IEEE Transactions on Power Apparatus and Systems

Issue 5  Part 1 • Sept. 1977

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Displaying Results 1 - 25 of 32
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): c1
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    Freely Available from IEEE
  • Reliability evaluation of the auxiliary electrical systems of power stations

    Publication Year: 1977, Page(s):1441 - 1449
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    This paper presents a novel approach to the reliability assessment of different designs of power station auxiliary electrical systems. This assessment evaluates the impact of the auxiliary system on the availability of the unit in terms of derated states of the unit. This technique permits the reliability cost to be calculated easily for different system designs. All realistic failure modes were t... View full abstract»

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  • Sparsity in diakoptic algorithms

    Publication Year: 1977, Page(s):1450 - 1459
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Algorithms for network analysis by tearing are studied by determining their orders of computational complexity and comparing it to the computational complexity of the solution of the untorn network. Results indicate that sparsity exploitation is essential. Diakoptic algorithms that exploit sparsity partially are shown to be very restrictive. A classical diakoptic approach that exploits sparsity fu... View full abstract»

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  • Area automatic generation control by multi-pass dynamic programming

    Publication Year: 1977, Page(s):1460 - 1469
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Current research in Automatic Generation Control emphasizes coordination of the regulation and the economic dispatch functions into a single systems problem. A dynamic optimal control problem formulation has previously been suggested. In this paper optimal trajectories are found for up to five maneuverable generators, using a new multi-pass dynamic programming method to make such solutions feasibl... View full abstract»

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  • Some critical aspects of generator capability under unbalanced operating conditions

    Publication Year: 1977, Page(s):1470 - 1479
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The transient negative sequence rating of a generator is discussed and I22t is concluded to be inadequate for rating the generator imbalance capability. The possible fault asymmetry, the excitation system and the duration of the fault should also be considered when rating a generator. Measurements of rotor heating during controlled tests on a large generator are discussed, an... View full abstract»

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  • Evaluate distribution system design by cost reliability indices

    Publication Year: 1977, Page(s):1480 - 1490
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Reliability indices for comparing distribution system performance are defined. The effects of manual and automatic sectionalizing schemes on system reliability indices are examined. A cost reliability index and a cost effectiveness ratio are developed for evaluation distribution system design. An example of applying cost reliability index concept for selecting a preferred design is included. View full abstract»

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  • The insulation of ultra-high-voltage in coaxial systems using compressed SF6gas

    Publication Year: 1977, Page(s):1491 - 1497
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    The DC voltage insulating performance of compressed SF6gas at multimegavolt levels was studied in a metal-clad test facility containing large, 760 mm dia., horizontal coaxial electrodes. Seven different coaxial systems which employed cast epoxy post-type spacers for supports were investigated at gas pressures from 1 to 7.8 atm absolute. Discharge voltages in SF6ranged from 50... View full abstract»

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  • Fast generator protection against internal asymmetrical faults

    Publication Year: 1977, Page(s):1498 - 1506
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1624 KB)

    An on-line digital computer technique for the protection of a generator against internal asymmetrical faults is described in this paper. The proposed technique relies on the detection of a second harmonic component in the field current at the onset of a fault in the armature winding. Discrimination against external faults is achieved by monitoring the direction of the negative sequence power flow ... View full abstract»

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  • UHV transmission line electric field reduction with a set of horizontal wires

    Publication Year: 1977, Page(s):1507 - 1516
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1992 KB)

    A method to reduce the electric field using grids of parallel wires under transmission lines is described. The "shielding efficiency" of the grids is defined. Simplified dimensionless curves are presented relating shield grid wires, shielding efficiency, wire radius, wire height, and wiring spacing. An approximate formula is presented for edge effect performance. The approximate formulae agree wit... View full abstract»

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  • Currents induced in the human body by high voltage transmission line electric fieldߞMeasurement and calculation of distribution and dose

    Publication Year: 1977, Page(s):1517 - 1527
    Cited by:  Papers (73)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1992 KB)

    Electric field measurement provides a basis for calculating the induced human body currents. Distributed body current calculation procedures are presented for an erect human on the ground and on a tower leg in a working position. An electric field dosimeter measurement provided a basis for calculating the time integral of induced body currents. Practical measurements show a much lower electric fie... View full abstract»

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  • Expansion planning of radial subtransmission systems

    Publication Year: 1977, Page(s):1528 - 1534
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A unique method is proposed in this paper for the expansion planning of radial subtransmission systems, the integral part of the rural electrical power system. The method determines where capacity shortages and excessive voltage drops exist and, most importantly, what additional new circuits or increases in existing circuits should be considered to relieve the problem, using as input the existing ... View full abstract»

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  • Design of the mica hydroelectric projectߞA major 500 kV SF6installation

    Publication Year: 1977, Page(s):1535 - 1545
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2696 KB)

    The Mica hydroelectric project on the B. C. Hydro system is a six unit 2600 MW underground powerplant designed for unattended operation. The paper describes the basic design of the electrical features of the project including the main and station service single lines and the protection and control methods adopted. Special emphasis is placed on the power equipment aspects and the extensive use of a... View full abstract»

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  • Theoretical description of the current interruption in hv gas blast breakers

    Publication Year: 1977, Page(s):1546 - 1555
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A theoretical model is derived Which is able to describe the current interruption in hv gas blast circuit breakers. The model is based on experimental observations of the relevant physical phenomena. The guidelines for establishing the equations were to describe these relevant effects according to present knowledge as good as possible and to keep the model as simple as possible. Two constants desc... View full abstract»

