Pub Date : 2010-11-18DOI: 10.1109/ICHVE.2010.5640740
Jianlin Hu, Xingliang Jiang, Caixin Sun, Mingying Chen, Zhijin Zhang, L. Shu
In this paper, the DC flashover characteristics of iced insulator strings were explored in the multi-functional artificial climate chamber through four methods, namely, the average flashover voltage method, the minimum flashover voltage method, the maximum withstand method and the 50% withstand method, with the typical DC porcelain insulator strings and composite insulators. The results indicated that the average flashover voltage and the minimum flashover voltage obtained respectively by the average flashover voltage method and the minimum flashover voltage method were in normal distribution; the 50% flashover voltages gained by the two test methods mentioned above were about 8.0%~9.8% and 3.8%~5.9% higher than that gained by the 50% withstand method respectively, which justified the feasibility of employing the U-curve method and the average flashover voltage method to study the flashover characteristics of iced insulators and their affecting factors.
{"title":"A comparative study on DC flashover characteristics of iced insulators with various electrial test methods","authors":"Jianlin Hu, Xingliang Jiang, Caixin Sun, Mingying Chen, Zhijin Zhang, L. Shu","doi":"10.1109/ICHVE.2010.5640740","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640740","url":null,"abstract":"In this paper, the DC flashover characteristics of iced insulator strings were explored in the multi-functional artificial climate chamber through four methods, namely, the average flashover voltage method, the minimum flashover voltage method, the maximum withstand method and the 50% withstand method, with the typical DC porcelain insulator strings and composite insulators. The results indicated that the average flashover voltage and the minimum flashover voltage obtained respectively by the average flashover voltage method and the minimum flashover voltage method were in normal distribution; the 50% flashover voltages gained by the two test methods mentioned above were about 8.0%~9.8% and 3.8%~5.9% higher than that gained by the 50% withstand method respectively, which justified the feasibility of employing the U-curve method and the average flashover voltage method to study the flashover characteristics of iced insulators and their affecting factors.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"392 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116667908","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640833
K. Prabakar, G. Karady
All Dielectric Self-Supporting (ADSS) cables are installed along with transmission line for the purpose of communication. During installation the outer layer of the cable is hydrophobic and is not prone to dry band arcing. But, these cables becomes less hydrophobic over time and therefore vulnerable to dry band arcing. This loss in hydrophobicity occurs because of the contamination formed on the outer layer due to pollution. This is one of the reasons for cable failure. Considerable amount of losses will be incurred on the occurrence of a cable failure as these cables are leased to other companies. In this paper typical models are shown and their corresponding voltage distribution and current distribution are calculated. This could be used to predict dry band arcing on the models. The method used considers sag, span and pollution on the ADSS cable.
{"title":"Design of an All-Dielectric Self-Supporting cable System","authors":"K. Prabakar, G. Karady","doi":"10.1109/ICHVE.2010.5640833","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640833","url":null,"abstract":"All Dielectric Self-Supporting (ADSS) cables are installed along with transmission line for the purpose of communication. During installation the outer layer of the cable is hydrophobic and is not prone to dry band arcing. But, these cables becomes less hydrophobic over time and therefore vulnerable to dry band arcing. This loss in hydrophobicity occurs because of the contamination formed on the outer layer due to pollution. This is one of the reasons for cable failure. Considerable amount of losses will be incurred on the occurrence of a cable failure as these cables are leased to other companies. In this paper typical models are shown and their corresponding voltage distribution and current distribution are calculated. This could be used to predict dry band arcing on the models. The method used considers sag, span and pollution on the ADSS cable.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127479458","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640867
W. McDermid
Since the 1970s Manitoba Hydro has performed 60 Hz withstand tests together with partial discharge measurements on new and salvaged bushings and current transformers rated ≤115 kV using facilities at our service centre. Similar equipment rated 230 kV, 550 kVac and 500 kVdc has been tested only under special circumstances, and as a result has experienced a higher failure rate in service. A high voltage test facility is currently under construction in Winnipeg that has been designed for full dielectric testing of equipment rated up to 550 kVac and 500 kVdc. The original intent was for testing of instrument transformers, bushings and aerial devices. The scope has been expanded to include power transformers because the avoided costs of associated forced outages are substantial.
{"title":"Rationale for a high voltage test facility","authors":"W. McDermid","doi":"10.1109/ICHVE.2010.5640867","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640867","url":null,"abstract":"Since the 1970s Manitoba Hydro has performed 60 Hz withstand tests together with partial discharge measurements on new and salvaged bushings and current transformers rated ≤115 kV using facilities at our service centre. Similar equipment rated 230 kV, 550 kVac and 500 kVdc has been tested only under special circumstances, and as a result has experienced a higher failure rate in service. A high voltage test facility is currently under construction in Winnipeg that has been designed for full dielectric testing of equipment rated up to 550 kVac and 500 kVdc. The original intent was for testing of instrument transformers, bushings and aerial devices. The scope has been expanded to include power transformers because the avoided costs of associated forced outages are substantial.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123286793","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640752
H. Martins, L. T. B. Santos
This paper presents the development of a device capable of generating very fast transient signals typically found in SF6 Gas Insulated Substations (GIS), originated from disconnector switchings or the occurrence of disruptive discharge to ground. Substations where power transformers are coupled to GIS, such signals are presented as a potential source of failure as a function of dielectric request imposed. This device is basically a variable "gap" made of special spheres, inserted in a pressurized SF6 compartment between a SF6/Air passing bushing and a 6power transformer. Using this set-up, triggered by self discharge, associated an adequate procedure; it is possible to test the supportability of bushings and transformers to dielectric requests of steep and fast front waves.
