CURSO DIÁRIO E SAZONAL DO POTENCIAL HÍDRICO FOLIAR DE MOGNO EM SISTEMAAGROFLORESTAL1

Este trabalho objetivou avaliar o curso diário e sazonal do potencial hídrico foliar de mogno (Swietenia macrophylla King) (Meliaceae) em sistema agroflorestal (SAF). O experimento foi realizado em árvores de S. macrophylla plantadas num sistema agroflorestal instalado no Campo Experimental da Embrapa Amazônia Ocidental, Manaus, AM. Avaliou-se o potencial hídrico foliar (Ψf) dos cursos diário e sazonal nos anos 2004 e 2005, por meio da utilização de bomba de pressão tipo Scholander. Os resultados indicaram que os valores do Ψf de S. macrophylla, de modo geral, foram superiores no início da manhã e no final da tarde, com redução acentuada ao meio-dia, e que, em relação à sazonalidade de precipitação, as menores taxas foram reportadas para a época menos chuvosa, variando de -26 bar em 2004 para -31bar em 2005. Verificou-se que o potencial hídrico de Swietenia macrophylla em sistema agroflorestal sofreu reduções significativas em razão dos baixos índices pluviométricos entre junho e outubro de 2005

Analysis Of Electric Characteristics Of High-elevation Stretches Of The Tucuruí-macapá-manaus Connection

This article contains a detailed study of the parameters and electric characteristics of a transmission system proposed to electrically connect the cities ofTucuruí,Macapá and Manaus. Several sections of this transmission line will be supported by steel towers 280 m high to suspend the line above the Amazon tropical forest. The height of the line and the presence of two dielectrics in the system-the air and the forest-produce unique line parameters compared to the longitudinal parameters of a conventional line, which is approximately 40 m high. A preliminary analysis of the parameters of a line section of the Tucuruí-Macapá-Manaus connection is conducted in this article. The behaviors of potential surges in the line resulting from switching operations and atmospheric discharges are also investigated. © Brazilian Society for Automatics-SBA 2013.245714724De Doile, G.N.D., Nascimento, R.L., Tucuruí transmission line - 1800 km of Regional Integration (2010) Revista T&C Amazônia, 8 (18), pp. 58-62Dommel, H.W., (1986) Electromagnetic Transients Program Reference Manual, , Vancouver, Canada: Department of Electrical Engineering, University of British ColumbiaFrota, W.M., Supply Structure Improvements for the Isolated Electrical systems of Manaus and Macapá (2005) Revista T&C Amazônia, 3 (6), pp. 23-29Fuchs, R.D., (1979) Transmissão de Energia Elétrica: Linhas AéreasTeoria das Linhas em Regime Permanente. [Transmission of Electrical Energy: Overhead LinesTheory of Lines at Steady State], , Rio de Janeiro: Livros Técnicos e Científicos(2011), http://www.hebeicomms.com, Accessed 15 April 2011Hofmann, L., Series expansions for line impedances considering different specific resistances, magnetic permeabilities and dielectric permittivities of air and ground (2003) IEEE Transactions on Power Delivery, 18 (2), pp. 564-570(2010) High-voltage Test Techniques - Part 1: General Definitions and Test Requirements, , IEC 60060-1. Ed. 3Kurokawa, S., Yamanaka, F.N.R., Prado, A.J., Bovolato, L.F., Pissolato, J., Representaiton of Transmission Lines through State Variables taking into Consideration the Effect of Frequency on the Longitudinal Parameters (2007) Revista Controle & Automação, 18 (3), pp. 337-346Lima, A.C.S., Portela, C., Inclusion of frequency-dependent soil parameters in transmission-line modeling (2007) IEEE Transactions on Power Delivery, 22 (1), pp. 492-499Martinez, J.A., Gustavsen, B., Durbak, D., Parameters determination for modeling system transients - Part 1: Overhead lines (2005) IEEE Transactions on Power Delivery, 20 (3), pp. 2038-2044Mingli, W., Yu, F., Numerical calculations of internal impedance of solid and tubular cylindrical conductors under large parameters (2004) IEE Proceedings on Generation, Transmission and Distribution, 151 (1), pp. 67-72Nguyen, H.V., Dommel, H.W., Marti, J.R., Direct phasedomain modelling of frequency-dependent overhead transmission lines (1997) IEEE Transactions on Power Delivery, 12 (3), pp. 1335-1342Notaros, B.M., (2011) Eletromagnetismo [Electromagnetism], , São Paulo: Pearson(2011) Operador Nacional do Sistema Elétrico [National Electrical System Operator] - ONS, , http://www.ons.gov.br, Accessed 15 April 2011Pinheiro, M.P., Tavares, M.C., Analysis of the sensitivity of electrical parameters of transmission lines depending on frequency (2009) Revista Controle & Automação, 20 (3), pp. 335-344Rachidi, F., Tkachenko, S.V., (2008) Electromagnetic Field Interaction with Transmission Lines: From Classical Theory to HF Radiation Effects, , Southampton, UK: WITWang, Y.J., Liu, S.J., A review of methods for calculation of frequency-dependent impedance of overhead power transmission lines (2001) Proceedings of the National Science Council, 25 (6), pp. 329-33

