Results 111 to 120 of about 40,759 (164)
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Transformer magnetizing inrush currents
Electrical Engineering, 1951THERE ARE formulas available by which it is possible to calculate the peak of the first cycle of magnetizing inrush current for a transformer. There have been no convenient formulas available for determining the maximum values of successive cycles of current.
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A Milliampere Current Transformer
Transactions of the American Institute of Electrical Engineers, 1914(1) It is pointed out that by the use of a current transformer having a primary to secondary current ratio of the order of 1 to 100, oscillograms can be obtained of the charging current of a single high-tension insulator or of a few feet of high-tension transmission line; that is, oscillograms of currents of the order of 0.1 to 0.5 milliampere may be ...
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IEEE Transactions on Power Delivery, 2007
This paper presents a current-transformer (CT) model that is useful for low-frequency applications. To describe the iron-core magnetic behavior, a hysteresis model is proposed, which is able to generate minor asymmetric loops and remanent flux. The effects of classic eddy current losses and anomalous losses are represented by linear and nonlinear ...
Francisco das Chagas Fernandes Guerra +1 more
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This paper presents a current-transformer (CT) model that is useful for low-frequency applications. To describe the iron-core magnetic behavior, a hysteresis model is proposed, which is able to generate minor asymmetric loops and remanent flux. The effects of classic eddy current losses and anomalous losses are represented by linear and nonlinear ...
Francisco das Chagas Fernandes Guerra +1 more
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Current summations with current transformers
Journal of the Institution of Electrical Engineers, 1955The behaviour of current transformers in parallel, and of similar circuits employing summation transformers, is studied for different conditions of load distribution.After the existing theory concerning idle currents has been rejected it is demonstrated that the overall error is very nearly constant for a given total load, no matter how the current may
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IEEE Transactions on Power Apparatus and Systems, 1967
Rapid growth of power systems places increased emphasis upon the quick procurement and safe delivery of high- voltage apparatus. To satisfy this need, a new oil-filled, high-voltage current transformer, which could be referred to as a modified version of an inverted eyebolt construction, has been developed.
Louis Marks, Philip Shade
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Rapid growth of power systems places increased emphasis upon the quick procurement and safe delivery of high- voltage apparatus. To satisfy this need, a new oil-filled, high-voltage current transformer, which could be referred to as a modified version of an inverted eyebolt construction, has been developed.
Louis Marks, Philip Shade
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IEEE Industry Applications Magazine, 2010
This article presents the harmonic analysis of transformer inrush currents in offshore power systems. Offshore production facilities interconnected by subsea cables are becoming increasingly common, either as new projects or as extensions to existing facilities. Interconnection via a subsea cable introduces a significant shunt capacitance to the source
Ryan Turner, Kenneth Smith
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This article presents the harmonic analysis of transformer inrush currents in offshore power systems. Offshore production facilities interconnected by subsea cables are becoming increasingly common, either as new projects or as extensions to existing facilities. Interconnection via a subsea cable introduces a significant shunt capacitance to the source
Ryan Turner, Kenneth Smith
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Multiband current transformers
Russian Electrical Engineering, 2009The design and principle of action of the new multiband transformer of a current is considered in which the expansion of the top range of measurements is carried out by creation against a magnet driving force in the closed core.
S. F. Amirov +2 more
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Magnetooptical current transformer 2: Components
Applied Optics, 1980In this second part, the most important components of a magnetooptical current transformer are described and their suitability is discussed. Today He-Ne gas lasers and laser diodes seem to meet best the requirements of the light source. Single-mode optical fibers are capable of transmitting polarized light without depolarization.
H, Aulich +5 more
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Protective Current Transformers
Nature, 1956Protective Current Transformers and Circuits By P. Mathews. (Advanced Engineering Textbooks.) Pp. xv + 253 + 4 plates. (London: Chapman and Hall, Ltd., 1955.) 36s. net.
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Surge protectors for current transformers
Electrical Engineering, 1936Surge protection and open-circuit protection of current transformers may be obtained by the application of shunts in which the material known as ``thyrite,'' and which has a negative resistance characteristic, is used. The surge protector is connected across the current transformer primary, and the open-circuit protector across the secondary.
G. Camilli, L. V. Bewley
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