2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)最新文献

Extraction of low molecular weight acids from transformer liquids using water extraction technique 水萃取法从变压器液中提取低分子量酸

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-07-02 DOI: 10.1109/ICPADM.2018.8401218

Z. W. Yan, S. Matharage, Q. Liu, Z. Wang

{"title":"Extraction of low molecular weight acids from transformer liquids using water extraction technique","authors":"Z. W. Yan, S. Matharage, Q. Liu, Z. Wang","doi":"10.1109/ICPADM.2018.8401218","DOIUrl":"https://doi.org/10.1109/ICPADM.2018.8401218","url":null,"abstract":"Acidity has been recognised to be an excellent marker of the transformer insulation system. In the recent decade, a sub-group of the acids, known as low molecular weight acids (LMA), have been identified to be the cause of acid catalysed degradation of the paper insulation. Due to the unavailability of a standard method, LMA in transformer oil is commonly measured through a water-extraction process where LMA is extracted into water prior to the titration. This contribution investigates the effects of some key parameters of the extraction process including stirring speed, stirring duration and the separation period. Experiments are conducted with two types of transformer liquids including a mineral oil and a synthetic ester. Results indicate that the best extraction efficiency for the transformer liquids can be reached at a stirring speed of 650 rpm. Furthermore, it is found that the LMA extraction is completed within 1 hour and 3 hours of stirring for the mineral oil and the synthetic ester, respectively. The mineral oil had higher LMA extracted in water than the synthetic ester in a wide range of initial acidity concentration. This is due to a residual amount of LMA remaining in the ester liquid irrespective of the initial acidity.","PeriodicalId":268745,"journal":{"name":"2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124131330","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

Natural ester FR3 insulating liquid — Very paper friendly 天然酯FR3绝缘液体-非常友好的纸张

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401265

E. Pagger, M. Muhr, R. Braunstein, Michael Tieber, K. Rapp, A. Sbravati

引用次数: 2

The influence of the molecular architecture on the thermal and the dielectric properties of epoxy resin networks 分子结构对环氧树脂网络热性能和介电性能的影响

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401056

I. A. Saeedi, T. Andritsch, A. Vaughan, D. J. Salter

{"title":"The influence of the molecular architecture on the thermal and the dielectric properties of epoxy resin networks","authors":"I. A. Saeedi, T. Andritsch, A. Vaughan, D. J. Salter","doi":"10.1109/ICPADM.2018.8401056","DOIUrl":"https://doi.org/10.1109/ICPADM.2018.8401056","url":null,"abstract":"Epoxy resins are used as the base insulating material in many electrical applications, including cast resin transformers, bushings and cable terminations. The performance of the resin-based insulation governs the efficiency of these applications. To understand the factors that determine the different properties of epoxy resin insulating materials, in this work, we studied the thermal and electrical properties of amine and anhydride cured epoxy resin systems. The glass transition temperature Tg, permittivity and breakdown strength of three resin systems were investigated. The results of differential scanning calorimetry indicated that the Tg of the tested system is related to the free volume in the system, which is affected by the degree of cross linking. The extent of reactions between the resin and the hardener (or the crosslinking) is ascribed to the reaction mechanisms between the active group of the hardener and the epoxide groups of the resin. Dielectric spectroscopy revealed a standard beta relaxation in the imaginary permittivity of all systems. The strength of the beta relaxation is related to the formation of hydroxyl groups and the local structure around the crosslinking which may constrain the movement of the -OH groups. This research provides insights concerning the relations between the curing mechanisms and the thermal and electrical properties; this, consequently, represents a potential mean of tailoring the overall performance of epoxy resin systems to suit particular applications.","PeriodicalId":268745,"journal":{"name":"2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122221503","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: 7

Effect of voltage reversal on space charge in oil and oil-impregnated pressboard under temperature gradient 温度梯度下电压反转对油浸压板内空间电荷的影响

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401112

Bo Huang, M. Hao, Zhiqiang Xu, George Chen, Chao Tang

引用次数: 4

Partial discharge multispectral detection in air with a SiPM-based sensor 基于sipm传感器的空气局部放电多光谱检测

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401141

Jierui Zhou, M. Ren, Wenguang Huang, Chongxing Zhang, M. Dong, U. Schichler

{"title":"Partial discharge multispectral detection in air with a SiPM-based sensor","authors":"Jierui Zhou, M. Ren, Wenguang Huang, Chongxing Zhang, M. Dong, U. Schichler","doi":"10.1109/ICPADM.2018.8401141","DOIUrl":"https://doi.org/10.1109/ICPADM.2018.8401141","url":null,"abstract":"Partial discharge (PD) is one of the reasons for the insulation deterioration in power equipment. As an intrinsic PD characterization method, optical detection is always just employed as a tool for laboratory study. With the development of solid-state photosensitive semiconductor device, it provides the possibility for implanting tiny photosensitive devices within the power equipment. In this paper, a SiPM-based PD light detector was designed for power supply and eliciting signal from SiPM. In order to compare the SiPM with other traditional PD detection methods, a synchronous PD measurement system was built to detect PD in optical and electrical method simultaneously. In addition, the PD light signals at different spectrum were detected by adding filters on the surface of SiPM. The results show that that SiPM has the same PD detection ability as that of high frequency current transformer (HFCT) and photomultiplier tube (PMT). There are some differences in the proportions of spectral components obtained by SiPM for different insulation defects, which provides an insight for insulation status evaluation.","PeriodicalId":268745,"journal":{"name":"2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124399494","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

