2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第3页

Electrical tree growth under harmonic frequencies characterized by partial discharges waveforms 以局部放电波形为特征的谐波频率下的电树生长

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437511

R. Schurch, Osvaldo Muñoz, J. Ardila-Rey

引用次数: 2

Effect of magnetic properties of liquid dielectric on the leakage flux of power transformer 液体介质的磁性对电力变压器漏磁的影响

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437533

S. Rohith, Niharika Baruah, M. Chakraborthy, S. K. Nayak

{"title":"Effect of magnetic properties of liquid dielectric on the leakage flux of power transformer","authors":"S. Rohith, Niharika Baruah, M. Chakraborthy, S. K. Nayak","doi":"10.1109/CEIDP49254.2020.9437533","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437533","url":null,"abstract":"The magnetic flux in the transformer establishes the magnetic link between the low voltage and high voltage windings. The magnetic flux chooses the path of lowest reluctance. In general, the transformers are designed such that most of the flux flows through the core. The magnetic flux will experience low reluctance if the medium through which it is flowing is ferromagnetic. The core in transformer is made up of cold rolled grain oriented (CRGO), a ferro-magnetic material to reduce the reluctance to the magnetic flux linkage, to maintain high flux density, to maximize magnetic induction, to minimize specific core loss at no load, and low magnetostriction. Leakage flux is responsible for the voltage dip on the secondary side, hence its reduction is important to maintain good voltage regulation and efficiency. The leakage flux also flows through the liquid dielectric used for insulation and cooling purposes in transformer. The magnetic nature of liquid dielectric is very much important to analyze its impact on leakage flux. For this purpose, two variants of liquid dielectrics, mineral oil (MO), and vegetable oil (VO) are studied for their magnetic nature using vibrating sample magnetometer. The liquid insulation magnetization is plotted with respect to magnetic field strength. The diamagnetic materials repel the magnetic field lines. The VO is found to be more diamagnetic in nature than the MO from the analysis. The influence of the diamagnetic nature of liquid dielectric on the leakage flux, and the advantage of VO over MO in terms of magnetic nature is discussed in this paper and corroborated.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114861033","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

Data Driven Analysis of Aged Insulating Oils by UV-Vis Spectroscopy and Principal Component Analysis (PCA) 老化绝缘油的紫外可见光谱与主成分分析

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437375

Niharika Baruah, Rohith Sangineni, Manas Chakraborty, S. K. Nayak

{"title":"Data Driven Analysis of Aged Insulating Oils by UV-Vis Spectroscopy and Principal Component Analysis (PCA)","authors":"Niharika Baruah, Rohith Sangineni, Manas Chakraborty, S. K. Nayak","doi":"10.1109/CEIDP49254.2020.9437375","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437375","url":null,"abstract":"The ageing of the insulating oil in a power transformer is a major concern for the power utilities. The effective monitoring of the insulation medium is very critical to prevent failures in the power system network. In this work, a natural ester based oil (NEO) is considered for the study of its ageing characteristics using ultraviolet visible (UV-Vis) spectroscopy analysis combined with principal component analysis (PCA) technique. The NEO considered gives an added advantage of being a biodegradable substitute to the conventional mineral oil (MO). The oil is subjected to accelerated thermal stress in a sealed vessel ageing test setup at 150°C for up to 2000 hours. The samples are taken out at intervals of 500 hours for carrying out the required tests. The UV-Vis spectroscopy is performed for both fresh and aged oil samples to observe the variation in the absorbance spectrum in all the intervals over a wide wavelength range of 350 nm to 800 nm. PCA is a statistical technique which is employed to conduct the data driven analysis of the oil samples. This multivariate method is an important tool for dimensionality reduction and helps in understanding which variables are more relevant in ageing assessment by various plots related to PCA. The findings showed that the UV-Vis analysis combined with PCA helps in evaluating the ageing of a sample by classifying and analyzing the data.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114912005","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

Piezoelectric nanofibers for multifunctional composite materials 多功能复合材料中的压电纳米纤维

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437547

D. Fabiani, G. Selleri, F. Grolli, M. Speranza

引用次数: 1

Surface discharge behaviors of high temperature insulation subjected to gas pressure variations in hybrid propulsion systems 混合动力推进系统中气体压力变化下的高温绝缘表面放电行为

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437554

Chuanyang Li, Tohid Shahsavarian, Mohamadreza Arab Baferani, J. Ronzello, Yang Cao

引用次数: 0

New end life criteria for mineral insulating oils 矿物绝缘油的新终寿命标准

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437543

P. Fernandes, H. Wilhelm, K. Moscon, C. Steffens, M. Ziliotto, N. D. Barth

引用次数: 0

Study on Precipitate Aggregation Mechanism in Prefabricated Termination for XLPE Cable 交联聚乙烯电缆预制端部沉淀聚集机理研究

