Results 211 to 220 of about 13,323 (257)
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Modelling of DC arc discharge on ice surfaces
IEE Proceedings - Generation, Transmission and Distribution, 2000Using a triangular ice sample, the characteristics of the DC arc appearing on ice surfaces was investigated. Based on the results obtained, a model for predicting the 50% flashover voltage of ice-covered insulators energised with DC was presented. The model takes into account the ice surface conductivity, voltage polarity, and arc root radius. Moreover,
M. Farzaneh, J. Zhang
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DC Arc Model Including Circuit Constraints
IEEE Transactions on Power Apparatus and Systems, 1973Digital computer techniques are used to simulate a steady-state d-c arc. The (longitudinal) input and (radial) loss powers to a section of the positive column are used to establish the positive column temperature and electron density. A power balance is also used to derive cathode conditions.
D. Miller, J. Hildenbrand
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3-D Magnetohydrodynamic Modeling of DC Arc in Power System
IEEE Transactions on Industry Applications, 2016With the rise of large-scale photovoltaic arrays and dc buses in power systems, dc-arc hazards have raised great concerns. Currently, the IEEE Std. 1584-2002 pertains to arc flashes originating in only ac systems. Little research has been conducted to investigate the theoretical or semiempirical methods to estimate dc arcs.
null Shiuan-Hau Rau +2 more
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NUMERICAL MODELING OF ARC BEHAVIOR IN A DC PLASMA TORCH
High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes), 2006This paper describes a three-dimensional time-dependent model of a direct current plasma torch when the arc operates in the restrike mode. The model is based on the simultaneous solution of the conservation equations of mass, momentum, energy, electric current and electromagnetic equations.
Chazelas, Christophe +3 more
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DC Arc Fault Model Superimposing Multiple Random Arc Noise States on an Average Model
2019 20th Workshop on Control and Modeling for Power Electronics (COMPEL), 2019This paper presents a new series DC arc fault model to provide accurate simulations in systems such as photovoltaic (PV) arrays. The model is derived by observing the different physical arcing states in air which correspond to specific frequency spectrums. The foundation of the model is pink noise, which is used to derive a current noise power spectral
Jonathan C. Kim, Brad Lehman, Roy Ball
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DC series arc generation, characteristic and modelling with arc demonstrator and shaking table
12th IET International Conference on Developments in Power System Protection (DPSP 2014), 2014Electrical arcs are dangerous and can cause great damage such as electrical fire, therefore, detecting the arc faults for power electronic systems on aircraft, ship and automobile is now receiving considerable concern. To develop suitable detection and location schemes for arc faults, modelling arc faults to represent and predict arc characteristic and
null Jing Li +4 more
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Modelling of an ilmenite-smelting DC arc furnace process
Minerals Engineering, 2006Ilmenite smelters must be operated with the slag bath contained in a freeze lining of solidified slag to prevent refractory damage and ensure feasible furnace life. This makes the process an interesting and challenging one to operate and control. The study focused on interactions between the freeze lining and slag bath.
Johan H. Zietsman, P. Chris Pistorius
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Modeling and Simulation Study of Photovoltaic DC Arc Faults
2017The DC arc fault is a major threat to the safety of photovoltaic systems, a large amount of heat from sustained arcs leads to fire accidents. Therefore, detecting the arc faults for PV systems is receiving considerable concern. In order to develop accurate and rapid detection and location methods for arc faults, it is important to establish an arc ...
Zhihua Li +3 more
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Chaos-Based Modeling of DC Arc Furnaces for Power Quality Issues
IEEE Transactions on Power Delivery, 2004DC arc furnaces are more and more applied in large industrial systems and represent one of the major sources of perturbations for the feeding system. This paper deals with the problem of the dc arc modeling using three well-known chaotic attractors (Ro/spl uml/ssler, Chua, and Lorenz attractors).
G. CARPINELLI +3 more
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DC Electric Arc Furnace Modelling for Power Quality Indices Assessment
2020 19th International Conference on Harmonics and Quality of Power (ICHQP), 2020The operation of an Electric Arc Furnace (EAF) determines power quality disturbances in terms of voltage fluctuations and waveform distortions, due to the particular nature of the heating process and of the electric arc phenomenon. The analysis of DC EAFs and their induced power quality disturbances may be conveniently posed within a chaotic modeling ...
Bracale, Antonio +4 more
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