Pub Date : 2020-07-05DOI: 10.1109/ICD46958.2020.9341957
S. Gortschakow, P. Pieterse, M. Hilbert, R. Kozakov, D. Uhrlandt, M. Kurrat
Light emission and electrical signals of partial discharge (PD) events in artificially introduced defects in insulating medium, namely polyethylene, polyvinyl chloride (PVC), silicone and polydimethylsiloxane (PDMS) have been examined. Internal discharges in a micro void and external discharges on insulator surface have been created using two specific experimental setups, which allow for observation of single discharges. The light pulses from single discharge events were registered by a photomultiplier. The discharge images have been acquired by an iCCD cameras with single and double stage amplification. Electrical signals have been measured using wideband probes. Two model arrangements have been developed and applied. Results of optical measurements are compared with conventional phase resolved partial discharge (PRPD) patterns. There exist different correlation modes between light intensity and value of partial discharge current, which can be ascribed to different type of PD origins. The comparison of optical and electrical signals shows a good correlation between both detection methods. Analysis of obtained discharge patterns in dependence on used material and electrode polarity is presented. It is shown that optical signals obtained from proper diagnostic devices carry similar information as conventional PRPD diagrams. The results of investigations can be used for development of new PD diagnostics.
{"title":"Electro-Optical Diagnostics of Single Partial Discharges","authors":"S. Gortschakow, P. Pieterse, M. Hilbert, R. Kozakov, D. Uhrlandt, M. Kurrat","doi":"10.1109/ICD46958.2020.9341957","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341957","url":null,"abstract":"Light emission and electrical signals of partial discharge (PD) events in artificially introduced defects in insulating medium, namely polyethylene, polyvinyl chloride (PVC), silicone and polydimethylsiloxane (PDMS) have been examined. Internal discharges in a micro void and external discharges on insulator surface have been created using two specific experimental setups, which allow for observation of single discharges. The light pulses from single discharge events were registered by a photomultiplier. The discharge images have been acquired by an iCCD cameras with single and double stage amplification. Electrical signals have been measured using wideband probes. Two model arrangements have been developed and applied. Results of optical measurements are compared with conventional phase resolved partial discharge (PRPD) patterns. There exist different correlation modes between light intensity and value of partial discharge current, which can be ascribed to different type of PD origins. The comparison of optical and electrical signals shows a good correlation between both detection methods. Analysis of obtained discharge patterns in dependence on used material and electrode polarity is presented. It is shown that optical signals obtained from proper diagnostic devices carry similar information as conventional PRPD diagrams. The results of investigations can be used for development of new PD diagnostics.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"8 1","pages":"850-853"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83468206","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341944
Yuya Miyazaki, N. Hirai, Y. Ohki
The degradation behavior of cross-linked polyethylene (XLPE) exposed to heat and radiation was investigated, focusing on its changes in chemical structure and mechanical properties. Infrared absorption spectroscopy (FT-IR), differential scanning calorimetry (DSC), and tensile tests were conducted. At the aging condition becomes more severe, the absorption due to carbonyl groups increases. In accord with this, the elongation at break decreases exponentially, while the enthalpy of fusion due to the melting of crystals decreases. When XLPE is exposed to heat and radiation, it is oxidized, which lowers the crystallinity and makes the crystals smaller. As a result, the mechanical properties of XLPE become degraded.
{"title":"Changes in Chemical Structure and Mechanical Properties Induced in Cross-linked Polyethylene by Thermal and Radiation Aging","authors":"Yuya Miyazaki, N. Hirai, Y. Ohki","doi":"10.1109/ICD46958.2020.9341944","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341944","url":null,"abstract":"The degradation behavior of cross-linked polyethylene (XLPE) exposed to heat and radiation was investigated, focusing on its changes in chemical structure and mechanical properties. Infrared absorption spectroscopy (FT-IR), differential scanning calorimetry (DSC), and tensile tests were conducted. At the aging condition becomes more severe, the absorption due to carbonyl groups increases. In accord with this, the elongation at break decreases exponentially, while the enthalpy of fusion due to the melting of crystals decreases. When XLPE is exposed to heat and radiation, it is oxidized, which lowers the crystallinity and makes the crystals smaller. As a result, the mechanical properties of XLPE become degraded.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"21 1","pages":"45-48"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78991293","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341931
S. Thakur, G. Callender, T. Andritsch, P. Lewin, A. Shaw, O. Cwikowski
A growing interest is observed in research to explore biodegradable alternative fluids as liquid insulation in high voltage equipment, due to their dielectric strength, environmental friendliness and enhanced fire safety. The present report deals with comparing the performance of possible alternative oils with silicone oil, which is typically used in the cable sealing ends. A detailed study of various physicochemical aspects and the impact of moisture ingress on these properties of mineral oil, natural and synthetic ester oil, and silicone oil is conducted. This work aims to identify the best liquid dielectric suitable for its application for cable terminations.
