In the development of on-line monitoring technique for transformer aging status, detecting concentration of methanol dissolved in transformer oil by the method of surface enhanced Raman spectroscopy (SERS) is a novel and promising technique. By use of Raman spectroscopy technique, we can improve various shortcomings of traditional detection technology. In this paper, the concentration of methanol dissolved in 2 mL/L methanol-oil solution was effectively detected by surface enhanced Raman spectroscopy. In the first, Raman spectra of single methanol molecule and its SERS were simulated to analyze the Raman peaks of methanol. A SERS substrate was prepared with selective enhancement. Based on prepared SERS substrate, concentration of methanol dissolved in transformer oil with content of 2 mL/L have been effectively detected. This helped us to further study the lower concentration of methanol in oil and make quantitative analysis.
{"title":"A SERS Substrate For Detecting Methanol In Transformer Oil","authors":"Shuhua Zhang, Weigen Chen, Fu Wan, Haiyang Shi, Weiran Zhou, Jiayi Zhang, Chengzhi Zhu","doi":"10.1109/ICDL.2019.8796557","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796557","url":null,"abstract":"In the development of on-line monitoring technique for transformer aging status, detecting concentration of methanol dissolved in transformer oil by the method of surface enhanced Raman spectroscopy (SERS) is a novel and promising technique. By use of Raman spectroscopy technique, we can improve various shortcomings of traditional detection technology. In this paper, the concentration of methanol dissolved in 2 mL/L methanol-oil solution was effectively detected by surface enhanced Raman spectroscopy. In the first, Raman spectra of single methanol molecule and its SERS were simulated to analyze the Raman peaks of methanol. A SERS substrate was prepared with selective enhancement. Based on prepared SERS substrate, concentration of methanol dissolved in transformer oil with content of 2 mL/L have been effectively detected. This helped us to further study the lower concentration of methanol in oil and make quantitative analysis.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132273216","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796658
P. Totzauer, J. Kúdelčík, J. Hornak, P. Trnka
In this article we tackle the main problem of nanoparticles which is aglomeration, sedimentation and their long term stability. It has been proved that the nanoparticles offer various benefits for improving the electrical parameters (like breakdown voltage, dissipation factor tan $delta$, etc.) of insulating liquids. On the other hand the problematics of long term usability of this insulating nano-liquid is not much covered. Our base fluid was one of the natural esters oils - the rapeseed oil which is manufactured localy which can reduce the final price.The importance of nanoparticle surfactants is often misunderstood. Here we present comparison of several surfactant agents with recommendation for further use in combination with natural ester oil based on the chemical structure. The procedure of sample preparation is described in detail. The samples are subject to various measurements of electrical and physical properties with focus on long term usage of these fluids. The dissipation factor was measured in frequency range from 0.001 Hz to 10 kHz which offers the insight into the material behaviour.The analysis of particle size distribution was measured with cooperation with physics department of University of Zilina. The method used for this analysis was acoustic method that determine the PSD (particle size distribution) of the sample and also the attenuation dependence. From these results the FWHM (full width at half maximum) parameters were determined and the nanoparticle distribution was analysed.
{"title":"Analysis of Particle Size Distribution and Other Parameters of Nanoparticles in Natural Ester Oil","authors":"P. Totzauer, J. Kúdelčík, J. Hornak, P. Trnka","doi":"10.1109/ICDL.2019.8796658","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796658","url":null,"abstract":"In this article we tackle the main problem of nanoparticles which is aglomeration, sedimentation and their long term stability. It has been proved that the nanoparticles offer various benefits for improving the electrical parameters (like breakdown voltage, dissipation factor tan $delta$, etc.) of insulating liquids. On the other hand the problematics of long term usability of this insulating nano-liquid is not much covered. Our base fluid was one of the natural esters oils - the rapeseed oil which is manufactured localy which can reduce the final price.The importance of nanoparticle surfactants is often misunderstood. Here we present comparison of several surfactant agents with recommendation for further use in combination with natural ester oil based on the chemical structure. The procedure of sample preparation is described in detail. The samples are subject to various measurements of electrical and physical properties with focus on long term usage of these fluids. The dissipation factor was measured in frequency range from 0.001 Hz to 10 kHz which offers the insight into the material behaviour.The analysis of particle size distribution was measured with cooperation with physics department of University of Zilina. The method used for this analysis was acoustic method that determine the PSD (particle size distribution) of the sample and also the attenuation dependence. From these results the FWHM (full width at half maximum) parameters were determined and the nanoparticle distribution was analysed.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115763109","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796784
Runhao Zou, J. Hao, R. Liao
Oil-paper insulation is widely used as the insulating material in transformers. Temperature is one of the major factors causing mineral oil-paper insulation system ageing. In order to relieve mineral oil-paper insulation's thermal ageing problem, the thermally upgraded paper is used as the insulation system. In this paper, a thermal ageing experiment had been conducted on the thermally upgraded paper impregnated in mineral oil. Samples were collected on different days, then the space charge characteristic test was performed using pulsed electro acoustic method (PEA method). DC breakdown tests were conducted with and without pre stressing. A ramp test was conducted to determine the space charge injection threshold voltage. From the experiment result, the space charge injection threshold voltages for mineral oil-thermally upgraded paper at each thermal ageing state are attained. Thermal ageing of the insulation will not influence the space charge injection threshold voltage, but with further deterioration, the higher the corresponding voltage will be. The space charge injection for the samples is homo charge injection. The more the deterioration, the easier it becomes for the injection. Thermal ageing does not influence the DC breakdown voltage significantly. Pre stressing will increase samples' DC breakdown field strength. The more the deterioration of the sample, the more apparent the increase will be.
