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学者姓名：耿英三
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Abstract ：
In this article, piezoelectric ceramic is a core device of an ultrasonic wireless power transmission (UWPT) system. The most commonly used piezoelectric ceramic in research and applications of UWPT has a ring-like shape. The piezoelectric ceramic rings usually work in the presence of significant radial and axial vibrations as long as they are not extremely thin. However, in most studies related to the UWPT, only the axial vibration mode is considered. The Mason equivalent circuit model of axial vibration is widely used and the effect of radial vibration on the whole system is ignored. In this article, first, a method to analyze the piezoelectric ceramic ring considering the radial-axial coupled vibration is proposed. Second, the analytical expressions of the constitutive equations of the piezoelectric ceramic ring are derived. Third, a new form of analytical equations is constructed, and a novel two-dimensional equivalent circuit of the UWPT system considering the radial-axial coupled vibration of the piezoelectric ceramic ring is proposed. Fourth, the input and output characteristics of the proposed model and the conventional Mason equivalent circuit model are simulated using MATLAB. Last, the simulation results are compared and verified by experiments. The results demonstrate that the proposed model can describe the system resonance more accurately and comprehensively than the conventional Mason model. As a whole, this study increases the accuracy of the equivalent circuit model of the UWPT system and has important theoretical significance for UWPT research.
Keyword ：
Acoustics Ceramics Equivalent circuit model Equivalent circuits Integrated circuit modeling Mathematical models piezoelectric ceramic ring radial-axial coupled vibration Surface impedance ultrasonic Vibrations wireless power transmission (WPT)
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| GB/T 7714 | Du, Yuwei , Zhao, Yufei , Wang, Zhenxing et al. Two-Dimensional Equivalent Circuit Model of Ultrasonic Wireless Power Transmission [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2023 , 70 (1) : 975-984 . |
| MLA | Du, Yuwei et al. "Two-Dimensional Equivalent Circuit Model of Ultrasonic Wireless Power Transmission" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 70 . 1 (2023) : 975-984 . |
| APA | Du, Yuwei , Zhao, Yufei , Wang, Zhenxing , Wang, Heyang , Wang, Jianhua , Geng, Yingsan et al. Two-Dimensional Equivalent Circuit Model of Ultrasonic Wireless Power Transmission . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2023 , 70 (1) , 975-984 . |
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Abstract ：
Convolutional neural networks (CNNs) have promoted the development of insulation defect diagnosis for gas-insulated switchgear (GIS) because of their excellent feature extraction and classification capabilities. However, CNN ignores the correlation between the local areas of the feature space, resulting in insufficient feature utilization. Moreover, deploying and applying the methods explored in massive laboratory data to complex and few-shot conditions on-site is a difficult problem currently. Therefore, this study proposes a novel domain adaptation graph convolutional network (DAGCN) for GIS insulation defect diagnosis. First, the graph signal and graph convolution network are used to take advantage of the correlation between the local areas of the feature space while employing the numerical characteristics of the insulation defect signal. Then, the learned diagnostic method is deployed to the on-site GIS insulation defect diagnosis with domain adaptive transfer learning (TL). The difference between the two tasks is reduced by minimizing the difference between the marginal and conditional distributions of the source and target domains, thus, realizing the feature migration. The experimental verification shows that DAGCN has higher diagnostic accuracy and robustness than traditional methods, especially in diagnosing few-shot on-site. It provides a reliable reference for high-precision and robust diagnosis of few-shot GIS insulation defect diagnosis.
Keyword ：
Convolution Correlation Domain adaptive transfer learning (DATL) Feature extraction few-shot gas-insulated switchgear (GIS) Gas insulation graph convolutional network (GCN) Insulation insulation defect diagnosis Partial discharges Task analysis
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| GB/T 7714 | Wang, Yanxin , Yan, Jing , Yang, Zhou et al. Gas-Insulated Switchgear Insulation Defect Diagnosis via a Novel Domain Adaptive Graph Convolutional Network [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2022 , 71 . |
| MLA | Wang, Yanxin et al. "Gas-Insulated Switchgear Insulation Defect Diagnosis via a Novel Domain Adaptive Graph Convolutional Network" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 71 (2022) . |
| APA | Wang, Yanxin , Yan, Jing , Yang, Zhou , Qi, Zhenkang , Wang, Jianhua , Geng, Yingsan . Gas-Insulated Switchgear Insulation Defect Diagnosis via a Novel Domain Adaptive Graph Convolutional Network . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2022 , 71 . |
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Abstract ：
Data-driven artificial intelligence methods, especially convolutional neural networks (CNNs), have achieved excellent performance in high-voltage circuit breaker (HVCB) fault diagnosis. However, CNN relies heavily on massive data. When the amount of data decreases, the fault diagnosis performance drops severely. To settle these problems, a few-shot transfer learning (FSTL) with attention mechanism (AM) to realize the mechanical fault diagnosis of HVCBs is proposed. First, a one-dimensional CNN with AM is used to extract the fault features of HVCBs. The introduction of the AM makes CNN pay more attention to the interesting part of the fault signal to extract discriminative features. Then, domain adaptive transfer learning is used to realize a reliable diagnosis of HVCBs in small samples.The subdomain adaptation is adopted to adjust the distribution of related subdomains under the same category. The proposed subdomain adaptation can not only align the global distribution well but also effectively align the distribution of the same category of subdomains. Experimental results show that the FSTL proposed can achieve highly accurate and robust fault diagnosis of HVCBs with few-shot on-site. Compared with the traditional methods, the FSTL is obvious and provides a reliable reference for the diagnosis of HVCBs.