{"title":"A comparative analysis of different dielectric fluids for cable sealing ends","authors":"S. Thakur, G. Callender, T. Andritsch, P. Lewin, A. Shaw, O. Cwikowski","doi":"10.1109/ICD46958.2020.9341931","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341931","url":null,"abstract":"A growing interest is observed in research to explore biodegradable alternative fluids as liquid insulation in high voltage equipment, due to their dielectric strength, environmental friendliness and enhanced fire safety. The present report deals with comparing the performance of possible alternative oils with silicone oil, which is typically used in the cable sealing ends. A detailed study of various physicochemical aspects and the impact of moisture ingress on these properties of mineral oil, natural and synthetic ester oil, and silicone oil is conducted. This work aims to identify the best liquid dielectric suitable for its application for cable terminations.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"105 1","pages":"762-765"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79181426","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341996
G. Callender, P. Seri, R. Ghosh
This paper is intended to contribute to research into the interpretation of PD measurements under DC conditions. A simple PD system comprising of a cylindrical air filled void surrounded by polypropylene based copolymers is considered. A DC ramp of 1 kV/s reaching 10 kV was applied to the system and PD activity recorded from the start of the ramp for 104 seconds. An equivalent simulation model was constructed and used to investigate the influence of different phenomena. It was demonstrated that surface conduction is likely to play a crucial role in the applied field dynamics, leading to the cessation of PD activity. It also appears that charge deployed by PDs must be undergoing rapid recombination in order to support the high repetition rate in the first 1000 s of the experiment. The future work required to develop a full PD activity model is discussed.
{"title":"Simulations of Electric Field Dynamics for DC Partial Discharge Sequences","authors":"G. Callender, P. Seri, R. Ghosh","doi":"10.1109/ICD46958.2020.9341996","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341996","url":null,"abstract":"This paper is intended to contribute to research into the interpretation of PD measurements under DC conditions. A simple PD system comprising of a cylindrical air filled void surrounded by polypropylene based copolymers is considered. A DC ramp of 1 kV/s reaching 10 kV was applied to the system and PD activity recorded from the start of the ramp for 104 seconds. An equivalent simulation model was constructed and used to investigate the influence of different phenomena. It was demonstrated that surface conduction is likely to play a crucial role in the applied field dynamics, leading to the cessation of PD activity. It also appears that charge deployed by PDs must be undergoing rapid recombination in order to support the high repetition rate in the first 1000 s of the experiment. The future work required to develop a full PD activity model is discussed.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"55 1","pages":"501-504"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83903722","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9342019
Weiwang Wang, Zhiqiang Guo, H. Miyake, Y. Tanaka, Shengtao Li
This paper aims at the measurement of the time dependence of the internal space charge and analysis of radiation induced conduction (RIC) in polyimide caused by electron beam irradiation. Both the normal PEA method and an “on-line” PEA system were employed to detect the space charge profiles after and during the electron irradiation. In view of that, a small size PEA device with a ring high voltage electrode was used for the “on-line” measurement. In addition, the electric conduction was discussed by the RIC theory. Negative charge accumulations were introduced by the irradiated electrons, which increase with the increase of electron energy and density. The behaviors of RIC depend on electron energy, indicating an enhancement with high electron energy. These phenomena are closely related to the charge deposition and electron-hole pairs. High energy and density of the electron beams introduced large amounts of negative charge accumulations. Meanwhile, they contributed to the high level of RIC. Consequently, the space charge would maintain the dynamic equilibrium in polyimide film.
{"title":"Radiation induced conduction and space charge dynamics in polyimide revealed by off-line and online PEA method","authors":"Weiwang Wang, Zhiqiang Guo, H. Miyake, Y. Tanaka, Shengtao Li","doi":"10.1109/ICD46958.2020.9342019","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342019","url":null,"abstract":"This paper aims at the measurement of the time dependence of the internal space charge and analysis of radiation induced conduction (RIC) in polyimide caused by electron beam irradiation. Both the normal PEA method and an “on-line” PEA system were employed to detect the space charge profiles after and during the electron irradiation. In view of that, a small size PEA device with a ring high voltage electrode was used for the “on-line” measurement. In addition, the electric conduction was discussed by the RIC theory. Negative charge accumulations were introduced by the irradiated electrons, which increase with the increase of electron energy and density. The behaviors of RIC depend on electron energy, indicating an enhancement with high electron energy. These phenomena are closely related to the charge deposition and electron-hole pairs. High energy and density of the electron beams introduced large amounts of negative charge accumulations. Meanwhile, they contributed to the high level of RIC. Consequently, the space charge would maintain the dynamic equilibrium in polyimide film.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"2 1","pages":"375-378"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90158394","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341873
J. Vocke, R. Möller, R. Puffer, B. Soppe
Insulating oils and medium-frequency high voltages come together primarily where power electronic components are used, such as in power electronic transformers. For reliable long-term use, the insulation behaviour and, in particular, the breakdown voltage of the insulating oils at medium-frequency voltages is relevant, especially under consideration of ageing. Therefore, this paper investigates the influence of thermal ageing on the dielectric strength of insulating oil at medium frequency with an accelerated ageing test. Three insulating oils are each stored together with copper plates and insulating paper at 120 °C with controlled addition of air for an accelerated ageing. An oil sample is taken at fixed intervals and the breakdown voltage is determined for 2.2 kHz, 5.3 kHz and 8.6 kHz. In addition, the dielectric properties, acid number, water content and viscosity of each sample are determined. The investigations show a clear ageing dependency only for the acid number and the loss factor, all other parameters examined do not show such trend.
