RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS
Introduction. The presence of free moisture in power cables leading to the formation of tree structures - water treeing, which originate in the amorphous phase polyethylene and are a major cause of degradation of the polymer insulation. They represent the damage of the polymer size from several micr...
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National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine”
2016
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Electrical Engineering & Electromechanics| id |
eiekhpieduua-article-69173 |
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Electrical Engineering & Electromechanics |
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English Russian |
| topic |
water treeing moisturizing cables solid and foamed polyethylene insulation dielectric loss tangent water clusters relaxation peaks 621.319 водные триинги увлажнение кабелей сплошная и вспененная полиэтиленовая изоляция тангенс угла диэлектрических потерь кластеры воды релаксационные максимумы 621.319 водні триїнги зволоження кабелів суцільна та спінена поліетиленова ізоляція тангенс кута діелектричних втрат кластери води релаксаційні максимуми 621.319 |
| spellingShingle |
water treeing moisturizing cables solid and foamed polyethylene insulation dielectric loss tangent water clusters relaxation peaks 621.319 водные триинги увлажнение кабелей сплошная и вспененная полиэтиленовая изоляция тангенс угла диэлектрических потерь кластеры воды релаксационные максимумы 621.319 водні триїнги зволоження кабелів суцільна та спінена поліетиленова ізоляція тангенс кута діелектричних втрат кластери води релаксаційні максимуми 621.319 Bezprozvannych, G. V. Kyessayev, A. G. RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS |
| topic_facet |
water treeing moisturizing cables solid and foamed polyethylene insulation dielectric loss tangent water clusters relaxation peaks 621.319 водные триинги увлажнение кабелей сплошная и вспененная полиэтиленовая изоляция тангенс угла диэлектрических потерь кластеры воды релаксационные максимумы 621.319 водні триїнги зволоження кабелів суцільна та спінена поліетиленова ізоляція тангенс кута діелектричних втрат кластери води релаксаційні максимуми 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 |
RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS |
| title_short |
RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS |
| title_full |
RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS |
| title_fullStr |
RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS |
| title_full_unstemmed |
RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS |
| title_sort |
relaxations losses in polyethylene insulation of coaxial cable structure during aging in high humidity conditions |
| title_alt |
РЕЛАКСАЦИОННЫЕ ПОТЕРИ В ПОЛИЭТИЛЕНОВОЙ ИЗОЛЯЦИИ КАБЕЛЕЙ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ В УСЛОВИЯХ ПОВЫШЕННОЙ ВЛАЖНОСТИ РЕЛАКСАЦИОННЫЕ ПОТЕРИ В ПОЛИЭТИЛЕНОВОЙ ИЗОЛЯЦИИ КАБЕЛЕЙ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ В УСЛОВИЯХ ПОВЫШЕННОЙ ВЛАЖНОСТИ |
| description |
Introduction. The presence of free moisture in power cables leading to the formation of tree structures - water treeing, which originate in the amorphous phase polyethylene and are a major cause of degradation of the polymer insulation. They represent the damage of the polymer size from several microns to 1 mm, developing technology for insulation defects under the combined action of the electric field and the moisture diffusing from the environment. Water treeing destroys the polymer chain, resulting in the formation of microcavities filled with moisture. The dynamics of water treeing and subtle properties largely depend on the composition, morphology of the polymer insulation, chemical nature of the defect, in which they originate. Due to the force of gravity in the water formed typical only for her region with locally ordered structure - clusters, which cause loss of relaxation. Purpose. Features presence of relaxation losses in high-frequency range in polyethylene insulation during aging in high humidity conditions of samples power and RF cables. Methodology. Samples of the power cable