Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481114
Hugh Zhu
Vibration sparking can cause serious erosion and deterioration of the stator bar insulation. A circuit model of the semi-conductive layer of a stator bar is proposed to describe the parameters of VS generation and the distribution of the parasitic current along the semi-conductive layer. A simulated VS system was set up to generate VS activity. This paper investigated the development process of and deterioration levels of VS erosion on the bar surface with aging time and the factors influencing VS erosion. The results show that there were three stages in the VS development process with different sparking intensities at each stage. The resistivity of the semi-conductive layer greatly increased after VS erosion. It was found that high energy from VS can result in decomposition of the semi-conductive material and lead to damage of the groundwall insulation.
{"title":"Development Process of Vibration Sparking Erosion on Stator Bars","authors":"Hugh Zhu","doi":"10.1109/EIC.2018.8481114","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481114","url":null,"abstract":"Vibration sparking can cause serious erosion and deterioration of the stator bar insulation. A circuit model of the semi-conductive layer of a stator bar is proposed to describe the parameters of VS generation and the distribution of the parasitic current along the semi-conductive layer. A simulated VS system was set up to generate VS activity. This paper investigated the development process of and deterioration levels of VS erosion on the bar surface with aging time and the factors influencing VS erosion. The results show that there were three stages in the VS development process with different sparking intensities at each stage. The resistivity of the semi-conductive layer greatly increased after VS erosion. It was found that high energy from VS can result in decomposition of the semi-conductive material and lead to damage of the groundwall insulation.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115215138","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481090
A. Jahromi, Mohsen Hosseinkhanloo, Laurent Lamare
Under load tap changers (ULTC) have the most share of defects in transformers causing enormous expenses to utilities. ULTCs have been a weak part of any transformer as they deteriorate over time due to mechanical problems or contact wear from repeated operations. Erosion of the contacts over time is expected due to the nature of their function. Coking of the contacts causes overheating, which can cause thermal runaway. Diagnostics of ULTC is a key for any utility. The goal of diagnostics is to provide equipment owners with a ranking that prioritizes maintenance activities. This goes beyond the simple good/bad distinction, to provide some grading to permit different management options. Historically, DGAs in ULTCs have been considered rather insignificant due to the large amount of gases normally generated by the arcs. This has however been reconsidered the recent years and the opinion today is that quite a lot of information is gained by DGAs of ULTC oils. Dissolved gas analysis (DGA) has been proven to provide relevant information about transformer and tap changer health or faults. On the other hand, winding DC resistance measurement can be a complementary method for identification of defective connections triggered by DGA detected fault. In this paper, the DGA analysis is employed to analyze the gases generated in the transformer tank by a possible fault at selector switch tap. Diagnostics performed using both DGA and DC winding resistance tests for a 30MVA 63/20kV three-phase transformer with an in-tank ULTC. The results showed that combination of DGA and DC winding resistance is a simple and effective diagnostic technique to detect coking and carbonized contacts of the ULTC tap selector contacts. Trending of transformer tank DGA data and DC winding resistance proved to be reliable to trigger internal inspection, overhaul and repair of ULTC tap selector.
