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< Page ,Total 19 >
Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period EI Scopus SCIE
期刊论文 | 2019 , 66 (3) , 2355-2365 | IEEE Transactions on Industrial Electronics
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Abstract :

The alternate arm converter (AAC) is a promising candidate for HVDC converter stations due to its reduced number of devices and capability of blocking the DC fault current. This paper is focused on modelling and control of the AAC with an extended overlap period. First a generic mathematical model considering all the switching state combinations of the AAC is developed, which governs the characteristic of the time-varying, three-phase imbalanced circuit parameters of the AAC. Based on the developed model, an AC-side current control strategy with a feed-forward compensation method to overcome the time-varying nature of the circuit parameters is proposed. Then, by introducing the so-called "double-overlap period", a synthetic circulating current strategy is proposed, which enables both DC current active filtering and zero-current switching of the director switches. The validity of the model and effectiveness of the proposed strategies are confirmed by simulation studies on an HVDC system. IEEE

Keyword :

Alternate arm converter Circulating current Current control strategy Feed-forward compensation HVDC converter station HVDC systems Modelling and controls Modular multilevel converters

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GB/T 7714 Liu, Shenquan , Saeedifard, Maryam , Wang, Xifan . Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period [J]. | IEEE Transactions on Industrial Electronics , 2019 , 66 (3) : 2355-2365 .
MLA Liu, Shenquan 等. "Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period" . | IEEE Transactions on Industrial Electronics 66 . 3 (2019) : 2355-2365 .
APA Liu, Shenquan , Saeedifard, Maryam , Wang, Xifan . Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period . | IEEE Transactions on Industrial Electronics , 2019 , 66 (3) , 2355-2365 .
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Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum EI Scopus CSCD PKU
期刊论文 | 2018 , 44 (6) , 2019-2026 | Gaodianya Jishu/High Voltage Engineering
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Abstract :

Multiple re-ignition overvoltage is determined by dielectric recovery strength after interruption of small inductive currents in vacuum. We established a micro-physical model for small inductive current interruption in vacuum, with which the influence of load parameters on the re-ignitions can be determined, so as to reveal the sheath development process after interruption of small inductive current in vacuum. The following micro-parameters were determined, including the ion density, ion speed, development of electric field, and potential distribution under various TRVs. A critical electric field strength at the cathode was chosen as a criterion for the re-ignition. The simulation results show the following influence of load parameters on the re-ignitions of small current inductive current interruption in vacuum. A higher load capacitance or a higher load inductance will decrease the sheath development speed and the maximum field strength, which decreases the overvoltage and the risk of re-ignition. The sheath speed and the maximum field strength does not change with the increase of the equivalent resistance, but the load current decreases with the increase of the equivalent resistance. A lower load current reduces sheath velocity, which results in a lower maximum electric field strength. Therefore, it decreases the risk of re-ignition. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Dielectric recovery Inductive current Over-voltages Sheath Vacuum circuit breaker

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GB/T 7714 Wang, Feng , Wang, Zhongyi , Hao, Mengmeng et al. Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum [J]. | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (6) : 2019-2026 .
MLA Wang, Feng et al. "Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum" . | Gaodianya Jishu/High Voltage Engineering 44 . 6 (2018) : 2019-2026 .
APA Wang, Feng , Wang, Zhongyi , Hao, Mengmeng , Liu, Zhiyuan . Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum . | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (6) , 2019-2026 .
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A Closed-Loop Velocity Control System for Electromagnetic Railguns EI
期刊论文 | 2018 | IEEE Transactions on Plasma Science
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Abstract :

