Pub Date : 2014-09-08DOI: 10.1109/ICDL.2014.6893132
S. Singha, J. Viertel, M. Unge, J. Karlsson, Kjell Johansson, Håkan Faleke
Natural ester (NE) dielectric liquids have different physical and dielectric properties compared to mineral oil. For the design of power transformers with natural esters, such differences have to be addressed with appropriate changes in the design rules. This article reports the laboratory development of a novel natural ester liquid formulation that has significantly enhanced breakdown and acceleration voltages under non-uniform electric field geometries and at large electrode gaps. Considering the other relevant properties of this new liquid formulation for transformer applications, there is probably a scope to design environment-friendly power transformers at higher voltages and power ratings without significant modifications in the transformer design rules.
{"title":"Development of a natural ester liquid with significantly enhanced dielectric characteristics","authors":"S. Singha, J. Viertel, M. Unge, J. Karlsson, Kjell Johansson, Håkan Faleke","doi":"10.1109/ICDL.2014.6893132","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893132","url":null,"abstract":"Natural ester (NE) dielectric liquids have different physical and dielectric properties compared to mineral oil. For the design of power transformers with natural esters, such differences have to be addressed with appropriate changes in the design rules. This article reports the laboratory development of a novel natural ester liquid formulation that has significantly enhanced breakdown and acceleration voltages under non-uniform electric field geometries and at large electrode gaps. Considering the other relevant properties of this new liquid formulation for transformer applications, there is probably a scope to design environment-friendly power transformers at higher voltages and power ratings without significant modifications in the transformer design rules.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"26 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75764095","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893092
T. Grav, L. Lundgaard
Partial discharge (PD) measurement in a needle to plane gap is suggested by IEC used for ranking dielectric liquids. This paper investigates PD behavior in eight liquids using a 20 mm ac stressed needle to plane gap. Parameters varied were tip radius, frequency and voltage. Both discharge phase distributions and pulse sequences were studied. PD occurrence was highly correlated to the frequency of the applied voltage. A higher frequency of 600 Hz gave a higher PD rate than the lower frequencies, like 60 Hz. The tip radius does also affect the PD pattern. The influences from tip radius and frequency indicate a strong correlation between space charges and PD initiation. It was observed that large positive PDs almost always was preceded and followed by a smaller negative PD in the neighboring half cycles, indicating an influence from charges of opposite polarity created in the previous half cycle. Exposing the gap to X-rays gave a PD burst for both polarities. This indicates that electrons are needed for initiation of PDs and that lack of electrons is the reason for low occurrence rate of positive PDs.
{"title":"PD occurrence in liquids in ac stressed needle plane gap","authors":"T. Grav, L. Lundgaard","doi":"10.1109/ICDL.2014.6893092","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893092","url":null,"abstract":"Partial discharge (PD) measurement in a needle to plane gap is suggested by IEC used for ranking dielectric liquids. This paper investigates PD behavior in eight liquids using a 20 mm ac stressed needle to plane gap. Parameters varied were tip radius, frequency and voltage. Both discharge phase distributions and pulse sequences were studied. PD occurrence was highly correlated to the frequency of the applied voltage. A higher frequency of 600 Hz gave a higher PD rate than the lower frequencies, like 60 Hz. The tip radius does also affect the PD pattern. The influences from tip radius and frequency indicate a strong correlation between space charges and PD initiation. It was observed that large positive PDs almost always was preceded and followed by a smaller negative PD in the neighboring half cycles, indicating an influence from charges of opposite polarity created in the previous half cycle. Exposing the gap to X-rays gave a PD burst for both polarities. This indicates that electrons are needed for initiation of PDs and that lack of electrons is the reason for low occurrence rate of positive PDs.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"110 3 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76124942","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893083
M. Apfelbaum
The system of electrohydrodynamic equations at a pre-breakdown liquid insulator is given. The influence of electric field on the partial dissociation molecules rate is taken into account. The stationary and nonstationary solutions for electric potential and hydrodynamic velocity distributions are obtained. The theoretical results are compared with experiments.
{"title":"The pre-breakdown solutions by electrohydrodynamic equations for liquid insulators","authors":"M. Apfelbaum","doi":"10.1109/ICDL.2014.6893083","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893083","url":null,"abstract":"The system of electrohydrodynamic equations at a pre-breakdown liquid insulator is given. The influence of electric field on the partial dissociation molecules rate is taken into account. The stationary and nonstationary solutions for electric potential and hydrodynamic velocity distributions are obtained. The theoretical results are compared with experiments.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"59 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87505032","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893121
P. Trnka, V. Mentlík, M. Svoboda
Mineral oils, which are currently used as electrical insulation liquids, have due their uneasy biodegradability significantly negative impact on ecology and human health. Thus it is necessary to search for new possible liquids based on vegetable oils or natural esters, which might substitute crude oil products in practical applications. These liquids are easy biodegradable while economically acceptable at the same time. However liquid emphasizing biodegradability and good electrical insulating properties at the same time is not in central Europe produced yet. This paper suggests new alternative insulating mixtures, which might fulfill the above demands. Such a fluid should be technically equivalent to the currently used mineral oils.
