{"id":3706,"date":"2026-02-20T13:11:00","date_gmt":"2026-02-20T11:11:00","guid":{"rendered":"https:\/\/icmet.wattmedia.ro\/?page_id=3706"},"modified":"2026-03-17T13:34:28","modified_gmt":"2026-03-17T11:34:28","slug":"proiect-sd-icmet-craiova","status":"publish","type":"page","link":"https:\/\/icmet.wattmedia.ro\/en\/proiecte-icmet-craiova\/planul-national-cdi\/proiect-sd-icmet-craiova\/","title":{"rendered":"SD Project: Dielectric Spectroscopy for Insulation Diagnosis"},"content":{"rendered":"<div style=\"text-align: center; margin-bottom: 30px;\">\n<h2 style=\"color: #003366; margin-top: 0; margin-bottom: 15px; font-weight: bold; text-transform: uppercase;\">\n        SD Project: Dielectric Spectroscopy for Insulation Diagnosis<br \/>\n    <\/h2>\n<p style=\"color: #cc0000; font-weight: bold; font-size: 1.1em; margin: 0;\">\n        Project director: Eng. Dorin Popa (ICMET Craiova)\n    <\/p>\n<\/div>\n<h2 style=\"color: #003366; margin-top: 30px; margin-bottom: 15px; border-bottom: 2px solid #ccc; padding-bottom: 5px;\">\n    General data of the research project<br \/>\n<\/h2>\n<div style=\"display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 40px;\">\n<div style=\"flex: 1; min-width: 300px; border: 1px solid #ddd; background-color: #f4f4f4; padding: 20px;\">\n<ul style=\"list-style-type: none; padding-left: 0; margin: 0; color: #444; line-height: 1.8;\">\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>Project title:<\/strong> Dielectric spectroscopy \u2013 an innovative technology for diagnosing the insulation of energy equipment<\/li>\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>Acronym:<\/strong> SD (Contract: 22100\/01.10.2008)<\/li>\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>Period:<\/strong> 01.10.2008 &#8211; 29.07.2011<\/li>\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>Program:<\/strong> Programul 4 &#8211; Parteneriate in domenii prioritare (Energie)<\/li>\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>Project type:<\/strong> Research Project (RP)<\/li>\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>Total amount:<\/strong> 1,400,000 lei<\/li>\n<li style=\"margin-bottom: 10px; border-bottom: 1px dotted #ccc; padding-bottom: 5px;\"><strong>From the budget:<\/strong> 1,240,000 lei<\/li>\n<li><strong>Co-financing:<\/strong> 160,000 lei<\/li>\n<\/ul><\/div>\n<div style=\"flex: 1; min-width: 300px; border: 1px solid #ddd; background-color: #fff; padding: 20px; box-shadow: 0 2px 5px rgba(0,0,0,0.05);\">\n<h3 style=\"color: #003366; margin-top: 0; font-size: 1.2em; border-bottom: 1px solid #eee; padding-bottom: 10px;\">Consortium of partners<\/h3>\n<ul style=\"list-style-type: square; padding-left: 20px; margin: 0; line-height: 1.8; color: #444;\">\n<li style=\"margin-bottom: 12px;\"><strong>Main contractor:<\/strong> ICMET Craiova (Director Eng. Dorin Popa)<\/li>\n<li style=\"margin-bottom: 12px;\"><strong>Contracting Authority:<\/strong> National Program Management Center<\/li>\n<li style=\"margin-bottom: 12px;\"><strong>Partner 1:<\/strong> University of Craiova (Respons. Assoc. Prof. Dr. Eng. Florian Stefanescu)<\/li>\n<li style=\"margin-bottom: 0;\"><strong>Partner 2:<\/strong> University of Pitesti (Respons. Assoc. Prof. Dr. Eng. Dumitru Cazacu)<\/li>\n<\/ul><\/div>\n<\/div>\n<h2 style=\"color: #003366; margin-top: 30px; margin-bottom: 15px; border-bottom: 2px solid #ccc; padding-bottom: 5px;\">\n    Project summary and innovative technology<br \/>\n<\/h2>\n<h3 style=\"color: #cc0000; font-size: 1.1em; margin-bottom: 10px; margin-top: 0;\">The challenges of electrical insulation<\/h3>\n<div style=\"background-color: #bcffbc; padding: 25px; margin-bottom: 20px; box-shadow: 0 2px 5px rgba(0,0,0,0.05);\">\n<p style=\"color: #333; line-height: 1.6; margin-top: 0;\">\n        The electrical insulation of power equipment undergoes a continuous aging process under normal conditions. It is severely degraded as a result of thermal and electrical stresses in the network. Aging directly leads to a drastic reduction in service life. In many cases, defects occur that affect the safe operation of the power system. This system ensures the vital transmission and distribution of electricity.