A5013182344- Power Quality and Harmonics
- Power Transformer Diagnostics and Insulation
- Power Systems Fault Detection
- Energy Load and Power Forecasting
- Smart Grid Energy Management
- Lightning and Electromagnetic Phenomena
- Magnetic Properties and Applications
- High voltage insulation and dielectric phenomena
- Power System Optimization and Stability
- Fault Detection and Control Systems
- IoT-based Smart Home Systems
- Water Quality Monitoring and Analysis
- Electromagnetic Compatibility and Noise Suppression
- Electricity Theft Detection Techniques
- Building Energy and Comfort Optimization
- Spectroscopy and Chemometric Analyses
- Islanding Detection in Power Systems
- Mineral Processing and Grinding
- Impact of Light on Environment and Health
- Power System Reliability and Maintenance
- Advanced Battery Technologies Research
- Urban Arborization and Environmental Studies
Federal Center for Technological Education of Minas Gerais
1998-2016
Centro Universitário de Belo Horizonte
2016
Universidade Federal de Minas Gerais
1998
The determination of the polarization spectrum in low frequency region dissipation factor, commonly has been used practice to diagnose insulation conditions. recovery voltage method (RVM) is one methods estimate spectrum. Nevertheless, current analysis RVM tests do not use all information available from test. In this paper, a mathematical model proposed. It shown that, derived model, some hidden peaks can be identified. Since difficulty derive data increases with number identified, simpler...
A methodology is presented to detect high-impedance faults in radial distribution feeders by means of fuzzy logic reasoning. The proposed technique based on the analysis feeder responses impulse waves which are periodically injected at inlet. These compared standard were previously stored a database. Standard correspond operating normal configurations. supervisory system processes information database and, using inference machine, indicates possible occurrences abnormalities. has been tested...
International Standards ANSI C84.1-2006 and IEEE std 1250-1995 specify the range of supply voltage to electronics equipment from 0.9 1.05 per-unit (pu) nominal voltage. From this information, it is possible feed with a level below without failures. The Conservation Voltage Reduction (CVR) technique that aims achieve reduction power consumption by reducing voltage, giving at customer location lowest compatible both values levels stipulated regulatory agency. It essential obtaining good model...
Detection of moisture in oil and paper is a key factor determining the health insulation power transformer. High content severely degrades insulating strength may eventually cause failure. It therefore highly desirable to detect incipient Recently, method based on Recovery Voltage Measurement (RVM) transformers has been successfully used by Pacific Power International Australian state New South Wales identify conditions such as contaminated bushings, traces solvent oil, effectiveness vacuum...
The total harmonic distortion (THD) of current in a feeder cannot be calculated using THD each load. Each order can range from cancellation to addition depending on its phase angle. In this paper, method for prediction distortions nonlinear loads operating together is proposed. This uses model able predict the magnitude spectrum and loads. paper experimental data simplified practical approach that carried out frequency domain. based harmonically coupled admittance matrix. These matrices are...
Presents letters sent to the editor regarding previous articles from this publication or other relevant topics of discussion.
Theme Power Quality has been increasingly receiving attention in electrical engineering research, especially that directed to the industrial sector. Harmonics are a disturbance have substantial impact on system. It normally caused by features of system changed over time because intensive insertion electronic equipment and arc devices. This work studies main real steel facility, specifically some important production is directly associated with generation contribution this paper presents...
The paper presents a new methodology for automatic detection of high impedance faults in primary distribution feeders. An intelligent system continuously monitors the feeder response to short pulse signal injected at substation outlet. Any significant change not observed during normal operations is prone be fault. supervisory and processes gathered information by means Intelligent System. Basically, it composed case database rule that operates with fuzzy numbers. To validate technique...
Cooling systems are widely used for the preservation of food products, chemicals, pharmaceuticals, blood derivatives and in many other industrial applications. To avoid spoilage, products must always be kept a suitable temperature range, with lowest possible fluctuation. As these devices have to constantly energized, its share contribution total energy consumption is generally very significant. An effective control variations each cooling unit by means continuous monitoring system, real...
Although the switching of capacitor banks produces transients, such operations are necessary and an integral part a power system. The transient produced in this way can propagate through distribution lines be magnified shunt compensated loads. Magnifications these surges studied, it is found that, if there two LC loops with same natural frequencies, overvoltage by first loop second one. magnification depends on capacitance frequency ratios. paper analyses response system shows how overhead...