for the voltage of 35 kV with a cross-linked polyethylene insulation radial water-blocking protection from moisture and radio-frequency coaxial cable with thermoplastic insulation for 1440 hours in a humidity of 100%. The dielectric loss tangent measured resonance method before and after aging. Originality. Experimentally found evidence of the existence in the polymer cable insulation free water in the form of areas with locally ordered structure - clusters. It is found that the solid polyethylene insulation in the frequency dependence of dielectric loss tangent maximum relaxation shown one at 10 MHz in the initial state, and there are two additional frequency range 500 kHz - 5 MHz after moistening. For cross-linked polyethylene insulation characteristic of large width Δf of the frequency spectrum in which the observed relaxation losses. It is obvious that the width of each of the relaxation maxima is associated with characteristic fractal cluster size. It is important that the hydrated solid and foamed polyethylene insulation to show individuality, typical only for water clusters which are detected by high-frequency dipole relaxation peaks dielectric loss tangent. There is a positive correlation between the bandwidth Δf of relaxation maxima and the rate of decrease of insulation resistance by applying a high DC voltage. Practical value. Establishing a correlation between the bandwidth of relaxation maxima and the rate of decrease in the insulation resistance test objects in the laboratory makes it possible to diagnose the presence of free moisture in the power and RF cables by measuring the insulation resistance in exploitation. |
| publisher |
National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine” |
| publishDate |
2016 |
| url |
http://eie.khpi.edu.ua/article/view/2074-272X.2016.2.07 |
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AT bezprozvannychgv relaxationslossesinpolyethyleneinsulationofcoaxialcablestructureduringaginginhighhumidityconditions AT kyessayevag relaxationslossesinpolyethyleneinsulationofcoaxialcablestructureduringaginginhighhumidityconditions AT bezprozvannychgv relaksacionnyepoterivpoliétilenovojizolâciikabelejkoaksialʹnojkonstrukciivusloviâhpovyšennojvlažnosti AT kyessayevag relaksacionnyepoterivpoliétilenovojizolâciikabelejkoaksialʹnojkonstrukciivusloviâhpovyšennojvlažnosti |
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2024-06-01T14:38:28Z |
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2024-06-01T14:38:28Z |
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| spelling |
eiekhpieduua-article-691732017-08-21T18:28:57Z RELAXATIONS LOSSES IN POLYETHYLENE INSULATION OF COAXIAL CABLE STRUCTURE DURING AGING IN HIGH HUMIDITY CONDITIONS РЕЛАКСАЦИОННЫЕ ПОТЕРИ В ПОЛИЭТИЛЕНОВОЙ ИЗОЛЯЦИИ КАБЕЛЕЙ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ В УСЛОВИЯХ ПОВЫШЕННОЙ ВЛАЖНОСТИ РЕЛАКСАЦИОННЫЕ ПОТЕРИ В ПОЛИЭТИЛЕНОВОЙ ИЗОЛЯЦИИ КАБЕЛЕЙ КОАКСИАЛЬНОЙ КОНСТРУКЦИИ В УСЛОВИЯХ ПОВЫШЕННОЙ ВЛАЖНОСТИ Bezprozvannych, G. V. Kyessayev, A. G. water treeing moisturizing cables solid and foamed polyethylene insulation dielectric loss tangent water clusters relaxation peaks 621.319 водные триинги увлажнение кабелей сплошная и вспененная полиэтиленовая изоляция тангенс угла диэлектрических потерь кластеры воды релаксационные максимумы 621.319 водні триїнги зволоження кабелів суцільна та спінена поліетиленова ізоляція тангенс кута діелектричних втрат кластери води релаксаційні максимуми 621.319 Introduction. The presence of free moisture in power cables leading to the formation of tree structures - water treeing, which originate in the amorphous phase polyethylene and are a major cause of degradation of the polymer insulation. They represent the damage of the polymer size from several microns to 1 mm, developing technology for insulation defects under the combined action of the electric field and the moisture diffusing from the environment. Water treeing destroys the polymer chain, resulting in the formation of microcavities filled with moisture. The dynamics of water treeing and subtle properties largely depend on the composition, morphology of the polymer insulation, chemical nature of the defect, in which they originate. Due to the force of gravity in