Education

• [1991 - 1995] High scool degree, Split, Croatia
  • IV. gymnasium "Marko Marulić" (secondary school of mathematical specialization)

• [1995 - 2002] University of Split, Split, Croatia
  • Undergraduate study at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture (FESB)
  • BS thesis: Current and voltage stresses of self-supporting fiber optic cable installed on pylons of high voltage overhead line, defended on 03. May 2002.
  • Mentor: Professor Matislav Majstrović,Ph. D. (Energy institute "Hrvoje Pozar", Zagreb)

• [2003 - 2008] University of Split, Split, Croatia
  • Postgraduate study at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture (FESB)
  • [2005 - 2008] Ph.D. student at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture (FESB)
  • PhD Thesis: Electromagnetic model of the system of conductors in multilayer medium, defended on 15. April 2008. Mentor: Professor Slavko Vujevic, Ph.D.

Awards

• [2003] Croatian energy society (HED)
  • Annual award "Hrvoje Pozar" in category of specially distinguished BS thesis in the field of electroenergetics.

Professional experience

• [2002 - 2003] Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
  • Part time assistant at the Department of Power Systems, in the following courses: Elements of Electrical Power Substations, Electrical networs, Power plants, Power system guidence and protection. Leading auditorial and laboratorial exercises.

• [2004 - 2008] Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
  • [2004 - 2008] Assistant an the Department of Power Systems, in the following courses: Elements of Electrical Power Substations (leads auditorial exercises, laboratorial exercises, and holds written exams), Power plants (laboratorial exercises ), High voltage engineering (laboratorial exercises), Electrical networks (leads auditorial excersises, laboratorial excersises, and holds written exams), Power system guidance and protection (leads auditorial exercises, laboratorial exercises, and holds written exams), Computer applications in power system analisys (leads auditorial and laboratorial exercises).
  • [2008] Senior Assistant on the Department of Power Systems in same courses.

• [2009-2011] University department of professional studies, University of Split
  
  • [2009 - 2011] Electrical Power Systems: High voltage engineering course.
    

• [since 2009] Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
  
  • [2009 - 2012] Assistant Professor at the Department of Electrical Power Systems.
  • [since 2012] Associate Professor at the Department of Electrical Power Systems.
    

Participation in scientific projects

• [2004 - 2008] Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
  • Electromagnetic influence of electrical power lines and earthing grids 
  • Financed by: Ministry of science and tehnology (Croatia)
  • Project leader: Prof. Slavko Vujević, Ph. D.

• [since 2008] Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
  • Development of advanced algorithms for the electromagnetic modelling
  • Financed by: Ministry of science and tehnology (Croatia)
  • Project leader: Prof. Slavko Vujević, Ph. D.

Participation in scientific workshops

• 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 nad 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".

Journals Peer Review

• 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
  

Journals Editorial Board Member

• American Journal of Electrical and Electronic Engineering (AJEEE)

Membership

• Croatian national commitee of CIGRE (HRO CIGRE) - International Council on Large Electric Systems
• The Institute of Electrical and Electronics Engineers, Inc. (IEEE)

Language

• advanced english
• basic italian

Free time

• sailing Among others, finished basic, advanced and navigational sailing course in the sailing school Ultra sailing, Split , as well as navigational course in sailing school ANA (Adriatic Nautical Academy). Team member of the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in the regatta: "University of Split Sailing Cup ", for the years 2004. and 2005.

 

Scientific & research papers (59)

 

Invited lectures (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.

Domestic publications and conferences (19)

Publications (4)

1. Majstrović, M.; Sarajčev, P.: Dry band arcing voltage on self-supporting fiber optic cable installed on pylons of high voltage overhead line, Journal of Energy (3), Zagreb, 2003.
2. Sarajčev, P.; Sarajčev, I.; Vujević, S.: Determinantion of the mutual ground resistance of adjacent grounding grids, Journal of Energy, Vol. 57, No. 4, pp. 440-451, 2008.
3. Sarajčev, P.: Determination of the power cables system reduction coefficient matrix, Journal of Energy, Vol. 58, No. 3, pp. 308-323, 2009.
4. Sarajčev, P.: Determination of resistances associated with power losses in single-core cable screens, Journal of Energy, 2011. (accepted for publication)

Conferences (15)

