2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)最新文献_第9页

The effects of TiO2 nanoparticles on insulation and charge transport characteristics of aged transformer oil TiO2纳米粒子对老化变压器油绝缘和电荷输运特性的影响

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796677

Zhen Sun, Y. Ge, Y. Lv, Meng Huang, Chengrong Li, Yue-fan Du

{"title":"The effects of TiO2 nanoparticles on insulation and charge transport characteristics of aged transformer oil","authors":"Zhen Sun, Y. Ge, Y. Lv, Meng Huang, Chengrong Li, Yue-fan Du","doi":"10.1109/ICDL.2019.8796677","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796677","url":null,"abstract":"The insulation property of transformer oil is prone to decreasing due to insulation aging caused by the heat, electricity and other factors under the long-term operation, which is vital to the safe operation of power equipment. It has been reported that nanoparticles can improve the insulation properties of transformer oil. However, there has been no evidence showing the effect of nanoparticles on insulation properties of aging transformer oil, and the modified mechanism of nanoparticles is not clear. To reveal the modified mechanism of nanoparticles on aging transformer oil, this paper presents the effects of TiO2 nanoparticles on the insulating properties, space charge characteristics and trap characteristics of aged transformer oil. The results show that the insulation properties of transformer oil with different aging degree are improved by adding TiO2 nanoparticles. The AC breakdown voltage of aged nanofluid is increased significantly to the one of non-aging transformer oil. The lightning impulse breakdown voltage is increased by 30%∼40%. Besides, the partial discharge inception voltage is increased by 12%. Moreover, the space charge characteristics measuring by the pulse electro-acoustic technique show that the charge dissipation rate of the aged transformer oil is increased by 57% with the presence of TiO2 nanoparticles, which reduces the accumulation of space charges. The thermally stimulation current shows that more traps with shallower energy level are induced by TiO2 nanoparticles. The charge trapping and de-trapping process in shallow traps are beneficial to the rapid dissipation of charges and restrains the accumulation of space charges. Therefore, TiO2 nanoparticles can effectively modify the charge accumulation and dissipation characteristics in aging transformer oil and significantly reduce the distortion of electric field, resulting in the improvement of the insulation property.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123043719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Conditions for Explosive Growth of Free Surface Perturbations for a Dielectric Liquid in a Normal Electric Field in Confined Axisymmetric Geometry 介电液体在法向电场中自由表面微扰爆炸生长的条件

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796563

K. Bobrov, N. Zubarev, O. Zubareva

引用次数: 0

Corrosions & PCBs: Inventory, Diagnostics and Treatments of Oils and Transformers 腐蚀和多氯联苯:库存，诊断和油和变压器的处理