\n    <\/p>\n<p style=\"color: #333; line-height: 1.6; margin-bottom: 0;\">\n        Current research is directed towards a much better understanding of the aging phenomenon. The goal is to find new advanced insulation diagnostics technologies. We want a correct estimate of the remaining life of the equipment. Several types of preventive maintenance are already applied worldwide. They ensure the security of the system operation with the lowest possible financial costs.\n    <\/p>\n<\/div>\n<h3 style=\"color: #cc0000; font-size: 1.1em; margin-bottom: 10px;\">Applied dielectric spectroscopy<\/h3>\n<div style=\"border: 1px solid #ddd; background-color: #fff; padding: 25px; margin-bottom: 30px;\">\n<p style=\"color: #444; line-height: 1.6; margin-top: 0;\">\n        A first step was to select methods for investigating the condition of the electrical insulation. Methods were chosen that provide completely objective and extremely precise information. We selected the analysis of dissolved gases in oil for the vital prevention stage. We chose the measurement of partial discharges to highlight serious defects in the system.\n    <\/p>\n<p style=\"color: #444; line-height: 1.6;\">\n        The project approaches a completely new and revolutionary technological method in the field. We use frequency domain analysis of the response of the studied insulation. This perfectly highlights incipient defects and accurately assesses the remaining service life. The method is much less influenced by the variation of the working temperature. It is also not affected by the complex geometry of the equipment being examined.\n    <\/p>\n<p style=\"color: #444; line-height: 1.6; margin-bottom: 0;\">\n        We will use computer-aided modeling and physical experiments in the laboratory. The tests are performed on insulation mock-ups with preset degrees of severe infestation. The dielectric losses will be precisely determined as a function of the applied frequency. We evaluate the functional state of the insulation by direct comparison during diagnosis. The procedure will be validated by actual measurements on power and instrument transformers. The tests are performed both in the laboratory and on-site.\n    <\/p>\n<\/div>\n<h2 style=\"color: #003366; margin-top: 40px; margin-bottom: 15px; border-bottom: 2px solid #ccc; padding-bottom: 5px;\">\n    Project execution stages<br \/>\n<\/h2>\n<h3 style=\"color: #cc0000; font-size: 1.2em; margin-bottom: 10px;\">Stage 1: Study of measurement techniques<\/h3>\n<div style=\"border: 2px solid #ccc; background-color: #fff; padding: 20px; margin-bottom: 20px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;\">\n<div style=\"flex: 1; min-width: 300px;\">\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 5px;\">\n            Study of measurement techniques for dielectric analysis.\n        <\/p>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 0; font-size: 0.95em;\">\n            <strong>Period:<\/strong> 01.10.2008 &#8211; 27.02.2009<br \/>\n            <strong>Stage value:<\/strong> 160,500 lei (Budget: 100,500 lei | Co-financing: 60,000 lei)<br \/>\n            <strong>Distribution:<\/strong> ICMET (32,500 budget + 60,000 cof.), Univ. Craiova (49,500 budget), Univ. Pitesti (18,500 budget).\n        <\/p>\n<\/p><\/div>\n<\/div>\n<h3 style=\"color: #cc0000; font-size: 1.2em; margin-bottom: 10px;\">Stage 2: Development of experimental models<\/h3>\n<div style=\"border: 2px solid #ccc; background-color: #f4f4f4; padding: 20px; margin-bottom: 20px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;\">\n<div style=\"flex: 1; min-width: 300px;\">\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 5px;\">\n            Development of experimental models of insulation systems with different degrees of infestation. We model thermal and electrical aging under laboratory conditions.