2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)最新文献_第6页

The History and Significance of the Carbon Oxide Ratio 碳氧比的历史和意义

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796815

Randy Cox

引用次数: 1

A SERS Substrate For Detecting Methanol In Transformer Oil 一种检测变压器油中甲醇的SERS底物

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796557

Shuhua Zhang, Weigen Chen, Fu Wan, Haiyang Shi, Weiran Zhou, Jiayi Zhang, Chengzhi Zhu

引用次数: 0

Investigation of the factors affecting the dielectric dissipation factor of synthetic and natural esters 影响合成酯和天然酯介电耗散系数的因素研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796834

P. Livesey, M. Lashbrook, Russell Martin

{"title":"Investigation of the factors affecting the dielectric dissipation factor of synthetic and natural esters","authors":"P. Livesey, M. Lashbrook, Russell Martin","doi":"10.1109/ICDL.2019.8796834","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796834","url":null,"abstract":"Traditionally, mineral oil has been used as the insulating liquid in transformers due to its high electrical breakdown strength and cooling ability. More recently, natural and synthetic ester based dielectric liquids are increasingly adopted as alternatives, offering much improved fire safety and environmental protection. The dielectric dissipation factor (DDF), via tan delta measurement, has traditionally been used as one of the key metrics for quality evaluation of unused transformer mineral oils. Understanding the chemical differences between esters and mineral oil and which factors affect material properties such as ester DDF is rapidly becoming of greater importance. By monitoring the individual effects of increased ambient temperature and UV exposure on the DDF of synthetic and natural esters, this investigation aims to provide data which can be used to refine interpretation of dielectric dissipation factor for esters. The overall condition of high DDF esters, and the implications this could have for a transformer, are also evaluated to allow conclusions to be drawn on the relevance of a DDF limit in ester standards.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"25 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":"134568861","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

Study on temperature distribution in oil-immersed inverted current transformer 油浸式逆变电流互感器温度分布研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796597

Xiaoping Yang, Yiming Wu, Jiansheng Li, Chao Wei, Shengquan Wang, Leifeng Huang, Bonan Li, Youyuan Wang

{"title":"Study on temperature distribution in oil-immersed inverted current transformer","authors":"Xiaoping Yang, Yiming Wu, Jiansheng Li, Chao Wei, Shengquan Wang, Leifeng Huang, Bonan Li, Youyuan Wang","doi":"10.1109/ICDL.2019.8796597","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796597","url":null,"abstract":"Oil-immersed inverted current transformer, as an important electrical equipment in power grid, is mainly used in power plants and substations. Accidents caused by oil-immersed inverted current transformers are generally accompanied by explosions, which not only reduce the amount of electricity delivered, but also damage other nearby equipment in the substation and even cause casualties. Therefore, it is very necessary to detect and evaluate the operation status of oil-immersed inverted current transformer and study the fault prevention technology to reduce the probability of accidents. According to the common faults of oil-immersed inverted current transformer, this paper firstly analyzed the parts and components with high fault rate of current transformer. Combined with the operating condition of current transformer and its internal insulation structure, the internal temperature field simulation model of current transformer and the temperature calculation model of key parts were established. It was found that the temperature near the winding of the oil-immersed inverted current transformer was the highest, while the temperature rise at the lower part far from the heat source was very small. The simulation results were basically consistent with the experimental results, and it was found that the temperature distribution on both sides of the primary conductor in the head region of the current transformer was symmetrical.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"363 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":"124565696","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: 0

The theoretical study of dielectric properties of water using the modified Onsager-Kirkwood-Fröhlich theory 修正Onsager-Kirkwood-Fröhlich理论对水介电特性的理论研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796591

D. Putintsev, N. M. Putintsev

{"title":"The theoretical study of dielectric properties of water using the modified Onsager-Kirkwood-Fröhlich theory","authors":"D. Putintsev, N. M. Putintsev","doi":"10.1109/ICDL.2019.8796591","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796591","url":null,"abstract":"In the work, we present the new method for calculation dielectric properties for Water in the wide temperature range. We use the modified Onsager-Kirkwood-Fröhlich theory, which makes it possible to calculate the polarization characteristics without using the static permittivity. We assumed that the dielectric is an isotropic medium consisting of molecules that do not interact with each other and are located in molecular electric fields. It allows us to use the average cosine of the angle between local electric field vectors and the dipole moment vectors of molecules in a medium as the average measure of the local orientation of the dipoles. This approach also makes it possible to equate the value of the energy of the interaction of dipoles with molecular fields to the value of the internal interaction energy if the energy of the interaction of the dipoles with external fields used for the experimental determination of the value of static permittivity is much less than the energy of the interaction. The calculated values of the dipole moment agree with the modern quantum mechanical calculations, and the results of calculating the values of permittivity are in practical agreement with experiment in the wide range of123.15K-573.15K. The method allows to calculate the static permittivity of water in various aggregate states: ice Ih in the range from 123K to melting point, supercooled water in the range from 238K to melting point, water at the saturation line from the melting point to the precritical region.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"19 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":"127986265","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: 0

