skip to: page content | links on this page | site navigation | footer (site information)

Fakultet elektrotehnike, strojarstva i brodogradnje, Sveučilište u Splitu

Dr. sc. Petar Sarajčev

Fotografija

Zvanje: Izvanredni profesor

Ime i prezime: Petar Sarajčev

Mjesto: Split

Županija: Splitsko - Dalmatinska

Država: Hrvatska

 

Obrazovanje

  • [1991 - 1995] Srednja škola, Split, Hrvatska
    • IV. gimnazija "Marko Marulić" (prirodoslovno - matematički smjer)
  • [1995 - 2002] Sveučilište u Splitu, Split, Hrvatska
    • Dodiplomski studij elektrotehnike na Fakultetu elektrotehnike, strojarstva i brodogradnje (FESB), smjer: Elektroenergetika, usmjerenje: Elektroenergetski sustavi
    • Diplomski rad: Naponska i strujna naprezanja samonosivog optičkog kabela ovješenog na stupove visokonaponskog voda, obranjen 03. svibnja 2002. godine
    • Mentor: Dr. sc. Matislav Majstrović, red. prof. (Energetski institut "Hrvoje Požar")
  • [2003 - 2008] Sveučilište u Splitu, Split, Hrvatska
    • Poslijediplomski studij elektrotehnike na Fakultetu elektrotehnike, strojarstva i brodogradnje (FESB), smjer: Elektroenergetika
    • [2005 - 2008] Doktorski studij elektrotehnike na Fakultetu elektrotehnike, strojarstva i brodogradnje (FESB), smjer: Elektroenergetika
    • Doktorska disertacija: Elektromagnetski model sustava vodiča u višeslojnom sredstvu, obranjena 15. travnja 2008. godine. Mentor: Dr. sc. Slavko Vujević, red. prof.

Nagrade

  • [2003] Hrvatsko energetsko društvo (HED)
    • Godišnja nagrada "Hrvoje Požar" u kategoriji posebno istaknutog diplomskog rada iz područja energetike

Profesionalno iskustvo

  • [2002 - 2003] Fakultet elektrotehnike, strojarstva i brodogradnje, Sveučilišta u Splitu
    • Honorarni asistent na Zavodu za elektroenergetiku, Katedri za električne mreže i postrojenja iz sljedećih kolegija: Elementi električnih postrojenja, Električna postrojenja, Elektrane, Upravljanje i zaštita električnih postrojenja. Vodi auditorne vježbe i laboratorijske vježbe.
  • [2004-2008] Fakultet elektrotehnike, strojarstva i brodogradnje, Sveučilišta u Splitu
  • [2009-2011] Sveučilišni odjel za stručne studije, Sveučilišta u Splitu
    • [2009 - 2011] Stručni studij Elektroenergetike. Vodi nastavu iz kolegija Tehnika visokog napona.
  • [od 2009] Fakultet elektrotehnike, strojarstva i brodogradnje, Sveučilišta u Splitu
    • [2009 - 2012] Docent na Zavodu za elektroenergetiku, Katedri za električne mreže i postrojenja.
    • [od 2012] Izvanredni profesor na Zavodu za elektroenergetiku, Katedri za električne mreže i postrojenja.

Znanstveni projekti

Znanstvene radionice

  • COST 286: Electromagnetic Compatibility (EMC) in Diffused Communications Systems
    • Workshop: Impact of Communications Technology to EMC, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 12. - 13. December, 2005, Split, Croatia.
    • Vujević, S.; Sarajčev, P.; Petrović, J.: "TLM Model for the Lightning Transient Analysis of the GSM Base Station".

Recenzije za časopise

  • Electric Power Components and Systems (EPCS) - Taylor & Francis Group
  • European Transactions on Electrical Power (ETEP) - Wiley
  • IEEE Transactions on Electromagnetic Compatibility - IEEE
  • Energy Conversion and Management - Elsevier
  • Progress in Electromagnetics Research (PIER / JEMVA)
  • International Journal of Electrical Power and Energy Systems - Elsevier
  • Journal of Engineering, Design and Technology - Emerald
  • Modern Applied Science - Canadian Center of Science and Education
  • Wind Energy - Wiley

Član uređivačkog odbora časopisa

  • American Journal of Electrical and Electronic Engineering (AJEEE)