Mutual Coupling Modeling In Transmission Lines Directly In The Phase Domain

This paper describes a computational model based on lumped elements for the mutual coupling between phases in three-phase transmission lines without the explicit use of modal transformation matrices. The self and mutual parameters and the coupling between phases are modeled using modal transformation techniques. The modal representation is developed from the intrinsic consideration of the modal transformation matrix and the resulting system of time-domain differential equations is described as state equations. Thus, a detailed profile of the currents and the voltages through the line can be easily calculated using numerical or analytical integration methods. However, the original contribution of the article is the proposal of a time-domain model without the successive phase/mode transformations and a practical implementation based on conventional electrical circuits, without the use of electromagnetic theory to model the coupling between phases. © 2011 IEEE.374379Mamis, M.S., Computation of electromagnetic transients on transmission lines with nonlinear components (2003) IEE. Proc. Gener. Transm. Distrib, 150 (2), pp. 200-204. , MarchMamis, M.S., Meral, M.E., State-space modeling and analysis of fault arcs (2005) Electric Power Systems Research, 76 (1), pp. 46-51. , SeptemberMamis, M.S., State-space transient analysis of single-phase transmission lines with corona Proc International Conference on Power Systems Transients-IPST'03, New Orleans, USA, 2003Mamis, M.S., Nacaroglu, A., Transient voltage and current distributions on transmission lines (2002) IEE. Proc. Gener. Transm. Distrib, 149 (6), pp. 705-712. , NovemberMacías, J.A.R., Expósito, A.G., Soler, A., A comparison of techniques for state-space transient analysis of transmission lines (2005) IEEE Transactions on Power Delivery, 20 (2), pp. 894-903. , AprilKurokawa, S., Costa, E.C.M., Pissolato, J., Prado, A.J., Bovolato, L.F., Proposal of a transmission line model based on lumped elements: An analytic solution (2010) Electric Power Comp. & Syst., 38 (14), pp. 1577-1594. , DecemberWedepohl, L.M., Nguyen, H.V., Irwin, G.D., Frequency-dependent transformation matrices for untransposed transmission lines using Newton-Raphson Method (1996) IEEE Trans. on Power Delivery, 11 (3), pp. 1538-1546. , AugustCampos, J.C.C., Pissolato, J., Prado, A.J., Kurokawa, S., Single real transformation matrices applied to double three-phase transmission lines (2008) Electric Power Systems Research, 78 (10), pp. 1719-1725. , OctoberCampos, J.C.C., Pissolato, J., Prado, A.J., Kurokawa, S., Single real transformation matrices applied to Double three-phase lines (2008) Electric Power System Research, 78 (1), pp. 1719-1725Costa, E.C.M., Kurokawa, S., Pissolato, J., Prado, A.J., Efficient procedure to evaluate electromagnetic transients on three-phase transmission lines (2010) IET Gener. Trans. & Distr., 4 (9), pp. 1069-1081. , MayKurokawa, S., Pissolato, J., Tavares, M.C., Portela, C.M., Prado, A.J., Behavior of overhead transmission line parameters on the presence of ground wires (2005) IEEE Trans. on Power Delivery, 20 (2), pp. 1669-167

New Approach To Four-phase Transmission Systems: Analysis Of The Transient Response And The Possible Voltage Surges