{"title":"Ecologically acceptable insulating liquids for electrical appliances","authors":"P. Trnka, V. Mentlík, M. Svoboda","doi":"10.1109/ICDL.2014.6893121","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893121","url":null,"abstract":"Mineral oils, which are currently used as electrical insulation liquids, have due their uneasy biodegradability significantly negative impact on ecology and human health. Thus it is necessary to search for new possible liquids based on vegetable oils or natural esters, which might substitute crude oil products in practical applications. These liquids are easy biodegradable while economically acceptable at the same time. However liquid emphasizing biodegradability and good electrical insulating properties at the same time is not in central Europe produced yet. This paper suggests new alternative insulating mixtures, which might fulfill the above demands. Such a fluid should be technically equivalent to the currently used mineral oils.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"3 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91530350","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893103
Zhifeng Hu, K. Ma, Wei Wang, M. Rafiq, You Zhou, Qi Wang, Yue-fan Du, Cheng-Rong Li, Y. Lv
The insulation properties of aged transformer oil-based TiO2 nanofluids were investigated in this paper. Firstly, both pure oil and TiO2 nanofluids were accelerated thermal aged at 130 °C for 36 days. During the accelerated thermal aging process AC (50 Hz) breakdown voltage, lightening impulse breakdown voltage, and partial discharge inception voltage (PDIV) of both samples were measured periodically. The results shows that TiO2 nanofluids possessed better insulation properties than pure oil even though insulation properties of both aged pure oil and nanofluids were decreased during the aging process. After aging for 36 days, the PDIV and AC breakdown strength of nanofluids was 1.1 and 1.4 times as that of pure oil respectively. Possible mechanisms of the phenomenon above were also discussed. In conclusion, the transformer oil-based TiO2 nanofluids process a better anti-aging property than that of pure oil,but the stability of nanofluids need be further improved to bear the complex and extreme condition inside high-voltage level and heavy load transformers in service.
{"title":"Thermal aging properties of transformer oil-based TiO2 nanofluids","authors":"Zhifeng Hu, K. Ma, Wei Wang, M. Rafiq, You Zhou, Qi Wang, Yue-fan Du, Cheng-Rong Li, Y. Lv","doi":"10.1109/ICDL.2014.6893103","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893103","url":null,"abstract":"The insulation properties of aged transformer oil-based TiO2 nanofluids were investigated in this paper. Firstly, both pure oil and TiO2 nanofluids were accelerated thermal aged at 130 °C for 36 days. During the accelerated thermal aging process AC (50 Hz) breakdown voltage, lightening impulse breakdown voltage, and partial discharge inception voltage (PDIV) of both samples were measured periodically. The results shows that TiO2 nanofluids possessed better insulation properties than pure oil even though insulation properties of both aged pure oil and nanofluids were decreased during the aging process. After aging for 36 days, the PDIV and AC breakdown strength of nanofluids was 1.1 and 1.4 times as that of pure oil respectively. Possible mechanisms of the phenomenon above were also discussed. In conclusion, the transformer oil-based TiO2 nanofluids process a better anti-aging property than that of pure oil,but the stability of nanofluids need be further improved to bear the complex and extreme condition inside high-voltage level and heavy load transformers in service.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79599048","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893089
H. B. H. Sitorus, R. Setiabudy, S. Bismo, A. Beroual
This paper reports the investigation of jatropha curcas seeds oil as an alternative option to replace mineral oil in power transformers. This product has several advantages that recommend both its production and usage over that of other vegetable oils as crude palm oil and rape-seeds oil because it may be grown on marginal or degraded soils thus avoiding the need to utilize those more fertile soils currently being used by smallholders to grow their staple crops; and it will readily grow in areas where annual rainfall levels are significantly lower than those required by other species such as oil palm, rape-seeds oil, sunflower oil, soybeans oil, corn oil and others. For instance, these plants can be grown on all soil types in Indonesia, even on barren soil. The barren soil types can be found in many parts of eastern Indonesia that remain untapped because of the difficulty planted with other crops. Moreover, jatropha curcas oil is non-food crops. Jatropha curcas oil is processed by alkali base catalyzed esterification process using potassium hydroxide (KOH) to produce jatropha curcas methyl ester oil (JMEO) that is a product the viscosity and acidity are acceptable for high voltage equipment especially in power transformer. The physicochemical (water content, viscosity, acidity ...) and electrical (dielectric strength) properties of JMEO were measured. For comparison, we also measured breakdown voltage of mineral oil (MO) in the same experimental conditions. The obtained results show that the average AC breakdown voltages of JMEO and MO are too close.
