Identification of interturn faults in power transformers by means of generalized symmetrical components analysis

Ivanchenko, Daniil I.; Смирнов, А И

doi:10.1051/e3sconf/201914004007

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The contribution coefficient of the source of distributed generation can be expressed as the ratio of short-circuit current from the power system without distributed generation to the short-circuit current with distributed generation, where the short-circuit currents are determined using the developed algorithm [30].…”

Section: Adaptive Current Protection Algorithmmentioning

confidence: 99%

Adaptive current protection in electrical complexes with small power plants

Смирнов

Shklyarskiy

2021

E3S Web Conf.

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The article considers electrical complexes with power plants of small capacity. The influence of power generation sources on short-circuit current distribution has been investigated. Reduced sensitivity of back-up current protection and dependence of current distribution on power plant capacity are revealed. Recommendations for minimizing false operation of short-circuit protection in networks with distributed power generation are proposed. An algorithm for adaptive current protection, which uses graph theory to determine the stages of selectivity of relay protection based on finding the shortest Dijkstra path and calculation of equivalent resistance in networks with multiple sources of power generation, which provides selec-tivity and sensitivity of current protection when changing the generated power of generators and the structure of the distribution network is pre-sented. The algorithm uses communication lines with a central control unit to monitor the distribution network and update the current triggering of the relay protection in accordance with changes in the structure of the power grid. The proposed system is designed so that it can respond to dynamic changes in the structure of the network and the state of operation of power plants. Simulation modeling in the Matlab/Simulink software package was performed and the results of the algorithm are presented.

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Section: Adaptive Current Protection Algorithmmentioning

confidence: 99%

Adaptive current protection in electrical complexes with small power plants

Смирнов

Shklyarskiy

2021

E3S Web Conf.

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“…The proposed procedure. Turn to turn winding fault are regarded as the main factor of the transformer deficiencies, and can lead to small changes on primary and secondary voltages and currents [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…(12) It is known that, in faulty conditions the negative sequence currents in Fig. 1 are greater than the direct sequence currents [16][17][18]. The three symmetrical current components are described in this paper as:…”

Section: Introductionmentioning

confidence: 99%

Improvement of power transformer differential protection through detection and exploitation of the negative sequence currents

Zitouni

2022

Electrical Engineering & Electromechanics

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Introduction. Power transformers are the most important and the most expensive equipment used in transport and distribution of electrical energy. Their failure results in huge economic losses. Despite the great advances in the design of power equipment in recent years, the feeble link in the chain remains the insulation weakness of coil turns of the power transformer. The novelty of the proposed research consists in the development of a new procedure for diagnosing and localizing the occurrence of turn to turn short-circuits in the windings of three-phase power transformer. The main problems of the current differential relay are short circuits of one or more turns of a transformer winding. Hence a new approach using' the amplitude comparison between the negative sequence currents' is developed and a digital discriminator internal / external fault is applied to discriminate turn to turn faults among the other ones. The proposed procedure is based on the exploitation of the negative sequence currents. The purpose of using this new procedure is to identify small faults inside power transformer coils and to distinguish inner faults from the outer faults by using an ameliorate circuit. The method used in this paper is a novel algorithm which based on the comparison between the negative sequence current amplitudes and to calculate the corresponding phase angle shifts. The performance of the proposed procedure has been confirmed by MATLAB/Simulink environment. The results of simulation reveal the efficiency of the suggested procedure, and indicate that this procedure can provide fast and sensitive approach for detecting low level turn-to-turn faults.

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Improvement of the frequency converter’s equivalent circuit when calculating non-sinusoidal modes

Belsky

Dobush

Zamyatin

2020

J. Phys.: Conf. Ser.

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The issues related to modeling a variable frequency drive are discussed in the article. The authors were faced with the task of determining the influence of the drive load on the parameters of its equivalent circuit. An unambiguous dependence of the drive load on the value of the current’s harmonic components is revealed. Namely, the smaller the load, the greater the value of the current’s higher harmonics. It has been established that disregarding drive loading can lead to a 19% error in modeling the frequency converter current consumption. It is shown that the results of the study can be extended to a wide range of drives in terms of power, since all calculations were performed in relative units.

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Identification of interturn faults in power transformers by means of generalized symmetrical components analysis

Cited by 7 publications

References 6 publications

Adaptive current protection in electrical complexes with small power plants

Adaptive current protection in electrical complexes with small power plants

Improvement of power transformer differential protection through detection and exploitation of the negative sequence currents

Improvement of the frequency converter’s equivalent circuit when calculating non-sinusoidal modes

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