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Residual harmonics in voltage unbalanced power systems
Industry Applications Society 40th Annual Petroleum and Chemical Industry Conference, 1994The analysis of residual harmonics requires combining linear and nonlinear analysis into a computer algorithm. The mathematical techniques are to apply state space methods to solve the nonlinear loads such as converters in a time domain format, analyze the resulting waveform with a Fourier analysis to convert the data to the frequency domain, and then ...
L.G. Grainger, R.C. Spencer
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Residual voltage endurance of generator insulation systems
Proceedings of 2014 International Symposium on Electrical Insulating Materials, 2014The insulation system of a generator is stressed by electrical, mechanical and thermal loads during the whole lifetime. By the means of diagnostic measurements the worsening of the condition within the dielectric system can be evaluated. To ensure the operational safety for the next maintenance period a hipot test with raised level can be applied.
Christof Sumereder, Mario Dolcic
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Induction motor residual voltage
Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting, 2002The residual voltage in an induction motor under an interrupted power supply condition is considered. The electromagnetic shock at the end of the motor coil due to the excessive surge current and the mechanical impact due to the greater transient torque are investigated.
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Residual Voltages and Currents in Power Systems
Transactions of the American Institute of Electrical Engineers, 1928In the problem of inductive coordination of power and communication systems, residual voltages and currents in the power lines are an important element, yet it is apparent that they are not in general well understood, Studies have been made and others are under way by well-equipped organizations, which will add much to the data concerning them. In this
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[Development of residual voltage testing equipment].
Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation, 2015For the existing measurement methods of residual voltage which can't turn the power off at peak voltage exactly and simultaneously display waveforms, a new residual voltage detection method is put forward in this paper. First, the zero point of the power supply is detected with zero cross detection circuit and is inputted to a single-chip microcomputer
Xiaohui, Zeng +4 more
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Technology of Removing Residual Voltages in Welded Constructions
2005 11th International Scientific and Practical Conference of Students, Post-graduates and Young Scientists - Modern Technique and Technologies, 2005The article demonstrates investigation results of vibrational processing influence on stressed-deforming condition of welded constructions. Vibrational treatment is ecological and less power-consuming technology of removing residual voltages arising in constructions during their manufacturing compared to traditional thermal treatment.
A.M. Fairushin +3 more
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2018 IEEE CPMT Symposium Japan (ICSJ), 2018
This paper evaluates the influence of common mode voltage in the floating voltage measurement with differential voltage probe, and proposes the procedure to compensate the influence of common mode voltage. The measured residual common mode voltage superimposed on differential voltage probe output is compensated with the measured residual common mode ...
Tsuyoshi Funaki, Kei Hayashi
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This paper evaluates the influence of common mode voltage in the floating voltage measurement with differential voltage probe, and proposes the procedure to compensate the influence of common mode voltage. The measured residual common mode voltage superimposed on differential voltage probe output is compensated with the measured residual common mode ...
Tsuyoshi Funaki, Kei Hayashi
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Enhancement of the SPD Residual Voltage at Apparatus Terminals in Low-Voltage Power Systems
IEEE Transactions on Power Delivery, 2007Surge protective devices (SPDs) are installed at the boundaries of lightning protection zones to damp the surges to the protection level of the SPD. If the circuit between the SPD and the apparatus to be protected is too long, the propagation of the surges leads to oscillation phenomenon.
Ibrahim A. Metwally, Fridolin H. Heidler
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Measurement and calculation of surge-arrester residual voltages
Measurement, 2011Abstract This paper presents accurate measurement of residual voltages of surge arresters (SA) by two designed charge meters (D-dot probes) as well as simulation validation in the high-conduction regime. Simultaneous impulse voltage measurements were conducted by using two D-dot probes, two uncompensated commercial mixed resistive–capacitive (RC ...
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Residual voltages analysis in reclosing process for induction machine
2008 7th World Congress on Intelligent Control and Automation, 2008Induction motor required continuous running frequently comes with reclosing process due to interrupted supply in power frequency. However, large current and torque of the motor incidentally appear in the process. The paper firstly analyzes reclosing dynamic process of induction machine at the time of the absence supply and presence stator residual ...
Aiyuan Wang, Zhihao Ling, Wenbo Liu
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