{"title":"Physicochemical and electrical properties of jatropha curcas methyl ester oil as a substitute for mineral oil","authors":"H. B. H. Sitorus, R. Setiabudy, S. Bismo, A. Beroual","doi":"10.1109/ICDL.2014.6893089","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893089","url":null,"abstract":"This paper reports the investigation of jatropha curcas seeds oil as an alternative option to replace mineral oil in power transformers. This product has several advantages that recommend both its production and usage over that of other vegetable oils as crude palm oil and rape-seeds oil because it may be grown on marginal or degraded soils thus avoiding the need to utilize those more fertile soils currently being used by smallholders to grow their staple crops; and it will readily grow in areas where annual rainfall levels are significantly lower than those required by other species such as oil palm, rape-seeds oil, sunflower oil, soybeans oil, corn oil and others. For instance, these plants can be grown on all soil types in Indonesia, even on barren soil. The barren soil types can be found in many parts of eastern Indonesia that remain untapped because of the difficulty planted with other crops. Moreover, jatropha curcas oil is non-food crops. Jatropha curcas oil is processed by alkali base catalyzed esterification process using potassium hydroxide (KOH) to produce jatropha curcas methyl ester oil (JMEO) that is a product the viscosity and acidity are acceptable for high voltage equipment especially in power transformer. The physicochemical (water content, viscosity, acidity ...) and electrical (dielectric strength) properties of JMEO were measured. For comparison, we also measured breakdown voltage of mineral oil (MO) in the same experimental conditions. The obtained results show that the average AC breakdown voltages of JMEO and MO are too close.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"10 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88624142","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893102
D. Koulova, C. Louste, H. Romat
The influence of the electric field on surface waves in diesel oil is studied experimentally. The experimental device is mainly composed of a tank filled with diesel oil and two parallel metallic electrodes: one of them is immersed in the liquid and brought to a high potential, the other one is placed above the liquid. The surface waves are generated by a vibrator for which the frequency and amplitude of the vibrations can be controlled. The differences of potential applied can vary. Particle Image Velocimetry (PIV) is used to measure the velocity of the propagation waves on the diesel oil/air surface. The objective is to determine the influence of the electric field on the wavelengths at different amplitudes and frequencies as well as to calculate the surface tension. In this article we show that the apparent surface tension of the diesel oil decreases when the voltage is applied.
{"title":"Experimental study on the influence of the electric field on free surface waves","authors":"D. Koulova, C. Louste, H. Romat","doi":"10.1109/ICDL.2014.6893102","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893102","url":null,"abstract":"The influence of the electric field on surface waves in diesel oil is studied experimentally. The experimental device is mainly composed of a tank filled with diesel oil and two parallel metallic electrodes: one of them is immersed in the liquid and brought to a high potential, the other one is placed above the liquid. The surface waves are generated by a vibrator for which the frequency and amplitude of the vibrations can be controlled. The differences of potential applied can vary. Particle Image Velocimetry (PIV) is used to measure the velocity of the propagation waves on the diesel oil/air surface. The objective is to determine the influence of the electric field on the wavelengths at different amplitudes and frequencies as well as to calculate the surface tension. In this article we show that the apparent surface tension of the diesel oil decreases when the voltage is applied.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"26 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81953132","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893076
P. Rózga
This article describes the experimental studies on streamer propagation in synthetic ester. These studies concern the small 20 mm gap of point-plane electrode arrangement and positive lightning impulse voltage. The spatial shapes of the developing streamers, oscillograms of emitted light and propagation velocities were analyzed and compared with the same features registered for mineral oil. Two streamer propagation modes were observed in both of the investigated liquids. The slow 2nd mode streamers developed below the socalled acceleration voltage and fast 3rd mode streamers at acceleration voltage and above it. However, the difference between both the considered liquids was noticed in the threshold value of testing voltage at which the 3rd mode streamers appeared. Fast positive streamers started to develop in synthetic ester at lower testing voltage (of about 26 kV) than in the case of mineral oil. This means that synthetic esters have a lower ability to protect against overvoltages like standard lightning impulse, even at small (20 mm) electrode gap.
