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IEEE Transactions on Industry Applications

Volume 26 Issue 4 • July-Aug. 1990

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Displaying Results 1 - 25 of 31
  • Discussion of "1987 ampacity tables-demystifying the myths" (and reply)

    Publication Year: 1990
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    J. Nasilowski observes that the above-titled paper (see ibid., vol.25, no.5, p.910-17, (1989)) shows clearly why electrical engineers do not calculate the ampacity of conductors (a very complicated job with uncertain results), preferring current heating tests with certain results. He points out that it is possible to derive from Newton's heat dissipation law a new thermokinetic coefficient for the... View full abstract»

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  • Studies on electrostatic surface discharges on corona-charged polymer surfaces

    Publication Year: 1990, Page(s):656 - 661
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Electrostatic surface discharge phenomena on corona-charged thin polymer films such as FEP or PTFE Teflon, with surface potentials from 1 to 5 kV in both polarities, were studied. A grounded sphere electrode, 5 mm in diameter, approached the charged surface by a computer-controlled step motor until the surface discharge occurred. Discharge-current waveforms, with a very short risetime (a few nanos... View full abstract»

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  • Reduction of CO2 from combustion gases by DC corona torches

    Publication Year: 1990, Page(s):651 - 655
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    An experimental investigation has been conducted to reduce CO2 from combustion gases by using DC corona torches. This plasma device, the corona torch, consists of two small-diameter hollow electrodes. The gas flow enters the upstream cylindrical hollow electrode and exits at a downstream cylindrical hollow electrode. Therefore, all the reactive gas passes through the active corona-induc... View full abstract»

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  • Transient charge decay in lined vessels and silos

    Publication Year: 1990, Page(s):646 - 650
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A simple model for the transient charge decay dynamics in lined vessels is presented. A simple canonical form is revealed for the extrinsic circuit time constant which can be used to estimate the time required for the decay of the charge accumulated on the liner. In addition, methods of calculating the time-dependent potential drop and capacitive energy per unit area of a vessel liner are presente... View full abstract»

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  • Evaluation of the cold pipe precharger

    Publication Year: 1990, Page(s):639 - 645
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A model is developed in order to evaluate the cold pipe precharger, which was developed to reduce the resistivity of the dust layer collected on the cold pipe surface and also to achieve very high levels of charge on dust particles in a very short distance along the direction of gas flow. The approach requires detailed descriptions of electrical characteristics, electrohydrodynamics, and charging ... View full abstract»

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  • A novel, compliant, four degree-of-freedom, robotic fingertip sensor

    Publication Year: 1990, Page(s):613 - 619
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A novel, low-cost, compliant fingertip sensor for robotic gripper applications is presented. The fingertip sensor is intended for use in grippers where force feedback information is needed, such as in clean room or space applications where telerobotic operation is desired. The fingertip is approximately the size of the thumb of an adult male and is approximately as compliant as human flesh. The se... View full abstract»

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  • A case study on the selection of performance index for design optimization of new controllers

    Publication Year: 1990, Page(s):632 - 638
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Designs are typically judged subjectively rather than by analytical techniques in which the engineer is trained. To alleviate this problem, the concept of the merit index is introduced to quantify the way in which new designs are measured. This analytical technique is used in selecting the optimal design. The merit index is a unit measure that is a function of the design adequacy, producibility, c... View full abstract»

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  • High-voltage testing of medium-voltage shielded power cables

    Publication Year: 1990, Page(s):606 - 612
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    Medium-voltage power cables rated 2001-35000 V are tested using both 60 Hz AC voltage and DC voltage before leaving the cable manufacturing plant. Shielded medium-voltage cables are also required to meet the corona extinction level voltage established. These shielded cables are to be free of partial discharge at voltages well above operating voltages. In addition to these factory tests, the user n... View full abstract»

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  • Simulated space radiation effects on power MOSFETs in switching power supplies