This study describes a technical analysis of a four-phase line as a transmission system alternative. An analysis in the frequency and the time domains is performed to evaluate the electrical characteristics and the transient response of a generic four-phase system compared with those of a conventional three-phase transmission system. The technical features of this non-conventional system are discussed and reviewed based on the current literature. Thus, a new analysis of the four-phase system is presented that emphasises several technical characteristics that have not been discussed in previous studies. © 2012 The Institution of Engineering and Technology.65387394Farag, A.S., Bakhashwain, J.M., Al-Shehri, A., Cheng, T.C., Gao, Y., Bundled conductor configuration optimization for compact transmission lines incorporating electromagnetic fields management (1998) Electr. Power Syst. Res., 44, pp. 189-202. , 10.1016/S0378-7796(97)01199-1, 0378-7796Wei-Gang, H., Study on conductor configuration of 500 kV Chang-Fang compact line (2003) IEEE Trans. Power Deliv., 18 (3), pp. 1002-1008. , 10.1109/TPWRD.2003.813828, 0885-8977Pinto, A.J.P., Costa, E.C.M., Kurokawa, S., Pissolato, J., Analysis of the electrical characteristics of an alternative solution for the Brazilian-Amazon transmission system (2011) Electric Power Comp. Syst., 39 (13), pp. 1424-1436. , 10.1080/15325008.2011.584106Pinto, A.J.P., Costa, E.C.M., Kurokawa, S., Pissolato, J., Introduction of a non-conventional solution for Amazon transmission system: analysis of the electric aspects (2011) Proc. IEEE/PES General Meeting, , Detroit, Michigan, USA, JulyGomes, E., Tavares, M.C., Analysis of the energization test of a half-wavelength AC link composed of similar transmission lines (2011) Proc. Asia-Pacific Power and Energy Engineering Conf., , Wuhan, China, MarchSamorodov, G., Zilberman, S., Krasilnikov, E., Application of half-wave transmission systems for power delivery over extra long distances 2000-4000 km (2011) Proc. IEEE Electrical Power and Energy Conf., , Winnipeg, MB, Canada, OctoberMazzanti, G., Quaia, S., Four-phase AC connections: an alternative possibility for the expansion of transmission grids (2010) IEEE Trans. Power Deliv., 25 (2), pp. 1010-1018. , 10.1109/TPWRD.2009.2035702, 0885-8977Mazzanti, G., Quaia, S., Can four-phase transmission lines be considered as a practical alternative to traditional three-phase lines in the European electricity market? (2007) Proc. IEEE PES Power Tech, , Lausanne, Switzerland, JulyLonders, T.L., Richeda, R.J., Krizauskas, E., High phase order economics: constructing a new transmission line (1998) IEEE Trans. Power Deliv., 13 (4), pp. 1521-1526. , 10.1109/61.714849, 0885-8977Guangye, L., Yang, Y., Three-phase-to-four-phase transformer for four- phase power-transmission systems (2002) IEEE Trans. Power Deliv., 17 (4), pp. 1018-1022. , 10.1109/TPWRD.2002.803719, 0885-8977Austen, A.S., Franklin, A.C., The J & P transformer book (1973), pp. 151-155. , Johnson and Phillips, LondonLiu, G.Y., Yang, Y.H., Study of four-phase power transmission systems (2002) Proc. Inst. Elect. Eng. - Gener. Trans. Distr., 149 (4), pp. 397-401. , 10.1049/ip-gtd:20020461Samorodov, G., Krasilnikova, T., Dikoy, V., Zilberman, S., Iatsenko, R., Non-conventional reliable AC transmission systems for Power delivery at long and very long distance (2002) Proc. IEEE/PES T & D Conf. Exhib.: Asia Pacific, , Yokohama, Japan, OctoberCosta, E.C.M., Kurokawa, S., Pissolato, J., Prado, A.J., Efficient procedure to evaluate electromagnetic transients on three-phase transmission lines (2010) IET Gener. Transm. Distrib., 4 (9), pp. 1069-1081. , 10.1049/iet-gtd.2009.0660Kurokawa, S., Costa, E.C.M., Pissolato, J., Prado, A.J., Bovolato, L.F., Proposal of a transmission line model based on lumped elements: an analytic solution (2010) Electric Power Comp. Syst., 38 (14), pp. 1577-1594. , 10.1080/15325008.2010.492450IEC 60060-1: 'High-voltage test techniques - part 1: general definitions and test requirements. Ed. 3, 2010Wedephol, L.M., Nguyen, H.V., Irwin, G.D., Frequency-dependent transformation matrices for untransposed transmission lines using Newton-Raphson method (1996) IEEE Trans. Power Syst., 11 (3), pp. 1538-1546. , 10.1109/59.535695, 0885-8950Dommel, H.W., Electromagnetic transients program reference manual (EMTP theory book) (1989), University of British Columbia, Department of Electrical Engineering, Vancouver, Canada )Gatous, O.M.O., Pissolato, J., Frequency-dependent skin-effect formulation for resistance and internal inductance of a solid cylindrical conductor (2004) IEE Proc. Microw. Antennas Propag., 151 (3), pp. 212-216. , 10.1049/ip-map:20040469, 1350-2417Campos, J.C.C., Pissolato, J., Prado, A.J., Kurokawa, S., Single real transformation matrices applied to double three-phase transmission lines (2008) Electr. Power Syst. Res., 78 (10), pp. 1719-1725. , 10.1016/j.epsr.2008.03.001, 0378-7796Budner, A., Introduction of frequency-dependent line parameters into an electromagnetic transients program (1970) IEEE Trans. Power Appar. Syst., 89 (1), pp. 88-97. , 10.1109/TPAS.1970.292674, 0018-9510Kurokawa, S., Pissolato, J., Tavares, M.C., Portela, C.M., Prado, A.J., Behaviour of overhead transmission line parameters on the presence of ground wires (2005) IEEE Trans. Power Deliv., 20 (2), pp. 1669-1676. , 10.1109/TPWRD.2004.833916, 0885-897

