15 research outputs found
Voltage drop repercussions in industrial processes due to the interaction of several machines in a manufacturing cell
746-753This paper
presents a novel methodology based on S transform and power quality analysis
for the study of voltage variation generated by simultaneous operation of
equipment in a manufacturing cell and their impact on susceptible equipment as
well as their implications in the turning process.
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A Phasor Estimation Algorithm based on Hilbert Transform for P-class PMUs
Phasor measurement units (PMUs) play an important role in many applications of power systems. In order
to ensure a reliable performance, the phasor estimation algorithm has to satisfy a set of requirements
stated in the IEEE Standard C37.118.1, which establishes the test conditions and requirements for
steady-state and dynamic conditions. There, two classes of performance, P and M, can be found.
In general, P-class is intended for applications that require fast response and M-class is used when
greater precision is necessary. In this paper, a novel algorithm based on Hilbert transform for
phasor estimation in compliance with the IEEE standard C37.118.1 for P-class is proposed. Advantages
of the proposal are a fast response and a low computational burden due to the HT implementation as
a low-order filter of one cycle. Further, two low-complex strategies of compensation are proposed.
The proposal is validated using all the test conditions specified in the IEEE Standard C37.118.1.
Besides that, real voltage and current signals of an electrical system are analyzed. The obtained
results demonstrate that the new proposal can meet all the requirements for P-class performance
Real-time high-resolution frequency estimation of electric signals in industrial applications
327-331This study develops a low cost hardware processing
unit implemented in a field-programmable-gate-array (FPGA) device and based on
Chirp-z transform for real-time high-resolution frequency computation of
electric signals in industrial applications. This hardware unit complies with international standards for frequency
measurement in electrical systems.
Effectiveness of proposed frequency-estimation unit was experimentally
validated using case studies
Methodology for Overheating Identification on Induction Motors under Voltage Unbalance Conditions in Industrial Processes
100-107<span style="font-size:9.0pt;font-family:
" times="" new="" roman","serif";mso-fareast-font-family:"times="" roman";mso-bidi-font-family:="" mangal;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:="" hi"="" lang="EN-US">This paper presents a new methodology to assist the preventive maintenance
through the identification and diagnosis of undesired overheating conditions in
multiple induction motors installed in industrial facilities. The
identification is performed by monitoring the voltage in the electrical system
and the temperature characteristic curve of the motor obtained through infrared
(IR)-thermography in the presence of voltage unbalance</span
The politics of fiscal policy in Europe
In this review the books: Economics, Politics and Budgets: The Political Economy of Fiscal Consolidations in Europe Carlos Mulas-Granados (Basingstoke, Palgrave Macmillan, 2006), 316pp., ISBN: 978 1 4039 9942 9 and Fiscal Governance in Europe Mark Hallerberg, Strauch and Jürgen von Hagen (Cambridge, Cambridge University Press, 2009), 230pp., ISBN: 978 0 521 85746 8 are reviewed