The electromagnetic railguns possess the characteristics of active and accurate control of the muzzle velocity. As to our understanding, the muzzle velocity control has two levels. One is to design the triggering strategy of the pulsed power supplies before the launching process, while the other is to adjust the triggering strategy during the launching process. The objective of the first one is to realize the desired muzzle velocity with ideal system parameters, and the target of the second one is to design a closed-loop adjusting system for the precalculated triggering strategy, so as to keep the actual muzzle velocity equal or closed to the desired value when the launching process has some kind of turbulences, e.g., nonideal charging voltage and errors of the armature mass. This paper proposes a closed-loop velocity control system and four different methods to adjust the actual muzzle velocity in real launching time. The core idea of this system is to detect the armature velocities at key points along the rails and adjust the following triggering pulsed forming unit (PFU) number of the pulsed power supplies. In simulations, the desired muzzle velocity is 2000 m/s, the capacitance of the energy storage capacitors CPFU is 2 mF, the precharged voltage U&#x2080; is 5 kV, and the armature mass m is 0.15 kg. Without the closed-loop adjusting, if U&#x2080;, CPFU, and m simultaneously and randomly change within [-2&#x0025;, 2&#x0025;] in actual operations, the muzzle velocity relative errors are within [0&#x0025;, 2.1346&#x0025;]. However, after using this closed-loop system, the results show that the muzzle velocity errors can be less than 1&#x0025;, even when there is &#x00B1; 0.5&#x0025; detection error. IEEE

Keyword :

Adjusting system Charging voltage Closed loop velocity control systems Electromagnetic rail guns Energy storage capacitor Power supply Pulsed power supply triggering

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GB/T 7714 Chang, Xinyue , Yu, Xinjie , Liu, Xukun et al. A Closed-Loop Velocity Control System for Electromagnetic Railguns [J]. | IEEE Transactions on Plasma Science , 2018 .
MLA Chang, Xinyue et al. "A Closed-Loop Velocity Control System for Electromagnetic Railguns" . | IEEE Transactions on Plasma Science (2018) .
APA Chang, Xinyue , Yu, Xinjie , Liu, Xukun , Li, Zhen , He, Hongzhuang . A Closed-Loop Velocity Control System for Electromagnetic Railguns . | IEEE Transactions on Plasma Science , 2018 .
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A New Topology of Switched-Capacitor Multilevel Inverter for Single-Phase Grid-Connected with Eliminating Leakage Current EI
会议论文 | 2018 , 2854-2859 | 8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
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Abstract :

A new switched-capacitor multilevel inverter (SCMLI) topology for grid-connected photovoltaic (PV) systems with eliminating the leakage current is presented in this study. Due to directly connecting the negative pole of the PV cells to the neutral line of the grid, the leakage current will be decreased to zero. The newest topologies for SCMLI are based on H-bridge stage; that means the common mode voltage in output is variable and leads to leakage current. The main advantages of this new topology are: (1) It does not need the boost stage; thus, it has light weight and small size. (2) The negative pole of the PV is directly connected to the neutral line of the grid, so the leakage current is eliminated. (3) Has good capability to conduct the reverse current from the inductive load to the dc source. (4) By using the Sinusoidal Pulse-Width Modulation (SPWM) technique the voltage of capacitors are self-balanced, thus this structure has the ability to be extended as n-level SCMLI and reduces the output filter size. The 9-level structure of the proposed inverter is simulated. The performance of which will be verified by MATLAB/SIMULINK software. © 2018 IEEJ Industry Application Society.

Keyword :

Grid-connected photovoltaic system Light weight and small sizes Matlab/Simulink software Modulation techniques Multilevel inverter Sinusoidal pulse width modulation step up Switched capacitor

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GB/T 7714 Samizadeh, Mehdi , Yang, Xu , Karami, Bagher et al. A New Topology of Switched-Capacitor Multilevel Inverter for Single-Phase Grid-Connected with Eliminating Leakage Current [C] . 2018 : 2854-2859 .
MLA Samizadeh, Mehdi et al. "A New Topology of Switched-Capacitor Multilevel Inverter for Single-Phase Grid-Connected with Eliminating Leakage Current" . (2018) : 2854-2859 .
APA Samizadeh, Mehdi , Yang, Xu , Karami, Bagher , Chen, Wenjie , Houran, Mohamad Abou , Abrishamifar, Adib et al. A New Topology of Switched-Capacitor Multilevel Inverter for Single-Phase Grid-Connected with Eliminating Leakage Current . (2018) : 2854-2859 .
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Game theory-based optimal deloading control of wind turbines under scalable structures of wind farm EI
期刊论文 | 2018 , 3 (4) , 224-231 | IET Cyber-Physical Systems: Theory and Applications
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Abstract :

