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DGA: A novel strategy for key gases identification in power transformers DGA:一种新的电力变压器关键气体识别策略
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158662
M. Meira, Ignacio Carlucho, R. Álvarez, Leonardo J. Catalano, G. Acosta
{"title":"DGA: A novel strategy for key gases identification in power transformers","authors":"M. Meira, Ignacio Carlucho, R. Álvarez, Leonardo J. Catalano, G. Acosta","doi":"10.1109/eic47619.2020.9158662","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158662","url":null,"abstract":"There are several proposals for the dissolved gas analysis (DGA) of power transformers through the use of artificial intelligence. All these proposals, based on fuzzy logic, knowledge-based systems and neural networks, among others, are oriented to the diagnosis of the equipment based on the expert knowledge obtained over the years. This paper proposes a new approach in the use of neural networks, not for transformer diagnosis, but rather for the identification of key gases in mineral oil-immersed transformers. The proposal is tested on the dielectric oil of mineral origin traditionally used in transformers since its expected behavior is known. The key gases identified with this proposal coincide with those found in the literature, so the strategy is efficient. However, the potential of the work relies on the application to natural esters, field still under investigation.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124940278","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
Research on Failure Identification of Partial Discharge Ultrasonic Signal Based on GFCC 基于GFCC的局部放电超声信号故障识别研究
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/EIC47619.2020.9158683
Zhou Mengxi, Tang Zhiguo
{"title":"Research on Failure Identification of Partial Discharge Ultrasonic Signal Based on GFCC","authors":"Zhou Mengxi, Tang Zhiguo","doi":"10.1109/EIC47619.2020.9158683","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158683","url":null,"abstract":"Traditional on-line detection of partial discharge based on ultrasonic method has become an important means to detect the insulation condition of electrical equipment. However, most of its detection is based on the threshold value to realize the function similar to “traffic light”, that is, to detect whether partial discharge occurs or not. Gammatone frequency cepstral coefficient (GFCC) is based on human cochlear model and are widely used in voiceprint identification. This paper proposed an extraction algorithm of the characteristic parameter GFCC, and the PD ultrasonic signals of particle discharge and floating discharge are taken as examples, the GFCC of ultrasonic signals of those discharges are extracted. A preliminary partial discharge ultrasonic identification method based on GFCC is proposed. The method can realize on-line intelligent nonintrusive detection of the insulation state of high-voltage equipment, and break the limitation of traditional detection and diagnosis relying on certain threshold or human ear identification.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117025387","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 Use of Thermal and Load Data to Identify Large Autotransformers that Have Aged and Degraded Electrical Insulation 使用热和负载数据来识别老化和退化的电绝缘的大型自耦变压器
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/EIC47619.2020.9158731
Atip Doolgindachbaporn, G. Callender, J. Pilgrim, P. Lewin, G. Wilson
{"title":"The Use of Thermal and Load Data to Identify Large Autotransformers that Have Aged and Degraded Electrical Insulation","authors":"Atip Doolgindachbaporn, G. Callender, J. Pilgrim, P. Lewin, G. Wilson","doi":"10.1109/EIC47619.2020.9158731","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158731","url":null,"abstract":"This paper reports on the use of thermal and load data to identify large autotransformers that have aged and degraded electrical insulation. The top oil temperature rise and the oil time constant at rated load are used to guarantee that the transformer temperature will not exceed the thermal limits at the rated capacity. The thermal parameters from a heat run test are typically supposed to be unchanged over the lifetime of the transformer. Nevertheless, the thermal behaviors could be affected by the degradation of electrical insulation. Those parameters are recalculated by fitting operational measurements, which comprised of load profiles, winding temperature indicator (WTI) measurements and ambient temperature, to the IEC 60076–7 model. Significant increases in the thermal parameters indicate that there is a possibility that the autotransformer has aged and degraded electrical insulation.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130693948","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 of Internal Pyrolysis Characteristics of Crosslinked Polyethylene Cable 交联聚乙烯电缆内部热解特性分析
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158707
Liujie Wan, Guoqiang Zhang, Yikun Zhao, Mingyue Zhao, Zhenghai Liao
