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Recorders provide information related to the “tap to tap” Arc Furnace's operation time. In this article, a heuristic analysis is performed for electric arc furnace operation. At a later stage of the investigation, an optimization of the operation is performed. Each step of the process is analyzed or put into operation according to the conditions of an expert. Under the specified operating conditions,...
Power quality records provide information related to voltage and current waveforms and also deformation indicators, such as unbalance, and flicker. This disaggregation does not provide a global view of the degree of quality deterioration throughout the system. Valuations based on disaggregation of waveforms is inadequate in steel companies due to the fact that unbalances, flicker, and other deformation...
Hydro-turbine maintenance would be made easier by measuring the multi-scale entropy of its sound and the magnetic waves produced. Currently used methods include parametric solid modeling, FEA analysis, CFD simulation, CAD design & drafting, PLC & SCADA programming, protections, engineering & testing, and power quality testing, among others. The purpose of this paper is to explore specific...
This paper describes methods used to analyze power system transients. Overvoltage analysis techniques are evaluated. The complete system, including power cables and power generation is simulated using the ATP version of the Electromagnetic Transient Program (EMTP) in addition with several experimental cases. A new method to power quality analysis, and detection of switching of the reclose rele and...
This paper describes a new method used to analyze problems associated with power line faults. Overvoltage analysis techniques are evaluated. The complete system, including power cables and power ground is simulated in a workstation for transient practices with several laboratory practices using an experimental rele. A new method for power quality analysis, and detection of switching of the reclose...
Electric arc furnace and its influence in the power system are studied in this paper. Two models that allow to evaluate its behavior during steady state are shown. These models has different complexity level; the first model takes into account the main nonlinearities of the load; the other assumes that current-voltage characteristic in the arc is piece-wise linear. Electromagnetic transients program...
This paper undertakes the study of failures in energy meters installed in low-voltage power network. The objective is to find a way to reduce the high failure rate that this type of equipment currently presents in the eastern zone of the departmento de Caldas, especially in the areas of greatest keraunic level. The methodology implemented enables root cause analysis, the proposal of remedial actions...
This paper introduces a new algorithm of polyphasic segmentation. This new algorithm combines the strength of the concept of voltage signal tensor with the benefits offered by the residual segmentation technique in order to generate a unique pattern of segmentation. This segmentation strategy is validated using a set of synthetic signals with voltage variation in the remnant voltage and the start...
This paper presents another way to assess power quality delivered by transformers. It has been shown that is possible to measure the wave form irregularity of electrical signals radiated by electrical systems by means of the sample entropy algorithm. The electro-magnetic signal entropy reveals the presence of harmonics in the industrial and domestic electric power supply. It will show magnetic radiated...
This paper presents another way to assess power quality delivered by transformers. The electro-magnetic signal entropy reveals the presence of harmonics in the industrial and domestic electric power supply. It will show some electromagnetic radiated wave measurements taken below 115 kV electric transformers circuits of Manizales city (Colombia) through a non-invasive and indirect measurement (using...
This paper presents a proposal for a LEMP simulator circuit for testing an RF-Based Lightning Detector integrated into a PQ Monitoring System to which was added the feature of Auto Correlation of power disturbances with the LEMP spectral components.
This paper presents a hybrid simulation to test control strategies in active power filters using the generalized power tensor theory. The tensor theory is based on the dyadic or tensor product between voltage and current vectors. This new definition allows the estimate of reference currents for the control of active power filters “APFs” in multiphase systems. The hybrid simulation consists in a combination...
Constructing maps of loss or deterioration of power quality, due to stationary and non-stationary disturbances, is of great importance for the control, protection and analysis of power systems. Therefore, a technique for two- and three-dimensional maps visualization of the deterioration of power quality in electrical networks based in the power tensor theory is proposed. The objective of the technique...
This paper describes methods used to analyze problems associated with arc furnace and its influence on the power system. Some measurements are analyzed using wavelet transform for harmonic, flicker and unbalance detection. A set of data obtained from simulation and measurement in a furnace are used to evaluate the performance of this method (called pqAT). Experimental results are presented and used...
The number and power of loads that pollute the electric network, from an electric point of view, are constantly increasing. For this reason this study aims to define a parameter to assess, in terms of distortion and unbalance, the quality of an electric network. Taking as a starting point the advantages and limitations of wavelet methods proposed in the literature, a new index useful to quantify the...
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