Papers by Adnan Mujezinović
Nuclear Technology and Radiation Protection, 2020
This paper deals with an advanced electromagnetic radiation approach for analyzing the time-domai... more This paper deals with an advanced electromagnetic radiation approach for analyzing the time-domain performance of grounding systems under pulse excitation currents. The model of the grounding systems presented within this paper is based on the homogeneous Pocklington integro-differential equation for the calculation of the current distribution on the grounding system and Lorentz gauge condition which is used for the grounding system transient voltage calculation. For the solution of the Pocklington integro-differential equation, the indirect boundary element method and marching on-in time method are used. Fur- thermore, the solution technique for the calculation of the grounding system transient voltage is presented. The numerical model for the calculation of the grounding system transients was verified by comparing it with onsite measurement results.
Progress in Organic Coatings
B&H Electrical Engineering
Cathodic protection system is commonly employed approach for the protection of the metallic infra... more Cathodic protection system is commonly employed approach for the protection of the metallic infrastructure placed in electrolyte against corrosion. Adequate design of the cathodic protection system requires the determination of electrical potential and current density distribution on the protected object surface that meets the defined criteria. In this paper, the application of the direct boundary element method in conjunction with Newton-Raphson method was considered for the calculation of the electric potential and current density distribution on the surface of the cathodically protected underground object. The considered method was applied on the sacrificial anode cathodic protection system of the underground pipeline. The non-linear boundary conditions of the electrode surfaces of the cathodic protection system are taken into account. The method was used to determine the current density and electric potential distribution on the external wall of the protected pipeline.
Radiation Protection Dosimetry, Nov 24, 2022
Lecture notes in networks and systems, Oct 16, 2022
B&H Electrical Engineering
This paper introduces and compares the various techniques for identification and analysis of low ... more This paper introduces and compares the various techniques for identification and analysis of low frequency oscillations in a power system. Inter-area electromechanical oscillations are the focus of this paper. After multiresolution decomposition of characteristic signals, physical characteristics of system oscillations in signal components are identified and presented using the Fourier transform, Prony’s method, Matrix Pencil Analysis Method, S-transform, Global Wavelet Spectrum and Hilbert Huang transform (Hilbert Marginal Spectrum) in time-frequency domain representation. The analyses were performed on real frequency signals obtained from FNET/GridEye system during the earthquake that triggered the shutdown of the North Anna Nuclear Generating Station in the east coast of the United States. In addition, according to the obtained results the proposed methods have proven to be reliable for identification of the model parameters of low-frequency oscillation in power systems. The rele...
B&H Electrical Engineering
This paper specifies and compares the ancillary services used by transmission system operators in... more This paper specifies and compares the ancillary services used by transmission system operators in selected countries within ENTSO-E (European Network of Transmission System Operators-Electricity) for operational needs of their transmission systems. The comparison of the ancillary services’ unit prices is also given. In addition, analyses of various experiences gained by ENTSO-E countries within their electric power systems in relation to initiatives supporting the power generation from renewable energy sources (RES) and the methods of their integration into the electric power system were made. Namely, depending on the total amount of RES, depending on the incentive system for electricity production from RES and the development of an organized electricity market, different balancing responsibility models for electricity producers from RES were established.
2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE
In this paper impact of the tower arrangements on the mitigation of the increased values of the e... more In this paper impact of the tower arrangements on the mitigation of the increased values of the electric field intensity at high-voltage transmission line conductors was investigated. Several configurations of high-voltage towers (horizontal, delta, reverse delta, vertical and split-phase configurations) were analyzed. It assumed that the same height of the lowest phase conductors above the ground and the same value of the connected 400 kV voltage. The calculations were carried out for the values of the electric field intensity on the surface of the conductor and its immediate vicinity. A charge simulation method was used to calculate the electric field intensity on the surface of the stranded conductors and their immediate vicinity.
2017 2nd International Multidisciplinary Conference on Computer and Energy Science (SpliTech), 2017
This paper deals with investigation of the impulse characteristics of transmission line tower gro... more This paper deals with investigation of the impulse characteristics of transmission line tower grounding. Investigations of the impulse characteristics of transmission lines tower grounding in this paper are based on experimental analysis conducted on type “A” grounding of transmission line tower. Firstly, paper describes the problem of back-flashover and impact of transmission lines tower grounding impedance on it. Also, experimental investigation of impulse characteristics with different rise time of current wave front on real type “A” grounding are given. Finally, detail analysis of experimental data is given.
