Results 261 to 270 of about 50,402 (304)
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Cocaine unbalances endothelial tissue factor and tissue factor pathway inhibitor expression
Journal of Molecular and Cellular Cardiology, 2006Cocaine consumption can lead to myocardial infarction. Tissue factor (TF) has been implicated in acute coronary syndromes, and the balance of TF and tissue factor pathway inhibitor (TFPI) determines initiation of thrombus formation. This study was designed to investigate the effect of cocaine on endothelial TF and TFPI expression. Cocaine (10(-8)-10(-5)
Steffel J +4 more
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A Novel Approach Toward Interpretation and Application of Voltage Unbalance Factor
IEEE Transactions on Industrial Electronics, 2007Voltage unbalance has been interpreted in a number of ways based on the conditions and complexities that are involved. This paper takes the widely used expression of voltage unbalance factor (VUF) and puts forward the various ambiguities that arise due to voltage variation and unbalance when applied to a test case.
P. Giridhar Kini +2 more
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Impact of sampling frequency on accuracy of unbalance factor measurement by DFT
2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2015The proposed paper is to discuss the problem of accuracy of unbalance factor measurement by discrete Fourier transform (DFT). Particularly, a problem of inappropriate sampling frequency is considered, when signals are sampled non-coherently. The measurement window width and its shape are considered as well.
Tomasz Tarasiuk, Andrzej Pilat
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A Hybrid Islanding Detection Method Considering Voltage Unbalance Factor
2020 IEEE International Symposium on Sustainable Energy, Signal Processing and Cyber Security (iSSSC), 2020Islanding Detection in the distributed generation (DG) system is a major function that needs to be addressed. Traditional Islanding Detection methods such as the passive ones have drawbacks in the form of existence of large nondetection zones whereas Active Detection Methods have devastating effects on power quality.
Anwesha Manisha Nayak +2 more
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Comparison of voltage unbalance factor by line and phase voltage
2005 International Conference on Electrical Machines and Systems, 2005Most of the loads in industrial power distribution systems are balanced and connected to three power systems. However, voltage unbalance is generated at the user's 3-phase 4-wire distribution systems with single & three phase. Voltage unbalance is mainly affected by load system rather than power system. Unbalanced voltage will draws a highly unbalanced
null Jong-Gyeum Kim +3 more
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Estimating the voltage unbalance factor using distribution system state estimation
2010 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe), 2010Unbalance is a damaging and costly phenomenon for both network operators and end users. Network operators are increasingly looking at ways in which they can intelligently monitor their exposure to unbalance and its related problems. This paper presents initial results obtained with a new methodology for estimation of the voltage unbalance factor at any
Nick C. Woolley, Jovica V. Milanovic
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Evaluation of line loss under load unbalance using the complex unbalance factor
IEE Proceedings - Generation, Transmission and Distribution, 1995The paper introduces simple criteria to evaluate the line loss under load unbalance by using the complex unbalance factor. The definitions of voltage and current unbalance factors have been extended from the conventional real values to the corresponding values. The complex-valued unbalance factor is composed of a magnitude and an argument portion.
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The Impact Analysis of Various Unbalance Factors on the PCC Voltage Imbalance
2014 IEEE Electrical Power and Energy Conference, 2014Excessive voltage unbalance levels under normal operating conditions has become a power quality problem of concern in many power networks. Most available unbalance study only considers the three-phase three-wire power system and concentrates on the unbalance definitions, standards and effects.
Yuanyuan Sun +3 more
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Type detection of voltage sags through voltage unbalance factor
2012 IEEE 15th International Conference on Harmonics and Quality of Power, 2012This paper presents a new method to characterize and detect the type of voltage sag through complex voltage unbalance factor (CVUF). Different types of voltage dip due to unbalance faults in power system are evaluated in term of CVUF and an attempt is made to characterize and detect the types of dip through this factor.
Padmanabh Thakur +2 more
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Power factor measurement for rotating machines under system unbalance
IMTC/99. Proceedings of the 16th IEEE Instrumentation and Measurement Technology Conference (Cat. No.99CH36309), 2003Sequence powers are a form of electrical pollution for the vast majority of rotational loads, since these powers contribute to both line and machine losses. The negative sequence power resulting in counter-torque reduces useful work. Therefore, the negative sequence should be accounted for in the power factor calculations.
L. Eren, M.J. Devaney
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