Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 8 papers published in subject: > since this site started. |
Results per page: |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. The Influence of Lagged Axial Magnetic Field on the Distribution of Cathodes Spots in Current-zero Stage of Vacuum Arc | |||
Jia Shenli,Song Xiaochuan,Shi Zongqian,Wang lijun,Zhang Yingkui | |||
Dynamic and Electronic Engineering 19 March 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The influence of lagged axial magnetic field (AMF) due to eddy current induced in contacts system on the distribution of cathode spots (CSs) in current-zero stage of vacuum arc with different current falling rates was investigated experimentally. Experiments were conducted with cup-shaped AMF contacts in a demountable vacuum chamber. The characteristic of CSs distribution of triggered vacuum arc in current-zero stage with arc current frequency of 50Hz was investigated at first with the aid of a high-speed digital camera with an exposure time of 2 microseconds. Then the characteristic of CSs distribution with faster current falling rate, which was realized by injecting a countercurrent with frequency of 500Hz or 1kHz, was investigated. Moreover, the lagged AMF flux density in current-zero stage with different current falling rates was calculated by ANSYS. Research results showed that CSs located in the center of contact plate tended to extinguish earlier than those at periphery of contact plate in fast current-zero stage due to the stronger lagged AMF in contact center. | |||
TO cite this article:Jia Shenli,Song Xiaochuan,Shi Zongqian, et al. The Influence of Lagged Axial Magnetic Field on the Distribution of Cathodes Spots in Current-zero Stage of Vacuum Arc[OL].[19 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528043 |
2. Numerical simulation on the motion of cathode spots in high-current vacuum arc | |||
Jia Shenli,Song Xiaochuan,Shi Zongqian,Wang Lijun | |||
Dynamic and Electronic Engineering 11 March 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this paper, the motion of high-current vacuum arc cathode spots is simulated numerically. The transverse magnetic field is computed by commercial software ANSYS with the current distribution in contact plate taken into account. The initial expansion process of cathode spots in triggered vacuum arc under self-generated azimuthal magnetic field without external AMF is simulated at first as a reference. Then three kinds of external AMF distributions are applied, i.e. uniform AMF, bell-shaped AMF and saddle-shaped AMF distribution. Simulation results show that cathode spots expand faster without external applied AMF than that under AMF. Further more, the distribution of AMF has significant influence on the motion pattern and the distribution of cathode spots on cathode surface, e.g., the concentration of cathode spots in the centre region under bell-shaped AMF is more serious than that under saddle-shaped AMF. The results also show that a ring-shaped distribution of cathode spots is not a stable configuration. | |||
TO cite this article:Jia Shenli,Song Xiaochuan,Shi Zongqian, et al. Numerical simulation on the motion of cathode spots in high-current vacuum arc[OL].[11 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528056 |
3. Novel Bistable PM Electromagnetic Clutch Unit for Wheel EV Drive | |||
CaiWanli,GuChenglin | |||
Dynamic and Electronic Engineering 06 February 2013 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:A rigid connection between hub and motor in wheel electric vehicle (EV) drive makes the mechanical and electromagnetic impulsion inevitable especially in starting and braking. Referring to the mechanical clutch solution used in conventional cars, this paper tries to adopt an electromagnetic clutch between hub and motor, aiming to weaken the impulsion flexibly by an electrically-controlled connection. Accordingly, a novel bistable permanent magnet (PM) electromagnetic clutch unit is proposed. General design principle for this unit is investigated in detail and the magnetic field analysis is carried on getting the leakage coefficient. Analysis results show that the novel clutch would be a well-competitive challenger. | |||
TO cite this article:CaiWanli,GuChenglin. Novel Bistable PM Electromagnetic Clutch Unit for Wheel EV Drive[OL].[ 6 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4519500 |
4. Numerical simulation of anode activity under action of high-current vacuum arc | |||
Wang Lijun ,Yang Dingge ,Jia Shenli ,Liu Ke ,Shi Zongqian | |||
Dynamic and Electronic Engineering 28 April 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Anode activity is critical for success or failure of vacuum interrupters when arc current attains to a certain limiting value. Based on mathematical model of anode activity, anode thermal process under action of high-current arc column is simulated. Simulation results show that for sinusoid current, anode surface temperature firstly increases rapidly, then decreases slower. With the increase of heat flux density to anode, anode surface temperature will be increased. The maximal value of anode surface temperature appears near 7ms moment. Simulation results also are compared with experimental results. | |||
