A5037003531- High voltage insulation and dielectric phenomena
- Power Transformer Diagnostics and Insulation
- Electrical Fault Detection and Protection
- Lightning and Electromagnetic Phenomena
- Electrostatic Discharge in Electronics
- Thermal Analysis in Power Transmission
- Dielectric materials and actuators
- Aerosol Filtration and Electrostatic Precipitation
- Iterative Learning Control Systems
- Advanced Sensor and Energy Harvesting Materials
- Robotic Mechanisms and Dynamics
- Advanced Numerical Analysis Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Fiber Optic Sensors
- Advanced Surface Polishing Techniques
- Non-Destructive Testing Techniques
- Structural Health Monitoring Techniques
- Polymer Nanocomposites and Properties
- Advanced Sensor and Control Systems
- Industrial Vision Systems and Defect Detection
- Advanced machining processes and optimization
- Power Systems Fault Detection
- Power Systems and Renewable Energy
- Ultrasonics and Acoustic Wave Propagation
- High-Voltage Power Transmission Systems
Sichuan University
2016-2025
Zhejiang Chinese Medical University
2025
Lanzhou Institute of Chemical Physics
2024
Lanzhou University of Technology
2024
Zunyi Medical University
2023-2024
Tsinghua University
2005-2024
State Grid Corporation of China (China)
2018-2024
Mianyang Central Hospital
2024
University of Electronic Science and Technology of China
2024
Southeast University
2024
Early and accurate detection of incipient cable faults is a great interest to the utility industry. Such can be classified into subcycle multicycle types. Although lot research has been conducted on types faults, little work done for faults. This paper proposes novel method detecting locating fault in cable. The modeled as self-clearing arcing fault. distortion degree calculated voltage used detect occurrence an match between measured waveforms guide search distance. accuracy further...
As a core component of AC drive electric locomotive, performance inverter-fed motor directly influences the stability and reliability locomotive running. However, insulation early failures occur frequently. Presently, polyimide film, as special type engineering plastic widely applied in turn to ground motors is kind basic insulating material. This paper investigates charge transport mechanism space characteristics films based on measuring comparing accumulation threshold field between...
A novel tunable frequency selective surface (FSS) with dual-degrees of freedom (DOF) is presented, and firstly applied to broadband absorber. Based on a simple prototype unit cell resonator, an approach for achieving multi-resonances studied. pattern gradient edges discussed, variable resistor capacitor are introduced fully utilize its characteristic multi-resonances. Bias line designed provide bias voltage respectively two devices operational DOF FSS. Simulation measurement results both...
In this paper, the conversion of electrical tree to water is found in a cross-linked polyethylene (XLPE) cable, and possible mechanism presented. An electrical-tree initiation experiment was performed under AC voltages XLPE cable specimens. After that, 390-hour accelerated water-tree aging for specimens, trees at tips were observed slices by an optical microscope. Also, further understand confirm conversion, similar experiments performed, same phenomenon block Depending on geometric size...
When the trajectory with high speed and acceleration contains frequency contents matching structure mode, inertial vibration of is easily excited, reducing machining accuracy surface finish. Input shaping can avoid vibration, but it introduces time-delay that causes multiaxis distortion affects contour error estimation. This article presents time parameter mapping precompensation for input to suppress vibration. The domain trajectories established by deducing relation between local curvature...
This paper proposes a cable defect location method based on the power spectral density (PSD) to improve accuracy of existing frequency domain reflection (FDR) method. The principle proposed is that empirical mode decomposition (EMD) used decompose envelope coefficient into intrinsic function (IMF) each insulation point and real part IMF signal windowed. Then, according characteristics random with definite auto-correlation function, PSD analysis performed limited power. In theory, spectrum...
A frequency domain reflection (FDR) method has been widely used to locate cable defects. Generally, the performance of FDR can be enhanced by extending sweeping range signal. However, with increase in signal frequency, misdiagnosis easily occur owing attenuation and noise. Thus, this paper's authors propose upper (UF) selection improve accuracy defect location. First, cable's three-dimensional location spectrum, including spatial information, is obtained at a wide based on short-time Fourier...
Addressing the demand for integrating strength and durability reinforcement in shape memory polyurethane (SMPU) diverse applications remains a significant challenge. Here series of SMPUs with ultra-high strength, self-healing recyclability, excellent properties through introducing dynamic boron-urethane bonds are synthesized. The boric acid (BA) to leading formation covalent (DCB) boron-urethane, that confer robust cross-linking structure on led ordered stable hydrogen-bonding network within...
The insulation reliability of flexible cable terminals is largly determined by its interface pressure. A timely and accurate measurement the pressure hence great importance for grasping status terminal. Presently terminal generally measured built-in sensor method, which however, requires sensors to be installed in advance. This will distort electric field distribution even induce discharges. Therefore, exploring an effective non-destructive method on-site has engineering significance. paper...
ABSTRACT Introduction The interplay between emotional disorders and thyroid has been subject to numerous observational studies, which have consistently reported associations but failed establish clear causal links due the multifactorial etiology influences. We conducted a bidirectional two‐sample Mendelian randomization (MR) analysis explore genetic association disorders. Methods employed several methods, including inverse‐variance weighted (IVW), median, mode, MR Egger regression....
The polarization and depolarization current (PDC) measurement has been widely used to assess the aging degree of cross-linked polyethylene (XLPE) cables. However, type identification XLPE cables not fully considered. In this study we conduct PDC on thermal-aged water tree-aged cable samples respectively, upon which a graphical approach insulation condition distinguish is proposed. First, designate evaluation indexes condition, multiple based dielectric parameters are Then, reflect...
The partial discharge (PD) classification for electric power equipment based on machine learning algorithms often leads to insufficient generalization ability and low recognition accuracy. To solve the problem, this article develops an improved Wasserstein generative adversarial network with gradient penalty (WGAN-GP) data augmentation model. WGAN-GP model can generate samples supplement low-data input set in PD source classification. First, conditional generation is trained various new are...
Due to the spurious peaks caused by multi-reflection and randomness of cable transfer function, frequency domain reflection (FDR) method based on Fourier transform (FT) is inaccurate, even resulting in misjudging soft faults cable. Thus, this paper, a sweep location multiple signal classification (MUSIC) pseudospectrum proposed accurately diagnose locate faults. The idea extend function into an array estimate MUSIC-pseudospectrum which can analysis uncertain signals deterministic functions....
Inverter-fed motors are damaged due to pulse voltage. The situation leads early failure of insulation. Polyimide is an important insulating material in the inverter-fed motors. Its insulation aging process and mechanism different from traditional ac dc In this paper, structure change polyimide film under voltage above partial discharge inception (PDIV) investigated through scanning electron microscopy (SEM), thermally stimulated current (TSC) lifetime test. It reveals that degradation...
Measurements of space charge density and trap levels are informative ways to predict failure conditions insulation materials. The charges injected from electrodes penetrate surface towards deep inside the material. In order resist injection, trapping, migration increase recombination, detrapping extraction rate, layer (nanocomposite-PI-nanocomposite) sandwich structure samples used. Two techniques Pulse Electro Acoustic (PEA) Thermal Stimulated Current (TSC) combined characterize behavior...
The partial discharge (PD) in inverter-fed motors generated from high frequency and short rise time impulsive voltage are more complex than traditional sinusoidal operated due to the noise initiated fast switching power electronics devices. Available PD sensors related technology for DC cannot be used at repetitive conditions. This work aims report design of antenna with optimized geometry satisfied parameters detect voltage. is verified influence both impulse test configuration on features...