Pub Date : 2014-08-01DOI: 10.1109/ICACACT.2014.7223616
V. Catterson, B. Sheng
Artificial neural networks have been investigated for many years as a technique for automated diagnosis of defects causing partial discharge (PD). While good levels of accuracy have been reported, disadvantages include the difficulty of explaining results, and the need to hand-craft appropriate features for standard two-layer networks. Recent advances in the design and training of deep neural networks, which contain more than two layers of hidden neurons, have resulted in improved results in speech and image recognition tasks. This paper investigates the use of deep neural networks for PD diagnosis. Defect samples constructed in mineral oil were used to generate data for training and testing. The paper demonstrates the improvements in accuracy and visualization of learning which can be gained from deep learning.
{"title":"Deep neural networks for understanding and diagnosing partial discharge data","authors":"V. Catterson, B. Sheng","doi":"10.1109/ICACACT.2014.7223616","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223616","url":null,"abstract":"Artificial neural networks have been investigated for many years as a technique for automated diagnosis of defects causing partial discharge (PD). While good levels of accuracy have been reported, disadvantages include the difficulty of explaining results, and the need to hand-craft appropriate features for standard two-layer networks. Recent advances in the design and training of deep neural networks, which contain more than two layers of hidden neurons, have resulted in improved results in speech and image recognition tasks. This paper investigates the use of deep neural networks for PD diagnosis. Defect samples constructed in mineral oil were used to generate data for training and testing. The paper demonstrates the improvements in accuracy and visualization of learning which can be gained from deep learning.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126409050","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223592
Chenxing Wang, Xuezhong Liu, Xianrong Wang, Ning Liu, Xiuying Jiao, Y. Tan
Inorganic sediments frequently deposit on the pin-type grading electrodes installed in the inner cooling circuits for high voltage converter valves. This investigation focuses on the distributing characteristics of deposited sediments. Field data have been collected from three ±500kV converter stations. Sediment distributions corresponding to different valve tower structures are summarized. The relationships between sediment thickness and electrode locations in both horizontal and vertical components of converter valve are analyzed. The chemical compositions of field-collected sediment samples are analyzed by means of energy dispersive spectrometer (EDS). Electrical insulating properties of the samples are measured. The results indicate that the deposition degree of the sediment is mainly dominated by the electrical current through the pin-type grading electrode. The electronegative sediment particles tend to deposit on the grading electrodes with positive polarity. The deposited sediment is mainly composed of aluminum oxide compounds and may impact the uniform effect of the grading electrode.
{"title":"The distributing characteristics of sediment deposited on pin-type grading electrodes in inner cooling circuit of HV converter valve","authors":"Chenxing Wang, Xuezhong Liu, Xianrong Wang, Ning Liu, Xiuying Jiao, Y. Tan","doi":"10.1109/ICACACT.2014.7223592","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223592","url":null,"abstract":"Inorganic sediments frequently deposit on the pin-type grading electrodes installed in the inner cooling circuits for high voltage converter valves. This investigation focuses on the distributing characteristics of deposited sediments. Field data have been collected from three ±500kV converter stations. Sediment distributions corresponding to different valve tower structures are summarized. The relationships between sediment thickness and electrode locations in both horizontal and vertical components of converter valve are analyzed. The chemical compositions of field-collected sediment samples are analyzed by means of energy dispersive spectrometer (EDS). Electrical insulating properties of the samples are measured. The results indicate that the deposition degree of the sediment is mainly dominated by the electrical current through the pin-type grading electrode. The electronegative sediment particles tend to deposit on the grading electrodes with positive polarity. The deposited sediment is mainly composed of aluminum oxide compounds and may impact the uniform effect of the grading electrode.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132403929","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223511
S. Wu, R. Chippendale, P. Lewin, J. Hemrle, L. Kaufmann
This paper investigates the electric potential and field of a two phase (gas-liquid) system. The study uses finite element analysis (FEA) techniques to investigate the impact of a gas bubble on the bulk electric field. The FEA model is expanded to consider the multiple bubble breakdown probability using Monte Carlo techniques. The numerical results demonstrate that compared with bubble quantity, bubble radius is the dominant factor for two phase system electrical breakdown. Furthermore, the effective breakdown strength of a two phase system has been determined as a function of gas phase volume fraction. The predicted two phase effective breakdown strength has then been compared against the mixture rule, where good agreement was achieved.