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796846

V. Tumiatti, M. Tumiatti, Cristina Tumiatti, Simone Maina, R. Maina, Riccardo Actis

{"title":"Corrosions & PCBs: Inventory, Diagnostics and Treatments of Oils and Transformers","authors":"V. Tumiatti, M. Tumiatti, Cristina Tumiatti, Simone Maina, R. Maina, Riccardo Actis","doi":"10.1109/ICDL.2019.8796846","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796846","url":null,"abstract":"This paper describes the “State of the Art” for inventory, diagnostic, prognostic and integrated treatment of electrical equipment and insulating liquids containing DBDS/Corrosions & PCBs (Tech Pathologies).The Corrosions determine a functional risks for transformers and equipment filled with mineral insulating oils: C1-DBDS & Corrosive Sulfur; C2-NOT DBDS & Corrosive Sulfur; C3-.SCBP & Corrosive Sulfur; C4-NOT Corrosive Sulfur & Metal Dissolution. The PolyChlorinatedBiphenyls (PCBs) are a “Persistent Organic Pollutants” (POPS), as “Class 1.Cancerogenic to humans (IARC 2013) and determine risks for workers, public health and environment.The oils & transformers integrated treatments, PCBs dehalogenation technique (“DMU & CDP Process” patented by Sea Marconi) and DBDS Selective Depolarization, in continuous mode through a closed circuit process are the sustainable solutions (Therapies) based on “circular economy”.These solutions are based on the use of Smart Decontamination Modular Units (DMUs) and a solid reagent, consisting of a higher molecular weight glycol compounds, a mixture of bases and radical promoter or other catalyst on a high surface area particulate support. These processes normally run at $80- 100^{circ}C$ and have the capability to decontaminate equipment on-site through continuous circulation of the oil in a closed system (without draining the oil or using auxiliary tanks), using the solvent capability of the oil for continuous extraction of PCBs and DBDS from solid materials inside the equipment (according IEC 60422 art. 11.4.4).International experience of diagnostic, prognostic and integrated treatments are presented according to IEC & CENELEC include On -Load treatments in power transformers and shunt reactors, in several countries.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117250599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Kraft And Diamond Dotted Paper Thermally Aged In Mineral Oil And Natural Ester: Mechanical Characterisation 在矿物油和天然酯中热老化的牛皮纸和菱形点纸:力学特性

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796691

C. Fernández-Diego, A. Ortiz, I. Carrascal, I. Fernández, F. Delgado, C. Olmo

{"title":"Kraft And Diamond Dotted Paper Thermally Aged In Mineral Oil And Natural Ester: Mechanical Characterisation","authors":"C. Fernández-Diego, A. Ortiz, I. Carrascal, I. Fernández, F. Delgado, C. Olmo","doi":"10.1109/ICDL.2019.8796691","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796691","url":null,"abstract":"Oil-immersed transformers, whose lifespan is defined by cellulose insulation’s lifetime, utilize frequently mineral oil. However, this insulating fluid is being replaced by alternative liquids such as natural and synthetic esters. This replacement requires to guarantee a similar behavior of solid insulating materials immersed in them. Although there are different authors who have concluded that Kraft paper reduces its deterioration rate when it is immersed in biodegradable fluids, there are few works that have analyzed the effect of insulation liquids on the mechanical properties of other cellulosic materials such as diamond dotted paper (DDP) during laboratory tests. This paper shows a comparative analysis of four paper/oil specimens (a standard Kraft paper and a diamond dotted paper aged in both mineral oil and natural ester) under controlled laboratory accelerated thermal ageing. This work focuses on changes in mechanical properties such as the energy consumed per unit volume of the failure zone ($text{E}_{mathbf {R}}$), rupture strength ($sigma _{mathbf {R}}$) and strain under ultimate strength ($varepsilon _{mathbf {cm}}$).","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117309071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis on Extending Service Life of Aged Transformers by Oil Replacement with Novel 3-Element Mixed Insulation Oil 新型三元混合绝缘油换油延长老化变压器使用寿命的分析

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796704

Dawei Feng, J. Hao, R. Liao, Xin Chen, Xiong Liu, Tao Yang

{"title":"Analysis on Extending Service Life of Aged Transformers by Oil Replacement with Novel 3-Element Mixed Insulation Oil","authors":"Dawei Feng, J. Hao, R. Liao, Xin Chen, Xiong Liu, Tao Yang","doi":"10.1109/ICDL.2019.8796704","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796704","url":null,"abstract":"Oil-paper composite insulation is the key parameter affecting the overall performance and service life of transformers, and it gradually ages with the operation time. In order to extend the aging lifespan of transformers, scholars all over the world have spared no effort to delay the aging rate of the insulation paper. Recently, our group has proposed a novel 3-element mixed insulation oil, whose main parameters meet the current IEC 60296-2012 standard for mineral oil, indicating the novel 3-element mixed insulation oil can be used for replacing mineral oil directly. In this paper, different oilpaper systems which consist of 3-element mixed insulation oil, mineral oil and Kraft paper, were used for accelerating thermal aging test at $130^{circ}C$. In the middle aging period, aged mineral oil in some samples was replaced with new mineral oil and 3-element mixed insulation oil respectively, and then the accelerating thermal aging test continued. Comparison on thermal aging rate and AC breakdown of oil shows that the 3element mixed insulation oil could not only keep excellent insulation property in aging process after oil replacement, but also indeed decrease the thermal aging rate of aged insulation paper. Oil replacement with 3-element mixed insulation oil increases 1.5 times aging lifespan of insulation paper in the thermal aging experiment, which suggests that the service life of aged transformer may be extended by oil replacement with the novel 3-element mixed insulation oil.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115306367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Comparison of Dissolved Gases in Natural Ester under Partial Discharges 部分放电条件下天然酯中溶解气体的比较