{"title":"Investigation of the Breakdown Voltage of Insulation Oils at Medium Frequency after Thermal Ageing","authors":"J. Vocke, R. Möller, R. Puffer, B. Soppe","doi":"10.1109/ICD46958.2020.9341873","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341873","url":null,"abstract":"Insulating oils and medium-frequency high voltages come together primarily where power electronic components are used, such as in power electronic transformers. For reliable long-term use, the insulation behaviour and, in particular, the breakdown voltage of the insulating oils at medium-frequency voltages is relevant, especially under consideration of ageing. Therefore, this paper investigates the influence of thermal ageing on the dielectric strength of insulating oil at medium frequency with an accelerated ageing test. Three insulating oils are each stored together with copper plates and insulating paper at 120 °C with controlled addition of air for an accelerated ageing. An oil sample is taken at fixed intervals and the breakdown voltage is determined for 2.2 kHz, 5.3 kHz and 8.6 kHz. In addition, the dielectric properties, acid number, water content and viscosity of each sample are determined. The investigations show a clear ageing dependency only for the acid number and the loss factor, all other parameters examined do not show such trend.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"18 1","pages":"716-719"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88767371","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341912
V. Belko, O. Emelyanov, I. Ivanov, N. Fedotov
The influence of metallized polypropylene demetallization processes, such as an electric explosion of metal layer and metal evaporation due to surface arc discharge, was investigated. 6 $mu$ m thick polymer film with aluminum and zinc metallization were tested. It was found that electric explosion and surface arc impact on polymer surface cause 20 and 30 percent reduction of breakdown strength for aluminum metallization, and 14 and 21 percent for zinc metallization, respectively. The results are useful for choosing the parameters of MFC voltage overstressing regimes.
{"title":"Influence of Demetallization Processes on Capacitor Grade Polymer Films Breakdown Strength","authors":"V. Belko, O. Emelyanov, I. Ivanov, N. Fedotov","doi":"10.1109/ICD46958.2020.9341912","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341912","url":null,"abstract":"The influence of metallized polypropylene demetallization processes, such as an electric explosion of metal layer and metal evaporation due to surface arc discharge, was investigated. 6 $mu$ m thick polymer film with aluminum and zinc metallization were tested. It was found that electric explosion and surface arc impact on polymer surface cause 20 and 30 percent reduction of breakdown strength for aluminum metallization, and 14 and 21 percent for zinc metallization, respectively. The results are useful for choosing the parameters of MFC voltage overstressing regimes.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"37 1","pages":"166-168"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89112411","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341930
M. Ferraris, T. J. Murray, M. Viola
European regulation changes have pushed electric machine manufacturers to request new materials suitable for impregnation of High Voltage motors and generators that are also compliant with European health restrictions. Until now, the most widely used materials for coils insulation are a blend of epoxy resin and anhydride that impregnates mica tapes, containing an epoxy binder with a Zinc naphthenate catalyst, which has the advantage of stability in storage tanks and good thermal and electrical properties. The development of a new impregnating resin, made with a hybrid epoxy-polyester chemistry, highlighted the need to find a way to improve compatibility with mica tapes. This new resin / tape combination has been visually evaluated, as first step, and then tested on bars, observing how dissipation factor versus voltage change after thermal ageing at high temperatures. Test bars made with new resin/tape combination withstood thermal ageing for a longer time than reference materials, confirming that compatibility between impregnating resin and mica tapes is a crucial factor influencing thermal resistance of a coil main wall insulation system.