{"title":"Numerical study into the breakdown strength of a two phase (gas-liquid) insulation system","authors":"S. Wu, R. Chippendale, P. Lewin, J. Hemrle, L. Kaufmann","doi":"10.1109/ICACACT.2014.7223511","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223511","url":null,"abstract":"This paper investigates the electric potential and field of a two phase (gas-liquid) system. The study uses finite element analysis (FEA) techniques to investigate the impact of a gas bubble on the bulk electric field. The FEA model is expanded to consider the multiple bubble breakdown probability using Monte Carlo techniques. The numerical results demonstrate that compared with bubble quantity, bubble radius is the dominant factor for two phase system electrical breakdown. Furthermore, the effective breakdown strength of a two phase system has been determined as a function of gas phase volume fraction. The predicted two phase effective breakdown strength has then been compared against the mixture rule, where good agreement was achieved.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"1 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132407995","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223536
T. Nakamura, A. Kumada, H. Ikeda, K. Hidaka, S. Boggs, Y. Tsuboi, T. Yoshimitsu
In this paper, the influence of lower-frequency voltage components in PWM voltage on the performance of stress grading system of motor insulation is investigated by observing the light emission of partial discharge and by measuring potential distribution under 2- and 3-level PWM and sinusoidal ac voltages. Computations by finite element method are conducted to determine electrical field on coil surface. According to the results, the potential gradient under PWM voltage is largest during the first pulse after polarity reversal, as space charge of reversed polarity accumulates at the interface between corona armor tape (CAT) and stress grading tape (SGT) due to a fundamental frequency component in PWM voltage. Therefore, the intensity of light emission during the first pulse is the largest. From the computed results, it has become cleared the maximum field at the interface between the CAT and the SGT becomes higher under PWM voltage than that under rectangular ac voltage whose jump voltage is the same due to such charge accumulation.
{"title":"Transient potential measurement on stress grading under multi-level PWM","authors":"T. Nakamura, A. Kumada, H. Ikeda, K. Hidaka, S. Boggs, Y. Tsuboi, T. Yoshimitsu","doi":"10.1109/ICACACT.2014.7223536","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223536","url":null,"abstract":"In this paper, the influence of lower-frequency voltage components in PWM voltage on the performance of stress grading system of motor insulation is investigated by observing the light emission of partial discharge and by measuring potential distribution under 2- and 3-level PWM and sinusoidal ac voltages. Computations by finite element method are conducted to determine electrical field on coil surface. According to the results, the potential gradient under PWM voltage is largest during the first pulse after polarity reversal, as space charge of reversed polarity accumulates at the interface between corona armor tape (CAT) and stress grading tape (SGT) due to a fundamental frequency component in PWM voltage. Therefore, the intensity of light emission during the first pulse is the largest. From the computed results, it has become cleared the maximum field at the interface between the CAT and the SGT becomes higher under PWM voltage than that under rectangular ac voltage whose jump voltage is the same due to such charge accumulation.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133978247","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223480
Y. Huang, Yanan Cai, Youyuan Wang, Hang Liu
The distribution transformer plays a key role in distribution network. It undertakes the task of the voltage transformation, energy distribution. But a lot of loss of the transformer in operation has affected the economy of the distribution network. Therefore in order to save energy, it is essential to consider the transformer economical operation mode during distribution network load distribution. Combining with the comprehensive power loss curve and critical load of transformer in parallel, the interval of economic operation of transformers in different operation modes is deduced in this paper. Then the unavailability of transformers in different operation mode is calculated. The distribution network load distribution model is proposed which takes distribution network reliability, the economy of parallel transformers and load balancing as the object function. The topological structure, load capacity and operating limits are given as the restriction conditions. Using optimization algorithm to analyze the model, the appropriate transformer operation mode and the load distribution scheme can be determined. What's more, a simple double power distribution network is used to show the steps of the distribution network load distribution considering the transformer economic operation mode. It makes clear that the model can determine the transformer operation mode and the load distribution strategy. The optimization results contribute to improving the distribution network reliability and economy.