{"title":"Under Load Tap Changer Diagnostics Based on Transformer DGA and DC Resistance Tests","authors":"A. Jahromi, Mohsen Hosseinkhanloo, Laurent Lamare","doi":"10.1109/EIC.2018.8481090","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481090","url":null,"abstract":"Under load tap changers (ULTC) have the most share of defects in transformers causing enormous expenses to utilities. ULTCs have been a weak part of any transformer as they deteriorate over time due to mechanical problems or contact wear from repeated operations. Erosion of the contacts over time is expected due to the nature of their function. Coking of the contacts causes overheating, which can cause thermal runaway. Diagnostics of ULTC is a key for any utility. The goal of diagnostics is to provide equipment owners with a ranking that prioritizes maintenance activities. This goes beyond the simple good/bad distinction, to provide some grading to permit different management options. Historically, DGAs in ULTCs have been considered rather insignificant due to the large amount of gases normally generated by the arcs. This has however been reconsidered the recent years and the opinion today is that quite a lot of information is gained by DGAs of ULTC oils. Dissolved gas analysis (DGA) has been proven to provide relevant information about transformer and tap changer health or faults. On the other hand, winding DC resistance measurement can be a complementary method for identification of defective connections triggered by DGA detected fault. In this paper, the DGA analysis is employed to analyze the gases generated in the transformer tank by a possible fault at selector switch tap. Diagnostics performed using both DGA and DC winding resistance tests for a 30MVA 63/20kV three-phase transformer with an in-tank ULTC. The results showed that combination of DGA and DC winding resistance is a simple and effective diagnostic technique to detect coking and carbonized contacts of the ULTC tap selector contacts. Trending of transformer tank DGA data and DC winding resistance proved to be reliable to trigger internal inspection, overhaul and repair of ULTC tap selector.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115617707","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8480887
A. Céspedes, D. García, B. García
Power transformers comprise one of the most important assets in the power systems. Damage in a power transformer can lead to a collapse in the electrical transmission network, disturbing a big number of users. The cellulosic insulation plays a key role in the life of power transformer. Several studies have demonstrated that high levels of moisture in the cellulosic insulation increase its rate of ageing limiting the power transformer's life expectancy. In this work, the experimental validation of a sensor aimed at determining the moisture content of cellulosic insulation is presented. The working principle of the sensor is based in the use of the Frequency Dielectric Spectroscopy method (FDS) to relate the main dielectric characteristics of the sensor and those of the transformer solid insulation. The validation presented in this work considers different temperatures and moisture contents under equilibrium and non-equilibrium conditions. Additionally, the experimental dielectric curves of the sensor are compared with simulation data obtained by means of a finite-element model that reproduces the applied experimental conditions, to validate the modeling process.
{"title":"Experimental validation of a moisture sensor for cellulosic insulation of power transformers","authors":"A. Céspedes, D. García, B. García","doi":"10.1109/EIC.2018.8480887","DOIUrl":"https://doi.org/10.1109/EIC.2018.8480887","url":null,"abstract":"Power transformers comprise one of the most important assets in the power systems. Damage in a power transformer can lead to a collapse in the electrical transmission network, disturbing a big number of users. The cellulosic insulation plays a key role in the life of power transformer. Several studies have demonstrated that high levels of moisture in the cellulosic insulation increase its rate of ageing limiting the power transformer's life expectancy. In this work, the experimental validation of a sensor aimed at determining the moisture content of cellulosic insulation is presented. The working principle of the sensor is based in the use of the Frequency Dielectric Spectroscopy method (FDS) to relate the main dielectric characteristics of the sensor and those of the transformer solid insulation. The validation presented in this work considers different temperatures and moisture contents under equilibrium and non-equilibrium conditions. Additionally, the experimental dielectric curves of the sensor are compared with simulation data obtained by means of a finite-element model that reproduces the applied experimental conditions, to validate the modeling process.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115172171","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481040
C. Staubach, T. Hildinger
In this paper different kinds of electrical driven failure modes in the end-winding region, are discussed and classified. Failure types related to the stress grading system are analyzed via numerical simulation models and root causes are given for the different defects based on the calculation results. Typical pictures of various findings are presented and explained. In a last step possible diagnostic measurements to identify issues related to the stress grading are discussed and some PD-pattern are presented exemplarily. The aim of this work is to give the basis to correlate findings in the end-winding and especially the highly stressed stress grading area with their most likely cause of defect.