Članstvo u stručnim udrugama

  • Hrvatski ogranak međunarodnog vijeća za velike elektroenergetske sustave (HRO CIGRE)
  • The Institute of Electrical and Electronics Engineers, Inc. (IEEE)

Strani jezici

  • napredni engleski
  • osnovni talijanski

Slobodne aktivnosti

  • jedrenje Između ostalog završen osnovni, napredni i navigacijski tečaj škole jedrenja Ultra sailing, kao i navigacijski tečaj (krstarenje) škole jedrenja ANA (Adriatic Nautical Academy). Član posade FESB-a na regati: "Jedriličarski kup Splitskog sveučilišta", 2004. i 2005. godine.

 

Znanstveni i stručni članci (59)

 

Pozvana predavanja (1)

  1. Sarajčev, P; Vujević, S.: A Review of Methods for Grounding Grid Analysis,  International Conference on Software Telecommunications and Computer Networks (SoftCOM 2009), Symposium on Environmental Electromagnetic Compatibility (EEMC), 24. - 26. September, Split, Croatia, 2009.

Članci objavljeni na domaćim konferencijama / časopisima (19)

Časopisi (4)

  1. Majstrović, M; Sarajčev, P.: Naponske prilike uzduž samonosivog optičkog kabela ovješenog na stupove visokonaponskog voda, Energija (3), Zagreb, Lipanj 2003.
  2. Sarajčev, P.; Sarajčev, I.; Vujević, S.: Određivanje međusobnog otpora uzemljenja bliskih uzemljivača, Energija, Vol. 57, No. 4, pp. 440-451, 2008.
  3. Sarajčev, P.: Određivanje matrice koeficijenata redukcije sustava kabelskih vodova, Energija, Vol. 58, No. 3, pp. 308-323, 2009.
  4. Sarajčev, P.: Određivanje otpora mjerodavnih za gubitke snage u ekranima jednožilnih kabela, Energija, 2011. (prihvaćeno za objavu)

Konferencije (15)

  1. Sarajčev, I.; Kosor, R.; Sarajčev, P.: Doprinos izboru podešenja visoko podesive nadstrujne zaštite u distribucijskim mrežama, HK Cigre, Cavtat, 2003.
  2. Majstrović, M; Sarajčev, P.: Napon na suhoj zoni samonosivog optičkog kabela ovješenog na stupove srednjenaponskog i visokonaponskog voda, HK Cigre, Cavtat, 2003.
  3. Sarajčev, I.; Kosor, R.; Sarajčev, P.: Problematika slabo izdašnog izvora u distribucijskoj mreži sa stanovišta njene relejne zaštite, HK Cigre, Cavtat, 2004.
  4. Majstrović, M.; Sarajčev, P.: Utjecaj privremenih prenapona na iznos napona na suhoj zoni ADSS optičkog kabela ovješenog na stupovima visokonaponskog voda, HK Cigre, Cavtat, 2005.
  5. Sarajčev, I.; Tadin, F.; Sarajčev, P.: Problematika uzemljenja podmorskog svjetlovodnog kabela, HK Cigre, Cavtat, 2005.
  6. Majstrović, M.; Majstrović, G.; Sarajčev, P.; Dizdarević, N.; Bajs, D.: Analiza napona na isključenoj trojki dvosistemskog dalekovoda pomoću programskog paketa DVDV, HK Cigre, Cavtat, 2005.
  7. Majstrović, M.; Majstrović, G.; Sarajčev, P.; Bajs, D.: Naponske i strujne prilike na isključenoj trojki dvosistemskog dalekovoda, Međunarodna konferencija: "The Year of Nikola Tesla", Hrvatska akademija tehničkih znanosti, Zagreb, Hrvatska, lipanj 2006.
  8. Sarajčev, I.; Sarajčev, P.: Redukcijsko djelovanje kompenzacijskih vodiča u sustavu jednožilnih kabela s metalnim ekranima uzemljenim samo na jednom kraju, HK CIGRE, 4. - 8. Studeni, Cavtat, 2007.
  9. Sarajčev, I.; Sarajčev, P.; Tomić, G.; Visković, Z.: Mogućnost prorade zaštite od premoštenja malog djelatnog otpornika u distribucijskoj mreži usljed kvarova sa zemljom u incidentnoj prijenosnoj mreži, HK CIGRE, 4. - 8. Studeni, Cavtat, 2007.
  10. Sarajčev, I.; Sarajčev, P.: Prilog modeliranju dolaznog putnog vala u proračunima prenapona, HK CIGRE, 4. - 8. Studeni, Cavtat, 2007.
  11. Sarajčev, P.: Brza procjena koeficijenata međunapajanja pri izboru podešenja distantne zaštite, 9. savjetovanje HRO CIGRE, 8. - 12. Studeni, Cavtat, 2009.
  12. Sarajčev, P.; Zelić, I.: Rješenje sustava napajanja tunelske TS 10/0,4 kV pri sanaciji dovodnih tunela RHE Velebit, HE Orlovac i HE Zakučac, 9. savjetovanje HRO CIGRE, 8. - 12. Studeni, Cavtat, 2009.
  13. Sarajčev, P.; Rajić, I.: Analize stanja na isklopljenoj trojci jednožilnih kabela dvosistemskog kabelskog voda, B1-11, 10. Savjetovanje HRO CIGRE, 6. - 10. Studeni, Cavtat, 2011.
  14. Sarajčev, P.; Jasprica, A.: Analiza broja ispada VN dalekovoda usljed izravnih udara groma u fazni vodič, B2-01, 10. Savjetovanje HRO CIGRE, 6. - 10. Studeni, Cavtat, 2011.
  15. Sarajčev, P.: Analiza privremenih prenapona vjetroparka za potrebe izbora odvodnika prenapona, C4-01, 10. Savjetovanje HRO CIGRE, 6. - 10. Studeni, Cavtat, 2011.