{"title":"DC Breakdown and Space Charge Characteristics of Mineral Oil Impregnated Thermally Upgraded Paper with Different Ageing Conditons","authors":"Runhao Zou, J. Hao, R. Liao","doi":"10.1109/ICDL.2019.8796784","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796784","url":null,"abstract":"Oil-paper insulation is widely used as the insulating material in transformers. Temperature is one of the major factors causing mineral oil-paper insulation system ageing. In order to relieve mineral oil-paper insulation's thermal ageing problem, the thermally upgraded paper is used as the insulation system. In this paper, a thermal ageing experiment had been conducted on the thermally upgraded paper impregnated in mineral oil. Samples were collected on different days, then the space charge characteristic test was performed using pulsed electro acoustic method (PEA method). DC breakdown tests were conducted with and without pre stressing. A ramp test was conducted to determine the space charge injection threshold voltage. From the experiment result, the space charge injection threshold voltages for mineral oil-thermally upgraded paper at each thermal ageing state are attained. Thermal ageing of the insulation will not influence the space charge injection threshold voltage, but with further deterioration, the higher the corresponding voltage will be. The space charge injection for the samples is homo charge injection. The more the deterioration, the easier it becomes for the injection. Thermal ageing does not influence the DC breakdown voltage significantly. Pre stressing will increase samples' DC breakdown field strength. The more the deterioration of the sample, the more apparent the increase will be.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115298078","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796546
Xiang Zhang, Zhongdong Wang, Qiang Liu, A. Gyore, K. Rapp
Retrofilling transformers with a new liquid has been considered as an option for life extension and/or uprating purposes. The determination of the new total liquid flow rate is of vital importance in assessing the effect of retrofilling on flow and temperature distributions in the winding, especially for ON transformers. This paper presents the determination of flow rate ratios for four liquids—a mineral oil, a GTL oil, a synthetic ester and a natural ester—in ON transformer retrofilling scenarios. Flow rate ratios among different liquids are provided for a simplified condition of linear radiator oil temperature variation. For a more realistic exponential radiator oil temperature variation, the detailed transformer geometric information is needed to estimate the total flow rate. In addition, a hydraulic winding network model is established to prove that “minor pressure losses” due to change of flow directions is indeed minor for ON transformer liquid flow conditions, justifying neglecting the minor losses in the deduction of the total liquid flow rate.
{"title":"Investigation of the Total Flow Rates in Oil Natural Transformer Retrofilling Scenarios","authors":"Xiang Zhang, Zhongdong Wang, Qiang Liu, A. Gyore, K. Rapp","doi":"10.1109/ICDL.2019.8796546","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796546","url":null,"abstract":"Retrofilling transformers with a new liquid has been considered as an option for life extension and/or uprating purposes. The determination of the new total liquid flow rate is of vital importance in assessing the effect of retrofilling on flow and temperature distributions in the winding, especially for ON transformers. This paper presents the determination of flow rate ratios for four liquids—a mineral oil, a GTL oil, a synthetic ester and a natural ester—in ON transformer retrofilling scenarios. Flow rate ratios among different liquids are provided for a simplified condition of linear radiator oil temperature variation. For a more realistic exponential radiator oil temperature variation, the detailed transformer geometric information is needed to estimate the total flow rate. In addition, a hydraulic winding network model is established to prove that “minor pressure losses” due to change of flow directions is indeed minor for ON transformer liquid flow conditions, justifying neglecting the minor losses in the deduction of the total liquid flow rate.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115312480","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796638
A. Kupershtokh, D. A. Medvedev
A non-stationary electrohydrodynamic model of a dielectric droplet dynamics on solid substrate in surrounding gas is developed. The equations for electric field potential and fluid dynamics are solved together. Computer 3D simulations of liquid dielectric droplets on wettable and superhydrophobic surfaces are carried out. The dynamics of the pinned droplet is also simulated. The droplets tend to elongate in the direction of DC electric field. The droplet can jump over a superhydrophobic substrate after the electric field is applied.