TO cite this article:Wang Lijun ,Yang Dingge ,Jia Shenli , et al. Numerical simulation of anode activity under action of high-current vacuum arc[OL].[28 April 2009] http://en.paper.edu.cn/en_releasepaper/content/31782 |
5. Coupling Computation of Electric-Gas Flow Interaction of High Voltage SF6 Circuit Breaker | |||
Liu Xiaoming,Cao Yundong,Tang Tao | |||
Dynamic and Electronic Engineering 05 August 2007 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Studying the dielectric recovery characteristics from interaction of electric field and gas flow field in high voltage circuit breakers (HV CBs), a two dimensional coupling physical-mathematical model was developed. Such a quantitative analysis has not been reported until now for HV SF6 CB because of the complexity of the dynamic interrupting course. And the influence of shock wave and turbulent flow has been taken into consideration for the computation of gas flow field. To realize the dynamic simulation of the coupling field, this paper describes the automatic generation method of self-adaptive meshing grid for electric field computation and slippage meshing grid for gas flow field computation, and the implement course. Thus, the numerical experiment of the interrupting course of CB has been performed and discussed. | |||
TO cite this article:Liu Xiaoming,Cao Yundong,Tang Tao. Coupling Computation of Electric-Gas Flow Interaction of High Voltage SF6 Circuit Breaker[OL].[ 5 August 2007] http://en.paper.edu.cn/en_releasepaper/content/14394 |
6. Optimization on Electrode Contour of SF6 Arc-quenching Chamber Based on Variable Interval Genetic Algorithm | |||
Liu Xiaoming,Wen Fuyue,Cao Yundong | |||
Dynamic and Electronic Engineering 05 August 2007 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Electrode contour optimization of arc quenching chamber of 550 kV 1-break extra high voltage SF6 circuit breaker using the proposed variable interval genetic algorithm (VIGA) has been carried out to obtain not only a uniform field but also a dynamic distribution of electric field strength along different contact surface. In order to investigate the effectiveness of the VIGA quantitatively, optimization of two testing functions has been computed in detail. From comparison of the optimized solution with the analytical for the testing functions, the feasibility and validity of the proposed VIGA has been verified. Moreover, in optimization, for enhancing the convergence efficiency of the optimization, the real-coded mode and the improved blend-crossover strategy is proposed and applied. | |||
TO cite this article:Liu Xiaoming,Wen Fuyue,Cao Yundong. Optimization on Electrode Contour of SF6 Arc-quenching Chamber Based on Variable Interval Genetic Algorithm[OL].[ 5 August 2007] http://en.paper.edu.cn/en_releasepaper/content/14390 |
7. Study on Domain Coupling of Multi-physical Parameters for High Voltage SF6 Circuit Breaker | |||
Cao Yundong,Liu Xiaoming,Wang Erzhi | |||
Dynamic and Electronic Engineering 05 August 2007 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Coupling of multi-physical parameters in extra high voltage SF6 circuit breaker (UHV SF6 CB) has been investigated. For 2D combined mathematical model of electric field, flow field and turbulent flow developed, the coupling condition of multi-physical field of CB was established. And the computations have been carried out for 500kV 1-break SF6 CB. The aerodynamic behavior and electrical characteristics varying with interrupting course have been investigated. In addition, the dielectric recovery characteristics (DRC) of the 500kV 1-break SF6 CB has been obtained, the visualization of breaking course has been realized. | |||
TO cite this article:Cao Yundong,Liu Xiaoming,Wang Erzhi. Study on Domain Coupling of Multi-physical Parameters for High Voltage SF6 Circuit Breaker[OL].[ 5 August 2007] http://en.paper.edu.cn/en_releasepaper/content/14385 |
8. Simulation on the Arc Plasma Behavior in Low Voltage Circuit Breaker | |||
Wang Qian | |||
Dynamic and Electronic Engineering 03 March 2005 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Taking into account the properties of the arc plasma and the electromagnetic, heat and radiative phenomena, commercial computational fluid dynamics software PHOENICS has been adapted and modified to develop the three-dimensional magneto-hydrodynamic (MHD) model of arc in a low voltage circuit breaker. The effects of the arc ignition location, venting size and gassing material on arc behavior are investigated. The analysis of the results show that the arc velocity accelerates with the increase of the distance between arc ignition location and of the venting size, and the existence of the gassing material benefits to improve the arc voltage and reduce the arc temperature. | |||
TO cite this article:Wang Qian. Simulation on the Arc Plasma Behavior in Low Voltage Circuit Breaker[OL].[ 3 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1632 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
Results per page: |
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated