Improving Calculation Accuracy of Currents in Cable Shields at Double-Sided Grounding of Three-Phase Cable Line

Grinchenko, V. S.; Tkachenko, Oleksandr; Grinchenko, N. V.

doi:10.20998/2074-272x.2017.2.06

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The issue of reducing losses is also relevant for cable lines, where currents are induced in the shields of singlecore cables according to a similar mechanism of influence (if there are conditions for their flow) [1, [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of the parameters of modern grounding wires on the value of power losses in them for overhead power lines of 330-750 kV

Krasnozhon,

Kvytsynskyi,

Buinyi

et al. 2023

Electrical Engineering & Electromechanics

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Introduction. The problem of estimating power losses in grounding wires with built-in fiber optic cable for overhead power lines of voltage class 330-750 kV is relevant, while it is obvious that the amount of losses depends on the chosen brand of wire. Problem. In the article, an analysis of the influence of the parameters of grounding wires on the amount of losses that occur in them in the normal mode of operation of the overhead power lines is carried out. Goal. The purpose of the work is to determine the criterion for the selection of grounding wires with a built-in optical fiber cable under the condition of increasing the energy efficiency of electricity transmission. Methodology. To calculate power losses in grounding wires, the methods of electromagnetic field theory were used, while taking into account the location of phase conductors on various types of towers of operating 330-750 kV overhead power lines and the possible current load of such lines. Results. The paper analyzed the dependence of losses in the grounding wires of the overhead power lines on the ratio of its active and reactive resistances, determined in which range of this ratio the losses will be close to the maximum. It is shown that the amount of specific power losses in the grounding wires of 330-750 kV overhead power lines in its normal operating modes can range from 1.6 kW/km for the 750 kV lines to hundreds of W/km for the 330 kV power lines. Originality. For the first time, it is recommended to use grounding wires with built-in fiber optic cable with running active resistance in the range of no more than 0.25 Ohm/km, which will minimize power losses and increase the energy efficiency of the 330-750 kV overhead power lines. Practical value. The obtained results can be applied at the stage of designing new or modernizing existing overhead power lines in order to reduce losses and increase the energy efficiency of lines.

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Section: Introductionmentioning

confidence: 99%

Study of the influence of the parameters of modern grounding wires on the value of power losses in them for overhead power lines of 330-750 kV

Krasnozhon,

Kvytsynskyi,

Buinyi

et al. 2023

Electrical Engineering & Electromechanics

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“…The articles [9,10] also raise problems of minimizing power losses in electrical networks. In [11], methods of calculating the currents that can flow through the cable screen in normal mode are considered. In [12,13], it is proposed to identify the aging of cable insulation by currents in screens that are grounded on both sides.…”

Section: Introductionmentioning

confidence: 99%

Correct Cross-Section of Cable Screen in a Medium Voltage Collector Network with Isolated Neutral of a Wind Power Plant

et al. 2021

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The article discusses the selection of cables for power lines connecting wind turbine generators at the wind power plant. The screen cross-section of these cables should be selected considering the value of the screen current at double line-to-earth fault. To calculate this current, the dimensions of the cable should be known. However, these parameters are hidden and cannot be used during designing. Therefore, a highly simplified method is currently used in practice. It is shown that the errors from the highly simplified method are up to 33%. Authors propose a simplified method based on open data of cable manufacturers. The proposed method is compared with simulation results of a common model of cable power line and takes into account self and mutual inductances of the cores and screens. It is shown that the error of the proposed method is smaller than 4.0% for real cable power lines at wind power plants. However, for a long section of cable power line (2.5 km) the error of calculation might increase up to 6.3%. This allows us to use the proposed method for designing. In addition, the authors show how the results of the highly simplified method can be corrected to improve accuracy.

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“…1,b), the currents in the cores form a system of direct sequence, and the currents in the shields are determined by the following relationships [7,13] : , 2 ln 2 3 2 ln 2 ln 4 ln 2 ln 3 2 ln 2 ln , 2 ln 3 2 ln , 2 ln 2 3 2 ln 2 ln 4 ln 2 ln 3 2 ln 2 ln In the case of trefoil arrangement of the cable line ( Fig. 1,a), the calculation dependence for currents in shields has a more compact form [7,13]:…”

mentioning

confidence: 99%

Determination of Analytical Calculation Error of Magnetic Field of High-Voltage Cable Lines With Two-Point Bonded Cable Shields Caused by Non-Uniform Current Distribution in the Shields

Tkachenko¹

2017

Elektroteh. elektromeh.

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В работе определена относительная погрешность аналитического расчета индукции магнитного поля трехфазной кабельной линии, обусловленная неравномерностью плотности тока в экранах одножильных кабелей. Погрешность получена путем сравнения численного расчета в программной среде COMSOL Multiphysics с аналитическим методом расчета. Показано, что максимальное значение погрешности не превышает 8 %. Полученные значения погрешности верифицированы путем тестирования численного расчета и подтверждены результатами эксперимента. Обоснована корректность аналитического расчета магнитного поля кабельных линий в точках его нормирования при двухстороннем замыкании экранов кабелей, выполняемого без учета неравномерности плотности тока в экранах кабелей. Библ. 13, рис. 4, табл. 2. Ключевые слова: кабельная линия, экран кабеля, двухстороннее заземление, магнитное поле, погрешность расчета.

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Improving Calculation Accuracy of Currents in Cable Shields at Double-Sided Grounding of Three-Phase Cable Line

Cited by 4 publications

References 5 publications

Study of the influence of the parameters of modern grounding wires on the value of power losses in them for overhead power lines of 330-750 kV

Study of the influence of the parameters of modern grounding wires on the value of power losses in them for overhead power lines of 330-750 kV

Correct Cross-Section of Cable Screen in a Medium Voltage Collector Network with Isolated Neutral of a Wind Power Plant

Determination of Analytical Calculation Error of Magnetic Field of High-Voltage Cable Lines With Two-Point Bonded Cable Shields Caused by Non-Uniform Current Distribution in the Shields

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