Pub Date : 2021-10-25DOI: 10.1109/itec-ap.2014.6940613
Hanqing Liang, X. Mao, Yadong Liu, G. Sheng, Yichun Tian, M. Malekpour, Yuwei Fu, Xiaohua Wang, A. Yang, Jiandong Duan, Taufik Rossal Sukma, U. Khayam, Ryouya Sugawara, Hina Yoshikawa, M. Kozako, M. Hikita, Osamu, Eda, Masanori Otsuka
Paper Authors Title P3 Tianxin Zhuang, Shujing Yang, Ming Ren and Bo Song Dielectric Loss Factor And Circuit Impedance Under Partial Discharge Via Excess Current Detection P4 Hanqing Liang, Xianyin Mao, Yadong Liu, Gehao Sheng and Xiuchen Jiang Methodology For Obtaining Key Transient Information of Unsymmetrical Earth Fault in Overhead Transmission Line P5 Yichun Tian and Zhenhua Li Research status analysis of reactive power compensation technology for power grid P6 Majid Malekpour, Toan Phung and Eliathamby Ambikairajah Modelling and Diagnostic of Incipient Stator Inter-turn Short Circuit Fault in Induction Motors P8 Yuwei Fu, Xiaohua Wang, Aijun Yang and Jiandong Duan Compositions of SF6 – H2O – O2 Decaying Arc at a Temperature Range of 1000 – 12000 K P9 Taufik Rossal Sukma, Umar Khayam, Suwarno, Ryouya Sugawara, Hina Yoshikawa, Masahiro Kozako, Masayuki Hikita, Osamu Eda, Masanori Otsuka, Hiroshi Kaneko and Yasuharu Shiina Classification of Partial Discharge Sources using Waveform Parameter and Phase-Resolved Partial Discharge Pattern as Input for Artificial Neural Network
{"title":"Author/Paper Index","authors":"Hanqing Liang, X. Mao, Yadong Liu, G. Sheng, Yichun Tian, M. Malekpour, Yuwei Fu, Xiaohua Wang, A. Yang, Jiandong Duan, Taufik Rossal Sukma, U. Khayam, Ryouya Sugawara, Hina Yoshikawa, M. Kozako, M. Hikita, Osamu, Eda, Masanori Otsuka","doi":"10.1109/itec-ap.2014.6940613","DOIUrl":"https://doi.org/10.1109/itec-ap.2014.6940613","url":null,"abstract":"Paper Authors Title P3 Tianxin Zhuang, Shujing Yang, Ming Ren and Bo Song Dielectric Loss Factor And Circuit Impedance Under Partial Discharge Via Excess Current Detection P4 Hanqing Liang, Xianyin Mao, Yadong Liu, Gehao Sheng and Xiuchen Jiang Methodology For Obtaining Key Transient Information of Unsymmetrical Earth Fault in Overhead Transmission Line P5 Yichun Tian and Zhenhua Li Research status analysis of reactive power compensation technology for power grid P6 Majid Malekpour, Toan Phung and Eliathamby Ambikairajah Modelling and Diagnostic of Incipient Stator Inter-turn Short Circuit Fault in Induction Motors P8 Yuwei Fu, Xiaohua Wang, Aijun Yang and Jiandong Duan Compositions of SF6 – H2O – O2 Decaying Arc at a Temperature Range of 1000 – 12000 K P9 Taufik Rossal Sukma, Umar Khayam, Suwarno, Ryouya Sugawara, Hina Yoshikawa, Masahiro Kozako, Masayuki Hikita, Osamu Eda, Masanori Otsuka, Hiroshi Kaneko and Yasuharu Shiina Classification of Partial Discharge Sources using Waveform Parameter and Phase-Resolved Partial Discharge Pattern as Input for Artificial Neural Network","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"14 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89238691","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535968
P. Muangpratoom, A. Kunakorn, N. Pattanadech, W. Vittayakorn, K. Thungsook
This research paper describes and analyzes various experiments designed to investigate the dielectric properties (at a series of pre-determined test temperatures and % moisture content) of mineral oil-based nanofluids produced by the incorporation of zinc oxide (ZnO) powder (of mean diameter less than 100nm) into a standard mineral oil, with the surfactant sorbitan mono-oleate (Span 80) added to modify the surface of the nanoparticles in all but the control sample. Five different nanofluid test samples (one control sample and four modified samples) based on the standard mineral oil were produced for testing: 1) a control sample containing no Span 80 and no ZnO, 2) a modified sample with Span 80, and ZnO volume fraction of 0.01 %, 3) a modified sample without Span 80, and ZnO volume fraction of 0.01 %, 4) a modified sample with Span 80, and ZnO volume fraction of 0.03%, and 5) a modified sample without Span 80, and ZnO volume fraction of 0.03 %. In addition, the five liquid samples above were tested to determine AC breakdown voltage at seven