{"title":"Failure Mode Assessment of the Generator Stress Grading System","authors":"C. Staubach, T. Hildinger","doi":"10.1109/EIC.2018.8481040","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481040","url":null,"abstract":"In this paper different kinds of electrical driven failure modes in the end-winding region, are discussed and classified. Failure types related to the stress grading system are analyzed via numerical simulation models and root causes are given for the different defects based on the calculation results. Typical pictures of various findings are presented and explained. In a last step possible diagnostic measurements to identify issues related to the stress grading are discussed and some PD-pattern are presented exemplarily. The aim of this work is to give the basis to correlate findings in the end-winding and especially the highly stressed stress grading area with their most likely cause of defect.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116392149","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481110
T. Umemoto, Yasutomo Otake, M. Yoshimura, Takashi Nada, Ryoji Miyatake
SiC-based nonlinear resistive material has been used for end-turn stress grading (SG) of turbogenerators over decades. In order to reduce power dissipations and avoid thermal breakdown of the SG material, high-voltage class generators adopt multiple-layer SG system, at which two SG materials with different nonlinear resistivity are used. With increasing capacity and efficiency of the apparatus, electrical, and especially thermal stresses at the system may become problematic, hence higher reliable SG system is required. For suppressing the local heating effectively, an optimization method of the multiple-layer system was investigated, where a new combination of the two SG materials was proposed and length of the SG layer in the longitudinal direction along a coil was optimized by using analytical approximations of the power dissipation. The optimized SG system showed 20% lower power dissipation and also 15% higher flashover voltage than those of the conventional one. Consequently, the effectiveness of the optimization method proposed was successfully confirmed.
{"title":"Optimization of Multiple-Layer End-Turn Stress Grading System for High Voltage Turbogenerators","authors":"T. Umemoto, Yasutomo Otake, M. Yoshimura, Takashi Nada, Ryoji Miyatake","doi":"10.1109/EIC.2018.8481110","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481110","url":null,"abstract":"SiC-based nonlinear resistive material has been used for end-turn stress grading (SG) of turbogenerators over decades. In order to reduce power dissipations and avoid thermal breakdown of the SG material, high-voltage class generators adopt multiple-layer SG system, at which two SG materials with different nonlinear resistivity are used. With increasing capacity and efficiency of the apparatus, electrical, and especially thermal stresses at the system may become problematic, hence higher reliable SG system is required. For suppressing the local heating effectively, an optimization method of the multiple-layer system was investigated, where a new combination of the two SG materials was proposed and length of the SG layer in the longitudinal direction along a coil was optimized by using analytical approximations of the power dissipation. The optimized SG system showed 20% lower power dissipation and also 15% higher flashover voltage than those of the conventional one. Consequently, the effectiveness of the optimization method proposed was successfully confirmed.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125397720","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481085
Mona Ghessemi
Regarding the outstanding properties, commercial availability of starting material, and maturity of the technological processes, silicon carbide (SiC) and gallium nitride (GaN) with a relatively large bandgap of 3.3 eV and 3.4 eV, respectively are the more promising semiconductor materials known as wide bandgap (WBG) semiconductors. WBG semiconductors which are expected to have better efficiency, higher temperature tolerance, and higher voltage blocking capability than their silicon (Si) counterparts having a bandgap of 1.1 eV are changing the landscape of power electronics industry. Moreover, a new class of semiconductor materials so-called ultrawide-bandgap (UWBG) semiconductors with bandgaps higher than that of GaN including diamond (C), gallium oxide (Ga2O3), and aluminum nitride (AIN) currently investigated will be generation-after-next power electronics. However new packaging technologies are needed to realize the mentioned superior system performance with WBG and UWBG devices. Among various factors needed to be addressed for high-density packaging designs of high voltage WBG and UWBG devices, the high electric fields, especially at the edges of the substrate metallization, can lead to unacceptable levels of partial discharges in the silicone gel commonly used as encapsulations. In this paper, geometrical techniques for electric field control inside (U)WBG power electronics modules are studied by finite element method models (FEM) developed in COMSOL Multiphysics.