{"title":"Dielectric droplet on a superhydrophobic substrate in an electric field","authors":"A. Kupershtokh, D. A. Medvedev","doi":"10.1109/ICDL.2019.8796638","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796638","url":null,"abstract":"A non-stationary electrohydrodynamic model of a dielectric droplet dynamics on solid substrate in surrounding gas is developed. The equations for electric field potential and fluid dynamics are solved together. Computer 3D simulations of liquid dielectric droplets on wettable and superhydrophobic surfaces are carried out. The dynamics of the pinned droplet is also simulated. The droplets tend to elongate in the direction of DC electric field. The droplet can jump over a superhydrophobic substrate after the electric field is applied.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123309704","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796535
A. Tavakoli, L. D. Maria, D. Bartalesi, S. Garatti, S. Bittanti, B. Valecillos, U. Piovan
Transformers with loose or deformed windings can fail during an external short circuit with loss of service and heavy maintenance costs. The transformers’ tank vibration technique potentially offers a decisive solution for an on line continuous assessment of the integrity of structural elements in transformers. In this paper, the influence of sensor location on tank vibration measurements is addressed by means of Support Vector Machine (SVM) algorithms. Laboratory tests have been carried out in different points of the tank, on a typical oil filled power transformer under two extreme conditions, tight and loose windings. Preliminary results of SVM analysis of tank vibration spectra showed that it is possible to correctly identify winding looseness during repetitive sensor installation.
{"title":"Diagnosis of transformers based on vibration data","authors":"A. Tavakoli, L. D. Maria, D. Bartalesi, S. Garatti, S. Bittanti, B. Valecillos, U. Piovan","doi":"10.1109/ICDL.2019.8796535","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796535","url":null,"abstract":"Transformers with loose or deformed windings can fail during an external short circuit with loss of service and heavy maintenance costs. The transformers’ tank vibration technique potentially offers a decisive solution for an on line continuous assessment of the integrity of structural elements in transformers. In this paper, the influence of sensor location on tank vibration measurements is addressed by means of Support Vector Machine (SVM) algorithms. Laboratory tests have been carried out in different points of the tank, on a typical oil filled power transformer under two extreme conditions, tight and loose windings. Preliminary results of SVM analysis of tank vibration spectra showed that it is possible to correctly identify winding looseness during repetitive sensor installation.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125134068","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796800
R. Nakane, K. Kato, N. Hayakawa, H. Okubo
It is necessary to enhance an HVDC electrical insulation performance for further introduction of DC electric power systems. In AC/DC converter transformers under DC application, the electric field distributions are distorted due to the deposited charge on pressboard (PB). However, DC electric field stress in oil-PB composite insulation has not yet been clarified in detail. In this paper, we investigated the time and space dependent characteristics of DC electric field stress in oil from DC-on (initial state) to DC steady-state in oil-PB composite insulation systems. As a result, we quantitatively clarified that DC electric field stress strongly depends on the elapsed time and the location in the electric field space in oil. In particular, it was found that the most severe electric field stress in oil for the electrical insulation performance may emerge during the time transition process between initial DC-on to DC steady-state, using an insulated conductor lead and an actual AC/DC converter transformer model.
