THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN

THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN

Introduction. Reliability of high voltage power cables in the process of long-term operation is largely due to the intensity of polymeric insulation aging. It is now established that the aging of polyethylene, which is the main material for the insulation of high voltage power cables, under the acti...

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Date:2016
Main Authors: Bezprozvannych, G. V., Kyessayev, A. G.
Format: Article
Language:English
Russian
Published: National Technical University "Kharkiv Polytechnic Institute" and Аnatolii Pidhornyi Institute of Power Machines and Systems of NAS of Ukraine 2016
Subjects:
eccentricity
ellipticity of insulation
water treeing
electric field strength
the wave impedance
the probe pulse
621.319
Online Access:http://eie.khpi.edu.ua/article/view/2074-272X.2016.6.09
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Journal Title:Electrical Engineering & Electromechanics

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Electrical Engineering & Electromechanics
id eiekhpieduua-article-86402
record_format ojs
institution Electrical Engineering & Electromechanics
baseUrl_str
datestamp_date 2017-08-21T18:31:41Z
collection OJS
language English
Russian
topic eccentricity
ellipticity of insulation
water treeing
electric field strength
the wave impedance
the probe pulse
621.319
spellingShingle eccentricity
ellipticity of insulation
water treeing
electric field strength
the wave impedance
the probe pulse
621.319
Bezprozvannych, G. V.
Kyessayev, A. G.
THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN
topic_facet eccentricity
ellipticity of insulation
water treeing
electric field strength
the wave impedance
the probe pulse
621.319
эксцентриситет
эллиптичность изоляции
водные триинги
напряженность электрического поля
волновое сопротивление
зондирующий импульс
621.319
ексцентриситет
еліптичність ізоляції
водяні триїнги
напруженість електричного поля
хвильовий опір
зондуючий сигнал
621.319
format Article
author Bezprozvannych, G. V.
Kyessayev, A. G.
author_facet Bezprozvannych, G. V.
Kyessayev, A. G.
author_sort Bezprozvannych, G. V.
title THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN
title_short THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN
title_full THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN
title_fullStr THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN
title_full_unstemmed THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN
title_sort technological and exploitative factors of local increase of electric field strength in the power cable of coaxial design
title_alt ТЕХНОЛОГИЧЕСКИЕ И ЭКСПЛУАТАЦИОННЫЕ ФАКТОРЫ ЛОКАЛЬНОГО УСИЛЕНИЯ НАПРЯЖЕННОСТИ ЭЛЕКТРИЧЕСКОГО ПОЛЯ В СИЛОВОМ КАБЕЛЕ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ
ТЕХНОЛОГИЧЕСКИЕ И ЭКСПЛУАТАЦИОННЫЕ ФАКТОРЫ ЛОКАЛЬНОГО УСИЛЕНИЯ НАПРЯЖЕННОСТИ ЭЛЕКТРИЧЕСКОГО ПОЛЯ В СИЛОВОМ КАБЕЛЕ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ
description Introduction. Reliability of high voltage power cables in the process of long-term operation is largely due to the intensity of polymeric insulation aging. It is now established that the aging of polyethylene, which is the main material for the insulation of high voltage power cables, under the action of the electric field is determined primarily by the presence of structural heterogeneity arising both during cable production and during use. The cable is always there deviations from the ideal structure, which manifest in a deviation of diameters of conductors from nominal values; in the arrangement of the conductor and the insulation is not strictly coaxially and eccentrically; in elliptic (oval) core and insulation; change in relative dielectric constant and thickness of insulation on cable length force the formation of low molecular weight products (including water) in the flow at the manufacturing stage crosslinked polyethylene insulation and moisture during operation. Such defects are structural, technological and operational irregularities, which lead to a local change in the electric field. Purpose. Analysis of the influence of the eccentricity, elliptic and spherical inclusions in the electric field distribution in the power cable of a coaxial design with cross-linked polyethylene insulation, based on numerical simulation. Methodology. The bases of the numerical method of calculation of the electrical field strength are Fredholm integral equations of the first and second kind (method of secondary sources) for an axially symmetric field. Analysis of the influence of irregularities, including water treeing, the shape of the sounding signal is made using the method of discrete resistive circuit inductance and capacitance of substitution with the initial conditions. Solving systems of linear algebraic equations nodal analysis performed by the sweep method. Results. The presence of the eccentricity and ellipticity in the construction of cable has different effects on the distribution of the electrical field strength at the conductor and the insulation. The electrical field strength is increased by 50 % in the core and 17 % - on the surface of the insulation at 10 % eccentricity between conductor and insulation. Availability elliptic insulation leads to a redistribution of the electric field: field strength at the surface of the insulation is 2 times higher electric field strength on the surface of the conductor. Water treeing spherical shape filled with water with a dielectric constant of 6.9, lead to a local increase of electric field intensity is 5 - 10 times. Originality. Simulation results show that the presence of water treeing concentrated with individual heterogeneity characteristic impedance causes a change in shape and duration of the probe signal rectangular. Practical value. Time domain reflectometer can be considered as one of the promising methods for diagnosing operational irregularities (ellipticity, eccentricity, water treeing) in power cables.
publisher National Technical University "Kharkiv Polytechnic Institute" and Аnatolii Pidhornyi Institute of Power Machines and Systems of NAS of Ukraine
publishDate 2016
url http://eie.khpi.edu.ua/article/view/2074-272X.2016.6.09
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first_indexed 2025-07-17T11:46:36Z
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spelling eiekhpieduua-article-864022017-08-21T18:31:41Z THE TECHNOLOGICAL AND EXPLOITATIVE FACTORS OF LOCAL INCREASE OF ELECTRIC FIELD STRENGTH IN THE POWER CABLE OF COAXIAL DESIGN ТЕХНОЛОГИЧЕСКИЕ И ЭКСПЛУАТАЦИОННЫЕ ФАКТОРЫ ЛОКАЛЬНОГО УСИЛЕНИЯ НАПРЯЖЕННОСТИ ЭЛЕКТРИЧЕСКОГО ПОЛЯ В СИЛОВОМ КАБЕЛЕ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ ТЕХНОЛОГИЧЕСКИЕ И ЭКСПЛУАТАЦИОННЫЕ ФАКТОРЫ ЛОКАЛЬНОГО УСИЛЕНИЯ НАПРЯЖЕННОСТИ ЭЛЕКТРИЧЕСКОГО ПОЛЯ В СИЛОВОМ КАБЕЛЕ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ Bezprozvannych, G. V. Kyessayev, A. G. eccentricity ellipticity of insulation water treeing electric field strength the wave impedance the probe pulse 621.319 эксцентриситет эллиптичность изоляции водные триинги напряженность электрического поля волновое сопротивление зондирующий импульс 621.319 ексцентриситет еліптичність ізоляції водяні триїнги напруженість електричного поля хвильовий опір зондуючий сигнал 621.319 Introduction. Reliability of high voltage power cables in the process of long-term operation is largely due to the intensity of polymeric insulation aging. It is now established that the aging of polyethylene, which is the main material for the insulation of high voltage power cables, under the action of the electric field is determined primarily by the presence of structural heterogeneity arising both during cable production and during use. The cable is always there deviations from the ideal structure, which manifest in a deviation of diameters of conductors from nominal values; in the arrangement of the conductor and the insulation is not strictly coaxially and eccentrically; in elliptic (oval) core and insulation; change in relative dielectric constant and thickness of insulation on cable length force the formation of low molecular weight products (including water) in the flow at the manufacturing stage crosslinked polyethylene insulation and moisture during operation. Such defects are structural, technological and operational irregularities, which lead to a local change in the electric field. Purpose. Analysis of the influence of the eccentricity, elliptic and spherical inclusions in the electric field distribution in the power cable of a coaxial design with