A5104471577- High voltage insulation and dielectric phenomena
- HVDC Systems and Fault Protection
- High-Voltage Power Transmission Systems
- Vacuum and Plasma Arcs
- Ultrasonics and Acoustic Wave Propagation
- Structural Health Monitoring Techniques
- Electrical Fault Detection and Protection
- Non-Destructive Testing Techniques
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Chinese history and philosophy
- Thermal Analysis in Power Transmission
- Power Transformer Diagnostics and Insulation
- Microwave Engineering and Waveguides
- Geophysical Methods and Applications
- Structural Response to Dynamic Loads
- Power Systems Fault Detection
- 3D Printing in Biomedical Research
- Quality and Safety in Healthcare
- Engineering Education and Pedagogy
- Wireless Sensor Networks and IoT
- RFID technology advancements
- Power Line Inspection Robots
- Energy, Environment, and Transportation Policies
- Economic Zones and Regional Development
China Southern Power Grid (China)
2019-2025
George Washington University
2025
Chongqing Medical University
2024
Chongqing Public Health Medical Center
2024
Qingdao University
2024
Shanghai Jiao Tong University
2014
Clemson University
2008
Chongqing University
2006
ON Semiconductor (United States)
2006
Inner Mongolia University
2006
A broadband dual circularly polarized patch antenna with wide beamwidth is presented. The excited by four cross slots via a microstrip line multiple matching segments underneath the ground plane. and are optimized simultaneously to obtain best performance. Measurements show that has 10-dB return-loss bandwidth of 24%, isolation 19%, 3-dB axial-ratio 16%, 110 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> . Moreover, single feed makes it...
Carbon price forecasting and pricing are critical for stabilizing carbon markets, mitigating investment risks, fostering economic development. This paper presents an advanced decomposition-integration framework which seamlessly integrates econometric models with machine learning techniques to enhance forecasting. First, the complete ensemble empirical mode decomposition adaptive noise (CEEMDAN) method is employed decompose data into distinct modal components, each defined by specific...
Circuit breakers are effectively utilized for the controlled switching technique to mitigate inrush current when energizing an unloaded transformer. The core of is obtain appropriate closing angle based on residual flux after opening. For prediction flux, voltage integration method faces difficult problem determining upper limit, while Jiles- Atherton (J-A) model has advantages clear physical meaning parameters, accurate calculation, and ability iteratively solve magnetism. It low dependence...
This study aims to achieve intelligent decision making in HVDC systems the framework of knowledge graphs (KGs). First, whole life cycle KG an system was established by combining making. Then, fault diagnosis studied as a typical case study, and decision-making method for based on XGBoost that significantly improved speed, accuracy, robustness designed. It is noteworthy dataset used this extracted KGs, accordingly combined. Four kinds data from KGs were firstly preprocessed, their features...
To overcome the incomplete decomposition of vibration signals in traditional motor-bearing fault diagnosis algorithms and improve ability to characterize characteristics anti-interference, a diagnostic strategy combining dual signal reconstruction deep learning architecture is proposed. In this study, an improved complete ensemble empirical mode with adaptive noise (CEEMDAN) variational (VMD)-based method first introduced extract features representing motor bearing faults. A feature matrix...
Estimating the severity of partial discharge is a critical step in diagnosing faults power equipment. The pulse current method using apparent quantity to describe level widely used. However, this method's detection frequency range coincides with strong electromagnetic interference field and relies on offline test circuits, making it difficult achieve online monitoring electrical Therefore, paper proposes inverse calculation based digital simulation ultra-high (UHF) signal. Through modeling...
The double-fracture disconnect switch(DDS) is a solution to continue operating without shutting down during GIS extension and withstand tests, which designed as an nonstandard structure. In order verify that the DDS satisfies actual conditions. this paper, 3D simulation models of for mechanical, electrical, thermal field are established by ANSYS. calculation mechanical strength, insulation strength current-carrying capability carried out. addition, test, temperature-rise dynamical stability...