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437500

Takafumi Mashimo, Primadika Wiweko Banyuaji, Toshihiro Takahashi

{"title":"Study on Precipitate Aggregation Mechanism in Prefabricated Termination for XLPE Cable","authors":"Takafumi Mashimo, Primadika Wiweko Banyuaji, Toshihiro Takahashi","doi":"10.1109/CEIDP49254.2020.9437500","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437500","url":null,"abstract":"A stress relief cone (SRC) plays an essential role in the prefabricated termination of an XLPE cable system to sustain the electrical insulation capability at the cable's end section. Precipitate is generated on a certain part of the SRC surface due to long-term operation, which could lead to a dielectric breakdown; however, its generation process has not yet been clearly elucidated. This study focuses on dielectrophoresis to clarify the formation process of precipitate. First, a model electrode simulating the SRC shape is created, and the state of precipitate aggregation using a precipitate-simulating ferroelectric substance is reproduced. Next, a numerical calculation model of dielectrophoresis is used to derive the density distribution of the precipitate over time. As a result, the precipitate aggregation state could be reproduced, which is similar to a dismantled SRC after a long-term operation. For these reasons, the authors conclude that the precipitate could be the aggregate of fine particles precipitated from the rubber material of the SRC by dielectrophoresis.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124886636","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

Influence of Water Contents on Ester Liquids Partial Discharge Inception Voltage 水含量对酯类液体局部放电起始电压的影响

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437441

L. Calcara, A. Sbravati, K. Rapp, M. Pompili

引用次数: 2

Investigation on new sensors for a contactless impulse voltage measurement 新型非接触冲击电压测量传感器的研究

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437382

M. Kuhnke, P. Werle, T. Schlüterbusch, J. Meisner

{"title":"Investigation on new sensors for a contactless impulse voltage measurement","authors":"M. Kuhnke, P. Werle, T. Schlüterbusch, J. Meisner","doi":"10.1109/CEIDP49254.2020.9437382","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437382","url":null,"abstract":"Dividers used for the impulse measurement are usually large and expensive equipment. They also add capacitive load, which reduces the impulse generators efficiency. Because of the high field strength, the impulse can also be recorded with a field sensor and an oscilloscope. The impulse measurement with a field sensor could be an alternative or at least an addition to standard dividers. Especially, since battery operated oscilloscopes with wireless communication allow a field sensor to be placed virtually anywhere in the test facility. The RedPitaya (RP) is an affordable experimental board with two DACs with 125 Msamples/s and 14 bit resolution. It can be battery operated and remote controlled via WLAN. The RP is used with different field sensors to record lighting and switching impulses. These are compared to the measurements with a voltage divider and transient recorder. The tests are performed at the Schering-Institute of the University of Hannover and at the National Metrology Institute of Germany Physikalisch-Technische Bundesanstalt (PTB). It is shown, that field probes can be used to accurately measure the peak voltage, but the wave shape, especially the time to half-value, depends on the field sensor performance. This can be corrected with digital signal processing. If calibrated correctly, field sensors can be a valuable addition to impulse voltage test systems.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129362504","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

Processing influences of resin-based insulation materials for wireless power transfer applications 树脂基绝缘材料对无线电力传输应用的加工影响

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437503

M. Kneidl, M. Masuch, D. Rieger, A. Kühl, J. Franke

{"title":"Processing influences of resin-based insulation materials for wireless power transfer applications","authors":"M. Kneidl, M. Masuch, D. Rieger, A. Kühl, J. Franke","doi":"10.1109/CEIDP49254.2020.9437503","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437503","url":null,"abstract":"Due to the electrification of the whole mobility sector, the demand for new insulation materials and processes is constantly increasing. Beside the electric traction drives, new technologies such as inductive charging are becoming more and more important in electric vehicles. Especially for wireless power transfer, high-frequency litz wires are used to generate the required electromagnetic field. While semi-finished products and insulation systems are continuously developing, insulation processes like potting remain unchanged. The consequence is an inappropriate insulation of the coil structure resulting in increasing eddy current losses or breakdowns of the inductance. Additionally, high mechanical and thermal loads, occurring in a typical operation environment for electric vehicles, result in accelerated aging of the insulation material. This increases the challenges in the design and manufacturing of insulation systems for inductive power transfer devices. The aim of this work is to identify and evaluate all relevant process parameters for potting high-frequency litz wires with varying primary insulation systems. To ensure the required mechanical and electrical properties, a high degree of impregnation of the litz wires is targeted.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127251518","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