Graphical zero-sequence cut-offs method of determining of fault to earth in electrical lines

Marković, Nenad; Bjelić, Slobodan; Jakšić, U.; Bogićević, Zorica

doi:10.1109/neurel.2008.4685567

Cited by 6 publications

(7 citation statements)

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“…The phenomenon and assess the value of the voltage and frequency that arise during the three-phase inclusion [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] can be analysed successfully by using the experience in simulation of single-phase equivalent circuits related to the activation of the reactor.…”

Section: Discussionmentioning

confidence: 99%

Calculation of Overvoltage and Estimation of Power Transformer’s Behavior When Activating the Reactors

Bjelić¹,

Bogićević²

2014

IJITCS

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The document illustrates the methods and algorithms for calculation of overvoltage at the power transformer excerpts during the activation of inductive consumer to secondary transformer. Characteristic stages are activation of the primary phase and followed by two other phases. The new specific condition occurs during the activation of each phase which is presented by alternative electric circuit and simplified equivalent scheme that is used to calculate the values and evaluate overvoltage. For selected parameters of the transformer and inductive loads, the simulation is performed with chosen MATLAB software package.

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Section: Discussionmentioning

confidence: 99%

Calculation of Overvoltage and Estimation of Power Transformer’s Behavior When Activating the Reactors

Bjelić¹,

Bogićević²

2014

IJITCS

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“…The output flux of a vector J  through the external edge plane of cylindrical conductor element with surface density  of the axis is determinate from the continuity equation [16,17]:…”

Section: The Calculation Of Transient Processes On Electric Condmentioning

confidence: 99%

Transient Processes on the Elements of Underground Installations

Jovanovic¹,

Bjelić²,

Marković³

2017

IJITCS

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Abstract-Transient processes on the elements of installation with electric conductive material may endanger the environment in urban areas and therefore action must be taken to mitigate possible consequences and protect the environment. Installation layers of lines of underground installation (electrical, gas, water…) that are used for the flow of energy/fluids do not provide a full protection and currents of static discharge discharged into the soil are particularly dangerous. At static discharges conductors receive high potentials and a strong electric field is created around them, which will be greater as the conductivity of the soil is weaker.If the value of the field is greater than the disruptive voltage of the soil around earth wire (probe) the breakthrough occurs and the majority of soil becomes conductive. Particular problem are components of high frequency currents or voltages. Disorders of frequency in the range of 50 Hz to 5 kHz that can affect the selection of installation parameters, in compliance with all environmental criteria, are simulated by adapted subprogram in the part of the package Sym Power MATLAB.

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“…As it is seen from this diagram, shortcircuit voltage = sc = sc is triangle's hypotenuse and catheters are active voltage sc, = sc and reactive voltage sc, = sc . The angle of voltage sc (or impedance, called short-circuit angle) triangle that graphically displays [8,9] the short-circuit conditions is stated as a reference for the short-circuit triangle and is sc = arctan( sc / sc ). By adjusting ≈ 1 = sc /2 we will get the simpler expressions for the current magnetizing and short-circuit ems:̇=…”

Section: The Short-circuitmentioning

confidence: 99%

Graph-Analytical Method of Determining Impedance in Electrical Transformers

Bogićević

Bjelić²,

Spalević³

et al. 2015

Mathematical Problems in Engineering

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This paper presents a graph-analytical method for determining the electrical impedance of alternate energy sources, especially small power transformers and current transformers in electric networks. Unlike conventional short-circuit and idle tests, according to proposed method, in this paper, transformer parameters are determined in a new way, which is based on measurement of voltages and currents on the active and reactive load (inductive or capacitive). The effectiveness of the proposed model was verified using an adapted simulation in the software package MATLAB Simulink. The simulation was performed for three types of ABB transformers with a 100% load. Simulation results were obtained for power transformers:

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Graphical zero-sequence cut-offs method of determining of fault to earth in electrical lines

Cited by 6 publications

References 0 publications

Calculation of Overvoltage and Estimation of Power Transformer’s Behavior When Activating the Reactors

Calculation of Overvoltage and Estimation of Power Transformer’s Behavior When Activating the Reactors

Transient Processes on the Elements of Underground Installations

Graph-Analytical Method of Determining Impedance in Electrical Transformers

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