Pub Date : 2024-08-22DOI: 10.1109/TDEI.2024.3448396
Jiangbo Qian;Zhilin Zhang;Cheng Peng;Liwei Shao;Gengda Li
The dielectric characteristics of aqueous insulating oil has an important impact on the safe operation of transformers. In this article, the integration method is used to modify the Maxwell-Wanger nonuniform dielectric model to make it suitable for aqueous insulating oil, and the reliability of the new model is verified. The experimental results show that when the water content is 20 ppm, the maximum error of the real part of the complex dielectric constant of the insulating oil does not exceed 0.0541%, and the maximum error of the imaginary part does not exceed 1.076%. Finally, based on this model, the dielectric spectrum of the aqueous insulating oil is obtained, the variation law of the real part and the imaginary part of the aqueous insulating oil under different conditions is revealed, and the internal reasons for the dielectric properties of the aqueous insulating oil with temperature, frequency, and moisture content are analyzed, which provides an important reference data for evaluation and online monitoring of insulation performance of the aqueous insulating oil.
{"title":"Dielectric Spectroscopy of Aqueous Insulating Oil Based on Maxwell-Wagner Modified Model","authors":"Jiangbo Qian;Zhilin Zhang;Cheng Peng;Liwei Shao;Gengda Li","doi":"10.1109/TDEI.2024.3448396","DOIUrl":"10.1109/TDEI.2024.3448396","url":null,"abstract":"The dielectric characteristics of aqueous insulating oil has an important impact on the safe operation of transformers. In this article, the integration method is used to modify the Maxwell-Wanger nonuniform dielectric model to make it suitable for aqueous insulating oil, and the reliability of the new model is verified. The experimental results show that when the water content is 20 ppm, the maximum error of the real part of the complex dielectric constant of the insulating oil does not exceed 0.0541%, and the maximum error of the imaginary part does not exceed 1.076%. Finally, based on this model, the dielectric spectrum of the aqueous insulating oil is obtained, the variation law of the real part and the imaginary part of the aqueous insulating oil under different conditions is revealed, and the internal reasons for the dielectric properties of the aqueous insulating oil with temperature, frequency, and moisture content are analyzed, which provides an important reference data for evaluation and online monitoring of insulation performance of the aqueous insulating oil.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-21DOI: 10.1109/tdei.2024.3445333
Dan Cao, Zepeng Lv, Yunpeng Zhan, Shuai Hou, Yanqun Liao, Anying Cao, Kai Wu, Yonghong Cheng
{"title":"Space Charge and Conduction Characters of PP/POE Composites and Their Influence on the Aging Lifetime under DC Voltage2","authors":"Dan Cao, Zepeng Lv, Yunpeng Zhan, Shuai Hou, Yanqun Liao, Anying Cao, Kai Wu, Yonghong Cheng","doi":"10.1109/tdei.2024.3445333","DOIUrl":"https://doi.org/10.1109/tdei.2024.3445333","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Electric fields in cable insulations can be assessed via space charge measurements, but the field distributions estimated are sometimes unstable. In this work, the pulsed electroacoustic (PEA) method was applied to a 275-kV-class extruded cable. The 216 waveforms were obtained under an applied dc voltage of 320 kV without any space charge accumulations, and their field distributions were compared with the Laplace field. Their uncertainty for estimating electric field distribution was ±5.8% with the 95% confidence interval. Similar statistical analyses were conducted again for waveforms measured under various dc voltages. The uncertainty of the field distribution improved, as the applied voltage and SNR increased. If the testing voltage is sufficiently high or if a voltage is applied for a sufficiently long period of time to cause space charge accumulation, a safe side uncertainty is adopted. That is, by using the reference data, the widest error range and safer uncertainty evaluation can be achieved.
{"title":"Uncertainty of Electric Field Estimation in a Full-Sized Cable Based on Space Charge Measurement","authors":"Norikazu Fuse;Shosuke Morita;Satoru Miyazaki;Toshihiro Takahashi;Naohiro Hozumi","doi":"10.1109/TDEI.2024.3446742","DOIUrl":"https://doi.org/10.1109/TDEI.2024.3446742","url":null,"abstract":"Electric fields in cable insulations can be assessed via space charge measurements, but the field distributions estimated are sometimes unstable. In this work, the pulsed electroacoustic (PEA) method was applied to a 275-kV-class extruded cable. The 216 waveforms were obtained under an applied dc voltage of 320 kV without any space charge accumulations, and their field distributions were compared with the Laplace field. Their uncertainty for estimating electric field distribution was ±5.8% with the 95% confidence interval. Similar statistical analyses were conducted again for waveforms measured under various dc voltages. The uncertainty of the field distribution improved, as the applied voltage and SNR increased. If the testing voltage is sufficiently high or if a voltage is applied for a sufficiently long period of time to cause space charge accumulation, a safe side uncertainty is adopted. That is, by using the reference data, the widest error range and safer uncertainty evaluation can be achieved.","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142408763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-20DOI: 10.1109/tdei.2024.3446745
Yunfei Jia, Xun Luo, Shengchang Ji, Wanjing Gao, Shuangrui Jia, Simeng Li, Fan Zhang
{"title":"The Influence of Electrode Structure on the Discharge Characteristics of Power-Frequency Arc in Insulating Oil","authors":"Yunfei Jia, Xun Luo, Shengchang Ji, Wanjing Gao, Shuangrui Jia, Simeng Li, Fan Zhang","doi":"10.1109/tdei.2024.3446745","DOIUrl":"https://doi.org/10.1109/tdei.2024.3446745","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-19DOI: 10.1109/tdei.2024.3445872
Mihir Bhatt, Praghnesh Bhatt
{"title":"Investigating the Magnetic Field Dominated Streamer Dynamics in Transformer Oil","authors":"Mihir Bhatt, Praghnesh Bhatt","doi":"10.1109/tdei.2024.3445872","DOIUrl":"https://doi.org/10.1109/tdei.2024.3445872","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-19DOI: 10.1109/tdei.2024.3445873
Yaqi Zhang, Ziqiang Cai, Yongxia Han, Gang Liu, Lu Qu, Licheng Li
{"title":"Correlation Analysis between Discharge Image Characteristics and Current of the Rod-plate Gap under Lightning Impulse","authors":"Yaqi Zhang, Ziqiang Cai, Yongxia Han, Gang Liu, Lu Qu, Licheng Li","doi":"10.1109/tdei.2024.3445873","DOIUrl":"https://doi.org/10.1109/tdei.2024.3445873","url":null,"abstract":"","PeriodicalId":13247,"journal":{"name":"IEEE Transactions on Dielectrics and Electrical Insulation","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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