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Power Apparatus and Systems, IEEE Transactions on

Issue 3 • Date March 1965

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Displaying Results 1 - 15 of 15
  • Telemetering of Ice Loading on a Power Line Conductor

    Page(s): 187 - 191
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    An ice load telemeter station employing unique methods of power supply and measurement has been designed and installed. The completely self-contained installation includes communication circuits, telemetry circuits, control, power supply from a 230-kV power line, and a radio telemeter circuit powered from and installed on an energized 345-kV conductor. View full abstract»

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  • Low-Cost Pole-Mounted VHF Radio Station for Bonneville Power Administration

    Page(s): 191 - 197
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    This paper describes what is believed to be the nation's first completely transistorized pole-mounted 10-watt VHF land mobile radio repeater station powered by a combination rechargeable battery and thermoelectric generator unit. Over 2 years of field experience has been accumulated since this Station was installed December 7, 1962. The Unique power supply, which has been an unqualified success, comprises a 12-watt thermoelectric generator, a thermomotor which diverts the waste heat into the radio equipment cabinet at temperatures below 40°F, and a nickel-cadmium battery supply. View full abstract»

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  • Power Line Carrier Coupling Investigations on a 500-kV Line

    Page(s): 197 - 200
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    Some previously accepted concepts of power line carrier coupling do not apply on power lines with very few transpositions. For such lines, the attenuation and impedance of the carrier circuit may be strongly dependent on which phase conductor is selected for coupling. This phenomenon has been investigated in a series of tests on a long 500-kV line with one transposition near the middle. The results, which are explained in terms of the modal propagation theory, show a difference of as much as 15 dB in attenuation at certain frequencies between the optimum and a more conventional form of carrier coupling. View full abstract»

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  • Propagation on Overhead Transmission Lines I-Theory of Modal Analysis

    Page(s): 200 - 205
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    This paper will investigate the technique of modal analysis applied to propagation of signals on overhead transmission lines. The propagation problem is first analyzed in phase quantities at a constant frequency and then with modal transformations in the original differential equations. From the model analysis, properties of modal transformations are deduced. This analysis shows that when earth correction terms are used in the description of the transmission line, the propagation constant matrix can be used to determine the modal transformations; it is also demonstrated that to evaluate the phase quantity results numerically it is necessary to perform a modal (eigenvalue) transformation. The general equations, evaluated for perfect earth, show that the surge impedance matrix can be used to determine the modal transformations, as has been done by previous authors. View full abstract»

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  • Propagation on Overhead Transmission Lines II-Earth-Conduction Effects and Practical Results

    Page(s): 205 - 211
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    This paper will discuss the magnitude of earth correction terms calculated from available references. It is concluded that Carson's earth correction terms are predominant, and curves detailing the magnitude of these are presented. Examples showing the magnitude of Carson's earth correction terms for a given line at 60 c/s, 50 kc/s, and 1 Mc/s are shown. A modal analysis, using the technique developed in a companion paper, shows the effect of the earth correction terms on the modes of propagation and confirming field test results are given. View full abstract»

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  • A Directional Coupler for Power Line Carrier

    Page(s): 211 - 215
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    A method of coupling with directional characteristics can have two significant advantages in power line carrier work: it will remove the need for wavetraps, and it will expand the communication capacity of the power lines. The disadvantage is that system inefficiencies may require more transmitter power. A simple theory for directional couplers is provided, and the theoretical results are compared with measurements from a model 3-phase transmission circuit. View full abstract»

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  • Bibliography of Carrier, Microwave, and Wire-Line Literature Applicable to Power Systems

    Page(s): 216 - 219
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    This bibliography presents references to significant literature in the field of Power System Communications from 1955 to 1964. The references are classified according to subject matter and listed chronologically. View full abstract»

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  • A Power Swing Relay for Predicting Generation Instability

    Page(s): 219 - 224
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    A transistorized relay recently installed to predict generation instability resulting from major system disturbances is described. The relay can be used to initiate corrective measures, such as generation tripping or dynamic braking, to maintain stability. Several advantages over the present methods of initiating corrective action are obtained by use of this relay. View full abstract»

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  • Calculation of the Ratio and Phase-Angle Errors of Phase-Shifting Autotransformers

    Page(s): 224 - 228
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    The determination of the ratio and phase-angle errors of a phase-shifting transformer is quite difficult without special test equipment of adequate sensitivity and precision. Although formulas for the calculation of these errors in two winding potential transformers are available, they cannot easily be applied to the interconnected autotransformers used for phase shifting. This paper demonstrates a method for calculation of these errors by the application of Thevenin's Theorem. View full abstract»

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  • Closed and Open Design Projects in the Education of Engineers

    Page(s): 228 - 231
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    The two aspects of engineering education are the teaching of science and the teaching of design. By ``design'' is meant the procedure of selecting and combining distinct elements to create complete systems which will perform useful functions. In this paper, the author describes the application of this concept of design teaching at The Technical University of Denmark, after a procedure which includes a sequence of closed and open design projects in both computational and experimental laboratories. View full abstract»

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  • A Statistical Aspect of the Coordination of Two Gaps

    Page(s): 232 - 236
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    Many problems of insulation coordination are concerned with the protection of an air gap by means of another air gap: protection of the external insulation of a bushing by means of a rod gap, protection of line-to-tower insulation by means of the ground hardware of an insulator string, protection of the open gap of a switch by means of the line-to-ground insulation of the stack, etc. When dealing with stresses caused by switching surges, the inherent dispersion of the dielectric characteristics of the air gaps, i.e., the probability of sparkover and the times-to-sparkover, is such that these problems must be approached with statistical methods. Furthermore, since the designer is interested in the probable number of sparkovers per year and not in the absolute probability of sparkover, the number and the distribution of the stresses which the electric system applies to the insulation considered must be taken into account. This paper intends to provide a tool to the designer and to show how it works by applying the suggested method to the coordination of two rod gaps. In the case examined, the necessary quantitative knowledge will be determined by laboratory tests or taken from previous system studies. View full abstract»

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  • Fundamentals for the Determination of EHV Switching-Surge Ratings

    Page(s): 236 - 243
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    This paper develops a theoretical method which leads to an efficient practical one and provides a mathematical basis for establishing EHV switching-surge ratings. Detailed analyses of the major factors involved in EHV testing are presented. Application of statistical and probability mathematics to the test results indicates the necessity of a rigorous evaluation of the test data and the need for defining the environmental differences between laboratories. Statements of rating include references to error factors and the degree of confidence that a particular series of test results have a certain probability of occurrence. View full abstract»

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  • Discussions

    Page(s): 249 - 253
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  • Authors

    Page(s): 254 - 256
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    Freely Available from IEEE

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