{"title":"Geometrical Techniques for Electric Field Control in (Ultra) Wide Bandgap Power Electronics Modules","authors":"Mona Ghessemi","doi":"10.1109/EIC.2018.8481085","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481085","url":null,"abstract":"Regarding the outstanding properties, commercial availability of starting material, and maturity of the technological processes, silicon carbide (SiC) and gallium nitride (GaN) with a relatively large bandgap of 3.3 eV and 3.4 eV, respectively are the more promising semiconductor materials known as wide bandgap (WBG) semiconductors. WBG semiconductors which are expected to have better efficiency, higher temperature tolerance, and higher voltage blocking capability than their silicon (Si) counterparts having a bandgap of 1.1 eV are changing the landscape of power electronics industry. Moreover, a new class of semiconductor materials so-called ultrawide-bandgap (UWBG) semiconductors with bandgaps higher than that of GaN including diamond (C), gallium oxide (Ga2O3), and aluminum nitride (AIN) currently investigated will be generation-after-next power electronics. However new packaging technologies are needed to realize the mentioned superior system performance with WBG and UWBG devices. Among various factors needed to be addressed for high-density packaging designs of high voltage WBG and UWBG devices, the high electric fields, especially at the edges of the substrate metallization, can lead to unacceptable levels of partial discharges in the silicone gel commonly used as encapsulations. In this paper, geometrical techniques for electric field control inside (U)WBG power electronics modules are studied by finite element method models (FEM) developed in COMSOL Multiphysics.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134132608","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481087
C. Hudon, N. Amyot, S. Bernier, É. David, M. Essalihi
Hydro-Quebec has started carrying out Polarization and Depolarization Current measurements (PDC) more than 20 years ago. A Direct Current Ramp Test (DCRT) apparatus has also been built in house in the early 2000's and since 2012 systematic measurements with both tests are prescribed to be done every 6 years on every one of our 350 generators. An extensive comparison of both types of electric tests has been done to determine the influence of factors such as temperature and humidity, type of ground wall insulation and the nature of the stress grading coating on the measured current. The DCRT and PDC test procedures are such that they are not always giving the same diagnosis and sometimes this can easily be explained, but in some case more in depth analysis is required. A comparison of the results of both types of tests was done and the main features and limits are presented herein.
{"title":"Comparison of DC Ramp and Polarization and Depolarisation Tests on Hydrogenerators","authors":"C. Hudon, N. Amyot, S. Bernier, É. David, M. Essalihi","doi":"10.1109/EIC.2018.8481087","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481087","url":null,"abstract":"Hydro-Quebec has started carrying out Polarization and Depolarization Current measurements (PDC) more than 20 years ago. A Direct Current Ramp Test (DCRT) apparatus has also been built in house in the early 2000's and since 2012 systematic measurements with both tests are prescribed to be done every 6 years on every one of our 350 generators. An extensive comparison of both types of electric tests has been done to determine the influence of factors such as temperature and humidity, type of ground wall insulation and the nature of the stress grading coating on the measured current. The DCRT and PDC test procedures are such that they are not always giving the same diagnosis and sometimes this can easily be explained, but in some case more in depth analysis is required. A comparison of the results of both types of tests was done and the main features and limits are presented herein.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124169007","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481122
Joe V. Williams
One of the more challenging, and often misunderstood, design decisions in the manufacture of resin rich high voltage coils is selecting the proper ground wall build for the coil. How many layers of tape need to be applied to the coil for a given ground wall thickness? The selection of this proper build is critical to producing a coil that, after pressing, will have the proper ground wall density, and the proper ratio of glass, epoxy and mica, to assure maximum coil performance in the field as well as during the coil validation. This paper will explain how the proper gram density of a ground wall is determined, challenge some of the conventional wisdom, suggest target densities and acceptable ranges, and give examples for various resin rich mica tapes and design requirements. We will also explain how the volume of resin to mica and glass changes with these target densities.
{"title":"Resin Rich High Voltage Coil Design Gram Density Optimization","authors":"Joe V. Williams","doi":"10.1109/EIC.2018.8481122","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481122","url":null,"abstract":"One of the more challenging, and often misunderstood, design decisions in the manufacture of resin rich high voltage coils is selecting the proper ground wall build for the coil. How many layers of tape need to be applied to the coil for a given ground wall thickness? The selection of this proper build is critical to producing a coil that, after pressing, will have the proper ground wall density, and the proper ratio of glass, epoxy and mica, to assure maximum coil performance in the field as well as during the coil validation. This paper will explain how the proper gram density of a ground wall is determined, challenge some of the conventional wisdom, suggest target densities and acceptable ranges, and give examples for various resin rich mica tapes and design requirements. We will also explain how the volume of resin to mica and glass changes with these target densities.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124951173","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481108
Su Zhao, Dongxian Tan, D. Xiao, Lili Zhu, Xiaoling Zhao, Ruishuang Zhong, Yizhou Wu
Sulfur hexafluoride (SF6) has been limited to use because its high global warming potential (GWP). Iodotrifluoromethane (CF3I) is a potential alternative to SF6, which has advantages on environmental performance. But due to its instability, it may decompose during discharge process. The decomposition products may affect the insulating characteristics of Cf3I/N2. In this paper the decomposition products are detected include C2F6, C2F4, C3F8 and their quantities after 50, 100, 150 and 200 times of discharge in non-uniform electric field and analyzed the breakdown voltages after different times discharge. The decompositions of Cf3I/N2 can change the components of insulating gas and have the solid decomposition iodine. But the amount of decomposition will not be very large and it will not have a significant impact on the insulation properties after limited and transient discharges.