Keyword ：
Circuit breakers Circuit faults Convolutional neural networks Domain adaptive transfer learning (DATL) fault diagnosis Fault diagnosis Feature extraction few shot high-voltage circuit breakers (HVCB) Kernel one-dimensional convolutional neural network (1DCNN) Transfer learning
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| GB/T 7714 | Wang, Yanxin , Yan, Jing , Ye, Xinyu et al. Few-Shot Transfer Learning With Attention Mechanism for High-Voltage Circuit Breaker Fault Diagnosis [J]. | IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS , 2022 , 58 (3) : 3353-3360 . |
| MLA | Wang, Yanxin et al. "Few-Shot Transfer Learning With Attention Mechanism for High-Voltage Circuit Breaker Fault Diagnosis" . | IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 58 . 3 (2022) : 3353-3360 . |
| APA | Wang, Yanxin , Yan, Jing , Ye, Xinyu , Jing, Qianzhen , Wang, Jianhua , Geng, Yingsan . Few-Shot Transfer Learning With Attention Mechanism for High-Voltage Circuit Breaker Fault Diagnosis . | IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS , 2022 , 58 (3) , 3353-3360 . |
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Abstract ：
With the rapid development of DC power systems and the increasing demand for DC circuit breakers, electromagnetic repulsive drives-based Thomson coil actuators (TCA) are widely investigated to provide the high-speed actuating required for ultra-fast mechanical switches, especially those used in hybrid DC circuit breakers. The actuating mechanism is required to be fast, reliable, and economic. This article summarizes the development of Thomson coil actuators in circuit breakers in recent years, further illustrating the basic principles and the actuator topology. In addition, it discusses the various structural components of TCA and describes the utilized modeling and simulation methods. The main objective was to provide a comprehensive overview of the TCA field.
Keyword ：
circuit breaker electromagnetic repulsive drive mechanical switch operation mechanism Thomson coil actuator
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| GB/T 7714 | Al-Dweikat, Mohmmad , Cui, Jian , Sun, Shuai et al. A Review on Thomson Coil Actuators in Fast Mechanical Switching [J]. | ACTUATORS , 2022 , 11 (6) . |
| MLA | Al-Dweikat, Mohmmad et al. "A Review on Thomson Coil Actuators in Fast Mechanical Switching" . | ACTUATORS 11 . 6 (2022) . |
| APA | Al-Dweikat, Mohmmad , Cui, Jian , Sun, Shuai , Yang, Mingming , Zhang, Guogang , Geng, Yingsan . A Review on Thomson Coil Actuators in Fast Mechanical Switching . | ACTUATORS , 2022 , 11 (6) . |
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Abstract ：
Ultra-high voltage fast vacuum circuit breakers (FVCBs) could benefit a power system by promoting transient stability because their opening and closing times are significantly lower than those of commonly used circuit breakers at transmission voltage. This paper presents the design and verification of a prototype 363-kV/5000-A - 63-kA multiple-break FVCB. The prototype consists of two parallel-connected circuit branches in each phase. Each branch comprises three breaking units. The breaking unit, arranged on a 330-kV-class insulating platform, is a double-break FVCB driven by two independent electromagnetic repulsion actuators. The breaking units include a specially designed 40.5-kV vacuum interrupter (VI) with an extended ceramic envelope and optimized contact contours. A 4.0-nF grading capacitor is connected in parallel with each break to achieve a uniform stressed voltage distribution across the break. The prototype performs controlled switching of short-circuit current with an arcing time of 2.0 ms. The feasibility of the 363-kV FVCB is verified by a dielectric test on one break of the prototype and a series of tests on a single-phase prototype according to the international standard IEC 62271-100, 2017 and the Chinese standard GB 1984-2014. The tests include controlled switching of a short-circuit current in a short arcing time under different transient recovery voltages following test duties T100s(b) and T100a, short-time withstand current and peak withstand current tests, a temperature rise test, and an electromagnetic compatibility test.