1. Sarajčev, I.; Kosor, R.; Sarajčev, P.: Contribution to the parameter selection of the instantenous overcurrent protection in the distribution networks, HK Cigre, Cavtat, Croatia, 2003.
2. Majstrović, M; Sarajčev, P.: Dry-band voltage of self-supporting fiber optic cable installed on pylons of midium and high voltage overhead lines, HK Cigre, Cavtat, Croatia, 2003.
3. Sarajčev, I.; Kosor, R.; Sarajčev, P.: Problems associated with small-scale power plant connected to distribution network from the point of view of relay protection, HK Cigre, Cavtat, Croatia, 2004.
4. Majstrović, M.; Sarajčev, P.: Influence of temporary overvoltages on the dry band arcing on ADSS fiber optic cable instaleed on pylons of high voltage overhead line, HK Cigre, Cavtat, Croatia, 2005.
5. Sarajčev, I.; Tadin, F.; Sarajčev, P.: Grounding of the submarine fiber optic cable, HK Cigre, Cavtat, Croatia, 2005.
6. Majstrović, M.; Majstrović, G.; Sarajčev, P.; Dizdarević, N.; Bajs, D.: Voltage analysis of phase disconnection of double circuit overhead line by DVDV software, HK Cigre, Cavtat, Croatia, 2005.
7. Majstrović, M.; Majstrović, G.; Sarajčev, P.; Bajs, D.: Voltage and current analysis of phase disconnection of double circuit overhead line, International scientific and professional meeting: "The Life and Work of Nikola Tesla", Croatian Academy of Engineering (HATZ) , Zagreb, Croatia, 2006.
8. Sarajčev, I.; Sarajčev, P.: Compensation conductors reduction effects in single-core cable systems with sheaths grounded on single end, HK CIGRE, 4. - 8. November, Cavtat, 2007.
9. Sarajčev, I.; Sarajčev, P.; Tomić, G.; Visković, Z.: Possibility of low-resistance earthed neutral point false relay operation in distribution network due to the earth faults in incident transmission network, HK CIGRE, 4. - 8. November, Cavtat, 2007.
10. Sarajčev, I.; Sarajčev, P.: Contribution to the incoming travelling wave model in overvoltage calculations, HK CIGRE, 4. - 8. November, Cavtat, 2007.
11. Sarajčev, P.: Fast assesment of infeed constants for the distant protection settings calculation, 9th HRO CIGRE Session, 8. - 12. November, Cavtat, Croatia, 2009.
12. Sarajčev, P.; Zelić, I.: Solution of the power supply of the tunnel TS 10/0.4 kV during remediation of the PS HPP Velebit, HPP Orlovac and HPP Zakučac, 9th HRO CIGRE Session, 8. - 12. November, Cavtat, Croatia, 2009.
    
13. Sarajčev, P.; Rajić, I.: Analysis of conditions at disconnected SCC triplet of the double cable line, B1-11, 10. HRO CIGRE Session, 6. - 10. November, Cavtat, Croatia, 2011.
14. Sarajčev, P.; Jasprica, A.: Analysis of shielding failure flashover rates for HV transmission lines, B2-01, 10. HRO CIGRE Session, 6. - 10. November, Cavtat, Croatia, 2011.
15. Sarajčev, P.: Analysis of wind farm temporary overvoltages in regards to surge arrester selection, C4-01, 10. HRO CIGRE Session, 6. - 10. November, Cavtat, Croatia, 2011.
    

International publications and conferences (39)

Publications (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.

Conferences (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, 29-th 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.	Determination of the power cables system reduction coefficient matrix The work presents original theoretical bases of the mathematical model for the determination of the power cables system reduction coefficient matrix. The matter at hand is a new and completely general mathematical model which can take into consideration an arbitrary number and arrangement of a single-core cable system arranged in a treefoil formation. As a matter of fact, the concerned reduction coefficient matrix takes into consideration the real (full) electromagnetic impact which dominates the pertaining power cables, in the conditions of occurrence of one-pole short circuit. The reduction coefficient matrix is characterized by having elements dependant exclusively on electromagnetic and geometrical properties of the very power cables, their positioning and on the geophysical properties of their route, as well as on the frequency of the currents flowing through the power cables. The application of the model deliberated here enables a far more accurate estimation of the current distribution in the power cables system than would be possible by applying separate reduction factors of the present power cables. At the same time, the deliberated model is simple for application and entirely general. The application of the presented theory and the developed mathematical model is also shown on the example of the general system of power cables with nominal voltage 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 TowerThis 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.	Voltage Analysis of Phase Disconection of Double Circuit Overhead Line by DVDV Software Operating security of workmen on the transmission line towers directly depends on inducted voltages. That is especially important for double circuit lines. Inducted voltages are consequence of electromagnetic induction and electrostatics. This paper presents new software package DVDV ver.1.0 developed in EIHP as part of results obtained for the line 2 x 220 kV Konjsko – Bilice. (in Croatian).
Dry-band arcing voltage of self-supporting fiber optic cable installed on pylons of high voltage overhead lineUnbundling of vertically integrated company in power and telecommunication sectors is a worldwide process with positive and negative aspects. It is extremely hard to get new line corridors. All-dielectric self-supporting fiber optic cables are often installed on pylons of high voltage overhead lines. The fiber optic cable is thus located in the high voltage environment. Dry-band voltage of the polluted sheath’s surface of the all-dielectric self-supporting fiber optic cable is analyzed in this paper. (in Croatian).	Contribution to the parameter selection of distribution network instantenous overcurrent protection settings In this paper, the procedure of selecting instantenous overcurrent protection settings is presented, in respect of possible change in distribution network configuration. Appropriate theoretical basis for that selection is given and then applied on 35 kV distribution network example. (in Croatian).
Dry-band voltage of self-supporting fiber optic cable installed on pylons of medium and high voltage overhead lines Unbundling of vertically integrated company in power and telecommunication sectors is a worldwide process with positive and negative aspects. It is extremely hard to get new line corridors. All-dielectric self-supporting fiber optic cables are often installed on pylons of medium and high voltage overhead lines. The fiber optic cable is in the high voltage environment. Dry-band voltage of the polluted sheath’s surface of the all-dielectric self-supporting fiber optic cable is analyzed in this paper. This voltage can cause dry-band arcing. The fiber optic cable can be damaged. (in Croatian).	Problems associated with small-scale power plant connected to distribution network from the point of view of relay protection Problems associated with the presence of small-scale power plant connected to the distribution network from the point of view of relay protection, are presented in this paper. Namely, the presence of such power plant in a distribution network effects both selection and settings of relevant relay protection equipment. Abovementioned problems are considered on a concrete example of 35 kV distribution network which is a part of "Elektrojug", with hydro power plant "Zavrelje" connected to it. (in Croatian).
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.	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.