Results 311 to 320 of about 262,039 (330)

Current transformer calibration

1988
The practical application of the current comparator to current transformer calibration is accomplished with a configuration that has been called the compensated current comparator. The principal feature of this configuration is a winding located inside the main magnetic shield which has the same number of turns as one of the ratio windings located ...
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Methods for Testing Current Transformers

Transactions of the American Institute of Electrical Engineers, 1924
In the sale of electric power especially in large amounts at high voltages, current transformers are universally used to operate the meters from the readings of which the bills are made out. While the secondary currents of such transformers reproduce fairly faithifully on a smaller scale the conditions of current strength and phase existing in their ...
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Harmonics in transformer magnetizing currents

Proceedings of the American Institute of Electrical Engineers, 1915
The purpose of this paper is to show in a concise manner the cause and effects of higher harmonic currents in magnetizing currents of transformers. A hypothetical case is analyzed to show the cause of the harmonics; then the schemes of connecting transformers that are commonly used for polyphase transformation are taken up and the effects of the ...
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Reviewing current transformers and current transducers

2007 Electrical Insulation Conference and Electrical Manufacturing Expo, 2007
The purpose of this paper is to provide a tutorial review of three types of current transducers that are used in instruments and power. The three current transducers that will be discussed are; (1) the ac current transducer; (2) the dc current saturable reactor; and (3) the Hall effect generator with the rugged solid iron core.
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Current transformers near high-current busses

Electrical Engineering, 1951
WHEN CURRENT TRANSFORMERS are applied in the vicinity of busses carrying large currents, the transformer accuracy may be very seriously affected. This is particularly true on systems which normally carry over 2,000 amperes and may carry 10 or 20 times this current during faults.
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Current Status of Bacterial Transformations

1955
Publisher Summary When it became clear that a number of plant viruses are crystallizable macromolecules composed of ribonucleic acid and protein, it was possible to attribute to a particular sort of macromolecule the striking biological property of autoreproduction.
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Current transformers

1993
C. Christopoulos, A. Wright
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The current transformer

Proceedings of the American Institute of Electrical Engineers, 1906
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Low-Current-Secondary Current Transformers

Transactions of the American Institute of Electrical Engineers, 1946
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The Direct Current Transformer

1961
Among numerous problems of cryogenic engineering there is the one of electrical conduction from an external room temperature source into a low temperature environment. For currents over a few amperes the problem is one of providing electrical conductors of suitable current carrying capacity without introducing excessive thermal conduction.
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