Results 251 to 260 of about 873,587 (299)

Short-circuit current calculations for DC systems

Proceedings of 1994 IEEE Industry Applications Society Annual Meeting, 1996
The aim of the paper is to describe the methods contained in the International Electrotechnical Commission (IEC) draft standard "Calculation of short-circuit currents in DC auxiliary installations in power plants and substations", and to test them using the dynamic computer simulation.
BERIZZI, ALBERTO, S. MASSUCCO, SILVESTRI, ANDREA, ZANINELLI, DARIO   +3 more
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External impedance vs. short-circuit currents

Electrical Engineering, 1934
Effects of external impedance on short-circuit currents in synchronous machines and in networks are discussed in this article. The material presented is not claimed to be new; its chief value lies in the confirmation of calculations by test results, which tends to increase confidence in formulas previously developed.
B. L. Robertson, T. A. Rogers
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Short-circuit current of induction motors and generators

Journal of the American Institute of Electrical Engineers, 1921
There has been a rather prevailing opinion that a sudden short circuit of an induction generator would not cause a serious initial rise in current such as occurs in synchronous generators. This has led to the proposal of the use of such machines as a partial solution of the short-circuit problem on a-c. systems.
R. E. Doherty, E. T. Williamson
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Short-Circuit Currents of Synchronous Machines

Transactions of the American Institute of Electrical Engineers, 1925
The importance of short-circuit forces in large alternators has warranted an investigation of them. The first step in this investigation, which is discussed in this paper, is the calculation of the short-circuit currents that produce them. The method of solution used is that of the assumption of zero resistance and constant flux linkages which has ...
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Short-circuit currents and recovery voltages

Electrical Engineering, 1949
FIELD tests were made on a 7,200/12,470Y-volt multigrounded rural distribution system to check fault current calculations and to investigate transient recovery voltages experienced as a consequence of clearing fault currents. Tests were also made using a miniature circuit representation of a rural distribution system in order to investigate the effect ...
W. H. Eason, I. B. Johnson, J. W. Kalb, H. A. Peterson   +3 more
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Effects of short-circuit currents

2005
Calculation methods for the thermal and electromagnetic effects of short-circuit currents are dealt with IEC 61660-2, which is applicable to short-circuit currents in d.c. auxiliary installations in power plants and substations and IEC 60865-1, related to three-phase a.c. systems.
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The short-circuited fluxgate output current

Journal of Physics E: Scientific Instruments, 1989
The alternative coupling of short-circuiting the secondary coil of a fluxgate sensor by connecting it to the inverting input of a current amplifier is shown to have significant advantages over the more conventional unloaded or second-harmonic tuned voltage coupling.
F Primdahl, J R Petersen, C Olin, K Harbo Andersen   +3 more
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Calculation of short-circuit currents

2011
The current that flows through an element of a power system is a parameter that can be used to detect faults, given the large increase in current flow when a short-circuit occurs. For this reason, a review of the concepts and procedures for calculating fault currents will be made in this chapter, together with some calculations illustrating the methods
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Limitation of short-circuit currents

2005
The expansion of electrical power systems by new power stations and new lines (overhead transmission lines and cable circuits) results in an increase of short-circuit currents due to an increase in sources feeding the short-circuit and due to a reduction of system impedance. The improvement of existing installations and the replacement of equipment are
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Effects of biguanides on short-circuit current in frog skin

American Journal of Physiology-Renal Physiology, 1984
The addition of phenformin to the solution bathing the mucosal side of frog skin resulted in a sustained stimulation of short-circuit current accompanied by an increase in open-circuit potential and total conductance of the membrane. The flux of 22Na from the mucosal to the serosal side of the skin was increased by phenformin, whereas no significant ...
T, Saito, S, Yoshida
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