different temperatures in the range of 35°C to 90°C. The test circuit was set up in accordance with IEC 60156 using a sphere-sphere electrode configuration with gap spacing of 2.5 mm. Several significant results were obtained from the investigation. Firstly, ZnO nanoparticles had a positive effect on all the test solutions in which they were used. Second, a positive relationship was confirmed between breakdown voltages, temperature rise. Third, a negative correlation was established between higher concentration of ZnO nanoparticles and breakdown voltage. Fourth, the use of surfactant proved to have both positive and negative effects on breakdown voltages.
{"title":"Dielectric Properties of Mineral Oil-based Nanofluids using Zinc Oxide Nano-composites for Power Transformer Application","authors":"P. Muangpratoom, A. Kunakorn, N. Pattanadech, W. Vittayakorn, K. Thungsook","doi":"10.1109/CMD.2018.8535968","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535968","url":null,"abstract":"This research paper describes and analyzes various experiments designed to investigate the dielectric properties (at a series of pre-determined test temperatures and % moisture content) of mineral oil-based nanofluids produced by the incorporation of zinc oxide (ZnO) powder (of mean diameter less than 100nm) into a standard mineral oil, with the surfactant sorbitan mono-oleate (Span 80) added to modify the surface of the nanoparticles in all but the control sample. Five different nanofluid test samples (one control sample and four modified samples) based on the standard mineral oil were produced for testing: 1) a control sample containing no Span 80 and no ZnO, 2) a modified sample with Span 80, and ZnO volume fraction of 0.01 %, 3) a modified sample without Span 80, and ZnO volume fraction of 0.01 %, 4) a modified sample with Span 80, and ZnO volume fraction of 0.03%, and 5) a modified sample without Span 80, and ZnO volume fraction of 0.03 %. In addition, the five liquid samples above were tested to determine AC breakdown voltage at seven different temperatures in the range of 35°C to 90°C. The test circuit was set up in accordance with IEC 60156 using a sphere-sphere electrode configuration with gap spacing of 2.5 mm. Several significant results were obtained from the investigation. Firstly, ZnO nanoparticles had a positive effect on all the test solutions in which they were used. Second, a positive relationship was confirmed between breakdown voltages, temperature rise. Third, a negative correlation was established between higher concentration of ZnO nanoparticles and breakdown voltage. Fourth, the use of surfactant proved to have both positive and negative effects on breakdown voltages.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"40 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74081928","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535904
M. Tian, B. Du, J. Su, Jin Li, L. W. Zhu, Y. Yu
Harmonic voltage can be transferred by the converter transformer on AC and DC sides in high-voltage direct-current (HVDC), which can distort the DC voltage quality. This work investigates the electrical treeing process in molded epoxy resin under combined DC-harmonic voltage. A digital microscope system was employed to observe the electrical treeing process. With the DC voltage ranging from −20 kV to +20 kV, different combined waveforms of DC and harmonic voltage were used as the applied voltage. Width/length ratio was employed to describe the propagation process of electrical tree in two dimensions. Results show that the DC voltage amplitude is a key factor for the electrical treeing process. The distribution of tree structures (branch and bush-branch) depends greatly on the polarity of DC voltage in room temperature. Under the same harmonic voltage, the width/length ratio with negative DC voltage is larger than that with positive DC voltage. Meanwhile, positive DC voltage can lead to the electrical breakdown easier. In addition, ‘reverse tree’ has been found in epoxy resin in pure harmonic voltage, which grows from the plate electrode toward the needle electrode when the electrical tree has bridged the insulation.