{"title":"Experimental Study on the Decomposition Products of CF3I/N2Gas Mixtures","authors":"Su Zhao, Dongxian Tan, D. Xiao, Lili Zhu, Xiaoling Zhao, Ruishuang Zhong, Yizhou Wu","doi":"10.1109/EIC.2018.8481108","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481108","url":null,"abstract":"Sulfur hexafluoride (SF6) has been limited to use because its high global warming potential (GWP). Iodotrifluoromethane (CF3I) is a potential alternative to SF6, which has advantages on environmental performance. But due to its instability, it may decompose during discharge process. The decomposition products may affect the insulating characteristics of Cf<inf>3</inf>I/N<inf>2</inf>. In this paper the decomposition products are detected include C<inf>2</inf>F<inf>6</inf>, C<inf>2</inf>F<inf>4</inf>, C<inf>3</inf>F<inf>8</inf> and their quantities after 50, 100, 150 and 200 times of discharge in non-uniform electric field and analyzed the breakdown voltages after different times discharge. The decompositions of Cf<inf>3</inf>I/N<inf>2</inf> can change the components of insulating gas and have the solid decomposition iodine. But the amount of decomposition will not be very large and it will not have a significant impact on the insulation properties after limited and transient discharges.","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122671129","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}
Pub Date : 2018-06-01DOI: 10.1109/EIC.2018.8481136
Xuze Gao, M. Dong, M. Ren, K. Zhou, Wenguang Huang
The insulation of the power cable is the key factor to ensure the safety of the cable. Because it has good corrosion resistance, the crosslinked polyethylene (XLPE) cable is widely used in various situations of power transmission, however, in actual operation, the cable is subjected to some unfavorable factors such as soil pH, so the insulation performance of XLPE cable in different environments will be affected. Harsh environment, such as underwater power transmission, will accelerate the deterioration of cable insulation dielectric. In this paper, the onsite operation situation of the cable is simulated by setting different aging time and different pH value. The cable samples are accelerated aged by water needle method. The insulation deterioration degree of cable is measured by different detection methods, and the relationship between the deterioration degree of cable insulation and the environment is verified. The results show that the deterioration of cable insulation more serious in alkaline environment°
{"title":"Damage of Cable Insulation with Pinhole Defect Under the Acidic and Alkaline Environment","authors":"Xuze Gao, M. Dong, M. Ren, K. Zhou, Wenguang Huang","doi":"10.1109/EIC.2018.8481136","DOIUrl":"https://doi.org/10.1109/EIC.2018.8481136","url":null,"abstract":"The insulation of the power cable is the key factor to ensure the safety of the cable. Because it has good corrosion resistance, the crosslinked polyethylene (XLPE) cable is widely used in various situations of power transmission, however, in actual operation, the cable is subjected to some unfavorable factors such as soil pH, so the insulation performance of XLPE cable in different environments will be affected. Harsh environment, such as underwater power transmission, will accelerate the deterioration of cable insulation dielectric. In this paper, the onsite operation situation of the cable is simulated by setting different aging time and different pH value. The cable samples are accelerated aged by water needle method. The insulation deterioration degree of cable is measured by different detection methods, and the relationship between the deterioration degree of cable insulation and the environment is verified. The results show that the deterioration of cable insulation more serious in alkaline environment°","PeriodicalId":184139,"journal":{"name":"2018 IEEE Electrical Insulation Conference (EIC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116631229","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：