{"title":"New chemistry for impregnation of HV machines: influence of compatibility between resin and mica tapes","authors":"M. Ferraris, T. J. Murray, M. Viola","doi":"10.1109/ICD46958.2020.9341930","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341930","url":null,"abstract":"European regulation changes have pushed electric machine manufacturers to request new materials suitable for impregnation of High Voltage motors and generators that are also compliant with European health restrictions. Until now, the most widely used materials for coils insulation are a blend of epoxy resin and anhydride that impregnates mica tapes, containing an epoxy binder with a Zinc naphthenate catalyst, which has the advantage of stability in storage tanks and good thermal and electrical properties. The development of a new impregnating resin, made with a hybrid epoxy-polyester chemistry, highlighted the need to find a way to improve compatibility with mica tapes. This new resin / tape combination has been visually evaluated, as first step, and then tested on bars, observing how dissipation factor versus voltage change after thermal ageing at high temperatures. Test bars made with new resin/tape combination withstood thermal ageing for a longer time than reference materials, confirming that compatibility between impregnating resin and mica tapes is a crucial factor influencing thermal resistance of a coil main wall insulation system.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"35 1","pages":"685-688"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86438373","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9342009
Céline Corbrion, S. Holé
A 2-$mu$m-thick polypropylene sample has been subjected to 10 kV/mm for 4 weeks. Thanks to surface temperature measurement along with heat pulse measurement, it is possible to detect the position at which the electric field varies inside the sample even without inverse convolution calculation.
{"title":"Interface charge effect measurement in 2-μm-thick polypropylene sample under voltage with thermal method","authors":"Céline Corbrion, S. Holé","doi":"10.1109/ICD46958.2020.9342009","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342009","url":null,"abstract":"A 2-$mu$m-thick polypropylene sample has been subjected to 10 kV/mm for 4 weeks. Thanks to surface temperature measurement along with heat pulse measurement, it is possible to detect the position at which the electric field varies inside the sample even without inverse convolution calculation.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"8 10 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89673281","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 : 2020-07-05DOI: 10.1109/ICD46958.2020.9341925
M. Fan, Zhonglei Li, B. Du, S. Zhou
Polypropylene (PP) is regarded as a recyclable alternative to XLPE for cable insulation on account of its higher heat resistance and higher electrical resistivity. The dielectric relaxation and trap level characteristics of isotactic PP (iPP), syndiotactic PP (sPP) as well as atactic PP (aPP) blends are investigated. The associations between polymer polarization response and traps level characteristics of PP blends are discussed. Frequency-domain dielectric spectroscopy (FDS) methods are used to analyze the polarization response of five PP blends at 50, 70 and 90 0C. Isothermal surface potential decay (ISPD) tests are performed to acquire the traps level distribution and the influences of traps level characteristics on the dielectric response are discussed. The polymer polarization behaviours a and $delta$ of five samples is closely related to segmental movements and carriers hopping behaviours, separately. The intensity of a relaxation strength ($Deltavarepsilon_{a}$) declines with the increase of sPP content, because the related coefficient (g) between PP molecular chains is reduced. The calculated energy $E_{tau}$ for $delta$ process is in proportion to the shallow traps level, because the shallow traps with a higher level increase the potential barriers of carriers hopping behaviors. The increase in temperature causes the dipole to undergo intense Brownian motion in the electric field, resulting in a decrease in $Deltavarepsilon_{a}$ with increasing temperature. The thermal motion of the charge increases the mobility of carriers in the PP and causes $Deltavarepsilon_{delta}$ to increasewith increasingtemperature.
{"title":"Effect of sPP Content on Dielectric Relaxation and Trap Level Characteristics of PP blend insulation","authors":"M. Fan, Zhonglei Li, B. Du, S. Zhou","doi":"10.1109/ICD46958.2020.9341925","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341925","url":null,"abstract":"Polypropylene (PP) is regarded as a recyclable alternative to XLPE for cable insulation on account of its higher heat resistance and higher electrical resistivity. The dielectric relaxation and trap level characteristics of isotactic PP (iPP), syndiotactic PP (sPP) as well as atactic PP (aPP) blends are investigated. The associations between polymer polarization response and traps level characteristics of PP blends are discussed. Frequency-domain dielectric spectroscopy (FDS) methods are used to analyze the polarization response of five PP blends at 50, 70 and 90 0C. Isothermal surface potential decay (ISPD) tests are performed to acquire the traps level distribution and the influences of traps level characteristics on the dielectric response are discussed. The polymer polarization behaviours a and $delta$ of five samples is closely related to segmental movements and carriers hopping behaviours, separately. The intensity of a relaxation strength ($Deltavarepsilon_{a}$) declines with the increase of sPP content, because the related coefficient (g) between PP molecular chains is reduced. The calculated energy $E_{tau}$ for $delta$ process is in proportion to the shallow traps level, because the shallow traps with a higher level increase the potential barriers of carriers hopping behaviors. The increase in temperature causes the dipole to undergo intense Brownian motion in the electric field, resulting in a decrease in $Deltavarepsilon_{a}$ with increasing temperature. The thermal motion of the charge increases the mobility of carriers in the PP and causes $Deltavarepsilon_{delta}$ to increasewith increasingtemperature.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"43 1","pages":"431-434"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86911218","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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