found to be dominated by time, because filled traps rapid changes temperature. present study contributes providing an accurate calculation for dielectrics temperature-varying fields.
Abstract Magneto‐optical effect has been widely used in light modulation, optical sensing, and information storage. Recently discovered 2D van der Waals layered magnets are considered as promising platforms for investigating novel magneto‐optical phenomena devices, due to the long‐range magnetic ordering down atomically thin thickness, rich species, tunable properties. However, majority antiferromagnets suffer from low luminescence efficiency which hinders their investigations applications....
In view of the cumbersome and inaccurate process caused by manual feature extraction in power quality disturbance classification, according to characteristics classification time sequence. This article presents a method analysis identification based on LSTM. Firstly, random single electric energy signal is spliced into large form continuous Secondly, existing neural network, an LSTM model suitable for PQD constructed, then signals are used as input train optimize model. The will classify...
Traditionally, conductivity, a key parameter for evaluating the probability of electrostatic discharge, has been subscribed to belief that it is constant value. However, in actual working conditions, such as low earth orbit environment, conductivity value dielectrics not due variation temperature. Therefore, great practical significance investigate time-varying field and explore hidden mechanism charging phenomenon. In this paper, we investigated dynamic using polyimide during four...
Due to its excellent insulation and mechanical properties, cross-linked polyethylene (XLPE) is widely used as the candidate of power cables in transmission distribution systems.However, performance can be affected due various stresses, which endangers safe operation system service.In this paper, dielectric properties XLPE materials 110 kV with service lives 0, 15, 30 years were tested evaluated.Results show that increase life, loss caused by polarization process increases significantly,...
Crosslinked polyethylene (XLPE) insulation is widely used in power systems because of its excellent properties. During long-term operation, the aging insulating materials will lead to cable failure and threaten safe operation system. The molecular structure evolution XLPE was studied by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC) thermogravimetric (TG) methods. results show that crystallinity melting temperature 0 year...