\n        <\/p>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 0; font-size: 0.95em;\">\n            <strong>Period:<\/strong> 01.03.2009 \u2013 30.10.2009<br \/>\n            <strong>Stage value:<\/strong> 59,930 lei (Budget: 59,930 lei | Co-financing: 0 lei)<br \/>\n            <strong>Distribution:<\/strong> ICMET Craiova (59,930 lei budget).\n        <\/p>\n<\/p><\/div>\n<\/div>\n<h3 style=\"color: #cc0000; font-size: 1.2em; margin-bottom: 10px;\">Stage 3: Experiments on insulation systems<\/h3>\n<div style=\"border: 2px solid #ccc; background-color: #fff; padding: 20px; margin-bottom: 20px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;\">\n<div style=\"flex: 1; min-width: 300px;\">\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 5px;\">\n            Practical and technical experimentation on experimental models of created insulation systems.\n        <\/p>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 0; font-size: 0.95em;\">\n            <strong>Period:<\/strong> 30.10.2009 \u2013 30.11.2010<br \/>\n            <strong>Stage value:<\/strong> 191,442 lei (Budget: 151,442 lei | Co-financing: 40,000 lei)<br \/>\n            <strong>Distribution:<\/strong> ICMET (32,500 budget + 60,000 cof.), Univ. Craiova (49,500 budget), Univ. Pitesti (18,500 budget).\n        <\/p>\n<\/p><\/div>\n<div>\n        <a href=\"https:\/\/icmet.wattmedia.ro\/wp-content\/uploads\/2026\/02\/proiect-sd-icmet-craiova-spectroscopia-dielectrica-etapa-3-modele-experimentale-de-sisteme-de-izolatie.pdf\" target=\"_blank\" style=\"display: inline-block; background-color: #003366; color: #fff; padding: 12px 20px; text-decoration: none; font-weight: bold; border-radius: 4px; white-space: nowrap;\"><br \/>\n            <span style=\"margin-right: 8px;\">\ud83d\uddce<\/span> See Stage 3 report<br \/>\n        <\/a>\n    <\/div>\n<\/div>\n<h3 style=\"color: #cc0000; font-size: 1.2em; margin-bottom: 10px;\">Stage 4: Demonstration of functionality<\/h3>\n<div style=\"border: 2px solid #ccc; background-color: #f4f4f4; padding: 20px; margin-bottom: 40px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;\">\n<div style=\"flex: 1; min-width: 300px;\">\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 5px;\">\n            Demonstrating the functionality and utility of the technology model for investigating insulation. The technological basis is strictly advanced dielectric spectroscopy.\n        <\/p>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 0; font-size: 0.95em;\">\n            <strong>Period:<\/strong> 30.11.2010 &#8211; 30.09.2011<br \/>\n            <strong>Stage value:<\/strong> 371,052 lei (Budget: 311,052 lei | Co-financing: 60,000 lei)<br \/>\n            <strong>Distribution:<\/strong> ICMET (259,193 budget), Univ. Craiova (20,273 budget), Univ. Pitesti (31,586 budget), Retrasib (30,000 cof.), Electroputere (30,000 cof.).\n        <\/p>\n<\/p><\/div>\n<div>\n        <a href=\"https:\/\/icmet.wattmedia.ro\/wp-content\/uploads\/2026\/02\/proiect-sd-icmet-craiova-spectroscopia-dielectrica-etapa-4-demonstrarea-functionalitatii-si-utilitatii-modelului-de-tehnologie.pdf\" target=\"_blank\" style=\"display: inline-block; background-color: #003366; color: #fff; padding: 12px 20px; text-decoration: none; font-weight: bold; border-radius: 4px; white-space: nowrap;\"><br \/>\n            <span style=\"margin-right: 8px;\">\ud83d\uddce<\/span> See Stage 4 report<br \/>\n        <\/a>\n    <\/div>\n<\/div>\n<h2 style=\"color: #003366; margin-top: 40px; margin-bottom: 15px; border-bottom: 2px solid #ccc; padding-bottom: 5px;\">\n    Technical results of Stage 1<br \/>\n<\/h2>\n<div style=\"background-color: #fff; border: 