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All Journal International Journal of Electrical and Computer Engineering
Hernán Hernández
Universidad Simon Bolivar
Computer Science & IT Electrical & Electronics Engineering

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Flow regulation at constant head in feedwater pumps in a sugar industry Julio R. Gómez; Vladimir Sousa; Mario S. Quintana; Percy R. Viego; Hernán Hernández; Enrique C. Quispe
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 2: April 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (554.623 KB) | DOI: 10.11591/ijece.v9i2.pp732-741

Abstract

In this paper the feasibility of energy saving by implementing flow regulation at constant load in feedwater pumps in a sugar industry is studied. As regulation strategy, the use of a variable speed drive in the hydraulic system is proposed. For the project evaluation, the Net Present Value and Payback Period techniques are used. Among the variables considered are the price of energy, the equipment useful life, financial data and those related to environmental impact. As a result, it was found that if only a commercial approach is considered, the energy saving strategy is profitable but not attractive, because investment is recovered in a period close to the useful life of technology. However, if a government focus that encourages the implementation of these energies saving strategies is considered, the investment of the project recovers in a short time.
A mho type phase comparator relay guideline using phase comparison technique for a power system José Antonio González-Cueto; Zaid García Sánchez; Gustavo Crespo Sánchez; Hernan Hernandez; Jorge Iván Silva Ortega; Vicente Leonel Martínez Díaz
International Journal of Electrical and Computer Engineering (IJECE) Vol 11, No 2: April 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v11i2.pp929-944

Abstract

This paper presents a mho distance relay simulation based on the phase comparison technique using a typical electrical power systems analysis software for two cases: when the operation state is close to the static voltage limit and during a dynamic perturbation in the system. The paper evaluates the impedance variations caused by complex voltage values, the mho polarization, and the comparator operating region into the complex plane. In addition, the paper found the information for the dynamic perturbations from the outputs considering a mid-term stability program. The simulation of the mho-phase comparator in the static voltage proximity limit detects unit distance elements with impedance measured close to reach the threshold in the steady-state. Dynamic mho simulations in the complex plane are successfully tested by plotting time phase difference curves on the comparator input signals. Relay programmers can use these curves to analyze other phase comparators applications and the corresponding models in the complex plane.
Co-Authors Enrique C. Quispe Gustavo Crespo Sánchez Jorge Iván Silva Ortega José Antonio González-Cueto Julio R. Gómez Mario S. Quintana Percy R. Viego Vicente Leonel Martínez Díaz Vladimir Sousa Zaid García Sánchez