Keyword ：
Capacitors Ceramics Circuit breakers Electric fields Electromagnetic repulsion actuator fast vacuum circuit breaker grading capacitors Interrupters multiple-break Prototypes Voltage control
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| GB/T 7714 | Yao, Xiaofei , Guan, Chen , Wang, Chuan et al. Design and Verification of an Ultra-High Voltage Multiple-Break Fast Vacuum Circuit Breaker [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2022 , 37 (5) : 3436-3446 . |
| MLA | Yao, Xiaofei et al. "Design and Verification of an Ultra-High Voltage Multiple-Break Fast Vacuum Circuit Breaker" . | IEEE TRANSACTIONS ON POWER DELIVERY 37 . 5 (2022) : 3436-3446 . |
| APA | Yao, Xiaofei , Guan, Chen , Wang, Chuan , Ai, Shaogui , Wang, Jianhua , Liu, Zhiyuan et al. Design and Verification of an Ultra-High Voltage Multiple-Break Fast Vacuum Circuit Breaker . | IEEE TRANSACTIONS ON POWER DELIVERY , 2022 , 37 (5) , 3436-3446 . |
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Abstract ：
The research on decomposition characteristics of SF6 and its by-products have great significance to the operation, maintenance, condition assessment and fault diagnosis of power equipment. In this paper, the particle composition models of SF6, SF6/polytetrafluoroethylene (PTFE), SF6/PTFE/O-2, SF6/PTFE/H2O, and SF6/PTFE/O-2/H2O were established by using Gibbs free energy minimization method, and the effects of trace H2O and O-2 impurities and PTFE vapour on SF6 by-products were studied by the models. In order to verify the correctness of the simulation results, a series of breaking experiments were carried out on a 40.5 kV SF6 circuit breaker, and a gas chromatograph was used to detect and analyse the SF6 by-products. It was found that when PTFE vapour is involved in the arc plasma, the main by-product after arc quenching is CF4, and the molar fractions of C2F6 and C3F8 are very low. When O-2 is involved, the main by-products are SOF2, SO2 and SO2F2, and a small amount of CO and CO2 was also produced. When H2O is involved, the main by-products in simulation are SOF2, SO2 and HF, and a small amount of SO2, CO2, CO, SO2F2 and H-2 was also produced. The experimental results are in good agreement with the above results.
Keyword ：
breaking experiment Gibbs free energy minimization method H2O and O-2 impurities PTFE vapour SF6 by-products
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| GB/T 7714 | Yang, Ren , Xu, Mengyuan , Yan, Jing et al. Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products [J]. | ENERGIES , 2021 , 14 (2) . |
| MLA | Yang, Ren et al. "Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products" . | ENERGIES 14 . 2 (2021) . |
| APA | Yang, Ren , Xu, Mengyuan , Yan, Jing , Yang, Minghao , Geng, Yingsan , Liu, Zhiyuan et al. Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products . | ENERGIES , 2021 , 14 (2) . |
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Abstract ：
There is an increasing tendency to integrate several High-temperature superconducting equipment into a network. Along with it is the increasing demand for cryogenic power switches that could work in the liquid nitrogen (LN2) to reduce temperature transfer areas. However, none of the current AC arc extinguishing mediums could work reliably in the LN2. As the insulation and cooling medium of the HTS equipment, LN2 can be a potential arc extinguishing medium due to its strong cooling effect. However, the AC interruption performance of LN2 is unknown up to now. The objective of this paper is to obtain the AC interruption performance of the LN2. A free-burning type and a magnetic blowout type LN2 switch are tested, respectively. Current ranging from 1 kA to 6.3 kA is conducted. Heat loss of the arcing process is also calculated. Experimental results show that a 2700A AC is successfully interrupted by the free burning type switch at a 10 mm gap. The increase of the contact gap leads to slight growth in current interruption ability. Meanwhile, the magnetic blowout type can interrupt an AC higher than 6300 A. Based on the high interrupting properties of LN2, a potential application in novel environmentally friendly switchgear is proposed. The LN2 switch in the switchgear can switch the closed-loop current that could be typically more than 50% of the continuous current. Meanwhile, the heat loss generated during the arcing process will not add an extra burden to the cooling system of the switchgear.
