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Definitions of Voltage Unbalance
IEEE Power Engineering Review, 2001Author Affiliations: Clarkson University, Potsdam, NY; Department of Electrical Engineering, University of Cape Town, South Africa. Abstract: This letter reviews three definitions of voltage unbalance developed by NEMA, IEEE, and the power community, respectively.
P. Pillay, M. Manyage
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2017
Most of the cases of rotor vibration problems come from excessive vibration or resonance due to unbalance. A quick remedy to compensate for it is balancing. Balancing is based on the assumptions of a linear relationship between input (unbalance) and output (vibration), namely, The amplitude of unbalance vibration is proportional to the level of ...
Osami Matsushita +4 more
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Most of the cases of rotor vibration problems come from excessive vibration or resonance due to unbalance. A quick remedy to compensate for it is balancing. Balancing is based on the assumptions of a linear relationship between input (unbalance) and output (vibration), namely, The amplitude of unbalance vibration is proportional to the level of ...
Osami Matsushita +4 more
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Review of Scientific Instruments, 1948
The transmission of unbalanced currents on shielded pair lines can be stopped by a double stub device called an unbalance squelcher. The unbalance squelcher, which is substantially a tandem bridge for unbalanced currents, reflects completely the unbalanced currents yet allows free passage of the balanced currents.
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The transmission of unbalanced currents on shielded pair lines can be stopped by a double stub device called an unbalance squelcher. The unbalance squelcher, which is substantially a tandem bridge for unbalanced currents, reflects completely the unbalanced currents yet allows free passage of the balanced currents.
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Journal of Applied Physiology, 2006
The truth is balance . However the opposite of truth, which is unbalance, may not be a lie. Susan Sontag, US author and critic (1933–xxxx). If balance is truth, homeostasis is its biological expression.
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The truth is balance . However the opposite of truth, which is unbalance, may not be a lie. Susan Sontag, US author and critic (1933–xxxx). If balance is truth, homeostasis is its biological expression.
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The Estimation of Rotor Unbalance
Volume 1B: 16th Biennial Conference on Mechanical Vibration and Noise, 1997Abstract A method is presented to determine the state of unbalance of a rotating machine. The only requirement of the procedure is a good numerical model for the rotor and an approximate model for the bearing behaviour. No assumptions are made concerning the operational mode shape of the rotor and the influence of the supporting ...
A. W. Lees, M. I. Friswell
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Experimental Analysis of Double Unbalances
Transactions of the American Institute of Electrical Engineers, 1935Double unbalances in 3-phase electric power networks may be analyzed experimentally on the network ``calculating board'' by applying the method of symmetrical components 2 such methods of analysis are presented in this paper. Although intended primarily for use with the a-c calculating board, some of the material is applicable to the d-c board and to ...
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Compensation for unbalances at magnetic bearings
1997The aim of this paper is to provide a new method to compensate remaining unbalances at magnetic bearings. The compensating signal will be generated by a MLP-network. The main advantage that this new method presents lies in the simplified manner of operation rather than in a qualitative improvement of disturbance compensation.
Mathias Paul, Wilfried Hofmann
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On the assessment of voltage unbalance
Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010, 2010The management of voltage unbalance in a power system is supported by the knowledge on the contribution of a single unbalanced load/source to the total level of voltage unbalance observed at a Point of Common Coupling (PCC) in an interconnected power system with unbalanced loads distributed all over.
T. E. Seiphetlho, A. P. J. Rens
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2016
The chapter deals with rotor mass unbalance fault. Diagnosis is done both using steady-state signal as well as starting current transients. Concordia is formed using steady-state current and analyzed. The Concordia -based assessment is done using starting current transients.
Subrata Karmakar +3 more
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The chapter deals with rotor mass unbalance fault. Diagnosis is done both using steady-state signal as well as starting current transients. Concordia is formed using steady-state current and analyzed. The Concordia -based assessment is done using starting current transients.
Subrata Karmakar +3 more
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Unbalance effects in modulators
Journal of the British Institution of Radio Engineers, 1955The various groups of output frequency-components which can be produced in rectifier modulators of the shunt (or «Cowan») and ring types are separated into those which are inherent in the operation of the modulator and those which are absent when the modulator is perfectly balanced.
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