cross-linked polyethylene insulation, based on numerical simulation. Methodology. The bases of the numerical method of calculation of the electrical field strength are Fredholm integral equations of the first and second kind (method of secondary sources) for an axially symmetric field. Analysis of the influence of irregularities, including water treeing, the shape of the sounding signal is made using the method of discrete resistive circuit inductance and capacitance of substitution with the initial conditions. Solving systems of linear algebraic equations nodal analysis performed by the sweep method. Results. The presence of the eccentricity and ellipticity in the construction of cable has different effects on the distribution of the electrical field strength at the conductor and the insulation. The electrical field strength is increased by 50 % in the core and 17 % - on the surface of the insulation at 10 % eccentricity between conductor and insulation. Availability elliptic insulation leads to a redistribution of the electric field: field strength at the surface of the insulation is 2 times higher electric field strength on the surface of the conductor. Water treeing spherical shape filled with water with a dielectric constant of 6.9, lead to a local increase of electric field intensity is 5 - 10 times. Originality. Simulation results show that the presence of water treeing concentrated with individual heterogeneity characteristic impedance causes a change in shape and duration of the probe signal rectangular. Practical value. Time domain reflectometer can be considered as one of the promising methods for diagnosing operational irregularities (ellipticity, eccentricity, water treeing) in power cables. На основе численного моделирования выполнен анализ влияния эксцентриситета между токопроводящей жилой и изоляцией, эллиптичности изоляции и включений сферической формы на распределение напряженности электростатического поля в силовом кабеле коаксиальной конструкции со сшитой полиэтиленовой изоляцией. Показано, что активный характер и высокие значения эффективной проводимости полупроводящих экранов не влияют на распределение поля между жилой и изоляцией. Наличие в толще изоляции водных включений сферической формы приводит к усилению электрического поля в 5 и более раз в зависимости от диэлектрической проницаемости. Водные триинги, как локальные сосредоточенные неоднородности в структуре полиэтиленовой изоляции, приводят к изменению формы зондирующего прямоугольного сигнала, распространяющегося в силовой кабельной линии, что дает возможность в эксплуатации диагностировать их с помощью импульсной рефлектометрии. На основі чисельного моделювання виконано аналіз впливу ексцентриситету між струмопровідною жилою та ізоляцією, еліптичності ізоляції та включень сферичної форми на розподіл напруженості електростатичного поля в силовому кабелі коаксіальної конструкції зі зшитою поліетиленовою ізоляцією. Показано, що активний характер та високі значення ефективної провідності напівпровідних екранів не впливають на розподіл поля між жилою та ізоляцією. Наявність в товщі ізоляції водяних включень сферичної форми призводить до посилення електричного поля в 5 і більше разів в залежності від діелектричної проникності. Водяні триїнги, як локальні зосереджені неоднорідності в структурі зшитої поліетиленової ізоляції, призводять до змінення форми прямокутного сигналу, який розповсюджується в силовій кабельній лінії, що дає можливість в експлуатації діагностувати їх за допомогою імпульсної рефлектометрії. National Technical University "Kharkiv Polytechnic Institute" and Аnatolii Pidhornyi Institute of Power Machines and Systems of NAS of Ukraine 2016-12-19 Article Article Peer-reviewed Article application/pdf application/pdf http://eie.khpi.edu.ua/article/view/2074-272X.2016.6.09 10.20998/2074-272X.2016.6.09 Electrical Engineering & Electromechanics; No. 6 (2016); 54-59 Электротехника и Электромеханика; № 6 (2016); 54-59 Електротехніка і Електромеханіка; № 6 (2016); 54-59 2309-3404 2074-272X en ru http://eie.khpi.edu.ua/article/view/2074-272X.2016.6.09/82189 http://eie.khpi.edu.ua/article/view/2074-272X.2016.6.09/82190 Copyright (c) 2016 G. V. Bezprozvannych, A. G. Kyessayev https://creativecommons.org/licenses/by-nc/4.0

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