{"title":"Analysis of Internal Pyrolysis Characteristics of Crosslinked Polyethylene Cable","authors":"Liujie Wan, Guoqiang Zhang, Yikun Zhao, Mingyue Zhao, Zhenghai Liao","doi":"10.1109/eic47619.2020.9158707","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158707","url":null,"abstract":"Cable faults usually cause the core temperature to rise, and the insulation material will be pyrolyzed to produce gas. In this paper, a series of simulation experiments of overheating fault in XLPE cable are carried out, and the effects of temperature and time on the decomposition characteristics of insulating materials are analyzed. It was found that under internal overheating conditions, XLPE cables would pyrolyze to produce more than ten kinds of gases, such as C<inf>2</inf>H<inf>4</inf>, 2-C<inf>4</inf>H<inf>8</inf>, C<inf>2</inf>H<inf>6</inf>, C<inf>3</inf>H<inf>6</inf>, <tex>$C$</tex><inf>3</inf>H<inf>8</inf>, CH<inf>3</inf>Cl and C<inf>2</inf>H<inf>8</inf>Cl. Combining the application scenario and the chemical properties of decomposed gases, C<inf>2</inf>H<inf>4</inf> and 2-C<inf>4</inf>H<inf>8</inf> are proposed as characteristic gases to identify the early overheating faults in XLPE cables. This paper presents the feasibility of applying decomposition gas method to on-line monitoring of XLPE cable faults.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822194","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
Propagation Mechanism of Carbonized Trees in Oil-cellulose Insulation Systems of Power Transformers 碳化树在电力变压器油-纤维素绝缘系统中的繁殖机理
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158691
Yangchun Cheng, Shuang Zhang, T. Mao, Shaowei Guo, Z. Niu, Zhen Hao
{"title":"Propagation Mechanism of Carbonized Trees in Oil-cellulose Insulation Systems of Power Transformers","authors":"Yangchun Cheng, Shuang Zhang, T. Mao, Shaowei Guo, Z. Niu, Zhen Hao","doi":"10.1109/eic47619.2020.9158691","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158691","url":null,"abstract":"Oil-cellulose insulation systems are widely used in power transformers. Partial discharge (PD) is considered to play an important role in the deterioration process of the oil-cellulose insulation system. There has been little research in the past on the process and mechanism of PD destroying the oil-impregnated paper and pressboard. Through two sets of high voltage experiments on oil-impregnated pressboards, the phenomena about carbonized tracks, and trees were observed and analysed to understand the formation and development mechanism of the carbonized trees inside the pressboards. Furthermore, this analysis was also performed to reveal the mechanism and the process of PDs destroying the pressboards. From the results, we found that PDs occur in the gas channels. The inner wall of the channels is carbonized by the PDs, such that the carbonized tracks and trees propagate along the gas channels. The propagation of the carbonized tree is the process of the thickening and elongating of the tree branches. In addition, in the later stages of the thickening, the energy for carbonization comes from the leakage current and the chemical energy from the combustion of paper.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127929860","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
Narrow Band Dielectric Frequency Response: Theory and Applications 窄带介电频率响应:理论与应用
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158675
Charles N. Nybeck, Volney Naranjo
{"title":"Narrow Band Dielectric Frequency Response: Theory and Applications","authors":"Charles N. Nybeck, Volney Naranjo","doi":"10.1109/eic47619.2020.9158675","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158675","url":null,"abstract":"It is imperative that transformers in distribution and transmission substations function properly in order to avoid any damage or unnecessary system outages. There are diagnostic tests recommended in various international standards that can provide early evidence of possible issues within the equipment's overall health. The primary goal is to provide continuous and reliable operation throughout the life expectancy of a transformer, which relies mainly on the condition of the insulation system. Traditional power factor testing is performed at line frequency and is used to assess the condition of an insulation system. However, power factor measurements conducted at line frequency have limitations such as low sensitivity, lack of data, and incorrect temperature correction that can lead to a delayed response to an issue in the insulation system. It is suggested that the test be performed utilizing a narrow frequency band from 1 to 500 Hz. Performing the test using this frequency band offers higher sensitivity, specifically at 1 Hz. This strengthens the ability to trend results and to identify issues in a deteriorating insulation system at an earlier stage. This paper will discuss the theory behind power factor and narrow band dielectric frequency response, as well as discuss recommended applications and include a section for results analysis.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131917663","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
Onsite Testing and Diagnosis of Medium Voltage Resin Impregnated Paper (RIP) Insulated Buses by Using Very Low Frequency High Voltage 中压树脂浸渍纸(RIP)绝缘母线的甚低频高压现场测试与诊断
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158763
W. Hong, L. Cao, M. Arshad
