Pub Date : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705464
H. Wilhelm, P. Fernandes, L. Dill, K. Moscon, C. Steffens, S. Peres, V. Bender, T. Marchesan, J. B. Ferreira Neto
Transformers at nominal operating temperatures present low risk of bubble formation in mineral oil-paper insulating systems. However, in the case of overload with meaning temperature increase, bubble formation risk significantly increases. That is of concern since it can increase partial discharge risk, alter oil dielectric strength and increase insulation thermal degradation around the bubble. Therefore, this study aims to assess dynamics of bubble formation under sudden temperature changes, in an experimental model comprised of mineral insulating oil and thermally upgraded kraft paper. Results show that bubble inception temperature is dependent on paper water content. Water content values above 1% in insulating paper favored bubble formation. Temperature of bubble inception decreased as water content increased, being 55 °C at 2.5% of water and 120 °C at 0.3% of water. Interestingly, abrupt changes in temperature caused bubble appearance in mineral oil-paper insulation system, regardless of paper water content.
{"title":"Study of Bubbles Evolution in Mineral Oil-paper Insulating System under Sudden Changes in Temperature","authors":"H. Wilhelm, P. Fernandes, L. Dill, K. Moscon, C. Steffens, S. Peres, V. Bender, T. Marchesan, J. B. Ferreira Neto","doi":"10.1109/CEIDP50766.2021.9705464","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705464","url":null,"abstract":"Transformers at nominal operating temperatures present low risk of bubble formation in mineral oil-paper insulating systems. However, in the case of overload with meaning temperature increase, bubble formation risk significantly increases. That is of concern since it can increase partial discharge risk, alter oil dielectric strength and increase insulation thermal degradation around the bubble. Therefore, this study aims to assess dynamics of bubble formation under sudden temperature changes, in an experimental model comprised of mineral insulating oil and thermally upgraded kraft paper. Results show that bubble inception temperature is dependent on paper water content. Water content values above 1% in insulating paper favored bubble formation. Temperature of bubble inception decreased as water content increased, being 55 °C at 2.5% of water and 120 °C at 0.3% of water. Interestingly, abrupt changes in temperature caused bubble appearance in mineral oil-paper insulation system, regardless of paper water content.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"60 1","pages":"547-550"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73892580","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705371
Kosuke Sato, N. Hashimoto, H. Miyake, Yasuhiro Tanaka
In this paper, the leakage current and charge accumulation characteristics of epoxy resin at high temperature under high electric stress were investigated. Generally, ceramic materials are used for the insulating substrate of power modules, but they are being replaced by epoxy resin-based substrates to reduce cost and to improve a heat cycle resistance. In polymeric insulating materials such as epoxy resin, dielectric breakdown occurs due to increased leakage current and distortion of the internal electric field caused by the space charge accumulation when high DC voltage is applied for a long time at high temperature. Therefore, it is important to understand the leakage current characteristics and the space charge accumulation characteristics of insulating materials at high temperature under high electric field. In this study, the leakage current and the charge accumulation of two types of epoxy resins made with different curing agents were evaluated using a direct current integrated charge method (DCIC-Q(t)) at high temperature under high electric field. The results show epoxy resin with acid anhydride curing agents (EP-NH) has a better insulating performance than that with amine-based curing agents (EP-A).