This study addresses the problem of how to harvest as much kinetic energy as possible during deloading control of variable speed wind turbines (VSWTs) by distributedly adjusting rotor speeds under scalable wind farm topology. To that end, a game theory-based distributed control framework is investigated to enable the optimal rotor speed setting of VSWTs such that maximal kinetic energy can be stored in rotating masses of VSWTs for further system support, and meanwhile, the power dispatch objective for VSWTs can be fulfilled. It is shown that through distributedly detecting the changing network topologies within wind farm, the proposed methodology enables individual VSWT to adaptively increase its stored kinetic energy while requiring only local information sharing. It is important both theoretically and practically that the design has autonomously guaranteed maximal kinetic energy storing for all VSWTs in wind farm of time varying topologies and provides robustness, scalability and efficiency in the absence of global information sharing. Simulation results and case studies are included to demonstrate the effectiveness of the proposed controls both in Matlab and DIgSILENT/PowerFactory. © 2018 Institution of Engineering and Technology. All Rights Reserved.

Keyword :

Control of wind turbines Distributed control Global informations Local information sharing Network topology Optimal rotor speed Time varying topology Variable speed wind turbines

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GB/T 7714 Zhang, Jianliang , Li, Yujun , Xu, Zhao et al. Game theory-based optimal deloading control of wind turbines under scalable structures of wind farm [J]. | IET Cyber-Physical Systems: Theory and Applications , 2018 , 3 (4) : 224-231 .
MLA Zhang, Jianliang et al. "Game theory-based optimal deloading control of wind turbines under scalable structures of wind farm" . | IET Cyber-Physical Systems: Theory and Applications 3 . 4 (2018) : 224-231 .
APA Zhang, Jianliang , Li, Yujun , Xu, Zhao , Qi, Donglian , Li, Chaoyong . Game theory-based optimal deloading control of wind turbines under scalable structures of wind farm . | IET Cyber-Physical Systems: Theory and Applications , 2018 , 3 (4) , 224-231 .
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Ensemble recurrent neural network based probabilistic wind speed forecasting approach EI Scopus CSSCI-E SCIE
期刊论文 | 2018 , 11 (8) | Energies
WoS CC Cited Count: 2 SCOPUS Cited Count: 4
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Abstract :

Wind energy is a commonly utilized renewable energy source, due to its merits of extensive distribution and rich reserves. However, as wind speed fluctuates violently and uncertainly at all times, wind power integration may affect the security and stability of power system. In this study, we propose an ensemble model for probabilistic wind speed forecasting. It consists of wavelet threshold denoising (WTD), recurrent neural network (RNN) and adaptive neuro fuzzy inference system (ANFIS). Firstly, WTD smooths the wind speed series in order to better capture its variation trend. Secondly, RNNs with different architectures are trained on the denoising datasets, operating as sub-models for point wind speed forecasting. Thirdly, ANFIS is innovatively established as the top layer of the entire ensemble model to compute the final point prediction result, in order to take full advantages of a limited number of deep-learning-based sub-models. Lastly, variances are obtained from sub-models and then prediction intervals of probabilistic forecasting can be calculated, where the variances inventively consist of modeling and forecasting uncertainties. The proposed ensemble model is established and verified on less than one-hour-ahead ultra-short-term wind speed forecasting. We compare it with other soft computing models. The results indicate the feasibility and superiority of the proposed model in both point and probabilistic wind speed forecasting. © 2018 by the authors.

Keyword :

Adaptive neuro fuzzy inference systems (ANFIS) Adaptive neuro-fuzzy inference system Ensemble learning Probabilistic forecasting Recurrent neural network (RNN) Short-term wind speed forecasting Wavelet threshold de-noising Wind speed forecasting

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GB/T 7714 Cheng, Lilin , Zang, Haixiang , Ding, Tao et al. Ensemble recurrent neural network based probabilistic wind speed forecasting approach [J]. | Energies , 2018 , 11 (8) .
MLA Cheng, Lilin et al. "Ensemble recurrent neural network based probabilistic wind speed forecasting approach" . | Energies 11 . 8 (2018) .
APA Cheng, Lilin , Zang, Haixiang , Ding, Tao , Sun, Rong , Wang, Miaomiao , Wei, Zhinong et al. Ensemble recurrent neural network based probabilistic wind speed forecasting approach . | Energies , 2018 , 11 (8) .
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Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT EI SCIE
期刊论文 | 2018 , 33 (6) , 6894-6903 | IEEE Transactions on Power Systems
WoS CC Cited Count: 1
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Abstract :