{"title":"Positive streamer propagation in small gap of synthetic ester under lightning impulse","authors":"P. Rózga","doi":"10.1109/ICDL.2014.6893076","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893076","url":null,"abstract":"This article describes the experimental studies on streamer propagation in synthetic ester. These studies concern the small 20 mm gap of point-plane electrode arrangement and positive lightning impulse voltage. The spatial shapes of the developing streamers, oscillograms of emitted light and propagation velocities were analyzed and compared with the same features registered for mineral oil. Two streamer propagation modes were observed in both of the investigated liquids. The slow 2nd mode streamers developed below the socalled acceleration voltage and fast 3rd mode streamers at acceleration voltage and above it. However, the difference between both the considered liquids was noticed in the threshold value of testing voltage at which the 3rd mode streamers appeared. Fast positive streamers started to develop in synthetic ester at lower testing voltage (of about 26 kV) than in the case of mineral oil. This means that synthetic esters have a lower ability to protect against overvoltages like standard lightning impulse, even at small (20 mm) electrode gap.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"21 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89873214","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893085
J. Ulrych, M. Svoboda, R. Polanský, J. Pihera
This paper deals with analysis and comparison of the specific dielectric properties and chemical structure of sunflower, rapeseed and commonly used transformer mineral oil. The measured sunflower and rapeseed oils are natural ester molecules with a triglyceride structure and have mainly excellent fire resistance and biodegradability. The measured common mineral oil is produced from mixture of hydrocarbons from crude oil and belongs to the group of naphthenic oils consisting mainly of cycloalkanes and is relatively flammable and dangerous for living environment. The measurement was performed by means of the dielectric spectroscopy method. The real and imaginary parts of complex permittivity of measured samples were analyzed in a frequency range from 50 mHz to 100 kHz and in temperature range from -50 °C to +90 °C. The measured spectrums displayed relaxation processes (α and β) as well as the conductive component (σ). The results showed that the measured dielectric properties of the investigated vegetable oils are very similar to each other in the evaluated frequency range, but differs from the common mineral oil properties. The common mineral oil had these properties much better than the sunflower and rapeseed oils. Adapted mixtures of vegetable and mineral oils with suitable inhibitors can be considered to using as an alternative insulation liquid into power transformers instead of mineral oils.
{"title":"Dielectric analysis of vegetable and mineral oils","authors":"J. Ulrych, M. Svoboda, R. Polanský, J. Pihera","doi":"10.1109/ICDL.2014.6893085","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893085","url":null,"abstract":"This paper deals with analysis and comparison of the specific dielectric properties and chemical structure of sunflower, rapeseed and commonly used transformer mineral oil. The measured sunflower and rapeseed oils are natural ester molecules with a triglyceride structure and have mainly excellent fire resistance and biodegradability. The measured common mineral oil is produced from mixture of hydrocarbons from crude oil and belongs to the group of naphthenic oils consisting mainly of cycloalkanes and is relatively flammable and dangerous for living environment. The measurement was performed by means of the dielectric spectroscopy method. The real and imaginary parts of complex permittivity of measured samples were analyzed in a frequency range from 50 mHz to 100 kHz and in temperature range from -50 °C to +90 °C. The measured spectrums displayed relaxation processes (α and β) as well as the conductive component (σ). The results showed that the measured dielectric properties of the investigated vegetable oils are very similar to each other in the evaluated frequency range, but differs from the common mineral oil properties. The common mineral oil had these properties much better than the sunflower and rapeseed oils. Adapted mixtures of vegetable and mineral oils with suitable inhibitors can be considered to using as an alternative insulation liquid into power transformers instead of mineral oils.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"36 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76765351","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 : 2014-09-08DOI: 10.1109/ICDL.2014.6893152
R. Hollertz, L. Wagberga, C. Pitois
Papers, foams and gels from nanofibrillated cellulose (NFC) have emerged as promising materials for various applications. In this study NFC from a Kraft Pulp used in traditional electrical insulation was produced with the aid of a high pressure homogenizer. Papers were manufactured and their mechanical properties as well as their dielectric responses in oil were measured. The disintegration results in a durable, flexible papers with high strength and density while the dielectric response correlate to that of Kraft Paper with similar density. This paper also includes a description on how inorganic nanoparticles was used to modify the properties of the fibres through a topochemical modification. In this latter technique a Layer-by-Layer technology was used where the charges of the fibres are treated with consecutive layers of oppositely charged polyelectrolytes and nanoparticles.
{"title":"Novel cellulose nanomaterials","authors":"R. Hollertz, L. Wagberga, C. Pitois","doi":"10.1109/ICDL.2014.6893152","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893152","url":null,"abstract":"Papers, foams and gels from nanofibrillated cellulose (NFC) have emerged as promising materials for various applications. In this study NFC from a Kraft Pulp used in traditional electrical insulation was produced with the aid of a high pressure homogenizer. Papers were manufactured and their mechanical properties as well as their dielectric responses in oil were measured. The disintegration results in a durable, flexible papers with high strength and density while the dielectric response correlate to that of Kraft Paper with similar density. This paper also includes a description on how inorganic nanoparticles was used to modify the properties of the fibres through a topochemical modification. In this latter technique a Layer-by-Layer technology was used where the charges of the fibres are treated with consecutive layers of oppositely charged polyelectrolytes and nanoparticles.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"80 3 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77852498","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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