1px solid #ddd; padding: 25px; margin-bottom: 30px; box-shadow: 0 2px 5px rgba(0,0,0,0.05);\">\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 0; margin-bottom: 10px;\">Influence of temperature and humidity<\/h4>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0;\">\n        The study analyzed the known techniques for an objective diagnosis of the equipment. The current methods are strongly influenced by environmental and aging factors. The temperature of the insulation radically changes the calculated moisture content in the system. The aging products dissolved in the oil visibly increase the conductivity of the entire insulation. They practically simulate the undesirable role of water in the degradation process.\n    <\/p>\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 15px; margin-bottom: 10px;\">Equipment geometry and dielectric response<\/h4>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0;\">\n        When the insulation has an unusual geometry, the accuracy of the moisture calculation drops sharply. The dielectric response is strongly influenced by oil barriers and channels. This response accurately indicates the moisture exclusively in the main insulation of the equipment. It is not very sensitive to the water content around the electrical conductors.\n    <\/p>\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 15px; margin-bottom: 10px;\">SDS, PDC and RVM analysis methods<\/h4>\n<p style=\"color: #444; line-height: 1.6; margin-top: 0; margin-bottom: 0;\">\n        The RVM analysis software is heavily dependent on the conductivity of the transformer oil. The PDC analysis is slightly influenced by the insulation geometry and temperature dependence. The frequency domain analysis (FDS) ensures optimal compensation for the insulation geometry. According to the FDS, the cellulose apparently dries faster with increasing measured temperature. The project established strict criteria for the selection of modeling software programs.\n    <\/p>\n<\/div>\n<h2 style=\"color: #003366; margin-top: 40px; margin-bottom: 15px; border-bottom: 2px solid #ccc; padding-bottom: 5px;\">\n    Technical results of Stage 2<br \/>\n<\/h2>\n<div style=\"background-color: #bcffbc; padding: 25px; border-left: 4px solid #cc0000; margin-bottom: 40px; box-shadow: 0 2px 5px rgba(0,0,0,0.05);\">\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 0; margin-bottom: 10px;\">Moisture distribution in solid insulation<\/h4>\n<p style=\"color: #333; line-height: 1.6; margin-top: 0;\">\n        The stage fully evaluated the water content of the paper-oil insulation of transformers. It was found that the relationship between water in the oil and solid depends on the temperature. Three types of insulating structures were identified inside the transformer. The thick structures represent half of the total mass of the existing cellulose insulation.\n    <\/p>\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 15px; margin-bottom: 10px;\">Cold and warm thin structures<\/h4>\n<p style=\"color: #333; line-height: 1.6; margin-top: 0;\">\n        Cold thin structures operate at the temperature of the oil inside the device enclosure. They represent almost a third of the total mass of cellulosic materials. They retain a huge amount of water, available for diurnal thermal migration. Hot thin structures operate at temperatures very close to those of the conductors.\n    <\/p>\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 15px; margin-bottom: 10px;\">Thermodynamic equilibrium and water diffusion<\/h4>\n<p style=\"color: #333; line-height: 1.6; margin-top: 0;\">\n        The equilibrium state depends on the temperature, geometry and humidity of the insulation studied. With increasing temperature, the solubility of water directly in the oil increases significantly. The absorption capacity of cellulose decreases, forcing water molecules to migrate. When the temperature decreases, cellulose materials immediately absorb water from the transformer oil.