2017 XXVI International Conference on Information, Communication and Automation Technologies (ICAT), 2017
State estimation is a basic function, which results are used in almost all other functions for th... more State estimation is a basic function, which results are used in almost all other functions for the analysis, management and planning of distribution networks. The paper describes the process of load calibration that is one of the basic steps in the process of state estimation in the distribution network. Algorithm for state estimation of a radial distribution network used in this paper is based on a modification of the algorithm for load flow calculation. For the calculation of load flow of radial distribution networks “backward-forward” algorithm was used. The developed application for the state estimation is used for state estimation of a real radial distribution network.
2015 XXV International Conference on Information, Communication and Automation Technologies (ICAT), 2015
This paper deals with method for evaluation of quality of the impulse high voltage measuring syst... more This paper deals with method for evaluation of quality of the impulse high voltage measuring system. The purpose of assessing the quality of the impulse high voltage measurement system is to determine whether the measurement system is suitable for use in the appropriate measurements. Firstly, paper describes components of impulse high voltage measuring system. Main characteristics of measuring systems used for evaluation of quality of impulse high voltage measuring system are explained in detail for the characteristics of the measuring system. Finally, test method based on the comparative experimental and numerical analysis is given.
This paper presents measuring results of transferred overvoltages in the secondary circuits of in... more This paper presents measuring results of transferred overvoltages in the secondary circuits of instrument transformers caused by switching operations of disconnector in air insulated substations 220 kV, in Bosnia and Herzegovina. Obtained results show that the maximum amplitude of these overvoltages can be up to 940 Vpeak (220 kV hydroelectric power plant Grabovica). In order to ensure electromagnetic compatibility it is necessary to adequately damp high overvoltages by instrument transformer, or to use some of the measures for reducing transferred overvoltages in secondary circuits. The conducted measurements show that in case of using unshielded secondary cables on current transformer terminals, overvoltages are much higher than in case of using shielded cables (3.7 times higher in measuring core and 6.1 times higher in protective core). Paper gives suggestions for eliminating the causes of interference, reducing coupling on the path of signal transmission and increasing protectio...
High Performance and Optimum Design of Structures and Materials, 2014
This paper analyzes the phenomenon of potentials deviation (ON/OFF potentials) as a result of cha... more This paper analyzes the phenomenon of potentials deviation (ON/OFF potentials) as a result of changes in the soil resistivity, when applying cathodic protection systems with galvanic anodes on PCCP (pre-stressed concrete cylinder pipes) in ambient desert conditions. Measurement of ON and OFF potentials on a long section with different values of the soil resistivity have shown that there are great deviations in parts of sections which are proportional to the measured values of the soil resistivity. Analyzing the changes in a value of IR drop show that the ON potential changes very little in the case of high values of the soil resistivity, as well as that on these sections, a high value of IR drop appear, i.e. great change OFF potential. Over time, this difference between the ON and OFF potentials in these sections decreases and this is a case of a full polarization of PCCPs. If the value of the electrical soil resistivity is relatively low, it can be concluded that the IR drop is negligible.
2014 International Symposium on Electromagnetic Compatibility, 2014
In the paper the results of measurements of voltages and electric fields of extra low frequency (... more In the paper the results of measurements of voltages and electric fields of extra low frequency (ELF) below 400 kV transmission lines in Bosnia and Herzegovina (B&H) are presented. In the high-voltage network in B&H there were registered a significant number of power frequency overvoltages in the regime of small loads after its reconnection in common energy system UCTE (Union for the Coordination of Transmission System Operators for Electricity), and today ENTSO-E (European Network of Transmission System Operators for Electricity) in October 2004. Increased voltages in the high-voltage network causes increase in the value of electric field and exposure of human bean to electric fields. On the other hand, high voltages in the network causes higher power losses due to AC corona. Therefore, it is important to determine the value of electric field in the vicinity of high-voltage lines to assess their effects on people and equipment as well as value of electric field at increased voltages to accurate determined power losses due to AC corona. The results of measurements of electric fields in the spatial profiles at 1, 2 and 3 meters above ground at distances up to 20 meters from line are presented.