{"title":"Time and Space Transition of DC Electric Field Distributions in Oil-Pressboard Composite Insulation in AC/DC Converter Transformer","authors":"R. Nakane, K. Kato, N. Hayakawa, H. Okubo","doi":"10.1109/ICDL.2019.8796800","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796800","url":null,"abstract":"It is necessary to enhance an HVDC electrical insulation performance for further introduction of DC electric power systems. In AC/DC converter transformers under DC application, the electric field distributions are distorted due to the deposited charge on pressboard (PB). However, DC electric field stress in oil-PB composite insulation has not yet been clarified in detail. In this paper, we investigated the time and space dependent characteristics of DC electric field stress in oil from DC-on (initial state) to DC steady-state in oil-PB composite insulation systems. As a result, we quantitatively clarified that DC electric field stress strongly depends on the elapsed time and the location in the electric field space in oil. In particular, it was found that the most severe electric field stress in oil for the electrical insulation performance may emerge during the time transition process between initial DC-on to DC steady-state, using an insulated conductor lead and an actual AC/DC converter transformer model.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129443714","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796746
Artur Klarecki, P. Rózga
The studies presented in this paper were focused on comparative analysis of Weibull distribution curves determined for lightning impulse breakdown voltages of 1 mm thick pressboard samples impregnated with natural ester and mineral oil respectively. The analysis of the results was made using three-parameter Weibull distribution function with location parameter Vo (theoretical zero probability) meaning the threshold value of voltage below which breakdown does not happened. The curves obtained within the studies are in general similar in shape with some benefits in direction of curves connected with pressboard impregnated by natural ester liquid. Quantitatively the difference between the considered cases was found as very small (around 2 kV when comparing the Vo obtained). The reason for this may be the difference in electrical permittivity of pressboard impregnated by ester, which is a little bit higher in comparison with pressboard impregnated by mineral oil. The studies confirmed also that the applied three-parameter Weibull distribution is an excellent statistical tool for determination of threshold electrical strength of liquid-solid insulation systems.
{"title":"Three-Parameter Weibull Distribution Curves for LIBV of Pressboard Samples Impregnated with Natural Ester and Mineral Oil","authors":"Artur Klarecki, P. Rózga","doi":"10.1109/ICDL.2019.8796746","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796746","url":null,"abstract":"The studies presented in this paper were focused on comparative analysis of Weibull distribution curves determined for lightning impulse breakdown voltages of 1 mm thick pressboard samples impregnated with natural ester and mineral oil respectively. The analysis of the results was made using three-parameter Weibull distribution function with location parameter Vo (theoretical zero probability) meaning the threshold value of voltage below which breakdown does not happened. The curves obtained within the studies are in general similar in shape with some benefits in direction of curves connected with pressboard impregnated by natural ester liquid. Quantitatively the difference between the considered cases was found as very small (around 2 kV when comparing the Vo obtained). The reason for this may be the difference in electrical permittivity of pressboard impregnated by ester, which is a little bit higher in comparison with pressboard impregnated by mineral oil. The studies confirmed also that the applied three-parameter Weibull distribution is an excellent statistical tool for determination of threshold electrical strength of liquid-solid insulation systems.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129767764","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796558
J. M. Rodríguez-Serna, Ricardo Albarracín‐Sánchez, Juan Velasco, Ricardo Frascella, Víctor A. Primo
Nano-based dielectric fluids (NDF) seem to be a good alternative for improving dielectric and thermal characteristics of conventional liquid dielectric systems used in power transformers. Fe3O4 (magnetite) nanoparticles (NP) is one of the most investigated type of NP. Some experiments have shown that with its addition to mineral oil (MO) and ester, increases in breakdown voltage (BV) can be achieved applying both AC and DC voltages. This kind of NP have the advantage that can be handled and synthesized safely and easily using a two-steps method. Besides, streamer propagation can be reduced or avoided introducing Fe3O4 NP in dielectric fluids. These NP act as electronic traps and behave like slow-moving charged particles in the NDF. This behaviour as well as other dielectric characteristics such as resistivity, permittivity and loss tangent, depend on the type, size and concentration of NP. In this work, comparisons and analyses of thermal and dielectric performance of NDF with different Fe3O4 NP concentration are made taking into account the evolution and behaviour of streamers. It has been found that temperature in streamer tip, its length and speed depend on the Fe3O4 NP concentration and the BV is affected because of changes in streamer speed. The most adequate concentration for controlling the streamer has been obtained through simulations and comparisons with experimental results showing good agreement.