{"title":"Evaluation of Leak Current and Charge Accumulation in Epoxy Resin at High Temperature Under High DC Stress","authors":"Kosuke Sato, N. Hashimoto, H. Miyake, Yasuhiro Tanaka","doi":"10.1109/CEIDP50766.2021.9705371","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705371","url":null,"abstract":"In this paper, the leakage current and charge accumulation characteristics of epoxy resin at high temperature under high electric stress were investigated. Generally, ceramic materials are used for the insulating substrate of power modules, but they are being replaced by epoxy resin-based substrates to reduce cost and to improve a heat cycle resistance. In polymeric insulating materials such as epoxy resin, dielectric breakdown occurs due to increased leakage current and distortion of the internal electric field caused by the space charge accumulation when high DC voltage is applied for a long time at high temperature. Therefore, it is important to understand the leakage current characteristics and the space charge accumulation characteristics of insulating materials at high temperature under high electric field. In this study, the leakage current and the charge accumulation of two types of epoxy resins made with different curing agents were evaluated using a direct current integrated charge method (DCIC-Q(t)) at high temperature under high electric field. The results show epoxy resin with acid anhydride curing agents (EP-NH) has a better insulating performance than that with amine-based curing agents (EP-A).","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"67 1","pages":"81-84"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74803329","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705327
Qinghua Han, I. Iddrissu, Lujia Chen, S. Rowland
Electrical trees initiated from defects in solid insulation are one of the main causes of cable insulation failure. Both the initiation and propagation of electrical trees are linked to PD activity in the free volume and interfaces between electrode, gaseous and solid dielectrics. This work investigates the potential of suppressing partial discharge (PD) during tree propagation by displacing air with a higher electron affinity gas. Epoxy resin samples with pre-existing trees were energized under 7 kVrms in atmospheric air and SF6 under 2 bar absolute for 3 hours. PD measurements indicate that the permeation of SF6 into the epoxy sample could significantly reduce the discharge energy and lead to a reduced number of discharges. However, the tree length growth was comparable for both gases. This is attributed to offsetting of reduced PD energy by SF6 within the tree channels and subsequent reaction between gas by-products and the epoxy.
{"title":"Effect of Insulating Gases on Electrical Treeing in Epoxy Resin","authors":"Qinghua Han, I. Iddrissu, Lujia Chen, S. Rowland","doi":"10.1109/CEIDP50766.2021.9705327","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705327","url":null,"abstract":"Electrical trees initiated from defects in solid insulation are one of the main causes of cable insulation failure. Both the initiation and propagation of electrical trees are linked to PD activity in the free volume and interfaces between electrode, gaseous and solid dielectrics. This work investigates the potential of suppressing partial discharge (PD) during tree propagation by displacing air with a higher electron affinity gas. Epoxy resin samples with pre-existing trees were energized under 7 kVrms in atmospheric air and SF6 under 2 bar absolute for 3 hours. PD measurements indicate that the permeation of SF6 into the epoxy sample could significantly reduce the discharge energy and lead to a reduced number of discharges. However, the tree length growth was comparable for both gases. This is attributed to offsetting of reduced PD energy by SF6 within the tree channels and subsequent reaction between gas by-products and the epoxy.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"31 1","pages":"482-485"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77863297","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705326
Bo Zhang, Jiang Wu, Xiaoquan Zheng
Polyimide is a commonly used polymer dielectric material on spacecraft. The vacuum and radiation environment can easily lead to the accumulation of static charge on the spacecraft and trigger the surface discharge. Therefore, improving the surface DC flashover voltage of the dielectric in the space environment is crucial to improve the reliability of the spacecraft. In this paper, ZnO/PI nanocomposite was prepared to improve the flashover voltage. The electrical performance test including the relative permittivity, surface and bulk resistivity of the specimen was tested. The thermally stimulated depolarizing current method was used to analyze the trap parameters. The results show that the flashover voltage of PI is enhanced by nano ZnO, among which the flashover voltage increases the most at 3wt% ZnO content. Further analysis shows that the surface flashover intensity depends on the trap density, conductivity and methods of charge transportation and accumulation. The higher the trap density and higher electrical conductivity in the ohmic region, the lower the charge accumulated and the higher the flashover.