{"title":"Electrical Tree in Epoxy Resin under Combined DC-harmonic Voltage","authors":"M. Tian, B. Du, J. Su, Jin Li, L. W. Zhu, Y. Yu","doi":"10.1109/CMD.2018.8535904","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535904","url":null,"abstract":"Harmonic voltage can be transferred by the converter transformer on AC and DC sides in high-voltage direct-current (HVDC), which can distort the DC voltage quality. This work investigates the electrical treeing process in molded epoxy resin under combined DC-harmonic voltage. A digital microscope system was employed to observe the electrical treeing process. With the DC voltage ranging from −20 kV to +20 kV, different combined waveforms of DC and harmonic voltage were used as the applied voltage. Width/length ratio was employed to describe the propagation process of electrical tree in two dimensions. Results show that the DC voltage amplitude is a key factor for the electrical treeing process. The distribution of tree structures (branch and bush-branch) depends greatly on the polarity of DC voltage in room temperature. Under the same harmonic voltage, the width/length ratio with negative DC voltage is larger than that with positive DC voltage. Meanwhile, positive DC voltage can lead to the electrical breakdown easier. In addition, ‘reverse tree’ has been found in epoxy resin in pure harmonic voltage, which grows from the plate electrode toward the needle electrode when the electrical tree has bridged the insulation.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"26 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74173405","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}
Real-time and robust location of anomaly in distribution system plays an important role. However, the data collected by the micro-phasor measurement unit (µPMU) is massive and diversified, and it is urgent to take effective method to excavate the massive data to realize the location of abnormal signals. This paper proposes a novel method to locate the anomaly based on linear shrinkage (LS) and principal component analysis (PCA). The data matrix constructed from µPMU is compressed effectively. By the remained key features, we obtain the corresponding principal component scores. The simulation results have showed that the anomaly can be located exactly according to the scores. Besides, we use LS to avoid the influence of the huge noise. A large number of simulation results show that the method can quickly and accurately realize the anomaly localization in distribution network, and the method has a strong robustness. Even under low SNR environment, the reliability of most abnormal source localization is more than 93%
{"title":"A Novel Anomaly Localization Method on PMU Measure System Based on LS and PCA","authors":"Zilong Li, Yadong Liu, Honglin Wang, Guanglei Huang","doi":"10.1109/CMD.2018.8535660","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535660","url":null,"abstract":"Real-time and robust location of anomaly in distribution system plays an important role. However, the data collected by the micro-phasor measurement unit (µPMU) is massive and diversified, and it is urgent to take effective method to excavate the massive data to realize the location of abnormal signals. This paper proposes a novel method to locate the anomaly based on linear shrinkage (LS) and principal component analysis (PCA). The data matrix constructed from µPMU is compressed effectively. By the remained key features, we obtain the corresponding principal component scores. The simulation results have showed that the anomaly can be located exactly according to the scores. Besides, we use LS to avoid the influence of the huge noise. A large number of simulation results show that the method can quickly and accurately realize the anomaly localization in distribution network, and the method has a strong robustness. Even under low SNR environment, the reliability of most abnormal source localization is more than 93%","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"18 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73408496","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535988
N. Phumipunepon, P. Chaisiri, K. Thungsook, N. Pattanadech
This paper presents the dielectric analysis of the simulated degradation stator bars compared with unmodified stator bars. The stator bars used in the experiments were acquired from the 30 year in-service synchronous machine of a hydro power plant. The simulated degradation stator bars were prepared and comprised of outer corona protection degradation stator bars, partial discharge (PD) stator bars and thermal degradation stator bars. In case of the outer corona protection degradation, the outer corona protection surface was abraded for small damages. For PD degradation bar, the PD existing bars were used for the experiment. In case of thermal degradation stator bars, they were divided into three groups, the first group of stator bars was heated in the oven at 100°C for 12 hours. The second and third group stator bar was heated at 120 and 140 °C respectively for 12 hours as well. After preparing the test objects, the polarization and depolarization current (PDC) were performed with the mentioned stator bars. The PDC test results were recorded. The test results showed that the polarization currents and depolarization currents, the conduction currents and the capacitances of the simulated degradation stator bars were clearly different from these of the unmodified stator bars. Other analysis parts are reported also in the paper. This paper suggests that PDC test technique is one of the effective methods for evaluation of the stator bar insulation characteristics.