    Publication Year: 1990, Page(s):798 - 802
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Application of power MOSFETs in spaceborne power converters was simulated by exposing switched devices to low-dose-rate ionizing radiation. Both radiation-hardened and nonradiation-hardened devices were tested. The results were compared to those obtained at higher dose rates and with constant gate bias. The primary effects of ionizing radiation on power MOSFETs are changes in the threshold voltage... View full abstract»

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  • Transformers as equivalent circuits for switches: general proofs and D-Q transformation-based analyses

    Publication Year: 1990, Page(s):777 - 785
    Cited by:  Papers (97)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    The equivalent circuits for the switches in DC-DC, DC-AC, AC-DC, and AC-AC converters are proved to be time-varying transformers. This result is used in the analyses of DC-DC converters, an eight-order current source rectifier-inverter, and a buck-boost inverter. The circuit D-Q transformation is proposed for the analyses of the AC converters such as inverters, rectifiers, and cy... View full abstract»

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  • How long should power system disturbance site monitoring be to be significant?

    Publication Year: 1990, Page(s):705 - 710
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The results of a statistical study of the power supply disturbances that occurred at a computer site over a period of two years are presented. The primary objectives were to attempt to determine how long power system disturbance site monitoring should be to be significant and to reveal the importance of having a sound knowledge of the possible patterns of occurrence of power supply disturbances at... View full abstract»

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  • Maintaining optimum light output with a thermally conductive heat pipe

    Publication Year: 1990, Page(s):627 - 631
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Current research in the area of lamp wall temperature control for the purpose of enhancing light output under elevated temperatures is described. More specifically, a thermally conductive heat pipe has been employed to maintain optimum lamp wall temperature under varied ambient temperatures. The advantages of a heat pipe over previous methods of enhancing light output include its independence from... View full abstract»

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  • A knowledge-based expert system for managing underground coal mines in the US

    Publication Year: 1990, Page(s):598 - 604
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The Mine Management Support System which is being developed as a knowledge-based expert system for better management of underground coal mines, is presented. Concentrating on capturing the complex body of knowledge needed to enhance efficient management of a mine, it will encompass information and preferred rules on work scheduling, work practices, regulations impinging on the accomplishment of wo... View full abstract»

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  • Optimization of power MOSFET body diode for speed and ruggedness

    Publication Year: 1990, Page(s):793 - 797
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The built-in diode in the power MOSFET can be used as an integral flyback diode in a power electronics circuit. However, if the power MOSFET is not optimized for utilization of the built-in diode, it can catastrophically fail during the diode mode of operation. A failure mechanism is proposed and discussed. It is found that through improved design with optimized cell geometry, vertical device stru... View full abstract»

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  • A survey of neutral currents in three-phase computer power systems

    Publication Year: 1990, Page(s):719 - 725
    Cited by:  Papers (135)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    It is shown that the magnitude of the neutral current in three-phase computer power systems depends on the harmonic content and phase balance of the load currents. While very high neutral currents are possible due to the additive nature of triplen harmonic currents, a low percentage of data processing sites in the United States are actually experiencing neutral currents in excess of the rated phas... View full abstract»

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  • A power factor compensator using a force-commutated cycloconverter

    Publication Year: 1990, Page(s):769 - 776
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The unique power factor compensator proposed uses a force-commutated cycloconverter (FCC), which constantly keeps the displacement factor of the AC system at unity regardless of the load power factor. No energy storage elements and no feedback controls are required basically in this system. An FCC with half of the load capacity can achieve a fast and complete compensation of the reactive power in ... View full abstract»

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  • Case study of radial overhead feeder performance at 12.5 and 34.5 kV

    Publication Year: 1990, Page(s):696 - 704
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The electric performance and the economics of four supply options for a specific 12.5 kV radial distribution feeder were examined. Options included upgrading to 34.5 kV and/or sectionalizing. Feeder losses, voltage regulation, and system voltage dips due to feeder faults were analyzed. It was found that distribution transformer losses were a significant component in the total feeder loss and an im... View full abstract»