{"title":"Charge Transport Characteristics of ZnO/Polyimide Nanocomposite Under Vacuum DC flashover","authors":"Bo Zhang, Jiang Wu, Xiaoquan Zheng","doi":"10.1109/CEIDP50766.2021.9705326","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705326","url":null,"abstract":"Polyimide is a commonly used polymer dielectric material on spacecraft. The vacuum and radiation environment can easily lead to the accumulation of static charge on the spacecraft and trigger the surface discharge. Therefore, improving the surface DC flashover voltage of the dielectric in the space environment is crucial to improve the reliability of the spacecraft. In this paper, ZnO/PI nanocomposite was prepared to improve the flashover voltage. The electrical performance test including the relative permittivity, surface and bulk resistivity of the specimen was tested. The thermally stimulated depolarizing current method was used to analyze the trap parameters. The results show that the flashover voltage of PI is enhanced by nano ZnO, among which the flashover voltage increases the most at 3wt% ZnO content. Further analysis shows that the surface flashover intensity depends on the trap density, conductivity and methods of charge transportation and accumulation. The higher the trap density and higher electrical conductivity in the ohmic region, the lower the charge accumulated and the higher the flashover.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"29 12 1","pages":"446-449"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78172545","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705423
T. Linde, K. Backhaus, Rolf Terzan, Stephan Schlegel
Harmonic distorted voltage waveforms can lead to excessive heat in the insulation of electrical equipment. The prospectively increasing number of power electronic devices in electrical grids requires the careful examination of the consequences of harmonics, which are introduced due to the operating principle of the semiconductor switches. Investigations of the thermal breakdown of solid dielectrics that may occur as a consequence of harmonic distortion on the voltage waveform of electrical grids are presented in this contribution. A thermo-electrical multi-frequency model allows the calculation of the overtemperature in the material. The calculations are confirmed by breakdown experiments of phenolic paper and epoxy resin. Generally, the additional dielectric losses due to the harmonic voltage distortion increase the possibility of exceeding the thermal equilibrium. However, modern insulation materials like the investigated epoxy resin have very low loss factors which is favourable for good thermal performance even with severely distorted voltages.
{"title":"Dielectric Heating of Polymers as a Consequence of High Harmonic Voltage Distortion","authors":"T. Linde, K. Backhaus, Rolf Terzan, Stephan Schlegel","doi":"10.1109/CEIDP50766.2021.9705423","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705423","url":null,"abstract":"Harmonic distorted voltage waveforms can lead to excessive heat in the insulation of electrical equipment. The prospectively increasing number of power electronic devices in electrical grids requires the careful examination of the consequences of harmonics, which are introduced due to the operating principle of the semiconductor switches. Investigations of the thermal breakdown of solid dielectrics that may occur as a consequence of harmonic distortion on the voltage waveform of electrical grids are presented in this contribution. A thermo-electrical multi-frequency model allows the calculation of the overtemperature in the material. The calculations are confirmed by breakdown experiments of phenolic paper and epoxy resin. Generally, the additional dielectric losses due to the harmonic voltage distortion increase the possibility of exceeding the thermal equilibrium. However, modern insulation materials like the investigated epoxy resin have very low loss factors which is favourable for good thermal performance even with severely distorted voltages.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"223 1","pages":"5-8"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82162574","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705388
A. Mezouar, V. Griseri, N. Saidi-Amroun, G. Teyssèdre, M. Saidi
In this work, we focus our attention on data obtained from Pulse Electro Acoustic (PEA) measurements on PTFE films before and after irradiation with a 60Co gamma radiation source. At first, samples are just polarized to determine the effect of the gamma irradiation on the charge transport in the bulk. In a second stage, these films have been exposed to a mono-energetic electron beam. The aim is to study the effect of gamma radiation on charge storage in the bulk. Keywords- Gamma-irradiation, Polytetrafluoroethylene, Electron beam irradiation.
