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Saturday, August 15, 2020 | History

2 edition of Characteristics of long vertical DC arc discharges found in the catalog.

Characteristics of long vertical DC arc discharges

Don J Latham

Characteristics of long vertical DC arc discharges

by Don J Latham

  • 231 Want to read
  • 1 Currently reading

Published by U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station in 0gden, UT .
Written in English

    Subjects:
  • Electric discharges,
  • Electric arc,
  • Lightning

  • Edition Notes

    SeriesResearch paper INT -- 407
    ContributionsIntermountain Research Station (Ogden, Utah)
    The Physical Object
    Pagination32 p. :
    Number of Pages32
    ID Numbers
    Open LibraryOL13613685M

    Partial Discharge Theory and Applications to Electrical Systems Gabe Paoletti, P.E. Alex Golubev, PhD Division Application Engineer Manager, R&D, Predictive Diagnostics Cutler-Hammer Engineering Services Cutler-Hammer Engineering Services Pennsauken, NJ Minnetonka, MN Abstract - Partial discharge monitoring is an effective. DC Arc Furnace by Sir William Siemens The idea behind the (direct current) DC arc furnace has been around for a very long time. Its use for the bulk melting of metals dates back at least to , when Sir William Siemens used a DC arc furnace with a vertical graphite cathode, with the arc transferred to the melt in contact with a.

      ARC DISCHARGE METHOD FOR CARBON NANOTUBES The principle of this technique is to vaporize carbon in the presence of catalysts (iron, nickel, cobalt, yttrium, boron, gadolinium, and so forth) under reduced atmosphere of inert gas (argon or helium). After the triggering of the arc between two electrodes, a plasma is formed consisting of the. X. Yao, L. Herrera, and J. Wang, "A series DC arc fault detection method and hardware implementation," in the proceedings of IEEE Applied Power Electronics Conference and Exposition (APEC), Long Beach, CA, Mar. ,

    Estimation of Design discharge (Q) (Para S.S.C) Para The estimation of design discharge for waterway shall preferably be based, wherever possible, on procedures evolved from actual hydro meteorological observations of the same or similar catchments.”. Para The design discharge (Q) normally shall be computed flood with a probable recurrence interval of 50 years. Direct current (DC) is the unidirectional flow of an electric electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion electric current flows in a constant direction, distinguishing it from alternating current (AC).


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Characteristics of long vertical DC arc discharges by Don J Latham Download PDF EPUB FB2

Characteristics of long vertical DC arc discharges. [Ogden, Utah]: U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, (OCoLC) Characteristics of long vertical DC arc discharges.

By Don J. Latham and Utah) Intermountain Research Station (Ogden. Abstract. Chiefly tables."July "Cover es bibliographical of access: Internet.

A long arc plasma system with direct current discharge (Long DC arc plasma system) was generated under atmospheric pressure at low supply power in the arc length of mm. The long DC arc plasma system provides large plasma volume and long residence time of 88 by: 4.

Discharge Characteristics book. IAHR Hydraulic Structures Design Manuals 8. Discharge Characteristics. DOI link for Discharge Characteristics. Discharge Characteristics book. IAHR Hydraulic Structures Design Manuals 8. Edited By D.S.

Miller. Edition 1st Author: D.S. Miller. Therefore, the arc voltage of DC arc water plasma can be defined to be the restrike mode [3]. In the restrike mode, arc attachment on the anode firstly appears in the point on the anode which is closest to the cathode.

At this time, the arc voltage reaches the minimum value since the arc length between cathode and anode is the shortest. In this paper, designed based on a low voltage and high current experimental platform about the contact-loss of the pantograph-catenary which was designed in the laboratory, at any time in the changed cycle of catenary-voltage, spread out more precisely analysis about the phenomenon and the characteristics of arc discharge resulted from the Author: Wenzheng Liu, Zhongping Yang, Zhaofeng Gong, Weiliang Wang, Huisheng Yang, Ran Liu.

Modulation of the flow topology through electrical discharges required a preliminary study of the different subsystems. A DC arc discharge generator based on an automotive ignition system was designed and tested. Current and high voltage measurements were used to track the discharge evolu-tion and the resulting energy release.