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796571

Korraya Jongvilaikasem, S. Maneerot, K. Jariyanurat, N. Pattanadech

{"title":"Comparison of Dissolved Gases in Natural Ester under Partial Discharges","authors":"Korraya Jongvilaikasem, S. Maneerot, K. Jariyanurat, N. Pattanadech","doi":"10.1109/ICDL.2019.8796571","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796571","url":null,"abstract":"Currently, natural ester is alternative liquid insulation applied for both distribution and power transformers. Generally, transformers are expected to operate stably and reliably. However, their functions may fail during operation. Dissolved gases analysis is one of the worldwide accepted diagnostic techniques to examine the insulation integrity of the transformers. This paper presents the analysis of dissolved gases generated from partial discharge (PD) experiments i.e. corona discharge, surface discharge and internal discharge which were conducted in the test cell filled with natural ester (FR3). To simulate corona discharge, a needle electrode with a tip radius of 10, 20, and 40 micrometers was used as high voltage electrode and the plane electrode with a diameter of 45 mm was used as a grounded electrode. The gap distance was fixed at 32 mm. The corona discharge experiment was performed for 2 hours at the test voltage level of 35, 40, 45 kV respectively. In case of surface discharge, the pressboard samples i.e. non-impregnated pressboards, 8-hour impregnated pressboards, and 16-hour impregnated pressboards were inserted between the 20-micrometer tip radius needle and grounded plane. Then, the test voltage of 25 kV was applied to the electrode system for 1 hour. Besides, the surface discharge was tested at 35 and 45 kV respectively. For internal discharge, the pressboard samples i.e. non-impregnated pressboards, 8-hour impregnated pressboards, and 16-hour impregnated pressboards were inserted between the plane-plane electrodes. Then the test voltage of 25 kV was applied to the electrode system for 1 hour. Moreover, the internal discharge was tested also at 35 and 45 kV. Their natural ester samples were sampling from the test cell for each experiment and the dissolved gases were measured and analyzed. From the test results, it was found that the types and quantity of dissolved gases depended strongly on the type of discharge and material samples.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130885407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of Cumyl Alcohol in Multilayer Dielectric on Space Charge Build Up 多层介质中异丙醇对空间电荷积累的影响

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796775

Benny Reinmart, G. Teyssèdre, S. Le Roy, N. Sinisuka

引用次数: 0

PIV Flow Measurements of Conduction Pumping Flow Created by Nine Pairs of Asymmetric Surface Electrodes 九对非对称表面电极产生的传导泵送流的PIV流量测量

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796777

C. Louste, P. Traoré, P. Vázquez, J. Seyed Yagoobi

引用次数: 4

Time-dependent dielectric behavior of mineral oil under the influence of different DC voltage conditions 不同直流电压条件下矿物油介电特性随时间的变化

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796584

H. Öftering, Patrick Rumpelt, A. Küchler, F. Jenau, R. Fritsche

引用次数: 1

The Relationship Between the Physical, Chemical, and Functional Properties of Insulating Liquids 绝缘液体的物理、化学和功能特性之间的关系

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796726

Edward Casserly

引用次数: 0