\n    <\/p>\n<h4 style=\"color: #003366; font-size: 1.1em; margin-top: 15px; margin-bottom: 10px;\">Mathematical model and experimental procedures<\/h4>\n<p style=\"color: #333; line-height: 1.6; margin-top: 0; margin-bottom: 0;\">\n        An advanced mathematical model for moisture diffusion in cellulose was presented. Strict procedures were developed for the preparation of each type of sample studied. The working procedures were optimized until the exact reproducibility of the results was obtained. The final conclusion was that all the optimal conditions for starting laboratory experiments were met.\n    <\/p>\n<\/div>\n<p><!-- ============================================================\n     SECTIUNE NOUA: ARHIVA DOCUMENTE - VERSIUNE ENGLEZA (icmet.ro)\n     2 PDF-uri identificate in inventarul icmet.ro\/eng\/\n     ============================================================ --><\/p>\n<h2 style=\"color: #003366; margin-top: 50px; margin-bottom: 15px; border-bottom: 3px solid #cc0000; padding-bottom: 8px;\">\n    Archive documents \u2013 English version (icmet.ro)<br \/>\n<\/h2>\n<div style=\"overflow-x: auto; margin-bottom: 40px;\">\n<table style=\"width: 100%; border-collapse: collapse; font-size: 0.93em; color: #333;\">\n<thead>\n<tr style=\"background-color: #003366;\">\n<th style=\"padding: 10px 12px; border: 1px solid #ddd; color: #fff; text-align: left;\">Document description<\/th>\n<th style=\"padding: 10px 12px; border: 1px solid #ddd; color: #fff; width: 160px; text-align: center;\">Download<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #fff;\">\n<td style=\"padding: 9px 12px; border: 1px solid #ddd;\">\n                    <svg style=\"vertical-align: middle; margin-right: 7px;\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6z\" stroke=\"#cc0000\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><polyline points=\"14 2 14 8 20 8\" stroke=\"#cc0000\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><br \/>\n                    Stage 3 (2009-2010) &#8211; Tests on experimental models of insulation systems\n                <\/td>\n<td style=\"padding: 9px 12px; border: 1px solid #ddd; text-align: center;\">\n                    <a href=\"https:\/\/icmet.ro\/eng\/sdEt3_e.pdf\" target=\"_blank\" style=\"display: inline-block; padding: 6px 14px; background-color: #cc0000; color: #fff; text-decoration: none; border-radius: 4px; font-weight: bold; font-size: 0.85em;\" onmouseover=\"this.style.backgroundColor='#003366'\" onmouseout=\"this.style.backgroundColor='#cc0000'\">Download PDF<\/a>\n                <\/td>\n<\/tr>\n<tr style=\"background-color: #f9f9f9;\">\n<td style=\"padding: 9px 12px; border: 1px solid #ddd;\">\n                    <svg style=\"vertical-align: middle; margin-right: 7px;\" width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6z\" stroke=\"#cc0000\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><polyline points=\"14 2 14 8 20 8\" stroke=\"#cc0000\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><br \/>\n                    Stage 4 (2010-2011) &#8211; Demonstration of functionality and utility of insulation investigation technology based on dielectric spectroscopy\n                <\/td>\n<td style=\"padding: 9px 12px; border: 1px solid #ddd; text-align: center;\">\n                    <a href=\"https:\/\/icmet.ro\/eng\/sdEt4_e.pdf\" target=\"_blank\" style=\"display: inline-block; padding: 6px 14px; background-color: #cc0000; color: #fff; text-decoration: none; border-radius: 4px; font-weight: bold; font-size: 0.85em;\" onmouseover=\"this.style.backgroundColor='#003366'\" onmouseout=\"this.style.backgroundColor='#cc0000'\">Download PDF<\/a>\n                <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Proiectul SD: Spectroscopia dielectrica pentru diagnosticarea izolatiei Director proiect: Ing. Dorin Popa (ICMET Craiova) Date generale ale proiectului de cercetare Titlul proiectului: Spectroscopia dielectrica &#8211; o tehnologie inovativa pentru diagnosticarea izolatiei echipamentelor energetice Acronim: SD (Contract: 22100\/01.10.2008) Perioada: 01.10.2008 &#8211; 29.07.2011 Program: Programul 4 &#8211; Parteneriate in domenii prioritare (Energie) Tip proiect: Proiect de Cercetare (PC) Valoare totala: 1.400.000 lei De la buget: 1.240.000 lei Cofinantare: 160.000 lei Consortiul de parteneri Contractor principal: ICMET Craiova (Dir. Ing. Dorin Popa) Autoritate Contractanta: Centrul National de Management Programe Partener 1: Universitatea din Craiova (Resp. Conf. dr. ing. Florian Stefanescu) Partener 2: Universitatea din Pitesti (Resp. Conf. dr. ing. Dumitru Cazacu) Rezumatul proiectului si tehnologia inovativa Provocarile izolatiei electrice Izolatia electrica a echipamentelor energetice sufera un proces continuu de imbatranire in conditii normale. Ea se degradeaza sever ca urmare a solicitarilor termice si electrice din retea. Imbatranirea conduce direct la reducerea drastica a duratei de viata. In multe cazuri apar defecte care afecteaza functionarea sigura a sistemului energetic. Acest sistem asigura transmisia si distributia vitala a energiei electrice. Cercetarea actuala este directionata spre o intelegere mult mai buna a fenomenului de imbatranire. Scopul este gasirea de noi tehnologii avansate de diagnosticare a izolatiei. Dorim o estimare corecta a duratei de viata ramasa pentru echipamente. Pe plan mondial sunt aplicate deja mai multe tipuri de mentenanta preventiva. Ele asigura securitatea functionarii sistemului cu costuri financiare cat mai mici. Spectroscopia dielectrica aplicata Un prim pas a fost selectarea metodelor de investigare a starii izolatiei electrice. Au fost alese metode care aduc informatii complet obiective si extrem de precise. Am selectat analiza gazelor dizolvate in ulei pentru etapa vitala de prevenire. Am ales masurarea descarcarilor partiale pentru evidentierea defectelor grave din sistem. Proiectul abordeaza o metoda tehnologica complet noua si revolutionara in domeniu. Utilizam analiza in domeniul frecventa a raspunsului izolatiei studiate. Aceasta evidentiaza perfect defectele incipiente si apreciaza exact durata de viata ramasa. Metoda este mult mai putin influentata de variatia temperaturii de lucru. De asemenea, nu este afectata de geometria complexa a echipamentului expertizat. Vom utiliza modelarea asistata de calculator si experimentari fizice in laborator. Testele se fac pe machete de izolatie cu grade presetate de infestare severa. Se vor determina precis pierderile dielectrice in functie de frecventa aplicata. Evaluam starea functionala a izolatiei prin comparare directa in timpul diagnosticarii. Procedura va fi validata prin masurari efective pe transformatoare de putere si masura. Testele se fac atat in laborator cat si in regim on-site. Etapele de executie ale proiectului Etapa 1: Studiul tehnicilor de masurare Studiul tehnicilor de masurare pentru analiza dielectricilor. Perioada: 01.10.2008 &#8211; 27.02.2009 Valoare etapa: 160.500 lei (Buget: 100.500 lei | Cofinantare: 60.000 lei) Repartizare: ICMET (32.500 buget + 60.000 cof.), Univ. Craiova (49.500 buget), Univ. Pitesti (18.500 buget). Etapa 2: Elaborarea modelelor experimentale Elaborarea modelelor experimentale de sisteme de izolatie cu grade diferite de infestare. Modelam imbatranirea termica si electrica in conditii de laborator. Perioada: 01.03.2009 &#8211; 30.10.2009 Valoare etapa: 59.930 lei (Buget: 59.930 lei | Cofinantare: 0 lei) Repartizare: ICMET Craiova (59.930 lei buget). Etapa 3: Experimentari pe sisteme de izolatie Experimentari practice si tehnice pe modelele experimentale de sisteme de izolatie create. Perioada: 30.10.2009 &#8211; 30.11.2010 Valoare etapa: 191.442 lei (Buget: 151.442 lei | Cofinantare: 40.000 lei) Repartizare: ICMET (32.500 buget + 60.000 cof.), Univ. Craiova (49.500 buget), Univ. Pitesti (18.500 buget). &#128462; Vezi raport Etapa 3 Etapa 4: Demonstrarea functionalitatii Demonstrarea functionalitatii si utilitatii modelului de tehnologie pentru investigarea izolatiei. Baza tehnologica este strict spectroscopia dielectrica avansata. Perioada: 30.11.2010 &#8211; 30.09.2011 Valoare etapa: 371.052 lei (Buget: 311.052 lei | Cofinantare: 60.000 lei) Repartizare: ICMET (259.193 buget), Univ. Craiova (20.273 buget), Univ. Pitesti (31.586 buget), Retrasib (30.000 cof.), Electroputere (30.000 cof.). &#128462; Vezi raport Etapa 4 Rezultatele tehnice ale Etapei 1 Influenta temperaturii si a umiditatii Studiul a analizat tehnicile cunoscute pentru o diagnosticare obiectiva a echipamentelor. Metodele actuale sunt puternic influentate de factori de mediu si de imbatranire. Temperatura izolatiei schimba radical continutul de umezeala calculat in sistem. Produsele de imbatranire dizolvate in ulei cresc vizibil conductivitatea intregii izolatii. Ele simuleaza practic rolul nedorit al apei in procesul de degradare. Geometria echipamentului si raspunsul dielectric Cand izolatia are o geometrie neuzuala, precizia calculului de umiditate scade brusc. Raspunsul dielectricului este puternic influentat de barierele si canalele de ulei. Acest raspuns indica precis umiditatea exclusiv din izolatia principala a echipamentului. El nu este foarte sensibil la continutul de apa din jurul conductoarelor electrice. Metode de analiza FDS, PDC si RVM Software-ul de analiza RVM depinde masiv de conductivitatea uleiului din transformator. Analiza PDC este putin influentata de geometria izolatiei si dependenta de temperatura. Analiza in domeniul frecventei (FDS) asigura compensarea optima a geometriei izolatiei. Conform FDS, celuloza se usuca aparent mai repede cu cresterea temperaturii masurate. Proiectul a stabilit criterii stricte pentru selectia programelor software de modelare. Rezultatele tehnice ale Etapei 2 Distributia umiditatii in izolatia solida Etapa a evaluat complet continutul de apa din izolatia hartie-ulei a transformatoarelor. S-a constatat ca relatia dintre apa din ulei si cea solida depinde de temperatura. Au fost identificate trei tipuri de structuri izolatoare in interiorul transformatorului. Structurile groase reprezinta jumatate din masa totala a izolatiei celulozice existente. Structurile subtiri reci si calde Structurile subtiri reci functioneaza la temperatura uleiului din interiorul incintei aparatului. Acestea reprezinta aproape o treime din masa totala a materialelor celulozice. Ele retin o cantitate uriasa de apa, disponibila pentru migratia termica diurna. Structurile subtiri calde functioneaza la temperaturi foarte apropiate de cele ale conductoarelor. Echilibrul termodinamic si difuzia apei Starea de echilibru depinde de temperatura, geometria si umiditatea izolatiei studiate. Odata cu cresterea temperaturii creste mult solubilitatea apei direct in ulei. Capacitatea de absortie a celulozei scade, fortand moleculele de apa sa migreze. La scaderea temperaturii, materialele din celuloza absorb imediat apa din uleiul transformatorului. Model matematic si proceduri experimentale A fost prezentat un model matematic avansat pentru difuzia umiditatii in celuloza. Au fost elaborate proceduri stricte de pregatire a fiecarui tip de mostra studiata. S-au optimizat procedurile de lucru pana la obtinerea reproductibilitatii exacte [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3626,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3706","page","type-page","status-publish","hentry","post-no-thumbnail"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Proiect SD ICMET Craiova - Spectroscopia Dielectrica<\/title>\n<meta name=\"description\" content=\"Afla toate detaliile despre noul proiect sd icmet craiova. 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