2011 XXIII International Symposium on Information, Communication and Automation Technologies, 2011
Abstract This paper presents the application of coupled 1D and 2D isoparametric discontinuous bou... more Abstract This paper presents the application of coupled 1D and 2D isoparametric discontinuous boundary elements for calculation of large grounding systems. Indirect method of boundary elements was applied. Parts of long thin grounding conductor (eg, ...
2012 International Conference and Exposition on Electrical and Power Engineering, 2012
Grounding systems have the most important role in safety of staff and substation equipment and th... more Grounding systems have the most important role in safety of staff and substation equipment and therefore they require detailed analysis of relevant parameters. This paper discusses the possibility of application of software packages based on finite element method (FEM), when conducting analysis of grounding systems. Firstly the paper describes a mathematical model with assumptions on which is based. Complex grounding grids buried in both single-layer and double-layer soil where analyzed. In order to verify the presented model, calculation results are compared with results of various analytical and numerical methods, as well as with measured results. Finally to show the practical application of this approach, an example of a real grounding grid is calculated.
WIT Transactions on Modelling and Simulation, 2012
This paper considers the effect of discontinuity of electrical conductivity of electrolytes on th... more This paper considers the effect of discontinuity of electrical conductivity of electrolytes on the distribution of potential and protective current density in cathodic protection systems with galvanic anodes. The aim of the paper is to present a simultaneous analysis for application of both analytical and numerical models for calculation of the distribution of protective potential and current density in the cases of homogeneous and double-layer electrolytes. When considering non-linear boundary conditions at the electrode surface (secondary distribution of protective current density), the indirect boundary element method is used, because of the complexity of the calculation. Collocation at the point method was used for calculation. Due to the nonlinearity of boundary conditions at the electrode surfaces, the calculation problem is further complicated. In order to show the importance of this analysis, calculations for the observed system as well as calculations of errors caused by neglecting the boundary discontinuity of the soil conductivity are provided. Based on calculations and with respect to error analyses, the conclusive remark gives the impact valuation of the doublelayer electrolyte on the correct calculation of the cathodic protection system with galvanic anodes. This paper also gives the analysis when the double-layered nature of the electrolyte can practically be ignored, which has great importance for designers of these systems. Boundary Elements and Other Mesh Reduction Methods XXXIV 307
Journal of Microwaves, Optoelectronics and Electromagnetic Applications
This paper presents a new approach for uncertainty determination of the electric field intensity ... more This paper presents a new approach for uncertainty determination of the electric field intensity and magnetic flux density calculation in the vicinity of overhead transmission lines. The proposed method is based on the law of propagation of uncertainty as defined in the Guide to the expression of Uncertainty in Measurement. A mathematical model is developed for determining the electric field intensity and magnetic flux density calculation uncertainty based on the Charge simulation method and method based on Biot-Savart law, respectively. The verification of the proposed method was performed by estimating the uncertainty of the electric field and magnetic flux density calculations for four single circuit and two double circuit high-voltage overhead transmission lines. The analysis of the obtained results demonstrates that the proposed method can be successfully used to determine the uncertainty of electric field intensity and magnetic flux density calculations in the vicinity of overhead transmission lines.
2022 XXVIII International Conference on Information, Communication and Automation Technologies (ICAT)
2019 18th International Symposium INFOTEH-JAHORINA (INFOTEH)
This paper deals with algorithm for placement and sizing of the shunt capacitor banks in distribu... more This paper deals with algorithm for placement and sizing of the shunt capacitor banks in distribution networks of radial structure. In this paper algorithm for optimal placement and sizing of shunt capacitor banks is based on load flow calculation algorithm and integer genetic algorithm. Firstly, paper describes the problem of optimal placement and sizing of the shunt capacitor banks with constrains. Also, paper describes algorithm for the calculation of the load flow in the radial distribution networks. Used integer genetic algorithm is also presented. Proposed algorithm was verified on the IEEE 34 bus test distribution network. Finally, practical application of the proposed algorithm was demonstrated on one real 10 kV distribution network in Bosnia & Herzegovina.
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Papers by Adnan Mujezinović