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  • Reliability survey of 600 to 1800 kW diesel and gas-turbine generating units

    Publication Year: 1990, Page(s):741 - 755
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1128 KB)

    A study of the reliability, availability, and maintainability (RAM) characteristics of diesel and gas-turbine power systems producing less than 2 MW is discussed. The study included collection and examination of source data for power systems at commercial and military facilities operating in continuous or standby service. A database of system, subsystem, and component RAM data was established. The... View full abstract»

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  • Wyes and wye nots of three-phase distribution transformer connections

    Publication Year: 1990, Page(s):683 - 688
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The advantages and disadvantages of various three-phase transformer connections are summarized. Recommendations are provided regarding the standard types of connections a utility should offer for various service requirements. Warehousing costs, ferroresonance, neutral grounding, core construction, overvoltages, unbalanced loading, zero sequence source, and through faults are considered. Emphasis i... View full abstract»

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  • Donor cell-finite element descriptions of wire-duct precipitator fields, charges, and efficiencies

    Publication Year: 1990, Page(s):662 - 670
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Computations of electric field and charge density structures and resultant efficiencies in wire-duct electrostatic precipitators are described. The computational method is based upon the finite-element method as a means for computing the potential and electric field for a known charge distribution and a donor cell method that imposes conservation of charge in integral form as a means for computing... View full abstract»

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  • Power quality and factory automation

    Publication Year: 1990, Page(s):620 - 626
    Cited by:  Papers (57)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    A case study involving monitoring power quality disturbances at a representative plant and identifying the disturbances that disrupt production is described. The sensitivities of representative electronic control equipment to the identified disturbances were measured and then projected to form a plant disturbance threshold. For the monitoring effort, six disturbance analyzers were installed at fou... View full abstract»

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  • The electrical design and considerations for a ladle metallurgy facility

    Publication Year: 1990, Page(s):593 - 597
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A general description is given of a ladle metallurgy facility for a secondary liquid steel refining process. This process occurs after the steel is produced from iron in a basic oxygen furnace (BOF) and before the hot liquid steel is cast into slabs for further processing. Ladle metallurgy processes improve the steel quality and temperature control as demanded by a high-quality continuous caster. ... View full abstract»

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  • The transistor behavior in a circuit with a shorted load

    Publication Year: 1990, Page(s):803 - 808
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    If a transistor is working in a circuit with a shorted load, two different cases have to be distinguished. Case 1 is when a transistor is switched on in a circuit with a shorted load. This case was treated in the past. A second case that has to be considered is when a short occurs during the on state of the transistor. The results of one-dimensional simulations for case 2 show that collector-emitt... View full abstract»

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  • Design optimization of permanent magnet DC motors

    Publication Year: 1990, Page(s):786 - 792
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A mathematical model suitable for the design optimization of permanent magnetic (PM) DC motors is presented. The model, which combines the motor electric, magnetic, and physical quantities, takes the armature reaction effects, brush drop characteristics, and magnetic saturation of the iron parts into account. A method for transformation of variables which makes the model applicable to a wide range... View full abstract»

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  • Effects of momentary voltage dips on the operation of induction and synchronous motors

    Publication Year: 1990, Page(s):711 - 718
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    Simplified stability calculations of induction and synchronous motors on voltage dips are presented. The voltage dip withstand characteristics of induction and synchronous motors rated at the same horsepower and driving the same inertial loads are calculated. The motor characteristics influencing stability are: the type of motor selected (synchronous or induction); the pull-out torque of synchrono... View full abstract»

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Aims & Scope

The scope of the IEEE Transactions on Industry Applications includes all scope items of the IEEE Industry Applications Society, that is, the advancement of the theory and practice of electrical and electronic engineering in the development, design, manufacture, and application of electrical systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; industry leadership in energy conservation and environmental, health, and safety issues; the creation of voluntary engineering standards and recommended practices; and the professional development of its membership.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Thomas A. Nondahl
t.nondahl@ieee.org