Determination of Direction to Reconstruction of Grounding System

Руденко, С. С.; Koliushko, D. G.; Kashcheyev, O. V.

doi:10.20998/2074-272x.2017.2.09

Cited by 3 publications

(3 citation statements)

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“…Thus, the voltage in one of the phases is reduced to 0.3U f , and in the phases it increases to 1.5U f . Under such conditions, losses increase, insulation wear accelerates, and the harmful effect on communication lines increases [8].…”

Section: Methodsmentioning

confidence: 99%

Overvoltages during Single-Phase Earth Fault in Neutral-Isolated Networks (10÷35) kV

Rzayeva

Mammadov

Ganiyeva

2023

JENRR

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Aims: The purpose of the article is to analyze networks with zero insulation (10 ÷ 35) kV, which have disadvantages that adversely affect the insulation of operating equipment, as a result of which, in modern conditions, it is desirable to improve the operating modes of such networks. Place and Duration of Study: Department of Electromechanics (Electrical and electronic engineering). Methodology: To limit the surges that occur in such networks, an arc quenching coil is used, the operation of which is based on two processes: a coil that compensates for the capacitive current, a sharp decrease in the voltage recovery rate in the arc range. Results: In connection with the above, by carrying out accurate calculations, it is necessary to solve a number of issues on grounding the neutral with active resistance in networks (10÷35) kV: effective grounding of networks, ensuring safety, limiting the impact on communication lines, limitation of emerging surges, ensuring normal operation of switching devices, etc. Conclusion: 1. Due to the difficulty of obtaining an accurate adjustment when earthing the neutral through an arcing coil, and even under normal conditions, overvoltages in the phases are likely as a result of the displacement of the neutral. 2. Networks with zero insulation (10÷35) kV have disadvantages that adversely affect the insulation of operating equipment, and in modern conditions it is desirable to improve the operating modes of such networks.3. In networks with an isolated neutral (10÷35) kV, the connection of the neutral to earth with active resistance allows you to significantly limit the extreme voltages that may occur in the network.

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Section: Methodsmentioning

confidence: 99%

Overvoltages during Single-Phase Earth Fault in Neutral-Isolated Networks (10÷35) kV

Rzayeva

Mammadov

Ganiyeva

2023

JENRR

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“…In a number of works, for example [2], the directions of reconstruction of GS for ensuring electrical safety are considered.…”

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confidence: 99%

“…When the depth of the horizontal grounding bars is increased by a factor of 3.5, the GS resistance decreases only by 1.74 %, and the voltage U C increases only by 3.58 %. y = 0,0002x 4 -0,0048x 3 + 0,0467x 2 On the basis of the results of the conducted studies, it is possible to formulate the main provisions of the design methodology for the design realization of the GS of substations with switchgears 330(220) kV, which is aimed to providing EMC of current circuits:…”

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confidence: 99%

On the Issue of Design of Grounding Systems of 330(220) Kv Substations to Ensure the Electromagnetic Compatibility of Secondary Circuits

Glebov¹,

Koliushko²,

Koliushko³

et al. 2018

Elektroteh. elektromeh.

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The purpose of the work is to develop the fundamentals of the design methodology of grounding system design of substations with open switchgears 330 (220) kV, which is aimed at ensuring electromagnetic compatibility of secondary circuits of current transformers. Methodology. To carry out the research, the provisions of the theory of experiment planning, the theory of electrical circuits, mathematical modeling in the package Grounding 1.0 and Microsoft Excel were used. Results. During the onefactor experiments, the dependencies of the grounding system resistance and the voltage between the calculated points on the grounding system area, the size of the grid cell, the perimeter of the grounding system horizontal electrodes cross-section, the equivalent soil resistivity, the short-circuit current and the design factor were obtained. It is shown that the grounding system resistance and the voltage between the calculated points are practically independent of the depth of the horizontal electrodes in the depth range from 0.4 m to 1.4 m. Originality. The paper formulated three criteria for grounding system designing of substations 330 (220) kV, aimed at ensuring electromagnetic compatibility of secondary circuits. Practical value. The fundamentals of the methodology for grounding system designing are formulated according to the criterion of preventing false triggering of relay protections in emergency modes. References 10, tables 2, figures 14.

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The Factors of the Influence on the Touch Voltage From the Review of the Development of Recommendations for the Reconstruction of the Grounding Device

Koliushko¹,

Руденко²

2019

Teh. Elektrodin.

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The purpose of the work is to determine the factors that affect the value of touch voltage during the synthesis of recommendations for reconstruction of the grounding while minimizing labor and material costs. The dependences of the touch voltage on the single-phase ground fault current, the soil electrophysical characteristics, the design of the grounding, and the base resistance in the place, where equipment is serviced, are investigated. At the same time, statistical data of the energy objects, where measurements were carried out, tools for mathematical modeling of the electrical potential distribution in the grounding device and methods of physical experiment were used. In the paper the value of the saturation current for a fixed size of a uniform grounding grid is determined, taking into account the influence of all four types of three-layer soil on the touch voltage. The asymmetry of the touch voltage distribution along the equipment lines depending on the distance to the grounding edge is shown.

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Determination of Direction to Reconstruction of Grounding System

Cited by 3 publications

References 0 publications

Overvoltages during Single-Phase Earth Fault in Neutral-Isolated Networks (10÷35) kV

Overvoltages during Single-Phase Earth Fault in Neutral-Isolated Networks (10÷35) kV

On the Issue of Design of Grounding Systems of 330(220) Kv Substations to Ensure the Electromagnetic Compatibility of Secondary Circuits

The Factors of the Influence on the Touch Voltage From the Review of the Development of Recommendations for the Reconstruction of the Grounding Device

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