{"title":"Polarization and Depolarization Current Characteristics of Degradation Stator Insulation of A Rotating Machine","authors":"N. Phumipunepon, P. Chaisiri, K. Thungsook, N. Pattanadech","doi":"10.1109/CMD.2018.8535988","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535988","url":null,"abstract":"This paper presents the dielectric analysis of the simulated degradation stator bars compared with unmodified stator bars. The stator bars used in the experiments were acquired from the 30 year in-service synchronous machine of a hydro power plant. The simulated degradation stator bars were prepared and comprised of outer corona protection degradation stator bars, partial discharge (PD) stator bars and thermal degradation stator bars. In case of the outer corona protection degradation, the outer corona protection surface was abraded for small damages. For PD degradation bar, the PD existing bars were used for the experiment. In case of thermal degradation stator bars, they were divided into three groups, the first group of stator bars was heated in the oven at 100°C for 12 hours. The second and third group stator bar was heated at 120 and 140 °C respectively for 12 hours as well. After preparing the test objects, the polarization and depolarization current (PDC) were performed with the mentioned stator bars. The PDC test results were recorded. The test results showed that the polarization currents and depolarization currents, the conduction currents and the capacitances of the simulated degradation stator bars were clearly different from these of the unmodified stator bars. Other analysis parts are reported also in the paper. This paper suggests that PDC test technique is one of the effective methods for evaluation of the stator bar insulation characteristics.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"124 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77655135","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535733
Deyuan Liu, Yu Zhang, Yunkun Deng, Jiandong Wu, Y. Yin
In this paper, the space charge behavior in 35mm cable insulation was studied. Space charge profiles of a cross-linked polyethylene (XLPE) cable were obtained through a full-scale measurement system based on the pulsed electroacoustic (PEA) method. The high voltage pulse was coupled to the measurement area through the contiguous insulation. Due to the attenuation and dispersion, the acoustic signal generated by the pulse near the copper core was significantly affected during the propagation to the sensor. Limited by the dc voltage source, the applied electric field is relatively low. Thus, a one-dimensional bipolar charge transport model was developed to study the space charge characteristic under high dc stress. The model was optimized for the coaxial cable on the aspect of cylindrical geometry under dc stress. Poisson's equation, continuity equation and transport equation were solved, with injection and extraction, trapping and detrapping, and recombination taken into account. By comparing the space charge profiles obtained respectively from experiment and simulation, the accuracy of the simulation is verified.