{"title":"A set-up to apply very-fast transients in power transformers","authors":"H. Martins, L. T. B. Santos","doi":"10.1109/ICHVE.2010.5640752","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640752","url":null,"abstract":"This paper presents the development of a device capable of generating very fast transient signals typically found in SF6 Gas Insulated Substations (GIS), originated from disconnector switchings or the occurrence of disruptive discharge to ground. Substations where power transformers are coupled to GIS, such signals are presented as a potential source of failure as a function of dielectric request imposed. This device is basically a variable \"gap\" made of special spheres, inserted in a pressurized SF6 compartment between a SF6/Air passing bushing and a 6power transformer. Using this set-up, triggered by self discharge, associated an adequate procedure; it is possible to test the supportability of bushings and transformers to dielectric requests of steep and fast front waves.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126735824","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640769
Alapati Sridhar, M. Joy Thomas
Treeing in polyethylene based nanocomposite samples as well as unfilled polyethylene samples were studied using 50Hz ac voltage. The tree inception voltage was observed for different types of samples. The tree initiation time as well as the tree growth patterns at a fixed ac voltage have also been studied. The results show that there is an improvement in tree inception voltage with nano filler loading in polyethylene. Different tree growth patterns for both the unfilled polyethylene and the polyethylene nanocomposites have been observed. A slower tree growth was observed in polyethylene nanocomposites. The partial discharge characteristics of unfilled and nano filled polyethylene samples during the electrical tree growth period was also studied. Decrease in PD magnitude as well as in the number of pd pulses with electrical tree growth duration in polyethylene nanocomposites has also been observed. The possible reasons for the improvement in electrical tree growth and PD resistance with the addition of nano fillers are discussed.
{"title":"Electrical treeing in polyethylene: effect of nano fillers on tree inception and growth","authors":"Alapati Sridhar, M. Joy Thomas","doi":"10.1109/ICHVE.2010.5640769","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640769","url":null,"abstract":"Treeing in polyethylene based nanocomposite samples as well as unfilled polyethylene samples were studied using 50Hz ac voltage. The tree inception voltage was observed for different types of samples. The tree initiation time as well as the tree growth patterns at a fixed ac voltage have also been studied. The results show that there is an improvement in tree inception voltage with nano filler loading in polyethylene. Different tree growth patterns for both the unfilled polyethylene and the polyethylene nanocomposites have been observed. A slower tree growth was observed in polyethylene nanocomposites. The partial discharge characteristics of unfilled and nano filled polyethylene samples during the electrical tree growth period was also studied. Decrease in PD magnitude as well as in the number of pd pulses with electrical tree growth duration in polyethylene nanocomposites has also been observed. The possible reasons for the improvement in electrical tree growth and PD resistance with the addition of nano fillers are discussed.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114903437","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640732
P. Dixit, V. Krishnan, G. Nagabhushana
In power systems, ceramic insulators have been used over a very long period as outdoor insulation. However, in recent decades polymeric insulators are finding increasing applications, particularly at the higher system voltages due to their superior performance under polluted conditions and light weight. This paper describes the development of a theoretical model to predict DC flashover voltages of polluted polymeric insulators. The model has been verified with the published experimental results and agreement is found to be within about 10%.
{"title":"Mathematical model to predict flashover voltages of polluted polymeric insulators intended for UHV DC","authors":"P. Dixit, V. Krishnan, G. Nagabhushana","doi":"10.1109/ICHVE.2010.5640732","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640732","url":null,"abstract":"In power systems, ceramic insulators have been used over a very long period as outdoor insulation. However, in recent decades polymeric insulators are finding increasing applications, particularly at the higher system voltages due to their superior performance under polluted conditions and light weight. This paper describes the development of a theoretical model to predict DC flashover voltages of polluted polymeric insulators. The model has been verified with the published experimental results and agreement is found to be within about 10%.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"42 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115015182","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640860
Jing Wang, W. Sima, Qing Yang, T. Yuan
This paper introduces the Hilbert-Huang transform method which is composed of Empirical Mode Decomposition (EMD) and Hilbert Transform. Seven kinds of common power system over-voltages are analyzed by HHT, results show that the instantaneous amplitude spectrum, Hilbert marginal spectrum, Hilbert time-frequency spectrum can be used as characteristic parameters for different types of over-voltage classification and identification. A hierarchical recognition system is built based on HHT and SVM, and the system is tested by field over-voltage signals. The results show that this system is effective to classify and recognize the over-voltage signal with a high recognition rate.
