Increasing the Reliablity of the Measuring Circuits of Protection Relays

Vanin, Valery; Ambrosovskaya, T. D.; Popov, M.; Popov, Stanislav

doi:10.1007/s10749-016-0665-z

Cited by 20 publications

(4 citation statements)

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“…Based on the above, an important practical conclusion follows that for efficient and high-quality control of the magnetization current in the sub-transient (initial) stages of nonstationary idling modes, a refined mathematical description of power transformer equipment is required, since its calculated equivalent circuit with passport characteristics does not meet high accuracy requirements. Considering this, the results of the study of adaptive compensation of magnetization currents of power transformers and displacement currents, which are typical for the extended intersystem (interstate) connections, are presented in [4][5][6][7][8][9][10]. Unlike with the currently existing stationary compensation solutions in [4][5][6][7][8][9][10][11][12][13][14][15][16][17], the use of additional software algorithms for identification of power equipment parameters is proposed.…”

Section: Testing Of Identification Methods For Power Transformers Undmentioning

confidence: 99%

“…Considering this, the results of the study of adaptive compensation of magnetization currents of power transformers and displacement currents, which are typical for the extended intersystem (interstate) connections, are presented in [4][5][6][7][8][9][10]. Unlike with the currently existing stationary compensation solutions in [4][5][6][7][8][9][10][11][12][13][14][15][16][17], the use of additional software algorithms for identification of power equipment parameters is proposed. The proposed method allows to reduce the minimum tripping current to the level of 0.1-0.15 p.u.…”

Section: Testing Of Identification Methods For Power Transformers Undmentioning

confidence: 99%

“…Initially, this caused by the methodological error due to the insufficient mathematical rigor of the formulation of the research problem, and in some cases in using of unreliable primary (initial) parameters of the mathematical model during the performance of numerical experiments. All this inevitably causes errors in solving the problem when performing computational studies and can lead to subsequent misinterpretation of the obtained results, which is ultimately reflected in the erroneous view of the operation reliability and stability of the power system [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: The Problem Of Identification Of Mathematical Models Parametmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic methods of identification of electromagnetic parameters of power transformers in non-stationary mode

et al. 2019

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The report reflects the promising solutions for the creation of adaptive protection means and emergency automatics in the implementation of methods of identification of dynamic systems. Presented original research assigned at directly addressing the causes of the sensitivity lack of the transformer equipment protection - compensation for the magnetizing current of the power transformers by linearizing their transfer characteristics.

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Section: Testing Of Identification Methods For Power Transformers Undmentioning

confidence: 99%

Section: Testing Of Identification Methods For Power Transformers Undmentioning

confidence: 99%

Section: The Problem Of Identification Of Mathematical Models Parametmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic methods of identification of electromagnetic parameters of power transformers in non-stationary mode

et al. 2019

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“…Engineering simulations of magnetic fields in ferromagnetics are of importance for magnetic cores [1,2,3], technology (e.g. non-destructive testing [3,4,5,6]).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of alternating magnetic field in laminated ferromagnetic core

2018

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At engineering simulations of magnetic fields in ferromagnetic cores standard Preisach and Jiles-Atherton models are commonly used. At that a material magnetic properties are considered similar in all points of a core. However, the view of experimental hysteresis loops can differ from calculated even for materials with well-known magnetic properties, e.g. transformer steel. Experimental registration of hysteresis loops in characteristic zones of laminated steel core have revealed substantial discrepancy as in the loops view as in the field strength distribution in comparison with calculation results. Measurements at the frequency and field amplitude variation in order to reveal their influence on the magnetization process are conducted. The results obtained point to possible significant influence of magnetostriction effect on functioning of the ferromagnetic core. This influence can appear at frequencies of the core mechanical resonance and lead to changes in the core inductance and quality factor. The effect is relatively weakly pronounced at laminated steel core, but in some cases needs to be considered, e.g. if big size core operates at network frequency.

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Adaptive emergency control system with an algorithm for rapid assessment of sustainability united energy system

Popov

2019

J. Phys.: Conf. Ser.

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In the present study described the methodology for determination of sustainable modes of long equivalent of the interconnected power systems of various structures with simplified representation of excitation controllers of generators. According to the results of numerous studies, the criterion of oscillatory disturbance of static stability based on the control of the partial derivative ∂AN /∂δ is formulated. To confirm the formulated criterion of violation of the static vibrational stability performed quantitative mapping of polynomial coefficients of haracteristics equations and additional applications of the matrix equations is redundant points of the equivalent circuit of the Electrical Power Systems (EPS) obtained under the criterion Hurwitz. Quantitative comparison and qualitative analysis of the nature of the change in the roots of the characteristic equation and the Hurwitz determinants confirm that the transition across the boundary of the stability region, found by the formulated criterion on the basis of the control of the partial derivative ∂AN /∂δ taking into account the proposed simplified model of generators at the constant excitation voltage Uf = const, is accompanied by the appearance of reciprocal values of the Hurwitz determinants. Taking into account the generalizations and conclusions obtained, a modified method of studying the static oscillatory stability of the EPS is proposed. The efficiency of the developed algorithm for determining the boundary of the region of potentially stable regimes is estimated. It is shown that the proposed method has the best performance indicators and can reduce the computational cost.

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Increasing the Reliablity of the Measuring Circuits of Protection Relays

Cited by 20 publications

References 0 publications

Dynamic methods of identification of electromagnetic parameters of power transformers in non-stationary mode

Dynamic methods of identification of electromagnetic parameters of power transformers in non-stationary mode

Experimental study of alternating magnetic field in laminated ferromagnetic core

Adaptive emergency control system with an algorithm for rapid assessment of sustainability united energy system

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