Results 121 to 130 of about 2,082 (162)

Gauge transformations with fractional winding numbers

Physical Review D, 1996
The role which gauge transformations of noninteger winding numbers might play in non-Abelian gauge theories is studied. The phase factor acquired by the semiclassical physical states in an arbitrary background gauge field when they undergo a gauge transformation of an arbitrary real winding number is calculated in the path integral formalism assuming ...
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Separate leakage reactance of transformer windings

Journal of the A.I.E.E., 1925
The paper discusses a method for determining the separate leakage reactances of transformer windings, originally suggested in 1921 by W. V. Lyon.2 The method is applicable only to three-phase banks of three identical transformers, and makes use of the third harmonic electromotive force and current which are introduced into the windings by the inherent ...
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Winding Transform Matrices

1989
The main purpose of the magnetic equivalent circuit method is to relate phase fluxes to phase currents of an electric machine in a way that will as best as possible reflect all peculiarities of a device. Node potential equations that were derived in the previous chapter helped establish connections between magnetic scalar potentials in a machine and ...
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Surge Characteristics of Two-Winding Transformers

Transactions of the American Institute of Electrical Engineers, 1941
THE object of this paper is to show the performance of transformers with two windings in the rapid-transient state when surges develop in their conductors. On the one hand, we will determine the characteristic constants for traveling waves, as surge-impedance and wave velocity, from the data of the transformer.
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Determination of temperatures in transformer windings

IEEE Transactions on Power Apparatus and Systems, 1975
Measurements made immediately after shut-down of a transformer short-circuit temperature rise test contain information relating to winding temperatures and winding oil temperatures. These quantities cannot be measured directly in any practicable manner.
A. Rele, S. Palmer
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Effect of Surges on Transformer Windings

Transactions of the American Institute of Electrical Engineers, 1930
A study has been made of the reaction of transformer windings in grounded neutral systems when subjected to transient voltage surges such as exist on normally insulated lines. Measurements of the voltage distribution throughout the windings between various elements and to ground were effected by means of a cold cathode type cathode ray oscillograph and
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Are transformer stabilizing windings necessary?

Electrical Engineering, 1959
FOR MANY YEARS it has been common practice to include a Δ-connected stabilizing winding in Y-Y-connected transformers and Y-connected autotrans-formers. This applies to 3-phase units of all types of core construction as well as 3-phase banks of single-phase units. The practice has been followed so closely for such a long time that it is generally taken
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Superconductive windings in power transformers

Journal of the Institution of Electrical Engineers, 1963
The superconducting elements exclude all magnetic field from their bulk and restrict conduction within a few hundred angstroms of their surface, but there are alloys in which d.c. superconduction occurs in depth. The paper examines the electromagnetic behaviour of both these forms of superconductor, and includes a description of the loss mechanism in ...
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Graded windings for pulse transformers

Proceedings of the IEE Part C: Monographs, 1962
The paper provides a comparison of conventional with graded windings used in pulse-transformer design. A conventional winding is defined as one in which the interlayer dielectric thickness is constant over the winding length, while the graded winding is defined as one in which the interlayer dielectric thickness varies linearly over the winding length.
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Frequency Characteristics of Transformer Windings

2013
Transformers are subjected to voltages and currents of various waveforms while in service or during insulation tests. They could be system voltages, ferroresonance, and harmonics at low frequencies, lightning or switching impulses at high frequencies, and corona/partial discharges at ultra-high frequencies (a brief explanation is given at the end of ...
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