Real-time Estimation Of Transmission Line Impedance Based On Modal Analysis Theory

The objective of this paper is to show a methodology to estimate the longitudinal parameters of transmission lines. The method is based on the modal analysis theory and developed from the currents and voltages measured at the sending and receiving ends of the line. Another proposal is to estimate the line impedance in function of the real-time load apparent power and power factor. The procedure is applied for a non-transposed 440 kV three-phase line. © 2011 IEEE.Hofmman, L., Series expansions for line series impedances considering different specific resistances, magnetic permeabilities and dielectric permittivities of conductors, air, and ground (2003) IEEE Trans. on Power Delivery, 18 (2), pp. 564-570. , AprilPortela, C., Tavares, M.C., Modeling, simulation and optimization of transmission lines. Applicability and limitations of some used procedures (2002) IEEE PES Transmission and Distribution, , São Paulo, BrazilSemlyen, A., Some frequency domain aspects of wave propagation on nonuniform lines (2003) IEEE Trans. on Power Delivery, 18 (1), pp. 315-322. , JanIndulkar, C.S., Ramalingam, K., Estimation of transmission line parameters from measurements (2008) Electrical Power and Energy Systems, 30 (5), pp. 337-342Kuffel, R., Giesbrecht, J., Maguire, T., Wierckx, R.P., Mclaren, P., RTDS-a fully digital power system simulator operation in real time (1995) IEEE WESCANEX 95 - Communications, Power and Computing Conf. Proc., 2, pp. 300-305. , Winnipeg, CanadaMarti, J.R., Linares, L.R., Calvino, J., Dommel, H.W., Lin, J., OVNI: Na object approach to real-time Power system simulators (1998) Proc. of the Power System Conference - POWERCON'98, 2, pp. 977-981. , Beijing, ChinaMartinez, J.A., Gustavsen, B., Durbak, D., Johnson, B., Mahseredjian, J., Mork, B., Walling, R., Parameter determination for modeling system transients - Part I: Overhead lines (2005) IEEE Transactions on Power Delivery, 20 (3), pp. 2038-2044. , DOI 10.1109/TPWRD.2005.848678Wang, Y.J., Liu, S.J., A review of methods for calculation of frequency-dependent impedance of overhead power transmission lines (2001) Proc. Natl. Sci. Counc., 25 (6), pp. 329-338Dommel, H.W., (1986) EMTP Theory Book, , VancouverBudner, A., Introduction of frequency-dependent line parameters into an electromagnetic transients program (1970) IEEE Trans. on Power Apparatus and Systems, PAS-89 (1), pp. 88-97. , JanMarti, J.R., Accurate modeling of frequency-dependent transmission lines in electromagnetic transient simulations (1982) IEEE Trans. on Power Apparatus and Systems, PAS-101 (1), pp. 147-155. , JanWedepohl, L.M., Nguyen, H.V., Irwin, G.D., Frequency-dependent transformation matrices for untransposed transmission lines using Newton-Raphson Method (1996) IEEE Trans. on Power Delivery, 11 (3), pp. 1538-1546. , AugustCampos, J.C.C., Pissolato, J., Prado, A.J., Kurokawa, S., Single real transformation matrices applied to double three-phase transmission lines (2008) Electric Power Systems Research, 78 (10), pp. 1719-1725. , OctoberKurokawa, S., Pissolato, J., Tavares, M.C., Portela, C.M., Prado, A.J., A new procedure to derive transmission-line parameters: Applications and restrictions (2006) IEEE Transactions on Power Delivery, 21 (1), pp. 492-498. , DOI 10.1109/TPWRD.2005.852296Kurokawa, S., Yamanaka, F.N.R., Prado, A.J., Pissolato, J., Inclusion of the frequency effect in the lumped parameters transmission line model: State space formulation (2009) Electric Power Systems Research, 79 (7), pp. 1155-1163. , Jul