Transport of Heat and Mass with Electrical Field - from Earth to Space 带电场的热量和质量输运——从地球到太空

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796729

J. Yagoobi

引用次数: 0

Comparison of X-Wax Formation in Different Insulation Liquids 不同绝缘液体中x -蜡形成的比较

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796699

M. Kuhnke, K. Homeier, P. Werle

{"title":"Comparison of X-Wax Formation in Different Insulation Liquids","authors":"M. Kuhnke, K. Homeier, P. Werle","doi":"10.1109/ICDL.2019.8796699","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796699","url":null,"abstract":"The formation of solid wax-like ageing products in mineral oil under high voltage stress is known for almost a century. It was observed in oil-impregnated cables, bushings and capacitors. Its formation was generally attributed to high field strength and partial discharges. Since these types of equipment do not rely on oil flow for cooling the wax formation was seen as a sign of wear and not by itself as threat to the equipment.With the improvement of materials and design tools, the field strength in transformers increased. In recent years there was a significant number of outages in distribution transformers, which were related to partial discharges and wax formation. The purpose of this research is to understand how this wax is formed and how different insulation liquids behave in regard to the wax formation. Observations from the investigation of faulty transformers are compared to a lab experiment. A scaled model of the high voltage insulation of a distribution transformer was designed and build to investigate the influence of temperature and partial discharges on the generation of waxlike substances in the laboratory. Different insulation fluids, such as synthetic and natural esters and silicone fluids are investigated as well as a mineral oil for comparison. They are stressed with partial discharges for a duration of 200h. The partial discharges are monitored to allow a comparison between the PD energy and the amount of wax formed during the experiment. The tests are performed at different temperatures, as previous investigations have shown a significant influence of the temperature.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"5 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":"114356530","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

New equation for calculating electronic polarizability using refractometry 用折射法计算电子极化率的新方程

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796562

D. Putintsev, N. M. Putintsev

引用次数: 0

Reliability Study of Furan Level Analysis for Transformer Health Prediction 变压器健康预测中呋喃水平分析的可靠性研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796785

M. Meissner, Martin Darmann, S. Schober, M. Mittelbach, C. Sumereder

{"title":"Reliability Study of Furan Level Analysis for Transformer Health Prediction","authors":"M. Meissner, Martin Darmann, S. Schober, M. Mittelbach, C. Sumereder","doi":"10.1109/ICDL.2019.8796785","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796785","url":null,"abstract":"To determine the reliability of furan compound analysis for insulation-system health prediction, the furan level found in oil, paper and pressboard was monitored throughout a large-scale ageing study. Therefore, thermally upgraded and normal Kraft paper as well as transformer pressboard were immersed in 4 different types of insulation liquid (mineral oil, G-t-L oil, synthetic and natural ester) at 3 different ageing temperatures (110, 130 and $150^{circ}mathrm{C})$ and studied throughout a 56 day ageing setup, resulting in 100 mixed samples and 300 furan analyses. While the evolution of furan compounds in each system was somehow steady, comparisons between different material mixes and temperatures show significant aberrations. For similar stages of wear, standard deviations of 100% and more are detectable for the total furan compound concentration in oil, while deviations in solid insulation materials can be even higher. Due to the complexity and high number of variables, irregular analysis intervals without supporting information seem to be highly arguable for transformer health prediction.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"2014 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":"128185087","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: 5

Investigation of Temperature Effect on Conductance Characteristics of Transformer Oil-based Nanofluids 温度对变压器油基纳米流体电导特性影响的研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796575

Ming Dong Xinyi, Xinyi Ma, Yang Li, Jiacheng Xie, M. Ren

{"title":"Investigation of Temperature Effect on Conductance Characteristics of Transformer Oil-based Nanofluids","authors":"Ming Dong Xinyi, Xinyi Ma, Yang Li, Jiacheng Xie, M. Ren","doi":"10.1109/ICDL.2019.8796575","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796575","url":null,"abstract":"Adding some nanoparticles to the transformer oil can improve its heat exchange properties as well as its dielectric withstanding characteristics, which has attract more and more attentions in the world. The conductance characteristics of transformer oil-based nanofluids (TNFs), especially at different temperatures, will help to understand the modification theory. The charge carrier transport processes at different electric fields can be divided into three stages: Ohmic, tunneling and space charge limited current (SCLC), respectively. In Ohmic stage at a very low field, the addition of nanoparticles increases the carrier number density, thus the conduction current is increased. In tunneling stage at medium to high electric field strengths, the main charge carriers in the transformer oil change from ions and colloidal particles to electrons emitted from the electrodes. The addition of nanoparticles increases the barrier thickness at the metal-liquid interface, which reduces the amount of electrons passing through the interface region. Therefore, the field strength required for electron transport is enhanced, and the dielectric strength is improved. In the space charge limited current stage at a very high electric field, the large trap density of TNFs lowers the carrier mobility, suppressing the discharge. In addition, as the temperature increases, the accelerated movement of the carriers increases the conduction current in the transformer oil. However, the electron tunneling process in the tunneling stage is little affected by the change in temperature.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"24 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":"126672853","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: 0