Članci objavljeni na međunarodnim konferencijama / časopisima (39)

Časopisi (25)

  1. Vujević, S.; Sarajčev, P.: 2D BEM Analysis of Power Cables Thermal Field, Engineering Modelling, Vol. 19, 1-4, pp. 87-94, 2006.
  2. Vujević, S.; Sarajčev, P.: Dangerous Voltages due to Direct Lightning Strike into the Communication Tower, Journal of Communications Software and Systems, Volume 3, No. 1, pp. 44-51, 2007.
  3. Vujević, S.; Sarajčev, P.: Potential distribution for a harmonic current point source in horizontally stratified multilayer medium, COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Vol. 27, No. 3, pp. 624-637, 2008. 
  4. Vujević, S.; Sarajčev, P.; Sarajčev, I.: Monte Carlo Based Efficiency Assessment of Lightning Protection System, International Review of Electrical Engineering (IREE), Vol. 3, No. 2, pp. 225-232, 2008.
  5. Sarajčev, P.; Vujević, S.: Grounding Grid Analysis: Historical Background and Classification of Methods, International Review of Electrical Engineering (IREE), Vol. 4, No. 4, pp. 670-683, 2009.
  6. Srajčev, P.; Sarajčev, I.; Goić, R.: Transient EMF induced in LV cables due to wind turbine direct lightning strike, Electric Power Systems Research (EPSR), Vol. 80, No. 4, pp. 489-494, 2009.
  7. Vujević, S.; Boras, V.; Sarajčev, P.: A Novel Algorithm for Internal Impedance Computation of Solid and Tubular Cylindrical Conductors, International Review of Electrical Engineering (IREE), Vol. 4, No. 6, Part B, pp. 1418-1425, 2009.
  8. Sarajčev, P.; Goić, R.: An EMTP Model for Lightning Surge Analysis of Wind Farms, International Review on Modelling and Simulations (IREMOS), Vol. 3, No. 1, pp. 70-81, 2010.
  9. Vujević, S.; Lovrić, D.; Sarajčev, P.: Comparison of 2D algorithms for the computation of power line electric and magnetic fields, European Transactions on Electric Power (ETEP), Vol. 21, No. 1, pp. 505-521, 2010. DOI: 10.1002/etep.457
  10. Sarajčev, P.; Goić, R.: Parametric Analysis of Lightning Stroke Incidence to HV Transmission Line Towers, European Transactions on Electric Power (ETEP), Vol. 21, No. 1, pp. 541-554, 2010. DOI: 10.1002/etep.460
  11. Sarajčev, P.: A Review of Statistics on Lightning Currents in Relation to the Lightning Incidence of New-Generation Wind Turbines, International Review of Electrical Engineering (IREE), Vol. 5, No. 3, Part B, pp. 1285-1296, 2010. 
  12. Sarajčev, P.; Goić, R.: Lightning Incidence of Wind Farm Underground Power Cable Networks, International Review of Electrical Engineering (IREE), Vol. 5, No. 3, Part B, pp. 1244-1254, 2010.