As Type-3 wind turbine (WT) has already become a typical type of highly penetrated power sources in modern power systems, characterizing its properties during grid fault is a basic requirement for system analysis. However, many significant factors have not been considered in the existing analytical methods and results, such as various switching of internal control and protection circuits in low voltage ride through (LVRT) solutions. In this paper, performance of Type-3 WT during LVRT is first illustrated and summarized as the sequential switching characteristic in multi time scales, viz., instant control, ac control, dc voltage control, and rotor speed control time scales. Thus, for magnitude drops in stator voltage, a mathematical model is proposed to understand this characteristic and fault current analysis's features. Then, an analytical method, based on the operational inductance, is proposed so that fault current components, with the sequential switching considered, can be depicted with a unified and simple analytical expression. By identifying magnitude of symmetrical current, the transient and steady-state equivalent circuits of Type-3 WT are proposed to estimate momentary current and electrical power approximately. Finally, analytical results are verified by comparisons with real-time simulation results of a detailed 1.5 MW WT model in RT-LAB. © 1969-2012 IEEE.

Keyword :

Analytical expressions Circuit faults Doubly Fed Induction generators (DFIG) Fault current components Low voltage ride through (LVRT) Multi-time scale Real time simulations Switching characteristics

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GB/T 7714 Chang, Yuanzhu , Hu, Jiabing , Tang, Wangqianyun et al. Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT [J]. | IEEE Transactions on Power Systems , 2018 , 33 (6) : 6894-6903 .
MLA Chang, Yuanzhu et al. "Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT" . | IEEE Transactions on Power Systems 33 . 6 (2018) : 6894-6903 .
APA Chang, Yuanzhu , Hu, Jiabing , Tang, Wangqianyun , Song, Guobing . Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT . | IEEE Transactions on Power Systems , 2018 , 33 (6) , 6894-6903 .
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Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks EI Scopus CPCI-S SCIE
期刊论文 | 2018 , 54 (6) , 5822-5832 | IEEE Transactions on Industry Applications
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Abstract :

This paper proposed a varying magnetic network modeling method of dual-rotor permanent magnet reluctance (DRPMR) machines based on magnetic circuits considering possible saturation and nonlinearity according to the physical structure, which is put forward to obtain the accurate inductance characteristics of the proposed machine. The feasibility of this analytical model is confirmed by the finite element method. Moreover, experiments are designed to validate the analytical results. It indicates that the analytical inductance characteristics of the DRPMR machine have good agreements with the experimental results. © 1972-2012 IEEE.

Keyword :

Analytical results Dual rotors Finite element analysis method Inductance calculation Magnetic network models Magnetic networks Physical structures Stator winding

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GB/T 7714 Du, Jinhua , Xue, Yuntian , Liu, Quanwei et al. Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks [J]. | IEEE Transactions on Industry Applications , 2018 , 54 (6) : 5822-5832 .
MLA Du, Jinhua et al. "Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks" . | IEEE Transactions on Industry Applications 54 . 6 (2018) : 5822-5832 .
APA Du, Jinhua , Xue, Yuntian , Liu, Quanwei , Wang, Shuhong . Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks . | IEEE Transactions on Industry Applications , 2018 , 54 (6) , 5822-5832 .
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Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers EI Scopus SCIE
期刊论文 | 2018 , 46 (12) , 4099-4108 | IEEE Transactions on Plasma Science
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Abstract :