{"title":"Onsite Testing and Diagnosis of Medium Voltage Resin Impregnated Paper (RIP) Insulated Buses by Using Very Low Frequency High Voltage","authors":"W. Hong, L. Cao, M. Arshad","doi":"10.1109/eic47619.2020.9158763","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158763","url":null,"abstract":"After RIP buses have been used and installed in generation and substation systems, reliability and safety are becoming critical with respect to a higher demand. Onsite testing and diagnosis of RIP buses play an important role to determine the insulation integrity and installation quality of new equipment and assess the condition for a long term reliable service. This paper will present onsite testing and diagnostic methods for RIP buses based on the review of current standards and available testing equipment, such as high voltage withstand test, partial discharge measurement, RF-probe and ultra-probe scanning, dissipation factor and capacitance measurements, etc. The onsite testing results will be discussed for the diagnosis and determination of non-conformance or defect during site installation. Recommendation will be provided for the future maintenance and condition assessment.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"20 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114034834","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
Not So Bright Ideas 不太好的主意
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158710
W. McDermid
{"title":"Not So Bright Ideas","authors":"W. McDermid","doi":"10.1109/eic47619.2020.9158710","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158710","url":null,"abstract":"Over the years novel designs have been implemented which provide considerable cost savings over conventional designs. The paper provides examples associated with rotating machines, instrument transformers, bushings, surge arresters, and distribution class pin insulators. In all cases cited in-service failures have resulted.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122343022","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
Partial Discharges testing in MV switchboards: sensitivity evaluation of embedded sensors 中压配电板局部放电试验:嵌入式传感器的灵敏度评估
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158660
G. Montanari, L. Cirioni, G. Galvagno, S. Mastroeni
{"title":"Partial Discharges testing in MV switchboards: sensitivity evaluation of embedded sensors","authors":"G. Montanari, L. Cirioni, G. Galvagno, S. Mastroeni","doi":"10.1109/eic47619.2020.9158660","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158660","url":null,"abstract":"The performance of a new idea of sensor for detecting partial discharge in switchboards is developed in this paper. A capacitive divider embedded in switchboard bushing is tested using two types of voltage impulse sources, that is, a calibrator and an object generating internal partial discharges (the latter is chosen based on the consideration that partial discharges from internal cavities are the most harmful phenomenon affecting insulation life). It is shown that the sensor embedded in a switchboard bushing has very good sensitivity to defects located inside the switchboard and also at the switchboard cable terminal, and much less sensitivity, compared to a HFCT, to disturbances coming from the electrical circuit connected to the switchboard. This would favor both partial discharge identification and their location, enabling effective diagnosis and alerting.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127414166","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
Thermal aging analysis of mineral oil and natural ester immersed windings 矿物油和天然酯浸没绕组的热老化分析
2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/EIC47619.2020.9158714
M. Meira, R. Álvarez, C. Verucchi, Leonardo J. Catalano, C. Ruschetti
{"title":"Thermal aging analysis of mineral oil and natural ester immersed windings","authors":"M. Meira, R. Álvarez, C. Verucchi, Leonardo J. Catalano, C. Ruschetti","doi":"10.1109/EIC47619.2020.9158714","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158714","url":null,"abstract":"Dielectric oil is part of the power transformer insulation system. There it performs its dual functions of providing cooling and insulation within the transformer. In recent years there has been a resurgence in the use of natural esters (vegetable oils), driven by environmental concerns. In this sense, their biodegradable characteristics and high flash point compared to mineral oils increase their use. However, their limited knowledge of long-term performance in service compared to mineral oil limits their application in power transformers. For these reasons, it is necessary to compare mineral oils and natural esters under different stresses. This work presents a comparison of the performance and behavior of an insulation system impregnated with mineral oil with another impregnated with natural ester under identical thermal stress. Physicochemical parameters, degree of polymerization, dielectric frequency response and gas generation are evaluated and analyzed. As a variant in the models to be analyzed, windings with different geometries were used. It was concluded that the paper impregnated with natural ester has practically not changed its moisture content with the aging time. Paper in cells with natural ester has aged somewhat less, although at low load temperatures the aging may be similar. It has been shown that the temperature reached in the windings is dependent in part on the geometry.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127876777","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
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