Influence of hydrophilic conductor surface treatments on OHL audible noise 亲水性导体表面处理对OHL可听噪声的影响

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401081

O. Pischler, U. Schichler

{"title":"Influence of hydrophilic conductor surface treatments on OHL audible noise","authors":"O. Pischler, U. Schichler","doi":"10.1109/ICPADM.2018.8401081","DOIUrl":"https://doi.org/10.1109/ICPADM.2018.8401081","url":null,"abstract":"Both the ever increasing demand for energy as well as the current change in power generation strategies necessitate a constant augmentation of overall overhead line transmission capacity. However, neither the construction of new overhead lines nor the refurbishment of existing ones is ever met with a lot of acceptance. One of the most annoying side effects associated with power lines is audible noise, which often occurs along overhead lines during foul weather. These noise emissions are caused by corona effects which in return are abetted by water droplets deposited on the conductor ropes. As research has shown, new conductor ropes are much more prone to this effect than well aged ones. This is a fundamental problem frequently encountered during the commissioning of new lines and the refurbishment of existing ones. Adequate ways of mitigation must be found to ensure a minimum of opposition towards planned reinforcements of the overhead transmission line system. To be able to assess the different concepts for corona noise reduction comprehensively, this paper discusses the underlying mechanisms. Furthermore, various corrective measures with the focus on hydrophilic conductor surface treatments, which strive to reduce the development of corona-inducing water droplets, are introduced. To investigate their effectiveness extensive laboratory tests with variously treated conductor ropes were carried out in a high voltage laboratory. During all measurements increased efforts to ensure a constant and realistic artificial rain rate were made. For this a specifically developed rainfall simulator was used.","PeriodicalId":268745,"journal":{"name":"2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132704789","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

Performance of nanoparticles in the electrical behavior of DC capacitor films 纳米粒子在直流电容器薄膜电性能中的作用

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401024

G. Montanari, P. Seri, Mikael Ritamäki, K. Lahti, I. Rytöluoto, M. Paajanen

引用次数: 13

Terahertz time-domain spectroscopic analyses on crystallinity of several organic polymers 几种有机聚合物结晶度的太赫兹时域光谱分析

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-06-29 DOI: 10.1109/ICPADM.2018.8401083

Y. Ohki, Chisato Azeyanagi, T. Kaneko, N. Hirai

引用次数: 0

Challenges resulting from the use of spark gaps for superimposed voltage tests 使用火花间隙进行叠加电压测试带来的挑战

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-05-21 DOI: 10.1109/ICPADM.2018.8401142

O. Pischler, U. Schichler

引用次数: 3

Partial discharges of defects in different insulating gases: N2, CO2, dry air and SF6 不同绝缘气体:N2、CO2、干燥空气、SF6中缺陷的局部放电

2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 2018-05-21 DOI: 10.1109/ICPADM.2018.8401150

A. Pirker, U. Schichler

{"title":"Partial discharges of defects in different insulating gases: N2, CO2, dry air and SF6","authors":"A. Pirker, U. Schichler","doi":"10.1109/ICPADM.2018.8401150","DOIUrl":"https://doi.org/10.1109/ICPADM.2018.8401150","url":null,"abstract":"Due to the global warming potential of SF6 and the rising number of ecological and economic considerations, it is becoming increasingly important to develop gas insulated systems which use an environmentally-acceptable gas. The partial discharge (PD) measurement plays an important role in testing, assessing and monitoring of all gas insulated components. Due to the different behavior of some defects related to DC voltage, the measurement procedures and acceptance criteria for AC voltage cannot be fully adapted for DC voltage. In this paper, the behavior of three typical defects at GIS and GIL (protrusion, floating electrode and free metallic particle) at four different gases (N2, CO2, dry air and SF6) and for different gas pressures are described, and the differences in PD activity at AC and DC voltage are shown. The PD inception voltages of the various measurements are compared, and typical PD patterns at AC and DC voltage are described. In this context, the innovative NoDi∗ pattern for visualization and physical interpretation of the measured pulse sequences at DC voltage is presented.","PeriodicalId":268745,"journal":{"name":"2018 12th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126239627","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: 4