Introduction Of A Non-conventional Solution For Amazon Transmission System: Analysis Of The Electric Aspects

This article shows an analysis of the longitudinal electric parameters of a three-phase transmission line/section using a 280-meter high steel tower. This characteristic, the height of the line conductors and distance between them, are intrinsic related to the longitudinal and transversal parameters of the line. By this means, an accurate study was carried out in order to show the electric variations between a transmission line using the new technology and a three-phase conventional 440 kV line for a wide range of frequencies and a variable soil resistivity. In addition, by using a digital line model, simulations are carried out in time domain to analyze critical overvoltage transients on the studied line. © 2011 IEEE.(2010) Technique Catalog, , http://www.hebeicomms.com/cp1.htm, November Available(2008) Notice of Auction 004/2008, , www.aneel.gov.br, Brazil, March, [online] AvailableDommel, H.W., (1986) EMTP Theory Book, , VancouverMingli, W., Yu, F., Numerical calculations of internal impedance of solid and tubular cylindrical conductors under large parameters (2004) IEE. Proc. Gener. Transm. Distrib, 151 (1), pp. 67-72Martinez, J.A., Gustavsen, B., Durbak, D., Johnson, B., Mahseredjian, J., Mork, B., Walling, R., Parameter determination for modeling system transients - Part I: Overhead lines (2005) IEEE Transactions on Power Delivery, 20 (3), pp. 2038-2044. , DOI 10.1109/TPWRD.2005.848678Kurokawa, S., Filho, J.P., Tavares, M.C., Portela, C.M., Prado, A.J., Behavior of overhead transmission line parameters on the presence of ground wires (2005) IEEE Transactions on Power Delivery, 20 (2 II), pp. 1669-1676. , DOI 10.1109/TPWRD.2004.833916Budner, A., Introduction of frequency-dependent line parameters into an electromagnetic transients program (1970) IEEE Transactions on Power Apparatus and Systems, 89 (1), pp. 88-97Kastrup, O., Zanetta, L.C., Lightning performance assessment with line arresters Proc. IEEE Transmission and Distribution Conf. and Exposition, Los Angeles, USA, September, 199

Proposal Of An Alternative Transmission Line Model For Symmetrical And Asymmetrical Configurations