the water formed typical only for her region with locally ordered structure - clusters, which cause loss of relaxation. Purpose. Features presence of relaxation losses in high-frequency range in polyethylene insulation during aging in high humidity conditions of samples power and RF cables. Methodology. Samples of the power cable for the voltage of 35 kV with a cross-linked polyethylene insulation radial water-blocking protection from moisture and radio-frequency coaxial cable with thermoplastic insulation for 1440 hours in a humidity of 100%. The dielectric loss tangent measured resonance method before and after aging. Originality. Experimentally found evidence of the existence in the polymer cable insulation free water in the form of areas with locally ordered structure - clusters. It is found that the solid polyethylene insulation in the frequency dependence of dielectric loss tangent maximum relaxation shown one at 10 MHz in the initial state, and there are two additional frequency range 500 kHz - 5 MHz after moistening. For cross-linked polyethylene insulation characteristic of large width Δf of the frequency spectrum in which the observed relaxation losses. It is obvious that the width of each of the relaxation maxima is associated with characteristic fractal cluster size. It is important that the hydrated solid and foamed polyethylene insulation to show individuality, typical only for water clusters which are detected by high-frequency dipole relaxation peaks dielectric loss tangent. There is a positive correlation between the bandwidth Δf of relaxation maxima and the rate of decrease of insulation resistance by applying a high DC voltage. Practical value. Establishing a correlation between the bandwidth of relaxation maxima and the rate of decrease in the insulation resistance test objects in the laboratory makes it possible to diagnose the presence of free moisture in the power and RF cables by measuring the insulation resistance in exploitation. Выполнены измерения в диапазоне частот 50 кГц – 20 МГц тангенса угла диэлектрических потерь образцов силового и радиочастотного коаксиального кабелей в исходном состоянии и после увлажнения в условиях 100% влажности. После старения установлено появление дополнительных релаксационных максимумов для сплошной термореактивной и термопластичной полиэтиленовой изоляции, что обусловлено группированием свободной воды в кластеры соответствующей формы и фрактальной размерности. Для кабелей со вспененной термопластичной полиэтиленовой изоляцией в не состаренном состоянии присуще проявление релаксационных потерь за счет наличия воды в газообразных включениях. Установлена положительная корреляция между шириною полосы релаксационных максимумов и скоростью уменьшения сопротивления изоляции от приложенного высокого постоянного напряжения. Виконано вимірювання в діапазоні частот 50 кГц – 20 МГц тангенсу кута діелектричних втрат зразків силового та радіочастотного коаксіального кабелів в початковому стані та після зволоження в умовах 100% вологості. Після старіння встановлено появу додаткових релаксаційних максимумів для суцільної термореактивної та термопластичної поліетиленової ізоляції, що обумовлена групуванням вільної води в кластери відповідної форми та фрактальної розмірності. Для кабелів зі спіненою термопластичною ізоляцією в початковому незістареному стані притаманно прояв релаксаційних втрат за рахунок наявності води, розташованої в повітряних включеннях. Встановлено додатний кореляційний зв’язок між шириною смуги релаксаційних максимумів та швидкістю зменшення опору ізоляції від прикладеної високої постійної напруги. National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine” 2016-05-18 Article Article application/pdf application/pdf http://eie.khpi.edu.ua/article/view/2074-272X.2016.2.07 10.20998/2074-272X.2016.2.07 Electrical Engineering & Electromechanics; No. 2 (2016); 38-42 Электротехника и Электромеханика; № 2 (2016); 38-42 Електротехніка і Електромеханіка; № 2 (2016); 38-42 2309-3404 2074-272X en ru http://eie.khpi.edu.ua/article/view/2074-272X.2016.2.07/64347 http://eie.khpi.edu.ua/article/view/2074-272X.2016.2.07/64348 Copyright (c) 2016 G. V. Bezprozvannych, A. G. Kyessayev https://creativecommons.org/licenses/by-nc/4.0 |