Prefire is the unexpected breakdown of gas switch at triggered mode and have to be limited at extremely low level in fast linear transformer driver (FLTD). In this paper, the dispersion of breakdown voltage as well as prefire characteristics of high pressure gas spark switches under typical working conditions of FLTD was investigated and reported. Tested switches included a three-electrode field-distortion gas switch (TFGS) and a six-stage multichannel gas switch (SMGS), which had compact structure and low inductance. The results showed that the self-breakdown voltage of both TFGS and SMGS obeyed three parameter well-bull distribution and the dispersion of Ub at &#x00B1; 90 kV could reach 4&#x0025; of TFGS and 14&#x0025; of SMGS, respectively. The dispersion of Ub was remarkably influenced by the floating potential of middle electrode. By grounding the triggering electrode via a kilohm resistor, the dispersion of Ub decreased to 2&#x0025; in TFGS and 6.5&#x0025; in SMGS, respectively. When a voltage equalization method by cascade resistors was introduced, the dispersion of Ub in SMGS dramatically decreased to 4.4&#x0025;. In repetitive operation at triggered mode, the prefire rate of TFGS reached 0.9&#x0025; at &#x0263; = 80&#x0025; working coefficient and decreases with the decrease of &#x0263; , being 0.3&#x0025; at &#x0263; = 72&#x0025; and 0.2&#x0025; at &#x0263; = 65&#x0025;, respectively. The prefire rate of SMGS was much higher, reaching 1.7&#x0025; at &#x0263; = 72&#x0025; and 0.7&#x0025; at &#x0263; = 65&#x0025;, and decreased to 0.6&#x0025; and 0.3&#x0025;, respectively, after applying the equalizing resistors. Generally, the prefire rate of SMGS was somewhat higher than that of TFGS with the same working coefficient and the floating potential limiting was imperative for prefire inhibition. IEEE

Keyword :

Compact structures Fast linear transformer drivers Floating potentials Gas switch High pressure gas prefire Repetitive operations Self-breakdown voltages

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GB/T 7714 Li, Xiaoang , Pei, Zhehao , Ma, Chaoqun et al. Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers [J]. | IEEE Transactions on Plasma Science , 2018 , 46 (12) : 4099-4108 .
MLA Li, Xiaoang et al. "Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers" . | IEEE Transactions on Plasma Science 46 . 12 (2018) : 4099-4108 .
APA Li, Xiaoang , Pei, Zhehao , Ma, Chaoqun , Zhang, Yuzhao , Zhang, Qiaogen . Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers . | IEEE Transactions on Plasma Science , 2018 , 46 (12) , 4099-4108 .
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A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption EI Scopus SCIE
期刊论文 | 2018 , 33 (6) , 2822-2828 | IEEE Transactions on Power Delivery
SCOPUS Cited Count: 2
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Abstract :

Controlled switching technology operates circuit breakers at the minimum arcing time for short-circuit current interruption. However, there is no report to reveal a relationship between the short-circuit current interrupting capability with the minimum arcing time and the opening velocities of vacuum interrupters. The objective of this paper is to reveal a relationship between the short-circuit current interrupting capability with the minimum arcing time and the opening velocities of vacuum interrupters. A 40.5 kV fast vacuum circuit breaker prototype was built up which was equipped with a commercial 40.5 kV-31.5 kA vacuum interrupter and it was driven by an electromagnetic repulsion mechanism. It provided an average velocities ranging from 2.5 to 5.5 m/s. 50 times of 40 kA short-circuit current interrupting tests were carried out in a synthetic circuit. Test results showed that the minimum arcing time of successful interruption decreased with the increasing of the average opening velocity. The minimum arcing gap was determined as 1.8 mm and it kept as a constant as the average opening velocity increased. The experiment results also showed a relationship between the arc energy density and the arc extinguishing gap, which acted a linear boundary between the successful and failure short-current interruptions. IEEE

Keyword :

Interrupters minimum arcing interrupting capability Power system reliability Vacuum arcs Vacuum interrupters

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GB/T 7714 Zhang, Bojian , Ren, Li , Ding, Jian'gang et al. A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption [J]. | IEEE Transactions on Power Delivery , 2018 , 33 (6) : 2822-2828 .
MLA Zhang, Bojian et al. "A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption" . | IEEE Transactions on Power Delivery 33 . 6 (2018) : 2822-2828 .
APA Zhang, Bojian , Ren, Li , Ding, Jian'gang , Wang, Jianhua , Liu, Zhiyuan , Geng, Yingsan et al. A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption . | IEEE Transactions on Power Delivery , 2018 , 33 (6) , 2822-2828 .
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