{"title":"Effect of Gamma Radiation on Charge Storage in PTFE Exposed to Electron Beam","authors":"A. Mezouar, V. Griseri, N. Saidi-Amroun, G. Teyssèdre, M. Saidi","doi":"10.1109/CEIDP50766.2021.9705388","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705388","url":null,"abstract":"In this work, we focus our attention on data obtained from Pulse Electro Acoustic (PEA) measurements on PTFE films before and after irradiation with a 60Co gamma radiation source. At first, samples are just polarized to determine the effect of the gamma irradiation on the charge transport in the bulk. In a second stage, these films have been exposed to a mono-energetic electron beam. The aim is to study the effect of gamma radiation on charge storage in the bulk. Keywords- Gamma-irradiation, Polytetrafluoroethylene, Electron beam irradiation.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"60 1","pages":"367-370"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81347967","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705356
Kazuki Endo, Daiki Fukuhara, Kaisei Enoki, H. Miyake, Yasuhiro Tanaka
The pulsed electroacoustic (PEA) method could not evaluate the polarization charge and the true charge separately due to the positional resolution of the measurement system. In this study, we attempt to distinguish them by applying the voltage through the vacuum gap. We used various polymer insulating materials with different relative permittivity as a sample to clarify the relationship between relative permittivity and the amount of the polarization charge. The results show that the charge signal reflecting the polarization charge was observed at sample-vacuum interface, and the output signal intensity increased with the increase of the applied electric field and relative permittivity.
{"title":"The Polarization Charge Observation in Dielectric Material Using PEA Method","authors":"Kazuki Endo, Daiki Fukuhara, Kaisei Enoki, H. Miyake, Yasuhiro Tanaka","doi":"10.1109/CEIDP50766.2021.9705356","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705356","url":null,"abstract":"The pulsed electroacoustic (PEA) method could not evaluate the polarization charge and the true charge separately due to the positional resolution of the measurement system. In this study, we attempt to distinguish them by applying the voltage through the vacuum gap. We used various polymer insulating materials with different relative permittivity as a sample to clarify the relationship between relative permittivity and the amount of the polarization charge. The results show that the charge signal reflecting the polarization charge was observed at sample-vacuum interface, and the output signal intensity increased with the increase of the applied electric field and relative permittivity.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"70 1","pages":"462-465"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82720938","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705406
A. Cremasco, M. Curti, J. van Duivenbode, E. Lomonova, D. Rothmund
The electric field in a liquid-filled insulation system at uniform temperature, subjected to constant dc voltage is investigated. This work emphasizes the importance of charge transport modeling by electro-hydro dynamic (EHD) equations. The EHD model is compared with the quasi-ohmic conduction (qΩ) model, often preferred for the lower computational cost, by analyzing the electric field intensity between two electrodes separated by mineral oil and impregnated paper insulation. First, the EHD model is verified by measurements available from the literature. Next, to compare the models consistently, the apparent conductivities used in the qΩ model are extrapolated by the verified EHD model, as a function of the electric field intensity. A significant deviation of the qΩ model from both the EHD model and the measurements is observed, due to the presence of space charge in the solid insulation.
{"title":"Electric Field Models for Liquid-Filled Insulation of Medium-Voltage AC/DC Distribution Technology","authors":"A. Cremasco, M. Curti, J. van Duivenbode, E. Lomonova, D. Rothmund","doi":"10.1109/CEIDP50766.2021.9705406","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705406","url":null,"abstract":"The electric field in a liquid-filled insulation system at uniform temperature, subjected to constant dc voltage is investigated. This work emphasizes the importance of charge transport modeling by electro-hydro dynamic (EHD) equations. The EHD model is compared with the quasi-ohmic conduction (qΩ) model, often preferred for the lower computational cost, by analyzing the electric field intensity between two electrodes separated by mineral oil and impregnated paper insulation. First, the EHD model is verified by measurements available from the literature. Next, to compare the models consistently, the apparent conductivities used in the qΩ model are extrapolated by the verified EHD model, as a function of the electric field intensity. A significant deviation of the qΩ model from both the EHD model and the measurements is observed, due to the presence of space charge in the solid insulation.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"9 1","pages":"450-453"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89032288","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705369
James Steele, James Schlagenhaft, W. Chatterton
For the past 22 years, cable rejuvenation has played a key role in NV Energy’s (NVE) delivery of reliable electric power to its customer base of over 1.3 million homes and businesses in the United States’ desert southwest. Since the beginning of the program in 1998, more than 12 million conductor feet of their underground residential distribution (URD) system have been successfully rejuvenated by silicone fluid injection. This paper will explore the evolution of NVE’s reliability program from trial phase to the present and the metrics used to gauge the success of silicone fluid injection. Furthermore, the application of predictive modeling as a tool for forecasting future outages and estimating outages saved will be defined.