Electrochemical discharges have all the characteristics of arc discharges. They occur in a very similar voltage range with similar currents and at atmospheric pressure. The question remains as to how these arcs can be initiated.

The power associated with pulsed arc plasmas is around 1 kW, while the one used for DC arc discharge processes reaches 2 kW. At the same time, ablation rates of pulsed and DC discharges are 1 mg/s and 2 mg/s, respectively, thereby maintaining ablation efficiencies within the same order of magnitude in both modes (3–4 g/kWh).

6 6. The electrodes were vaporized by the passage of a DC current (~ A) through the two high-purity graphite separated (~ 1–2 mm) in mbar of Helium atmosphere.

Experimental set up of arc discharge apparatus was shown in Fig. After arc discharging for a period of. DC (Direct Current) Glow Discharge The DC glow discharge has been historically important, both in applications and in studying the properties of the plasma medium.

For studying the glow discharge, the usual configuration is a long glass cylinder with anode. The direct current arc (dc arc): The most basic type of electrical arc is the dc arc. The dc arc is fed by a source having a total available voltage of between and V and a power of some kW.

A resistor or some other stabilizing device must be used in the circuit of the dc arc to compensate for the negative voltage-current characteristics. Discharge Characteristics: IAHR Hydraulic Structures Design Manuals 8 (IAHR Design Manual) 1st Edition by D.S.

Miller (Editor) out of 5 stars 1 rating. ISBN ISBN Why is ISBN important. ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book. 4/4(1). In this work, an experiment investigation of a Pulsed Arc Electrohydraulic Discharge characteristics and plasma parameter were conducted.

The system consisted of a spark-gap-type power supply (kJ) and a 3L stainless steel reactor with eccentrically configured rod-to-rod electrodes, the water gap distance was fixed at mm. From these reasons, a discharge that can be generated at atmospheric pressure and does not arc is required.

With DC, to prevent arc discharge, a resister is usually inserted between the DC power source and the metal-to-metal electrode to reduce current flow. With AC, dielectric materials are used between metal electrodes to limit current : Douyan Wang, Takao Namihira. Either running straight or with a side-to-side motion, the arc needs to be maintained on the leading edge of the puddle.

In the vertical position, is run uphill. required better rod control but does provide the strongest weld for heavy stress situations and also the smoothest weld for ornamental type products.

Welding rods are available in different amounts, and it's a good idea to. Effect of arc behaviour on the temperature fluctuation of carbon electrode in DC arc discharge To cite this article: F Liang et al J.

Phys.: Conf. Ser. View the article online for updates and enhancements. Related content Investigation of the relationship between arc-anode attachment mode and anode temperature for nickel Cited by: 4.

This video shows how the location of the arc-discharges evolve during the lifetime of the specimen The test lasted 4h 43' at kV 50Hz Pictures were. curring arc discharge, on the order of km long, known to be an effective ignition source for wildland fires.

The arc is initiated by a lightning return stroke spark dis. DC partial discharge characteristics for corona, surface and void discharges Abstract: Measurement of partial discharges (PDs) current pulses is found to be one of the most efficient methods to evaluate the high voltage electrical equipment insulation by: 6.

@article{osti_, title = {Quantitative characterization of arc discharge as vacuum interface}, author = {Huang, S. and Zhu, K. and Lu, Y. R. and Wang, S. Z. and Hershcovitch, A. and Yang, L. and Zhang, X. Y.}, abstractNote = {An arc discharge with channel diameters of 3 mm and 6 mm and lengths between 30mm and 60mm was experimentally investigated for its potential to function as plasma Author: Huang, S.PERFORMANCE CHARACTERISTICS OF HBC-FOILS BY KeV H- have used the Controlled DC Arc-D ischarge (CDAD) rod of 15 mm diameter and 30 mm long.

The carbon discharge arc-evaporation source.Arc discharges can be made in short or long pulses, or operated continuously (DC) if the arc power supply has the capability of supplying high current at voltages exceeding the arc burning voltage.

At the initial, transient phase of an arc discharge, the voltage between the electrodes is much higher than theCited by: