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Power Apparatus and Systems, IEEE Transactions on

Issue 5  Part 1 • Date Sept. 1975

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Displaying Results 1 - 25 of 52
  • [Front cover and table of contents]

    Publication Year: 1975 , Page(s): c1
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    Freely Available from IEEE
  • A study of loss-of-excitation relaying and stability of a 595-MVA generator on the Detroit Edison system

    Publication Year: 1975 , Page(s): 1449 - 1456
    Cited by:  Papers (2)
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    This paper describes the investigation and evaluation of relationships between loss-of-excitation/field (LOF) relaying and stability of a 595-MVA generator on the Detroit Edison system. Need for the formulation of a plan of action to promote a reliable application of LOF relays is made evident. Operating guidelines are suggested which will safeguard the generator and system from damage during unstable swings while avoiding inadvertent generator tripping during stable swings. In addition, an examination of operating characteristics of a loss-of-field relay in response to changes in voltage and frequency is presented. View full abstract»

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  • Loss of excitation protection for modern synchronous generators

    Publication Year: 1975 , Page(s): 1457 - 1463
    Cited by:  Papers (20)
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    This paper presents the results of a study into the application and performance of the offset mho distance relay for the loss of excitation protection of synchronous generators. Included is information on the loss of excitation characteristics of modern generators, on relay performance during transient swings and low frequency disturbances and on generator protection. View full abstract»

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  • Loss-of-field relay operation during system disturbances

    Publication Year: 1975 , Page(s): 1464 - 1472
    Cited by:  Papers (4)
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  • The influence of generator loss of excitation on bulk power system reliability

    Publication Year: 1975 , Page(s): 1473 - 1483
    Cited by:  Papers (6)
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    The possibilities of generator damage and/or a cascading system outage due to generator loss of excitation are investigated. Load flow techniques are used to screen large systems for locations where a generator operating without excitation could endanger system reliability. It is shown that automatic protection using relays with up to two zones of protection and having time delays for each zone will reliably guard against the detrimental effects of loss of excitation in the system and synchronous machines. View full abstract»

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  • Power stabilizer design using root locus methods

    Publication Year: 1975 , Page(s): 1484 - 1488
    Cited by:  Papers (15)
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    This paper describes a different approach to the design of power stabilizers for damping out tie-line power oscillations in power systems. The technique described in this paper was successfully applied at a generating station of the Saskatchewan Power Corporation System with the results from these tests included in the latter part of this paper. The technique can be applied directly to systems characterized by lightly damped oscillations and gives an explicit indication of the amount of improvement in system damping for different combinations of power stabilizer parameters. This procedure allows for a graphical approach to the design of power stabilizers and serves as a synthesis procedure when the design constraints are relaxed so that the speed stabilizer is required to provide an improvement in system damping. View full abstract»

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  • Influence of turbulence on the galloping instability of iced conductors

    Publication Year: 1975 , Page(s): 1489 - 1499
    Cited by:  Papers (1)
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    Previously reported wind tunnel dynamic tests on spring-supported models of transmission line conductors with crescent-shaped accumulations of ice, showed that the galloping instability of these models was significantly affected by turbulence in the air flow. The static aerodynamic coefficients of these models have now been determined in turbulent air flow, and a theoretical prediction made of the galloping instability. Good agreement has been obtained between this predicted performance and the previous dynamic tests. The method used for the prediction, and typical experimental data are presented in this paper. View full abstract»

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  • Finite-width, finite-thickness, and saturation effects in solid-rotor induction machines

    Publication Year: 1975 , Page(s): 1500 - 1507
    Cited by:  Papers (6)
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    A theory for the solid-rotor induction machine is developed such that the finite width and thickness of the rotor as well as its saturation are taken into account. An axial-airgap disc-type motor is considered as an example, for which an equivalent circuit is developed, terminal characteristics are computed and compared with experimental results. The validity of the theory is thus demonstrated. Although the disc motor is used as an example, the theory is applicable to single-sided linear induction motors and other solid-rotor eddy-current motors. View full abstract»

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  • A mathematical model for single-stack step motors

    Publication Year: 1975 , Page(s): 1508 - 1517
    Cited by:  Papers (6)
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    First Page of the Article
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  • Ionization, electrode surfaces and discharges in SF6at extra-high-voltages

    Publication Year: 1975 , Page(s): 1518 - 1523
    Cited by:  Papers (17)
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    The influence on DC electrical performance of SF6gas from small protrusions on electrode surfaces has been investigated experimentally in a system of moderate size over the pressure range from 1/2 to 15 atm. abs. The protrusions used were steel or aluminum spheres with 0.079cm radius or a rod 10 times higher than its tip radius of 0.039cm. Over the complete voltage range, 100 kV to 1500 kV, good agreement was found between measured values and those calculated using a simple ionization development model for discharge initiation. This simple model was applied to calculate the effect of other protrusion shapes. In each case when the product of gas pressure times protrusion height above a flat electrode exceeded 80 atm-microns their presence decreased the breakdown stress. Scanning microscope views of the sphere tips after sparking showed microscopic protrusions which account for the deterioration found after the first spark. View full abstract»

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  • Electrostatic effect induction formulae

    Publication Year: 1975 , Page(s): 1524 - 1536
    Cited by:  Papers (14)
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    The calculation of induced voltages and short-circuit currents on people is an important step for the determination of tolerable levels of the electrostatic fields of UHV power transmission lines. Formulae for the induced short-circuit current of a hemisphere and a half-cylinder on the ground are derived in this paper. A shape factor, defined as the ratio of the equivalent charge collecting area, S, to an object's projected area on the ground, is discussed. The short-circuit current, Isc, is obtained from the ground-level voltage gradient, Eg, by means of the equation Isc= J ω ε EgS Different models for predicting the electrostatic induction are compared in the case of a rectangular solid. In order to show how calculations of Iscmay be made for more complicated shapes, a comparison of the results obtained with various approximations is presented. View full abstract»

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  • Optimal generator maintenance scheduling using integer programming

    Publication Year: 1975 , Page(s): 1537 - 1545
    Cited by:  Papers (57)
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    The generator maintenance scheduling problem is formulated as a 0-1 integer linear program. Although previous papers have considered a rigorous integer programming approach intractable, an algorithm of this type is developed which (1) is guaranteed to find a schedule satisfying problem constraints, if one exists; (2) is guaranteed to find the optimal feasible schedules; and (3) will accept any of an important class of optimality criteria, not just levelness of reserve. Particular attention is directed to a new criterion incorporating dollar costs/benefits incurred by delaying or advancing maintenance on a unit. View full abstract»

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  • Engineering education and accreditationߞAn ASEEߞECPD educator dominated system

    Publication Year: 1975 , Page(s): 1546 - 1568
    Cited by:  Papers (1)
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    This paper demonstrates the extent by which a relatively small number of engineering educators have dominated the trend of engineering education and its accreditation system, for many years, from every influencing vantage point. It explores the question of why practicing engineers from industry-the principal user of engineering graduates-do not want to or cannot get themselves involved more effectively in engineering education and accreditation. The paper is based on data garnered by analyzing all ECPD annual reports since 1933, as well as, many major engineering education papers and studies related to this subject. The discussion and conclusions are timely especially in view of the heated debates presently going on regarding graduate engineering accreditation. View full abstract»

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  • Preliminary qualification of a HPOF pipe cable system for service at 765 kv

    Publication Year: 1975 , Page(s): 1569 - 1583
    Cited by:  Papers (11)
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    Tan δ (dissipation factor)data on Cable System B is updated to include the full 2-year 500/550 kV test program at Waltz Mill and the 10-month 765/800 kV extended test program. This data is analyzed, demonstrating no change with time of tan δ for the system. Particular attention is paid to the paper splice, which exhibits a thermoelectric stability limitation at the 765/800 kV level. The outstanding performance of the PP/C splice is emphasized. Consideration of the operation of a very highly stressed oil impregnated paper insulation HPOF pipe system at 765 kV is suggested, including potential single circuit transmission capacity calculations. View full abstract»

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  • The open-circuit magnetic field of a saturated synchronous machine, an experimental and computational study

    Publication Year: 1975 , Page(s): 1584 - 1588
    Cited by:  Papers (2)
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    A comprehensive program for the comparison of computed values of the magnetic fields within electric machines with the actual fields is being developed. The experimental equipment, a fully instrumented synchronous motor, is described together with measurements of the open-circuit radial component of the airgap field. Comparison of the latter with computed values indicates that the predicted values are accurate up to about twice the rated excitation. View full abstract»

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  • Installation and field testing of 138kV SF6 gas insulated station and transmission line

    Publication Year: 1975 , Page(s): 1589 - 1598
    Cited by:  Papers (3)
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    This paper covers installation procedures and testing methods of a 138kV SF6 gas insulated station coupled to 117.5m (385ft) and 367m (1204ft) SF6 gas insulated transmission line exits. Three factors guided American Electric Power Service Corporation in selecting its first SF6 gas insulated station and line exits. These were: available space for expansion of facilities at Indiana & Michigan Electric Company's East Side Station in South Bend, Indiana, aesthetic considerations, and the desire to be involved with this new technology and thus gain needed experience. View full abstract»

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  • Reliability analysis of substations with automatic modelling of switching operations

    Publication Year: 1975 , Page(s): 1599 - 1607
    Cited by:  Papers (6)
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    This paper reviews some of the problems related to the evaluation of substation and switching station reliability and introduces an improved computing method. In particular, it describes a computer program which, from basic data only, classifies all momentary interruptions according to the time of switching required to restore service. The method is based on a Failure Mode and Effect Analysis and is illustrated by the analysis of a practical substation configuration. View full abstract»

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  • Installation of Detroit Edison gas insulated substations

    Publication Year: 1975 , Page(s): 1608 - 1617
    Cited by:  Papers (4)
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    This paper discusses the installation of three Detroit Edison 120kV gas insulated substations - Caniff, Midtown and Cato. These substations, all located in Detroit, were installed between October 1972 and June 1973. Discussion topics include the shipment, foundation, assembly and wiring of metal enclosed components, SF6gas processing and high voltage field testing. View full abstract»

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  • Economy-security functions in power system operationsߞA summary introduction

    Publication Year: 1975 , Page(s): 1618 - 1623
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    This paper presents a brief summary of a Working Group report in which reviews of ten Economy-Security functions appear. View full abstract»

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  • On the suitability of a Gaussian stress distribution for a statistical approach to line insulation design

    Publication Year: 1975 , Page(s): 1624 - 1628
    Cited by:  Papers (1)
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    By using the unconditional probability of flashover as a comparative parameter, it is shown that a Gaussian approximation to the distribution of switching overvoltages is adequate for purposes of transmission line design. View full abstract»

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  • Eigenvalue analysis of synchronous machines

    Publication Year: 1975 , Page(s): 1629 - 1634
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    This paper presents a numerical approach useful for determining the modes of transient response of a synchronous generator. The approach is based upon the Floquet theory of periodic time-variable systems. A computer algorithm for system transition matrix eigenvalue analysis is described and applied to a three-phase synchronous machine. View full abstract»

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  • An optimal tracking approach to load-frequency control

    Publication Year: 1975 , Page(s): 1635 - 1643
    Cited by:  Papers (15)
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    This paper takes the view that the predominant problem of load frequency control (LFC) resides in the low frequency domain assosiated with bulk generation change and which is dominated by limited generation response capability. In this setting LFC is formulated as a tracking problem in which energy source dynamics and load following play a central role. It is shown how load prediction and coordination of area generation in a multi-area interconnection can effectively improve the regulation of inter-area power flows. View full abstract»

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  • A reliability approach to interconnection planning

    Publication Year: 1975 , Page(s): 1644 - 1656
    Cited by:  Papers (5)
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    Probability methods have been used to investigate the effect of the outage of key transmission lines on the reliability of an interconnected power system. The results have been expressed as the probability of loss of import capability due to loss of such key lines. A study technique is developed that relates the reliability of the simultaneous interchange capability (SIC) to a given interconnected system during periods when intercompany transfers are required. Application of the study technique to a typical system demonstrates the sensitivity of the method to various forced outage rates and to the number of days involving heavy transmission loading. View full abstract»

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  • Mechanical effects of high short-circuit currents in substations

    Publication Year: 1975 , Page(s): 1657 - 1665
    Cited by:  Papers (3)
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    Tests have been made of the short-circuit stresses on 145 kV busbar systems with flexible conductors. The influence of different parameters has been studied such as span length, sag, conductor type, conductor spacing, spring effect in towers etc. Currents of 20-50 kArmsand short-circuit times 0,1-0,5 s have been studied. The results have been compared with results from manual and computer calculations. View full abstract»

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  • The measurement of substation ground resistance and its use in determining protection for metallic communication circuits

    Publication Year: 1975 , Page(s): 1666 - 1673
    Cited by:  Papers (2)
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    The increased use of metallic communication circuits in electric substations requires that adequate protection be provided for personnel and equipment during fault conditions. The design of such protection requires a knowledge of the behavior of ground systems, ground rise calculations, and communication techniques. This paper discusses the problem in three parts: I. A development of the characteristics of and measurement techniques for groundbeds and a discussion of how interconnections affect the measurement problem. A new measurement technique is developed which is capable of accurately measuring the resistive part of the grounding impedance of interconnected groundbeds. II. A discussion of the proper use of fault study and ground resistance information for the calculation of ground potential rise. III. A description of the metallic communication circuit protection techniques used by Northern States Power Company. 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