  13. Sarajčev, P.; Goić, R.: Power Loss Computation in High Current Generator Bus Ducts of Rectangular Cross Section, Electric Power Components and Systems (EPCS), Vol. 38, No. 13, pp. 1469-1485, 2010. DOI: 10.1080/15325001003735192
  14. Sarajčev, P.: Wind Farm Surge Arresters Energy Capability and Risk of Failure Analysis, International Review on Modelling and Simulations (IREMOS), Vol. 3, No. 5, Part A, pp. 926-937, 2010.
  15. Sarajčev, P.; Goić, R.: Assessment of the backflashover occurrence rate on HV transmission line towers, European Transactions on Electrical Power, Vol. 22, No. 2, pp. 152-169, 2011, DOI: 10.1002/etep.552
  16. Sarajčev, P.; Goić, R.: A Review of Current Issues in State-Of-Art of Wind Farm Overvoltage Protection, Energies, Special Issue: Wind Energy 2011, Vol. 4, No. 4, pp. 644-668, 2011, doi: 10.3390/en4040644
  17. Sarajčev, P.; Vujević, S.; Lovrić, D.: Time-harmonic current distribution on conductor grid in horizontally stratified multilayer medium, Progress In Electromagnetics Research B (PIER B), Vol. 31, pp. 67-87, 2011.
  18. Sarajčev, P.; Goić, R.: Assessment of lightning current parameters suitable for wind turbine overvoltage protection analysis, Wind Energy, Vol. 15, No. 4, pp. 627-644, 2011, DOI: 10.1002/we.496
  19. Vujević, S.; Sarajčev, P.; Lovrić, D.: Time-harmonic analysis of grounding system in horizontally stratified multilayer medium, Electric Power Systems Research (EPSR), Vol. 83, No. 1, pp. 28-34, 2012, DOI: 10.1016/j.epsr.2011.09.008
  20. Sarajčev, P.: Numerical Analysis of the Magnetic Field of High-Current Busducts and GIL Systems, Energies, Vol. 4, No. 12, pp. 2196-2211, 2011.
  21. Sarajcev, P.: Analysis of Electromagnetic Influences Concerning Two Adjacent Parallel High-current Bus Ducts, Electric Power Components and Systems (EPCS), Vol. 40. No. 8, pp. 829-844, 2012, DOI: 10.1080/15325008.2012.666614
  22. Vujević, S.; Balaž, Z.; Modrić, T.; Sarajčev, P.: Hybrid Model for Analysis of Ground Fault Current Distribution, International Review of Electrical Engineering (IREE), Vol. 7, No. 2, pp. 4035-4045, 2012.
  23. Sarajčev, P.; Vasilj, J.; Goić, R.: Analysis of Lightning Surge Transference Through Three-Phase Step-Up Transformers, International Review of Automatic Control (IREACO), Vol. 5, No. 5, pp. 575-583, 2012.
  24. Sarajcev, P.; Vasilj, J.; Goic, R.: Monte Carlo analysis of wind farm surge arresters risk of failure due to lightning surges, Renewable Energy, Volume 57, pp. 626-634, 2013. http://dx.doi.org/10.1016/j.renene.2013.03.004
  25. Sarajcev, P.; Martinac, I.; Radic, Z.: Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems, American Journal of Electrical and Electronic Engineering, Vol. 1, No. 2, pp. 23-31, 2013, DOI: 10.12691/ajeee-1-2-2.

