The implementation of a new three phase travelling wave program is discussed. The unique feature of this program is the use of Thevenin equivalent circuit for representation of line terminal conditions. This allows th...
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The implementation of a new three phase travelling wave program is discussed. The unique feature of this program is the use of Thevenin equivalent circuit for representation of line terminal conditions. This allows the use of linear or non-linear differential equations at any line terminal. A new shorthand matrix notation for balanced matrices is used to solve the terminal differential equation for an inductive termination. Parametric results are presented showing the influence of the transmission line X0/X1 on surge levels and effective line-to-ground surge impedance.
Insulator crossarms for 345-kv EHV transmission line have been developed and tested. They use four solid-core post insulator columns (quadruped type) or two solid-core post insulator columns and two disc insulator str...
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Insulator crossarms for 345-kv EHV transmission line have been developed and tested. They use four solid-core post insulator columns (quadruped type) or two solid-core post insulator columns and two disc insulator strings (Twin-arm type) to form a tetrapod mounted horizontally from the tower. They are characterized by making possible narrower right-of-way, more compact tower dimension, and supporting higher mechanical load.
Tremendous technological strides have been made in recent years in the development of miniaturized microwave components and modules using microstrip transmission lines in combination with both semiconductor and ferrit...
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Tremendous technological strides have been made in recent years in the development of miniaturized microwave components and modules using microstrip transmission lines in combination with both semiconductor and ferrite technology. This technology growth has been spurred by rapidly increasing microwave systems complexity and diversity and the need for lower cost, more reliable, and smaller microwave assemblies. This paper describes the design and performance of various ferrimagnetic components as functional blocks for use in microwave integrated modules. The design and performance of the following components are described as well as their utilization in various multifunction modules: junction circulators both fixed bias and latching including their use as isolators, duplexers, switches, modulators, and other signal processing circuits; ferrimagnetic planar phase shifters; various combinations of these circuit elements where both all ferrimagnetic and composite ferrimagnetic/dielectric substrates are utilized.
Synthesis procedures are presented for commensurate linelength combline and capacitively loaded interdigital filters. A simple modification for using lumped capacitors is given and is found to yield excellent results ...
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Synthesis procedures are presented for commensurate linelength combline and capacitively loaded interdigital filters. A simple modification for using lumped capacitors is given and is found to yield excellent results for any practical bandwidth. The synthesis procedures for both filter types follow directly from the classical bandpass filter design approach using a transformed frequency variable. Two design examples are given to illustrate the design procedures and experimental results are presented for a 40 percent bandwidth combline filter. The problems of network sensitivity, use of network equivalents, and extension to other filter types are also discussed.
The current unbalance in two 113 mile long, electrically parallel, untransposed 500 kV overhead transmission line sections is studied for conditions in which some or all of the series-capacitor compensation is removed...
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The current unbalance in two 113 mile long, electrically parallel, untransposed 500 kV overhead transmission line sections is studied for conditions in which some or all of the series-capacitor compensation is removed from individual circuits. It is shown that a negative sequence current of over 25% of the positive sequence line current can flow for certain phasing arrangements of the conductors and when one circuit is 70% series-capacitor compensated while the other circuit is uncompensated.
This paper presents a technique using the Gauss-Seidel iterative approach for the analysis of power systems which contain series compensated lines. This approach includes the effect of system dissymmetries due to a si...
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This paper presents a technique using the Gauss-Seidel iterative approach for the analysis of power systems which contain series compensated lines. This approach includes the effect of system dissymmetries due to a single unbalanced fault and due to a single or -two phase series capacitor short circuit caused by the excessive fault currents. Single phase to ground, two phases and two phase to ground fault studies of a series compensated power system are included.
This paper discusses the physical meaning and prop-erties of the waves defined by [Equation], [Equation] where V/sub i/, and Z/sub i/, are the voltage at and the current flowing into the ith port of a junction and Z/s...
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This paper discusses the physical meaning and prop-erties of the waves defined by [Equation], [Equation] where V/sub i/, and Z/sub i/, are the voltage at and the current flowing into the ith port of a junction and Z/sub i/, is the impedance of the circuit connected to the ith port. The square of the magnitude of these waves is directly related to the exchangeable power of a source and the reflected power. For this reason, in this paper, they are called the power waves. For certain applications where the power relations are of main concern, the power waves are more suitable quantities than the conventional traveling waves. The lossless and reciprocal conditions as well as the frequency characteristics of the scattering matrix are presented. Then, the formula is given for a new scattering matrix when the Z/sub i/'s are changed. As an application, the condition under which an amplifier can be matched simultaneously at both input and output ports as well as the condition for the network to be unconditionally stable are given in terms of the scattering matrix components. Also a brief comparison is made between the traveling waves and the power waves.
The cooperative lightning laboratories near Alcoa, Tenn., have been in operation since July, 1928. This paper outlines the purpose of the installation and describes the transmission line on which the studies are being...
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A brief discussion of the Darlington pulse-forming network is followed by a theoretical study of the effects of a series inductance at the input terminals and a shunt capacitance at the output terminals on the shape o...
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A brief discussion of the Darlington pulse-forming network is followed by a theoretical study of the effects of a series inductance at the input terminals and a shunt capacitance at the output terminals on the shape of the pulse produced. A group of curves with normalized parameters are presented to illustrate how the rise, peak, and decay of a pulse for an idealized magnetron are affected.
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