{"title":"Experiment and Simulation of Space Charge Distribution in 35mm Cable Insulation","authors":"Deyuan Liu, Yu Zhang, Yunkun Deng, Jiandong Wu, Y. Yin","doi":"10.1109/CMD.2018.8535733","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535733","url":null,"abstract":"In this paper, the space charge behavior in 35mm cable insulation was studied. Space charge profiles of a cross-linked polyethylene (XLPE) cable were obtained through a full-scale measurement system based on the pulsed electroacoustic (PEA) method. The high voltage pulse was coupled to the measurement area through the contiguous insulation. Due to the attenuation and dispersion, the acoustic signal generated by the pulse near the copper core was significantly affected during the propagation to the sensor. Limited by the dc voltage source, the applied electric field is relatively low. Thus, a one-dimensional bipolar charge transport model was developed to study the space charge characteristic under high dc stress. The model was optimized for the coaxial cable on the aspect of cylindrical geometry under dc stress. Poisson's equation, continuity equation and transport equation were solved, with injection and extraction, trapping and detrapping, and recombination taken into account. By comparing the space charge profiles obtained respectively from experiment and simulation, the accuracy of the simulation is verified.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"17 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79431554","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535717
S. Nielsen
On-line measurement of the FRA spectrum of large power transformers requires a signal injection and extraction methodology that can isolates the measurement system from the high voltages present in an operational transformer. It has been shown by numerous researchers, that the bushing test tap of capacitivly-graded or condenser bushings can be a used as a convenient point for capacitivly injecting and extracting signals from a transformer. These signals can that then be used for condition monitoring purposes such as FRA and PD. The presence of this capacitive injection and extraction path in the on-line FRA measurement chain will result in a modification of the measured transformer spectrum when compared to the windings on their own. This modification of the on-line FRA spectrum can be accounted for if an accurate electrical model of the on-line FRA measurement chain is developed that includes an accurate model of the bushings used. An equivalent “Pi” model of an epoxy cast bushing with an integral CVT voltage tap is developed through measurement and simulation. The work presented in this paper, further looks at the development of a cascade two-port transmission matrix model for the on-line FRA measurement chain that includes the developed bushing model. Using matrix manipulation of this transmission matrix model, it is possible to extract the transformers winding response spectrum from the measured on-line FRA spectrum. Experimental results are performed to validate the developed mathematical models.
{"title":"Reconstruction of the Transformer Response from on-Line FRA Measurements Performed via Bushing Taps","authors":"S. Nielsen","doi":"10.1109/CMD.2018.8535717","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535717","url":null,"abstract":"On-line measurement of the FRA spectrum of large power transformers requires a signal injection and extraction methodology that can isolates the measurement system from the high voltages present in an operational transformer. It has been shown by numerous researchers, that the bushing test tap of capacitivly-graded or condenser bushings can be a used as a convenient point for capacitivly injecting and extracting signals from a transformer. These signals can that then be used for condition monitoring purposes such as FRA and PD. The presence of this capacitive injection and extraction path in the on-line FRA measurement chain will result in a modification of the measured transformer spectrum when compared to the windings on their own. This modification of the on-line FRA spectrum can be accounted for if an accurate electrical model of the on-line FRA measurement chain is developed that includes an accurate model of the bushings used. An equivalent “Pi” model of an epoxy cast bushing with an integral CVT voltage tap is developed through measurement and simulation. The work presented in this paper, further looks at the development of a cascade two-port transmission matrix model for the on-line FRA measurement chain that includes the developed bushing model. Using matrix manipulation of this transmission matrix model, it is possible to extract the transformers winding response spectrum from the measured on-line FRA spectrum. Experimental results are performed to validate the developed mathematical models.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"460 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81618294","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535664
Kwi-Jun Kang, Jung-Won Lee, Eun-Dong Lee, Myungsu Kim
Underground distribution system area of main city infrastructure underground electric power conduit pipe that is built up, to supply electric power to the area is constructed using, a supply method to increase power supply when the number of electric power cable lines is 9 or more. In particular, the failures of a power cables in Underground electric power conduit pipe are a main reasons which, cause not only widespread, power outages,) at home and industries but degradation of, the power qualities. For the stable power supply, an effective diagnosis method based on cause analysis Out of a power cable quality degrading cases and failures in Underground electric power conduit pipe shall be utilized to prevent the faults. In this study, it focuses on the results of the diagnosis characteristic analysis of a power cable in Underground electric power conduit pipe which is currently widely-used, in Korea, for years. It describes a robot system (a multi-angle refracting robot arm capable of monitoring the state of an power cable and facilities in an electric power conduit pipe without any blind spot during a 24-hour) diagnostic techniques of a power cable in Underground electric power conduit pipe to predict risks of power cable failures based on cause analysis and preventive diagnosis such as diagnostic methods, principles, characteristics, applicable cases, actual feedbacks, etc. and to minimize the power faults due to aging and poor maintenance of the facility.