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  • Out of step relaying for generators working group report

    Publication Year: 1977, Page(s):1556 - 1564
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    This paper discusses the need for the methods of accomplishing out-of-step protection of generators. The report describes the loss-of-synchronism impedance characteristics of large generators in a modern EHV system. It is demonstrated that conventional out-of-step relaying schemes as applied to transmission lines can also be used to detect the out-of-step condition at the generator. View full abstract»

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  • First benchmark model for computer simulation of subsynchronous resonance

    Publication Year: 1977, Page(s):1565 - 1572
    Cited by:  Papers (243)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A benchmark model for the study of subsynchronous resonance is presented along with two test problems for use in computer program comparison and development. Models were developed with the minimum sophistication needed to obtain useful results and with due regard to the kinds of machine characteristics generally obtainable. The machine and circuit parameters are real values taken from the Navajo P... View full abstract»

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  • New modified polyethylene paper proposed for UHV cable insulation

    Publication Year: 1977, Page(s):1573 - 1582
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    Polyethylene is the most popular and excellent material for electrical insulation. But on account of its poor resistance to oil, polyethylene is considered not suitable for the insulation of oil filled cable. We succeeded in developing a new modified polyethylene paper (FHCP), which has an extremely improved compatibility with oil, while retaining its excellent properties. This new paper will have... View full abstract»

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  • Impulse testing of distribution transformers under load

    Publication Year: 1977, Page(s):1583 - 1595
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1424 KB)

    The paper describes a new functional test procedure for evaluating the impulse strength of distribution transformers under service-related conditions, including rated voltage, different current levels, and the effect of precipitation. The test procedure was applied to a representative sample of 54 commercial distribution transformers having a 15kV class insulation system. Specimen transformers use... View full abstract»

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  • Gas Bubbles In Distribution Transformers

    Publication Year: 1977, Page(s):1596 - 1601
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1552 KB)

    Gas bubbles are known to have a deleterious effect on the dielectric strength of transformer oil. The possibility that such bubbles may develop in oil-filled distribution transformers and may cause excessive failure rates is thus of concern to both manufacturer and user. The paper presents new information relative to failure mechanisms in transformers. It describes some of the operating conditions... View full abstract»

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  • Standardized electrical auxiliary system for snupps

    Publication Year: 1977, Page(s):1602 - 1607
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Standardization of the design has been a prime objective for the five SNUPPS PWR nuclear units. Described is the approach taken to achieve this objective in the electrical auxiliary system even considering unique site characteristics for each unit. Also identified are portions of the system which could not be standardized. The result is a successful single design for the nuclear power plant electr... View full abstract»

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  • How to improve system stability without risking subsynchronous resonance

    Publication Year: 1977, Page(s):1608 - 1619
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Various static devices for raising the stability limit of a power system are examined with respect to their employment at or near the electrical center of a two-machine system. Among these devices are series capacitors, shunt capacitors, combined series and shunt capacitors, and shunt static reactive compensators consisting of a fixed capacitor and a variable reactor. New concepts of current gain,... View full abstract»

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  • A new circuit for synthetic autoreclosing test duties under short circuit conditions on high-power circuit-breakers

    Publication Year: 1977, Page(s):1620 - 1630
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2176 KB)

    The need of fully proving high voltage and high power circuit breakers is brought into evidence; to achieve this objective suitable synthetic circuits have to be provided which not only can correctly simulate the breaking operations but also the making operation under short circuit, autoreclosing. Two new synthetic making circuits which can easily be combined with the existing widely known synthet... View full abstract»

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  • Harmonics on the dc side in HVDC conversion

    Publication Year: 1977, Page(s):1631 - 1638
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Unbalance in the operation of HVDC CONVERSION gives rise to uncharacteristic harmonics. This study is presented to show the causes and effects of the harmonics on the dc side. View full abstract»

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  • Through-fault capability requirements for unit auxiliary transformers

    Publication Year: 1977, Page(s):1639 - 1647
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The magnitude and duration of short circuit currents for faults on the low sides of unit auxiliary transformers (UATS) are calculated taking into account the generators' initial loadings, time constants, and saturation. The stresses imposed on UATS by these currents are compared with the short circuit withstand capabilities provided by present standards. In many cases it is found that the standard... View full abstract»

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  • A proposed functional life test model for power transformers

    Publication Year: 1977, Page(s):1648 - 1656
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1416 KB)

    A functional life test model is proposed which can represent the configurations, materials, and service stresses experienced in the windings of power transformers of any rating. The model is a practical size which would permit testing of multiple sets of units at reasonable cost. A unique pattern of winding connections minimizes the demands placed on test power supplies. Steps in a functional life... View full abstract»

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  • Longitudinal load analysis of transmission line systems

    Publication Year: 1977, Page(s):1657 - 1665
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    A review of an Electric Power Research Institute (EPRI) project to develop design aids for the calculation of longitudinal forces and displacements in transmission line structures caused by broken wire or differential ice disturbances is presented. Emphasis is given to results from an equilibrium solution based on a nonlinear stiffness analysis of the line system in which flexibility of the suppor... View full abstract»

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Aims & Scope

This Transactions ceased production in 1985. The current retitled publication is IEEE Transactions on Energy Conversion and IEEE Transactions on Power Delivery, and IEEE Transactions on Power Systems.

Full Aims & Scope