Konferencije (14)

  1. Medić, I; Majstrović, M.; Sarajčev, P.: Calculation of earthing and screening effects of compensation conductor laid alongside underground multi-cable power lines, Wessex Electrocomp, Split, 2003.
  2. Vujević, S.; Sarajčev, P.; Lucić, R.: Computing the mutual impedances between segments of earthing system conductors, Computational Methods and Experimental Measurements XII, Transactions on Modelling and Simulation Volume 41, Online ISSN: 1743-355X, edited by: C.A.Brebbia, Wessex Institute of Technology, UK and G.M.Carlomagno, University of Naples, Italy, published: 2005.
  3. Vujević, S.; Lucić, R.; Sarajčev, P.: Linear Circuit Analysis Using Finite Element Technique, XIII International Symposium on Theoretical Electrical Engineering ISTET '05, Lviv, Ukraine, 2005.
  4. Vujević, S.; Sarajčev, P.; Sarajčev, I.: EMTP modelling of direct lightning strikes to the GSM base station tower, International Conference on Software Telecommunications and Computer Networks (SoftCOM 2005), Marina Frapa, Rogoznica, Croatia, 2005.
  5. Vujević, S.; Sarajčev, P.: An EMTP Extension for Computing Earthing System Transient Step and Touch Voltages, Transient Phenomena in Large Electric Power Systems, CIGRE Symposium, 18. - 21. April, Zagreb, 2007.
  6. Vujević, S.; Sarajčev, P.; Sarajčev, I.: Stochastic Assessment of External LPS of Structures, 29th International Conference on Lightning Protection (ICLP 2008), 23. - 26. June, Uppsala, Sweden, 2008. 
  7. Sarajčev, I.; Sarajčev, P.; Vujević, S.: Mathematical Model of Lightning Stroke Development, International Conference on Software Telecommunications and Computer Networks (SoftCOM 2008), 25. - 27. September, Split, Croatia, 2008.
  8. Vujević, S.; Sarajčev, P.; Botica, A.: Computation of the Overhead Power Line Electromagnetic Field, International Conference on Software Telecommunications and Computer Networks (SoftCOM 2008), 25. - 27. September, Split, Croatia, 2008.
  9. Vujević, S.; Sarajčev, P.; Lovrić, D.: Efficiency Assesment of the External Lightning Protection System, 9th International Conference on Applied Electromagnetics (PES 2009), 31. 08. - 02. 09., Niš, Serbia, O5-4, pp. 1-4, 2009.
  10. Vujević, S.; Sarajčev, P.; Lovrić, D.: Computation of the Power Line Electric and Magnetic Fields, 17th Telecommunication forum TELFOR 2009, 24. - 26. November, Beograd, Serbia, S8-10, pp. 875-878, 2009.
  11. Sarajčev, P.: Assessment of Lightning Current Prameters Suitable for Analysis of HV Substation Overvoltage Protection, 30th International Conference on Lightning Protection (ICLP 2010), Paper No. 1001, 13 - 17 September, Cagliari, Italy, 2010.
  12. Lovrić, D.; Vujević, S.; Sarajčev, P.: Accuracy of the Inverse Fast Fourier Transform Algorithm in Grounding Grid Transient Analysis, 20th International Conference on Applied Electromagnetics and Communications (ICECom 2010), 20 - 23. September, Dubrovnik, Croatia, 2010.
  13. Sarajčev, P.: Assessment of Lightning Stroke Incidence to Modern Wind Turbines, 18th International Conference on Software, Telecommunications and Computer Networks (SoftCOM 2010), Symposium on Environmental Electromagnetic Compatibility,  23 -  25. September, Bol, Croatia, 2010.
  14. Sarajčev, P.: Assessment of Lightning Stroke Incidence to Underground Power Cables, 18th International Conference on Software, Telecommunications and Computer Networks (SoftCOM 2010), Symposium on Environmental Electromagnetic Compatibility,  23 -  25. September, Bol, Croatia, 2010.

Grounding Grid Analysis: Historical Background and Classification of Methods This paper presents a review of the most important methods available for the grounding grid analysis. This includes numerical methods intended for the grounding grid direct current, time-harmonic current and transient current energization. Emphasis is given to the numerical methods involving transient grounding grid analysis. Available numerical methods are reviewed according to the implemented soil model, e.g. homogenous soil, horizontally and vertically stratified multilayer soil as well as exceptionally heterogeneous soil. In that regard, various possible treatments of the boundary between soil layers are discussed. Here, image methods feature prominently in a solution to this problem. Whence, several possible image methods are reviewed. Additionally, numerical methods are reviewed according to the theoretical background approach. Here, one can make a clear distinction between circuit approach, which might include a transmission line approach, and electromagnetic theory approach. Numerical methods for the transient analysis of grounding grids are also reviewed in regard to the domain of the solution. Therefore, they could be regarded as time domain and frequency domain methods. Fast Fourier transform algorithm is seen as a conventional way of crossing between frequency and time domains. Major advantages and disadvantages of both approaches are pointed out as well.