{"title":"Intelligent Autonomous driving Condition Monitoring and Diagnosis Robot-system of Underground electric power conduit pipe","authors":"Kwi-Jun Kang, Jung-Won Lee, Eun-Dong Lee, Myungsu Kim","doi":"10.1109/CMD.2018.8535664","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535664","url":null,"abstract":"Underground distribution system area of main city infrastructure underground electric power conduit pipe that is built up, to supply electric power to the area is constructed using, a supply method to increase power supply when the number of electric power cable lines is 9 or more. In particular, the failures of a power cables in Underground electric power conduit pipe are a main reasons which, cause not only widespread, power outages,) at home and industries but degradation of, the power qualities. For the stable power supply, an effective diagnosis method based on cause analysis Out of a power cable quality degrading cases and failures in Underground electric power conduit pipe shall be utilized to prevent the faults. In this study, it focuses on the results of the diagnosis characteristic analysis of a power cable in Underground electric power conduit pipe which is currently widely-used, in Korea, for years. It describes a robot system (a multi-angle refracting robot arm capable of monitoring the state of an power cable and facilities in an electric power conduit pipe without any blind spot during a 24-hour) diagnostic techniques of a power cable in Underground electric power conduit pipe to predict risks of power cable failures based on cause analysis and preventive diagnosis such as diagnostic methods, principles, characteristics, applicable cases, actual feedbacks, etc. and to minimize the power faults due to aging and poor maintenance of the facility.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81629749","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 : 2018-09-01DOI: 10.1109/CMD.2018.8535858
Lin Liu, Xiaoang Li, Qiaogen Zhang, Junping Zhao, Chengjun Liang, Zhibing Li
Insulator surface flashover is one of the main causations for the gas insulated metal enclosed switchgear (GIS) devices failure. According to the previous studies, the metal particles plays an important role in the flashover of insulators, and the flashover voltage decreases more under impulse voltage than AC/DC voltage. As a result, the lightning impulse voltage is regarded as an effective way to detect of the metal particle. In this paper, epoxy resin post insulators with concave, convex and wave shape were manufactured, and a Marx generator was used to supply the standard lightning impulse (1.2/50µs). The flashover voltage of the samples with aluminum particle attached in different surface position were studied. The surface electric field strength of samples were calculated by the finite element method. The results show that there is an obvious flashover voltage reduction (up to 41.8%) when the particle attached to the high electric field region. Otherwise, there is little influence on the surface flashover voltage (down to 0%). The wave insulator of which the surface electric field varies the most is the least sensitivity to the metal particle. As a result, to improve the metal particle tolerance, insulator with a varied surface electric field along the surface should be designed.
{"title":"Surface Flashover of GIS Insulator Attached with Metal Particles Under Lightning Impulse","authors":"Lin Liu, Xiaoang Li, Qiaogen Zhang, Junping Zhao, Chengjun Liang, Zhibing Li","doi":"10.1109/CMD.2018.8535858","DOIUrl":"https://doi.org/10.1109/CMD.2018.8535858","url":null,"abstract":"Insulator surface flashover is one of the main causations for the gas insulated metal enclosed switchgear (GIS) devices failure. According to the previous studies, the metal particles plays an important role in the flashover of insulators, and the flashover voltage decreases more under impulse voltage than AC/DC voltage. As a result, the lightning impulse voltage is regarded as an effective way to detect of the metal particle. In this paper, epoxy resin post insulators with concave, convex and wave shape were manufactured, and a Marx generator was used to supply the standard lightning impulse (1.2/50µs). The flashover voltage of the samples with aluminum particle attached in different surface position were studied. The surface electric field strength of samples were calculated by the finite element method. The results show that there is an obvious flashover voltage reduction (up to 41.8%) when the particle attached to the high electric field region. Otherwise, there is little influence on the surface flashover voltage (down to 0%). The wave insulator of which the surface electric field varies the most is the least sensitivity to the metal particle. As a result, to improve the metal particle tolerance, insulator with a varied surface electric field along the surface should be designed.","PeriodicalId":6529,"journal":{"name":"2018 Condition Monitoring and Diagnosis (CMD)","volume":"414 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80821195","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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