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. </span

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