Keyword ：
AC circuit breakers AC interruption applied superconductivity cryogenic system magnetic field effects
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| GB/T 7714 | Xiang, Bin , Li, Hongxu , Junaid, Muhammad et al. AC Current Interruption Characteristics of Liquid Nitrogen [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
| MLA | Xiang, Bin et al. "AC Current Interruption Characteristics of Liquid Nitrogen" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) . |
| APA | Xiang, Bin , Li, Hongxu , Junaid, Muhammad , Wang, Dongyu , Geng, Yingsan , Liu, Zhiyuan et al. AC Current Interruption Characteristics of Liquid Nitrogen . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
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Abstract ：
Impulse breakdown voltage is one of the most important factors for the designation of the R-SFCLs. However, no research about the polarity effect on standard lightning impulse in LN2/insulation barrier composite systems has been reported. The objective of this paper is to study the polarity effect on the standard lightning impulse in the LN2/insulation barrier composite systems. The 50% impulse breakdown voltage was measured with a pair of the needle to plane electrodes with the 0.05 mm thick PTFE film. The gap length of the two electrodes was 10 mm. The distance between the needle electrode and the insulation barrier was varied. The time delays during the breakdown progress were recorded by the oscilloscope. The breakdown path was determined by the arc traces on the PTFE films. The results showed that the 50% impulse breakdown voltage of the LN2/insulation barrier composite increased with the insulation barrier get closer to the needle electrode. The results of the time delays reflect that in negative polarity, all the breakdowns occurred in the tail of the waveform. In positive polarity, most of the breakdowns occurred in the head of the waveform. With the barrier get closer to the insulation barrier, the longer time delay Tdelay was in both polarities. And the probability of wave tail breakdown increased in positive polarities. The arc traces on the PTFE showed that all the breakdowns were occurred through the PTFE film.
Keyword ：
Barrier effect breakdown time delays impulse breakdown LN2 polarity effect
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| GB/T 7714 | Gao, Lei , Xiang, Bin , Zhang, Jiahui et al. Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
| MLA | Gao, Lei et al. "Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) . |
| APA | Gao, Lei , Xiang, Bin , Zhang, Jiahui , Tu, Youping , Li Hongxu , Liu, Zhiyuan et al. Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
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Abstract ：
A quick elimination of short-circuit faults in a short time can significantly promote the transient stability of an AC power grid. This paper proposes controlled fast vacuum breaking (CFVB) of a short-circuit current within a short-arcing time. The CFVB technology performs the following: determining a lower-limit opening speed of 3.5 m/s for a 40.5 kV fast vacuum circuit breaker (FVCB), quickly predicting the fault current-zero within 4.0 +/- 0.4 ms to command the FVCB to open at a selected current phase-angle, and optimizing an electromagnetic repulsion actuator with an opening time of 2.5 +/- 0.05 ms to achieve an accurate opening operation. The CFVB technology was deployed in a prototype of single-phase multiple-break 363 kV FVCB to validate its feasibility. The validation involved test duties of T100s(b) and T100a following standards IEC 62271-100 2017 and GB/T 1984-2014. Test results demonstrated that by adopting the CFVB technology, the 363 kV FVCB can successfully interrupt a fault current of 80 kA rms within the first half-wave fault current with a short-arcing time of 2.5 ms. Further application of the CFVB technology could help promote the transient stability of power distribution and transmission systems.
Keyword ：
Arcing time controlled fast vacuum breaking electromagnetic repulsion actuator fast vacuum circuit breaker
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| GB/T 7714 | Yao, Xiaofei , Guan, Chen , Ding, Jian'gang et al. Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
| MLA | Yao, Xiaofei et al. "Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) . |
| APA | Yao, Xiaofei , Guan, Chen , Ding, Jian'gang , Ai, Shaogui , Ma, Kui , Wang, Jianhua et al. Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
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Abstract ：
The high conduction loss of solid-state circuit breakers blocks the HTS electrical system implementation for future aircraft. An LN2 switch marries the low conduction loss with good DC interruption performance in the cryogenic circumstance. It shows a fascinating prospect in the HTS electrical system. However, the possible applications of such a novel switch have never been discussed. This paper proposed two potential strategies for applying the LN2 switch into the HTS electrical system. A low voltage experiment is conducted to validate the combination of the SFCL with an LN2 switch. Heat loss is also calculated based on the experimental results. Same level solid-state circuit breakers with cryogenic parameters are set as a fair comparison. A 10 kA prospective short circuit current is limited to 1.4 kA by SFCL within 580 mu s and then interrupted by the LN2 switch within 12 ms. The fast response of SFCL compensates for the long clear time of the LN2 switch. Heat loss of this combination is 1/120 of the heat generated by the same level SSCB in an assumed 2-hour flight. With proper design, such a combination could meet the protection requirements of any specific HTS electrical system. Refrigeration system size and weight can be significantly reduced.
Keyword ：
Aircraft power systems cryogenic electronics DC circuit breakers high-temperature superconductors (HTS) liquid nitrogen superconductive fault current limiter
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| GB/T 7714 | Li, Hongxu , Xiang, Bin , Wang, Dongyu et al. Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
| MLA | Li, Hongxu et al. "Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) . |
| APA | Li, Hongxu , Xiang, Bin , Wang, Dongyu , Gao, Lei , Geng, Yingsan , Liu, Zhiyuan et al. Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) . |
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