This article shows a transmission line model for simulation of fast and slow transients, applied to symmetrical or asymmetrical configurations. A transmission line model is developed based on lumped elements representation and state-space techniques. The proposed methodology represents a practical procedure to model three-phase transmission lines directly in time domain, without the explicit or implicit use of inverse transforms. In three-phase representation, analysis modal techniques are applied to decouple the phases in their respective propagation modes, using a correction procedure to set a real and constant matrix for untransposed lines with or without vertical symmetry plane. The proposed methodology takes into account the frequency-dependent parameters of the line and in order to include this effect in the state matrices, a fitting procedure is applied. To verify the accuracy of the proposed state-space model in frequency domain, a simple methodology is described based on line distributed parameters and transfer function associated with input/output signals of the lumped parameters representation. In addition, this article proposes the use of a fast and robust integration procedure to solve the state equations, enabling transient and steady-state simulations. The results obtained by the proposed methodology are compared with several established transmission line models in EMTP, taking into account an asymmetrical three-phase transmission line. The principal contribution of the proposed methodology is to handle a steady fundamental signal mixed with fast and slow transients, including impulsive and oscillatory behavior, by a practical procedure applied directly in time domain for symmetrical or asymmetrical representations. © 2011 Elsevier Ltd. All rights reserved.33813751383Macias, J.A.R., Exposito, A.G., Soler, A.B., A comparison of techniques for state-space transient analysis of transmission lines (2005) IEEE Transactions on Power Delivery, 20 (2), pp. 894-903. , DOI 10.1109/TPWRD.2005.844271Mamis, M.S., Computation of electromagnetic transients on transmission lines with nonlinear components (2003) IEE Proc Gener Transm Distrib, 150 (2), pp. 200-204Mamis, M.S., Meral, M.E., State-space modeling and analysis of fault arcs (2005) Electric Power Systems Research, 76 (1-3), pp. 46-51. , DOI 10.1016/j.epsr.2005.04.002, PII S0378779605001355Mamis, M.S., State-space transient analysis of single-phase transmission lines with corona (2003) Proceedings of the International Conference on Power Systems Transients - IPST'03, pp. 1-5. , New Orleans, Lousiana, USASeptemberMamis, M.S., Nacaroglu, A., Transient voltage and current distributions on transmission lines (2002) IEE Proc Gener Transm Distrib, 149 (6), pp. 705-712Moreno, P., Gómez, P., Nareno, J.L., Guardado, J.L., Frequency domain transient analysis of electrical networks including non-linear conditions (2005) Int J Electr Power Energy Syst, 27 (2), pp. 139-156Campos, J.C.C., Pissolato, J., Prado, A.J., Kurokawa, S., Single real transformation matrices applied to double three-phase transmission lines (2008) Electr Power Syst Res, 78 (1), pp. 1719-1725Kurokawa, S., Yamanaka, F.N.R., Prado, J.A., Pissolato, J., Inclusion of the frequency effect in the lumped parameters transmission line model: State space formulation (2009) Electr Power Syst Res, 79 (7), pp. 1155-1163Prado, A.J., Kurokawa, S., Pissolato, J., Bovolato, L.F., Step by step analyses of Clarke's matrix correction procedure for untransposed three-phase transmission line cases (2010) Proceedings of IEEE General Meeting. Minneapolis, Minnesota, USA, pp. 1-9. , JulyMarti, J.R., Accurate modeling of frequency-dependent transmission lines in electromagnetic transient simulations (1982) IEEE Trans on Power Apparat Syst, 101 (1), pp. 147-155. , PAS-Dommel, H.W., (1989) Electromagnetic Transients Program Reference Manual (EMTP Theory Book), , University of British Columbia: Vancouver, Canada, Department of Electrical EngineeringMingli, W., Yu, F., Numerical calculations of internal impedance of solid and tubular cylindrical conductors under large parameters (2004) IEE Proc Gener Transm Distrib, 151 (1), pp. 67-72Sarto, M.S., Scarlatti, A., Holloway, C.L., On the use of fitting models for the time-domain analysis on problems with frequency-dependent parameters (2001) Proceedings of IEEE International Symposium on Electromagnetic Compatibility, pp. 13-17. , Montreal, Quebec, CanadaAugustGustavsen, B., Semlyen, A., Rational approximation of frequency domain response by vector fitting (1999) IEEE Trans on Power Delivery, 14 (3), pp. 1052-1061Gómez, P., Uribe, F.A., The numerical Laplace transform: An accurate technique for analysing of electromagnetic transients on power system devices (2009) Int J Electr Power Energy Syst, 31 (23), pp. 116-123Wedepohl, L.M., Nguyen, H.V., Frequency-dependent transformation matrices for untransposed transmission lines using newton-raphson method (1996) IEEE Transactions on Power Systems, 11 (3), pp. 1538-1546Budner, A., Introduction of frequency-dependent line parameters into an electromagnetic transients program (1970) IEEE Trans on Power Apparat Syst, 89 (1), pp. 88-97Noda, T., Nagaoka, N., Ametani, A., Phase domain modelling of frequency-dependent transmission lines by means of an ARMA model (1996) IEEE Trans Power Delivery, 11 (1), pp. 401-411Tavares, M.C., Pissolato, J., Portela, C.M., New multiphase mode domain transmission line model (1999) International Journal of Electrical Power and Energy Systems, 21 (8), pp. 585-601. , PII S014206159900023XFaria, J.A.B., Mendez, J.B., Modal analysis of untransposed bilateral three-phase lines - A perturbation approach (1997) IEEE Trans Power Delivery, 12 (1)Kurokawa, S., Filho, J.P., Tavares, M.C., Portela, C.M., Prado, A.J., Behavior of overhead transmission line parameters on the presence of ground wires (2005) IEEE Transactions on Power Delivery, 20 (2), pp. 1669-1676. , DOI 10.1109/TPWRD.2004.833916Gustavsen, B., Validation of frequency-dependent transmission line models (2005) IEEE Transactions on Power Delivery, 20 (2), pp. 925-933. , DOI 10.1109/TPWRD.2004.83767