Određivanje matrice koeficijenata redukcije sustava kabelskih vodova U radu su prezentirane izvorne teorijske podloge matematičkog modela za određivanje matrice koeficijenata redukcije sustava kabelskih vodova. Riječ je o novom i posve općenitom matematičkom modelu koji može uvažiti proizvoljan broj i raspored sustava jednožilnih kabela složenih u trokutnom snopu. Dotična matrica koeficijenata redukcije uračunava, naime, stvarni (potpuni) elektromagnetski utjecaj koji vlada među pripadnim kabelskim vodovima, u uvjetima nastupa jednopolnoga kratkog spoja. Za matricu koeficijenata redukcije značajno je da njeni elementi ovise isključivo o elektromagnetskim i geometrijskim značajkama samih kabelskih vodova, o njihovom smještaju te o geofizikalnim svojstvima njihove trase, kao i o frekvenciji struja koje teku kabelskim vodovima. Primjena ovdje razvijenog modela omogućava daleko točniji proračun raspodjele struja u sustavu kabelskih vodova nego li je to moguće primjenom pojedinačnih faktora redukcije nazočnih kabelskih vodova. Istodobno, razvijeni model je jednostavan za primjenu i posve općenit. Primjena prezentirane teorije i razvijenog matematičkog modela prikazana je i na primjeru općeg sustava kabelskih vodova nazivnog napona 110 kV.

Potential distribution for a harmonic current point source in horizontally stratified multilayer medium This paper describes a numerical procedure for approximating the potential distribution for a harmonic current point source, which is either buried in horizontally stratified multilayer earth, or positioned in the air. The procedure is very efficient and general. The total number of layers and the source position in relation to the medium model layers are completely arbitrary. The efficiency of the computation procedure is based on the successful application of the numerical approximation of two kernel functions of the integral expression for the potential distribution within an arbitrarily chosen layer of the medium model. Each kernel function of the observed layer is approximated using a linear combination of 15 real exponential functions. Using these approximations and the analytical integration based on the Weber integral, a simple expression for numerical approximation of potential distribution within boundaries of the observed medium layer is given. Potential retardation is taken into account approximately. Numerical model developed for the harmonic current point source is the basis of a wider numerical model for computation of the harmonic and transient fields of earthing system, which consists of earthing grids buried in horizontally stratified multilayer earth and metallic structures in the air.

Dangerous voltages due to the direct lightning strike into the communication tower This paper presents a novel technique for computing dangerous voltages due to direct lightning strike into the communication tower and associated earthing system, which is based on the use of the well-known ATP-EMTP software package. The earthing grid and the communication tower structure are approximated by the circular cross section conductors. In numerical model, conductors are subdivided into segments (1D finite elements) and Clark's model with distributed constant parameters is then applied. Because of the limitations of ATP-EMTP software package , the leakage resistance of buried segments is modelled as additional lumped parameter. Analytical expressions for distributed and lumped segment parameters are derived using the average potential method. Mutual electromagnetic coupling between segments is neglected due to the limitations imposed by the ATP-EMTP software package, which is based on transmission line approach. Separate computer program is developed for obtaining the earth surface transient potential distribution, from which step and touch voltages are then computed.

EMTP Modelling of Direct Lightning Strikes to the GSM Base Station Tower This paper presents a numerical model for the GSM base station electromagnetic transient analysis. The model is based on the use of the well-known ATP-EMTP computer program. A complete GSM base station tower model combined with a detailed model of the base station earthing grid is proposed. A distributed parameters line model is employed, with Heidler's type surge current source representing direct lightning strike to the GSM base station tower. A new analytical expressions for distributed parameters of the Clark's model are derived using the average potential method.