{"title":"Distribution network load distribution strategy considering the economy of parallel transformers","authors":"Y. Huang, Yanan Cai, Youyuan Wang, Hang Liu","doi":"10.1109/ICACACT.2014.7223480","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223480","url":null,"abstract":"The distribution transformer plays a key role in distribution network. It undertakes the task of the voltage transformation, energy distribution. But a lot of loss of the transformer in operation has affected the economy of the distribution network. Therefore in order to save energy, it is essential to consider the transformer economical operation mode during distribution network load distribution. Combining with the comprehensive power loss curve and critical load of transformer in parallel, the interval of economic operation of transformers in different operation modes is deduced in this paper. Then the unavailability of transformers in different operation mode is calculated. The distribution network load distribution model is proposed which takes distribution network reliability, the economy of parallel transformers and load balancing as the object function. The topological structure, load capacity and operating limits are given as the restriction conditions. Using optimization algorithm to analyze the model, the appropriate transformer operation mode and the load distribution scheme can be determined. What's more, a simple double power distribution network is used to show the steps of the distribution network load distribution considering the transformer economic operation mode. It makes clear that the model can determine the transformer operation mode and the load distribution strategy. The optimization results contribute to improving the distribution network reliability and economy.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131647948","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223537
D. McKinnon, H. Penrose, N. Frost
Over the last century as electrical motor testing became more prevalent in industry, little research has been published on computer simulations insulation systems of motor circuits. In this paper, we will present summary results of simulating insulation systems of motors and their associated cabling systems (i.e. the motor circuit). Summary results of the difference in measurements performed on isolated cables and motors as well as when they are connected will be presented. We will also discuss how the standard insulation model may be applied to all types of insulation systems including cables, transformers, etc.
{"title":"Insulation system modeling of motor circuits","authors":"D. McKinnon, H. Penrose, N. Frost","doi":"10.1109/ICACACT.2014.7223537","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223537","url":null,"abstract":"Over the last century as electrical motor testing became more prevalent in industry, little research has been published on computer simulations insulation systems of motor circuits. In this paper, we will present summary results of simulating insulation systems of motors and their associated cabling systems (i.e. the motor circuit). Summary results of the difference in measurements performed on isolated cables and motors as well as when they are connected will be presented. We will also discuss how the standard insulation model may be applied to all types of insulation systems including cables, transformers, etc.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132875689","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223568
B. Kruizinga, P. Wouters, E. Steennis
Increased pressure on condition monitoring of Low Voltage (LV) underground power cables can be expected due to rising penetration of de-central generation. Digging damage plays a large role in LV cable failure statistics while those damages do not necessarily lead to an outage directly. Artificially damaged cable sections of two commonly used LV cable types have been tested on water exposure. Upon water evaporation, partial discharges occur causing degradation of the insulation material. In one case this was found to lead to breakdown. Several dependencies can be identified that need further investigation. These results enhances the understanding of failure behavior as it may take place underground for cables in service, and can be used in the development of condition monitoring techniques and lifetime predictions.
{"title":"Fault development on water ingress in damaged underground Low Voltage cables with plastic insulation","authors":"B. Kruizinga, P. Wouters, E. Steennis","doi":"10.1109/ICACACT.2014.7223568","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223568","url":null,"abstract":"Increased pressure on condition monitoring of Low Voltage (LV) underground power cables can be expected due to rising penetration of de-central generation. Digging damage plays a large role in LV cable failure statistics while those damages do not necessarily lead to an outage directly. Artificially damaged cable sections of two commonly used LV cable types have been tested on water exposure. Upon water evaporation, partial discharges occur causing degradation of the insulation material. In one case this was found to lead to breakdown. Several dependencies can be identified that need further investigation. These results enhances the understanding of failure behavior as it may take place underground for cables in service, and can be used in the development of condition monitoring techniques and lifetime predictions.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133275544","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223528
T. Heid, M. Frechette, É. David
Epoxy composites containing either Polyhedral Oligomeric Silsesquioxanes (POSS) or cubic boron nitride (c-BN), in addition to a multiphase composite with both, POSS and c-BN, were fabricated and studied. A reactive liquid POSS, namely a Triglycidylisobutyl-POSS (TGIB-POSS) was used in a content of 1 wt% for the single phase and the multiphase composite. Submicrometric c-BN was used in a content of 5 wt% for the respective single phase composite as well as in the multiphase sample to create multifunctional nanostructured composites. The test specimens were characterized by Broadband Dielectric Spectroscopy (BDS) and thermal conductivity measurements. While the single phase POSS composite revealed a slightly enhanced thermal conductivity, the single phase c-BN composite showed an improvement by 26 % in thermal conductivity compared to neat epoxy. Additionally, the dielectric and thermal properties of the multiphase composite containing 1 wt% POSS and 5 wt% c-BN, were found to be dictated by the submicrometric c-BN particles.