{"title":"Streamer Simulation in Nano-Based Dielectric Fluids at Different Fe3O4 Nanoparticle Concentrations","authors":"J. M. Rodríguez-Serna, Ricardo Albarracín‐Sánchez, Juan Velasco, Ricardo Frascella, Víctor A. Primo","doi":"10.1109/ICDL.2019.8796558","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796558","url":null,"abstract":"Nano-based dielectric fluids (NDF) seem to be a good alternative for improving dielectric and thermal characteristics of conventional liquid dielectric systems used in power transformers. Fe3O4 (magnetite) nanoparticles (NP) is one of the most investigated type of NP. Some experiments have shown that with its addition to mineral oil (MO) and ester, increases in breakdown voltage (BV) can be achieved applying both AC and DC voltages. This kind of NP have the advantage that can be handled and synthesized safely and easily using a two-steps method. Besides, streamer propagation can be reduced or avoided introducing Fe3O4 NP in dielectric fluids. These NP act as electronic traps and behave like slow-moving charged particles in the NDF. This behaviour as well as other dielectric characteristics such as resistivity, permittivity and loss tangent, depend on the type, size and concentration of NP. In this work, comparisons and analyses of thermal and dielectric performance of NDF with different Fe3O4 NP concentration are made taking into account the evolution and behaviour of streamers. It has been found that temperature in streamer tip, its length and speed depend on the Fe3O4 NP concentration and the BV is affected because of changes in streamer speed. The most adequate concentration for controlling the streamer has been obtained through simulations and comparisons with experimental results showing good agreement.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125931850","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 : 2019-06-01DOI: 10.1109/ICDL.2019.8796580
S. Maneerot, P. Nimsanong, Jompatara Siriworachanyadee, M. Leelajindakrairerk, K. Jariyanurat, N. Pattanadech
Currently alternative liquid insulation such as natural ester (FR3) is widely used as distribution transformer insulation because it provides outstandingly dielectric characteristics and natural friendly including highly affordable fire safety. Besides, palm oil is interesting liquid insulation for such transformers because of its distinguish dielectric properties. To analyze the dielectric properties of insulating material, polarization and depolarization current (PDC) measurement is one of the widely accepted non-destructive test technique. This paper presents the dielectric response analysis for the insulation system of a mineral oil immersed transformer, a natural ester (FR3) immersed transformer, and a palm oil immersed transformer by analyzing PDC test results. Three identical single phase transformers with 22kV/460V 30 kVA rated were designed and constructed. The first transformer was fully filled with mineral oil. The second and the third transformer was fully filled with natural ester (FR3) and palm oil respectively. After finishing the construction process, PDC measurement technique was applied for these transformers. The PDC measurement were performed for three case studies as follows: 1) dielectric response for the insulation between high voltage winding and low voltage winding, 2) dielectric response of high voltage winding insulation and low voltage connected to ground 3) dielectric response of high voltage and low voltage winding insulation by which the high voltage lead was connected to the low voltage lead. From the test results, it can be concluded that the dielectric response of the insulation system of the mineral oil immersed transformer was obviously different compared with that of the natural oil (FR3) immersed transformer and the palm oil immersed transformer. Moreover, the PDCs obtained from the tests were also analyzed and reported in this paper.
{"title":"Dielectric Response Analysis of Mineral Oil Immersed Transformer, Natural Ester(FR3) Immersed Transformer, and Palm Oil Immersed Transformer","authors":"S. Maneerot, P. Nimsanong, Jompatara Siriworachanyadee, M. Leelajindakrairerk, K. Jariyanurat, N. Pattanadech","doi":"10.1109/ICDL.2019.8796580","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796580","url":null,"abstract":"Currently alternative liquid insulation such as natural ester (FR3) is widely used as distribution transformer insulation because it provides outstandingly dielectric characteristics and natural friendly including highly affordable fire safety. Besides, palm oil is interesting liquid insulation for such transformers because of its distinguish dielectric properties. To analyze the dielectric properties of insulating material, polarization and depolarization current (PDC) measurement is one of the widely accepted non-destructive test technique. This paper presents the dielectric response analysis for the insulation system of a mineral oil immersed transformer, a natural ester (FR3) immersed transformer, and a palm oil immersed transformer by analyzing PDC test results. Three identical single phase transformers with 22kV/460V 30 kVA rated were designed and constructed. The first transformer was fully filled with mineral oil. The second and the third transformer was fully filled with natural ester (FR3) and palm oil respectively. After finishing the construction process, PDC measurement technique was applied for these transformers. The PDC measurement were performed for three case studies as follows: 1) dielectric response for the insulation between high voltage winding and low voltage winding, 2) dielectric response of high voltage winding insulation and low voltage connected to ground 3) dielectric response of high voltage and low voltage winding insulation by which the high voltage lead was connected to the low voltage lead. From the test results, it can be concluded that the dielectric response of the insulation system of the mineral oil immersed transformer was obviously different compared with that of the natural oil (FR3) immersed transformer and the palm oil immersed transformer. Moreover, the PDCs obtained from the tests were also analyzed and reported in this paper.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114341254","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}
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