Analiza napona na isključenoj trojki dvosistemskog dalekovoda pomoću programskog paketa DVDV Sigurnost izvoditelja radova na isključenoj trojci dvosistemskog voda direktno ovisi o iznosu napona na mjestu radova. Inducirani naponi posljedica su elektromagnetske indukcije i elektrostatskog djelovanja. U ovom radu prezentirat će se programski paket DVDV ver. 1.0 za analizu induciranih napona na isključenim trojkama dvosistemskih dalekovoda razvijen u Energetskom institutu Hrvoje Požar, kao i dio rezultata dobivenih pomoću DVDV-a za primjer DV 2 x 220 kV Konjsko - Bilice.

Naponske prilike uzduž samonosivog optičkog kabela ovješenog na stupove visokonaponskog voda U novije vrijeme došlo je do demonopolizacije u elektroenergetskom i telekomunikacijskom sektoru, što je dodatno otežalo dobivanje novih ili proširenje postojećih koridora. Zbog toga se sve češće optički kabeli postavljaju na stupove visokonaponskih vodova. Ovi kabeli se nalaze u jakom električnom polju, pa svako onečišćenje njihovog plašta može dovesti do oštećenja istih. U članku se analiziraju naponske i strujne prilike uzduž onečišćenog plašta samonosivog optičkog kabela bez metalnih dijelova, koji je ovješen na čeličnorešetkaste stupove visokonaponskog voda. (vidjeti vise...)

Doprinos izboru podešenja visokopodesive nadstrujne zaštite u distribucijskim mrežama U radu je prikazan postupak izbora podešenja "visoko" podesive nadstrujne zaštite s obzirom na moguću promjenu uklopnog stanja distribucijske mreže. Prezentirana je odgovarajuća teorijska podloga izbora podešenja. Ona je primjenjena na jednom primjeru distribucijske mreže 35 kV. (vidjeti vise...)

Napon na suhoj zoni samonosivog optičkog kabela ovješenog na stupove srednje naponskog i visokonaponskog voda Demonopolizacija u elektroenergetskom i telekomunikacijskom sektoru je svjetski proces koji ima svojih pozitivnih i negativnih reperkusija na život čovjeka, kako s tehničkog tako i s ekološkog aspekta. Jedan negativni aspekt je, među ostalim i otežano dobivanje novih ili proširenje postojećih koridora. Zbog toga se sve češće optički kabeli postavljaju na stupove visokonaponskih vodova. Ovi kabeli su samonosive konstrukcije bez metalnih dijelova i nalaze se u jakom električnom polju. U ovom radu se analiziraju naponi na suhim zonama onečišćenog plašta samonosivog optičkog kabela bez metalnih dijelova koji je ovješen na stupove srednjenaponskog i visokonaponskog voda. Ovi naponi mogu ošteti optički kabel ili prouzročiti neke druge neželjene posljedice. (vidjeti vise...)

Problematika slabo izdašnog izvora u distribucijskoj mreži sa stanovišta njene relejne zaštite U radu se prikazuje problematika slabo izdašnog izvora u distribucijskoj mreži sa stanovišta njene relejne zaštite. Naime, nazočnost dotičnog izvora u distribucijskoj mreži utječe na izbor i podešenje relevantne relejne zaštite. Spomenuta problematika se razmatra na primjeru dijela distribucijske mreže 35 kV Elektrojuga na koju je priključena HE "Zavrelje".

Computing the mutual impedances between segments of earthing system conductors Electromagnetic model of the non-equipotential large earthing systems at power frequency includes transversal and longitudinal mutual impedances between segments of earthing conductors. This paper describes a new algorithm for computing the mutual impedances. Because the integrand contains a singularity and involves a double integration, the integral expressions for mutual impedances are subdivided into two terms. The first term can be computed as the solution of an analytic expression. The second term is not singular and can be evaluated by a new numerical integration routine, which is based on seven-point numerical integration with Gauss-Legendre quadrature. (vidjeti vise...)

Linear circuit analysis using finite element technique This paper describes a very simple but powerful numerical algorithm for the steady – state as well as transient linear electrical circuit analysis. The proposed numerical algorithm is based on a finite element technique (FET). On the basis of presented theory, a MATLAB program was developed and then applied for the transient linear circuit analysis on the concrete linear electrical circuit example with known exact analytical solution.
| Webmaster | Copyright © 2004 - 2009 Katedra za Elektricne mreze i Postrojenja