Analysis of long-term monitoring of autotransformer neutral currents

Селиванов, В. Н.; Баранник, М. Б.; Bilin, Vladislav; Efimov, B. V.; Колобов, В. В.; Sakharov, Ya. A.

doi:10.21443/1560-9278-2018-21-4-607-615

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Geomagnetic storms cause a variety of emergencies and crisis situations: deterioration of the state of biological objects, functional disturbances and failures of electrical equipment in wire communication systems, in electric power systems, signaling and communication systems, increased electromagnetic impact on the environment [7].…”

Section: Resultsmentioning

confidence: 99%

Creation of a system for automatic monitoring of electromagnetic effects on biological and technical systems

Grabchak¹,

Grigoriev

Loginov

2022

BIO Web Conf.

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Using a digital “twin” of a convergent biological and technical supersystem of a certain region to develop measures to ensure environmental safety is because of the need to analyze and predict processes and the level of electromagnetic pollution of the environment because of geomagnetic storms in interaction with the operation of electric power facilities. The article proposes modeling a digital “twin” using indicators of the taxonomy of the identified functional relationships about the influence of natural and man-made electromagnetic fields. The study aims to develop fresh approaches to the development of methods for analyzing the influence of electromagnetic factors on people, animals, plants and technical systems using general and special technologies for recording the levels of pulsed electromagnetic effects. The authors use methods of management theory, expert decision-making methods, principles and approaches of international standards and recommendations in management, ecology and informatics. The article proposes an analysis and identification of the reactions of the digital “twin” of a convergent biological and technical supersystem of a certain region to different categories of signals (information) about the effect of a complex of electromagnetic pollutants, with the determination of indicators of environmental safety and critical electromagnetic effects. The new technology provides for the study of the amplitude of electromagnetic pulses in a wide frequency range, their interpretation, analysis and development of recommendations for maintaining the required modes of environmental monitoring. The necessity of creating new cyber-physical environmental monitoring systems based on the operation of the automatic monitoring system of electromagnetic influences based on noise-resistant sensors for registering the levels of pulsed electromagnetic influences is substantiated.

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Section: Resultsmentioning

confidence: 99%

Creation of a system for automatic monitoring of electromagnetic effects on biological and technical systems

Grabchak¹,

Grigoriev

Loginov

2022

BIO Web Conf.

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“…The effect of GICs is modeled by the geoelectric field source G2 acting between the grounding devices of the unit transformer T1 and autotransformer T2. Instrumental measurements indicated that the process of unfolding of real-life GICs over time is a sequence of unipolar spikes, which are characterized by random variation of both shape and parameters: the amplitude ranges from a few amperes to hundreds of amperes and duration ranges from tens of seconds to tens of minutes [11,12,13,14]. Under these conditions, a proper research tool is the use of a test GIC event acting as a disturbance, which reproduces only the main parameters of a real-life spike: its amplitude and duration.…”

Section: Model Of An Off-the-grid Power Systemmentioning

confidence: 99%

Harmonic content of the synchronous generator stator current in the case of unit transformer saturation due to geomagnetically induced currents

Vakhnina,

Kuvshinov,

Chernenko

et al. 2023

E3S Web Conf.

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The study investigates the features of the operation of off-the-grid power systems. Such power systems are commonly used for supplying power to consumers spread throughout the Arctic zone of the Russian Federation, and their unique operating conditions are due to the effect of geomagnetically induced currents (GICs) resulting from geomagnetic disturbances. We argue that the cause of stator current deviations from the pure sine wave are unit transformers. Their low-voltage windings are directly connected to stator windings of synchronous generators, and GICs run through grounded high-voltage windings. To support our claim, we simulated the effect of a test GIC event. Its amplitude in each of high-voltage phase windings of the unit transformer was 100 A, and the duration was 20 seconds (power transformers of the Hydro-Québec power grid were exposed to geomagnetically induced currents of a similar intensity during the geomagnetic storm on March 13-14, 1989). The spike targeted the "generator (TVF-100-2) - transformer (TDTs-125000/220/10.5)" unit that fed a major consumer node (Рnom = 83.125 MW, Qnom = 29.75 Mvar, cosφ=0.95) through a 160 km long double-circuit overhead line. Our study demonstrated that the effect of GICs on the operation of synchronous generators started from the moment of saturation of the unit transformer's core due to the inverse transformation of magnetizing current harmonics in the stator winding circuit. The harmonics introduced significant deviations from the pure sine wave into the curve of instantaneous stator currents. We calculated the nonlinear distortion factor of the stator current, which reached an unacceptably high value of THD=55.59%, 10 seconds into the test GIC event. The study showed that the 2nd and 4th harmonics of the unit transformer magnetizing current were responsible for the great bulk of deviations from the pure sine wave of the stator current.

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Study of the Impact of Strong Magnetic Storm on the Consolidated Power System of the Center of Russia

Trenkin,

Voevodin,

Koblova

et al. 2023

Dokl. Phys.

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Analysis of long-term monitoring of autotransformer neutral currents

Cited by 5 publications

References 2 publications

Creation of a system for automatic monitoring of electromagnetic effects on biological and technical systems

Creation of a system for automatic monitoring of electromagnetic effects on biological and technical systems

Harmonic content of the synchronous generator stator current in the case of unit transformer saturation due to geomagnetically induced currents

Study of the Impact of Strong Magnetic Storm on the Consolidated Power System of the Center of Russia

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