{"title":"Classification and identification of over-voltage based on HHT and SVM","authors":"Jing Wang, W. Sima, Qing Yang, T. Yuan","doi":"10.1109/ICHVE.2010.5640860","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640860","url":null,"abstract":"This paper introduces the Hilbert-Huang transform method which is composed of Empirical Mode Decomposition (EMD) and Hilbert Transform. Seven kinds of common power system over-voltages are analyzed by HHT, results show that the instantaneous amplitude spectrum, Hilbert marginal spectrum, Hilbert time-frequency spectrum can be used as characteristic parameters for different types of over-voltage classification and identification. A hierarchical recognition system is built based on HHT and SVM, and the system is tested by field over-voltage signals. The results show that this system is effective to classify and recognize the over-voltage signal with a high recognition rate.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122936488","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640710
W. Gil, W. Grzybowski, Przemysław Wronek
We describe the reasons to design and apply advanced expert “on-line” systems to extend the typical power transformer supervision. A new specialized devices are introduced to enhance supervising ability. We demonstrate that the usage of efficient network communication simplifies their application, integration with existing systems, maintenance and service. We present a list of messages, warnings and alarms which was created to inform directly and quickly about dangers and expanding incorrect processes. Our experience allows to base the opinion, that the expert monitoring efficiency and usefulness depend on the connection to the existing station dispatch systems and remote supervising centers.
{"title":"The expert transformer monitoring system in substation structure","authors":"W. Gil, W. Grzybowski, Przemysław Wronek","doi":"10.1109/ICHVE.2010.5640710","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640710","url":null,"abstract":"We describe the reasons to design and apply advanced expert “on-line” systems to extend the typical power transformer supervision. A new specialized devices are introduced to enhance supervising ability. We demonstrate that the usage of efficient network communication simplifies their application, integration with existing systems, maintenance and service. We present a list of messages, warnings and alarms which was created to inform directly and quickly about dangers and expanding incorrect processes. Our experience allows to base the opinion, that the expert monitoring efficiency and usefulness depend on the connection to the existing station dispatch systems and remote supervising centers.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114300501","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640869
S. Mallick, A. Nag, V. Rakov
In this paper, we describe the two-station measurements of triggered-lightning electromagnetic fields performed by the University of Florida Lightning Research Group in 2008–2009. Lightning is triggered at Camp Blanding, Florida, where near-field signals were recorded. Far-field signals were recorded at the Lightning Observatory in Gainesville, located about 45 km away from Camp Blanding.
{"title":"Measurements of radiation field signatures of rocket-triggered lightning","authors":"S. Mallick, A. Nag, V. Rakov","doi":"10.1109/ICHVE.2010.5640869","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640869","url":null,"abstract":"In this paper, we describe the two-station measurements of triggered-lightning electromagnetic fields performed by the University of Florida Lightning Research Group in 2008–2009. Lightning is triggered at Camp Blanding, Florida, where near-field signals were recorded. Far-field signals were recorded at the Lightning Observatory in Gainesville, located about 45 km away from Camp Blanding.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114610610","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 : 2010-11-18DOI: 10.1109/ICHVE.2010.5640786
Tao Chang, Xiaoxing Zhang, Wangting Liu, Caixin Sun
The detection and analysis of dissolved gases in oil is an important means to determine the early latent faults of oil-immersed power transformer. A dissolved gases in oil detection method is presented based on carbon nanotubes sensor. A kind of MWNTs (Multi-wall carbon nanotubes) gas sensor modified by mixed acid was developed based on printed circuit board to detect dissolved gases in oil. The electrical properties and gas sensing response mechanism of carbon nanotubes (CNTs) was analyzed. The gas sensing response for dissolved gases in oil was tested using the MWNTs sensor in the laboratory. Test results showed that, the developed MWNTs sensor has more defects, contains activity functional groups and with strong absorption capacity for dissolved gases in oil, which exhibits good sensitivity and fast response characteristics.
{"title":"Detecting oil dissolved gases using carbon nanotubes sensor","authors":"Tao Chang, Xiaoxing Zhang, Wangting Liu, Caixin Sun","doi":"10.1109/ICHVE.2010.5640786","DOIUrl":"https://doi.org/10.1109/ICHVE.2010.5640786","url":null,"abstract":"The detection and analysis of dissolved gases in oil is an important means to determine the early latent faults of oil-immersed power transformer. A dissolved gases in oil detection method is presented based on carbon nanotubes sensor. A kind of MWNTs (Multi-wall carbon nanotubes) gas sensor modified by mixed acid was developed based on printed circuit board to detect dissolved gases in oil. The electrical properties and gas sensing response mechanism of carbon nanotubes (CNTs) was analyzed. The gas sensing response for dissolved gases in oil was tested using the MWNTs sensor in the laboratory. Test results showed that, the developed MWNTs sensor has more defects, contains activity functional groups and with strong absorption capacity for dissolved gases in oil, which exhibits good sensitivity and fast response characteristics.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129264596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：