Proposal Of A Dedicated Telemetry Device For Real-time And Remote Measurements

This work aims to demonstrate an application of telemetry for monitoring process variables. The authors developed the prototype of a dedicated device capable of multiplexing, encoding and transmitting real-time data signals via amplitude-shift keying modulation to remotely located device(s). The prototype development is described in details, enabling the reproduction of the proposed telemetry system for a three-phase motor as well as for other devices. Furthermore, the proposed device has an easy implementation by using of accessible components and low cost, also presenting a tutorial and educational purpose. © 2011 IEEE.25522557HiRain Technologies,Beijing Techshine Technology Co., Ltd.,Beijing Smartmotion System Technology Inc.,Beijing Zhong Ke Fan Hua M and C Technology Co., Ltd.Korber, H.J., Wattar, H., Scholl, G., Modular wireless real-time sensor/actuator network for factory automation applications (2007) IEEE Transactions on Industrial Informatics, 3 (2), pp. 111-119Bin Lu, V., Gungor, C., Online and remote motor energy monitoring and fault diagnostics using wireless sensor networks (2009) IEEE Transactions on Industrial Electronics, 56 (11), pp. 4651-4659Wang, D.-H., Liao, W.-H., Wireless transmission for health monitoring of large structures (2006) IEEE Transactions on Instrumentation and Measurement, 55 (3), pp. 972-981Hong, C., Liu, M., Hao, W., Yi, C., Jia, C., Chun, Z., Wang, Z., Low-power circuits for the bidirectional wireless monitoring system of the orthopedic implants (2009) IEEE Transactions on Biomedical Circuits and Systems, 3 (6), pp. 437-443Ulukus, S., Yates, R.D., Stochastic power control for cellular radio systems (1998) IEEE Transactions on Communications, 46 (6), pp. 784-798Sedra, A.S., Smith, K.C., (2004) Microelectronic Circuits, , New York: Oxford USA TradeHashid, M.H., (2000) Eletrônica de Potência, , São Paulo: Prentice Hall BrasilPhilips Semiconductors Product Specification, , High-speed Diodes 1N4148 datasheetSTmicroeletronics Semiconductors Product Specifications, , IRF740 channel N - MOSFET transistor datasheetComchip Semiconductors Product Specifications, , 1N4733A Zener diode datasheetPhilips Semiconductors Product Specifications, , LM324 Low Power Quad op amps datasheetNational Semiconductors Product Specifications, , LM7812 and LM7805 3-Terminal Positive Voltage Regulators datasheetIntersil Semiconductors Product Specifications, , ADC0804 8-bit Microprocessor-Compatible A/D Converters datasheetEncoder MC145026 Datasheet, , Freescale Semiconductor Inc. Product SpecificationsMaxim Integrated Products, , MAX1472 ASK Transmitter datashee