{"title":"Cable Rejuvenation Changes the Course of History at NV Energy: An In-depth Case Study","authors":"James Steele, James Schlagenhaft, W. Chatterton","doi":"10.1109/CEIDP50766.2021.9705369","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705369","url":null,"abstract":"For the past 22 years, cable rejuvenation has played a key role in NV Energy’s (NVE) delivery of reliable electric power to its customer base of over 1.3 million homes and businesses in the United States’ desert southwest. Since the beginning of the program in 1998, more than 12 million conductor feet of their underground residential distribution (URD) system have been successfully rejuvenated by silicone fluid injection. This paper will explore the evolution of NVE’s reliability program from trial phase to the present and the metrics used to gauge the success of silicone fluid injection. Furthermore, the application of predictive modeling as a tool for forecasting future outages and estimating outages saved will be defined.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"61 1","pages":"27-31"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89323391","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 : 2021-12-12DOI: 10.1109/CEIDP50766.2021.9705468
Weiguo Li, Zhuodong Yang, Hongjian Zhou, C. Gao, Haozhi Shi, B. Qi, Chengrong Li
Surface charge accumulation is one of the most important factors causing surface flashover of gas-insulated metal-enclosed transmission line insulators. Surface charges not only distort the local electric field intensity but also provide charges for creeping discharge, which finally leads to flashover. The tri-post insulator is the most common applied insulator in GIL, and whose insulating properties could make the most significant contributions to maintain the safe and reliable operation of GIL. Aiming at discovering the accumulation characteristics of surface charge on actual GIL tri-post insulator in SF6 under AC voltage, a 3D surface charge measurement device based on electrostatic capacitive probe is developed in this paper, which has a charge resolution of 0.02803pC/(m2•nV) and a space resolution of 3.9mm2. The accumulation characteristics of surface charge under AC voltages with different voltage amplitude and different voltage application times were carried out. The results show that, in the context of AC voltage, there appears with both positive and negative charges accumulating on the surface. With the voltage amplitude increasing and application time prolonging, there are more charge accumulating on the abdomen zone than pillar zone, which could be attributed to the field strength differences in there two zones.
{"title":"The 3D Accumulation Characteristics of Surface Charges on Actual 550 kV GIL Tri-post Insulator under AC Voltage in SF6","authors":"Weiguo Li, Zhuodong Yang, Hongjian Zhou, C. Gao, Haozhi Shi, B. Qi, Chengrong Li","doi":"10.1109/CEIDP50766.2021.9705468","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705468","url":null,"abstract":"Surface charge accumulation is one of the most important factors causing surface flashover of gas-insulated metal-enclosed transmission line insulators. Surface charges not only distort the local electric field intensity but also provide charges for creeping discharge, which finally leads to flashover. The tri-post insulator is the most common applied insulator in GIL, and whose insulating properties could make the most significant contributions to maintain the safe and reliable operation of GIL. Aiming at discovering the accumulation characteristics of surface charge on actual GIL tri-post insulator in SF6 under AC voltage, a 3D surface charge measurement device based on electrostatic capacitive probe is developed in this paper, which has a charge resolution of 0.02803pC/(m2•nV) and a space resolution of 3.9mm2. The accumulation characteristics of surface charge under AC voltages with different voltage amplitude and different voltage application times were carried out. The results show that, in the context of AC voltage, there appears with both positive and negative charges accumulating on the surface. With the voltage amplitude increasing and application time prolonging, there are more charge accumulating on the abdomen zone than pillar zone, which could be attributed to the field strength differences in there two zones.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"11 1","pages":"359-362"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78292189","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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