A broadband spider-shaped monopole antenna is designed for ultra-high frequency (UHF)-band airborne applications. The consists of a dielectric sleeve, bulb-like metal body, and eight arc pipes. Good agreement between the simulated measured results are observed, where proposed achieves wide impedance bandwidth 52.7% VSWR ≤ 2, covering range from 624 MHz to 1.07 GHz, with stable maximum gain azimuthal over 5 1.5 dBi, respectively, in entire bandwidth.
As one of the most important component in mechanical and hybrid dc breaker (MCB HCB), operating time ultrafast vacuum switch (VS) determines breaking speed MCB HCB. However, limited by high capacitive storage energy requirement Thomason-coil actuator (TCA), low-efficiency large-volume mechanism are main restrictions for wide application VS. This article proposes a high-efficient miniaturized method VS recycling residual capacitor banks sequential open- close-operations (O-C). Mathematical...
This paper addresses the development of high voltage direct current High-Speed Switch (HSS) for multi-terminal DC transmission systems. The performance HSS significantly affects power capability and operational flexibility these To enhance ±800 kV products, this discusses key technologies related to insulation, no-load charging breaking, arc withstand. presents latest research results using simulation experimental methods. findings contribute improving continuity safe stable operation
High-Speed DC Switches (HSS) are critical equipment in multi-terminal transmission systems, with their ability to withstand arc ablation for extended periods being crucial. This paper presents an experimental study of HSS characteristics ±800 kV hybrid HVDC projects. We constructed a constant current high-current test circuit switching power supplies and conducted long-term tests arcs under operating conditions product HSS. Additionally, we performed endurance on 500 switch sample. The...
If metal particles move to the surface of spacer in a DC Gas Insulated Line, they will distort original electric field, increasing instability GIL during long-term operation. By setting up particle traps front and on inner casing, low field strength area can be formed suppress movement. However, there is currently no clear method for analyzing trap efficiency. Based ±320 kV physical platform, research indicates that total number trapped negatively correlated with initial distance from (5cm,...
On-load tap-changer of converter transformer is not only the core component to realize voltage regulation transformer, but also key that has been localized. It plays an important role in ensuring stability power system. With development flexible DC transmission technology, on-load switching load current with harmonic becoming more and prominent. The operation often carried out under complex working condition multiple superposition. Therefore, will have a large slope, which significantly...
A CMOS long-term evolution (LTE) direct convert receiver that eliminates the interstage SAW filter is presented. The consists of a low noise variable gain transconductance amplifier (TCA), quadrature passive current commutating mixer with 25% duty-cycle LO, trans-impedance (TIA), 7th-order Chebyshev and programmable amplifiers (PGAs). wide dynamic range allocated in RF analog parts. LO improves gain, noise, linearity. An LPF based on Tow-Thomas biquad suppresses out-of-band interference....
The residual stress could be produced during the curing process of GIS basin insulators. coupling and external may cause concentration, which threaten safe operation In this paper, method for detecting a 252kV insulator by critical refraction longitudinal wave (LCR) is presented. detection system built. main frequency excitation receiving probe 2 MHz. ultrasonic velocity epoxy resin standard sample measured. Two checkpoints on are selected circumferential with distance 5 mm. results show...
The development of defects in basin insulators inside a GIS (gas-insulated metal-enclosed switchgear) could trigger partial discharges under long-term working voltage, threatening safe operation. In this paper, the ultrasonic pulse-echo method was proposed to detect large-scale insulators. And an system set up, including generator, transducer and so on. Among them, generator has been improved obtain original waveform. Then tests were carried out on thickness insulators, type appropriate...
Abstract To assess the performance of bushings in UHV converter transformers, a finite element time analysis was performed on ±800 kV transformer with or without implementation horizontal seismic isolation devices. The simulation results show that maximum stress response value root alternating current bushing is 68.96 MPa, when device not installed, and values two direct are close, 26.06 MPa 25.89 respectively; vertically arranged, angle between axis X-direction smaller, relative...