{"title":"Dielectric and thermal properties of nanostructured epoxy composites involving reactive POSS and c-BN","authors":"T. Heid, M. Frechette, É. David","doi":"10.1109/ICACACT.2014.7223528","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223528","url":null,"abstract":"Epoxy composites containing either Polyhedral Oligomeric Silsesquioxanes (POSS) or cubic boron nitride (c-BN), in addition to a multiphase composite with both, POSS and c-BN, were fabricated and studied. A reactive liquid POSS, namely a Triglycidylisobutyl-POSS (TGIB-POSS) was used in a content of 1 wt% for the single phase and the multiphase composite. Submicrometric c-BN was used in a content of 5 wt% for the respective single phase composite as well as in the multiphase sample to create multifunctional nanostructured composites. The test specimens were characterized by Broadband Dielectric Spectroscopy (BDS) and thermal conductivity measurements. While the single phase POSS composite revealed a slightly enhanced thermal conductivity, the single phase c-BN composite showed an improvement by 26 % in thermal conductivity compared to neat epoxy. Additionally, the dielectric and thermal properties of the multiphase composite containing 1 wt% POSS and 5 wt% c-BN, were found to be dictated by the submicrometric c-BN particles.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128895038","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223596
L. Gillette, G. Gaborit, A. Grau, J. Dahdah, F. Lecoche, L. Duvillaret
We present herein a compact voltage clamp for measuring electric field in monoconductor and multiconductors cables. The clamp exploits electro optic (EO) principle to diagnostic low or high voltage equipment. This device allows to measure electric field surrounding a multiwires power cable and permits to deduce amplitude, phase and location of each conductors in a cable. The field has been firstly theoretically investigated and numerically computed. The experiments validate the sensor performances such as dynamics and temporal resolution in an actual industrial environment.
{"title":"Towards a compact voltage clamp for monoconductor or multiconductors cable","authors":"L. Gillette, G. Gaborit, A. Grau, J. Dahdah, F. Lecoche, L. Duvillaret","doi":"10.1109/ICACACT.2014.7223596","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223596","url":null,"abstract":"We present herein a compact voltage clamp for measuring electric field in monoconductor and multiconductors cables. The clamp exploits electro optic (EO) principle to diagnostic low or high voltage equipment. This device allows to measure electric field surrounding a multiwires power cable and permits to deduce amplitude, phase and location of each conductors in a cable. The field has been firstly theoretically investigated and numerically computed. The experiments validate the sensor performances such as dynamics and temporal resolution in an actual industrial environment.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117090965","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 : 2014-08-01DOI: 10.1109/ICACACT.2014.7223486
N. Jacob, D. Oliver, S. Sherif, B. Kordi
Power transformer pressboard insulation is subject to thermal aging effects during normal operation that can result in micrometer-scale physical/morphological changes to its surface. Such surface irregularities can increase the likelihood of particle/contaminant attachment to pressboard surfaces or static electrification of oil flowing along these surfaces. Both phenomena can lead to partial discharges which can ultimately lead to insulation failure. In this work, pressboard samples were thermally stressed in air inside an oven to produce pressboards with differing levels of thermal aging and therefore varying surface irregularities. Another set of samples were immersed in insulating oil after thermal stressing, and stressed electrically to produce surface tracking partial discharges. A statistical texture analysis of the thermally and electrically stressed samples was used to demonstrate that the surface condition of pressboard samples were affected by thermal deterioration and the presence of partial discharges.
{"title":"Statistical texture analysis of morphological changes in pressboard insulation due to thermal aging and partial discharges","authors":"N. Jacob, D. Oliver, S. Sherif, B. Kordi","doi":"10.1109/ICACACT.2014.7223486","DOIUrl":"https://doi.org/10.1109/ICACACT.2014.7223486","url":null,"abstract":"Power transformer pressboard insulation is subject to thermal aging effects during normal operation that can result in micrometer-scale physical/morphological changes to its surface. Such surface irregularities can increase the likelihood of particle/contaminant attachment to pressboard surfaces or static electrification of oil flowing along these surfaces. Both phenomena can lead to partial discharges which can ultimately lead to insulation failure. In this work, pressboard samples were thermally stressed in air inside an oven to produce pressboards with differing levels of thermal aging and therefore varying surface irregularities. Another set of samples were immersed in insulating oil after thermal stressing, and stressed electrically to produce surface tracking partial discharges. A statistical texture analysis of the thermally and electrically stressed samples was used to demonstrate that the surface condition of pressboard samples were affected by thermal deterioration and the presence of partial discharges.","PeriodicalId":101532,"journal":{"name":"2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124068955","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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