Pub Date : 2012-11-26DOI: 10.1109/ICHVE.2012.6357057
E. Ildstad, H. Faremo
This paper presents results from water tree ageing experiments of XLPE cables exposed to both voltage stress and mechanical tension. The main purpose was to examine possible water tree enhancement due to dynamic mechanical tension forces, likely to occur in power cables connected to floating off-shore constructions. All experiments were performed using samples taken from a 12 kV triple extruded XLPE cable with copper conductor. A test rig was made for both static and dynamic stretching of approximately 1m long cable sections without conductor. Simultaneously strains with a maximum of 6% elongation and an effective 50 Hz AC voltage of 14 kV were applied across the cable insulation. During ageing the cable samples were submerged in tap water kept at 30°C. Both the density and growth rate of bow-tie water trees and vented water trees from the conductor screen were found to increase significantly with increasing mechanical tension. No significant growth enhancement was found in case of dynamic mechanical load compared to that of static mechanical tension. Very few vented trees were found to originate from the insulation screen. - This indicates that also the contribution from compression and tension stresses frozen in during the manufacturing process need to be considered.
{"title":"Effect of dynamic mechanical load on water treeing of XLPE cables","authors":"E. Ildstad, H. Faremo","doi":"10.1109/ICHVE.2012.6357057","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357057","url":null,"abstract":"This paper presents results from water tree ageing experiments of XLPE cables exposed to both voltage stress and mechanical tension. The main purpose was to examine possible water tree enhancement due to dynamic mechanical tension forces, likely to occur in power cables connected to floating off-shore constructions. All experiments were performed using samples taken from a 12 kV triple extruded XLPE cable with copper conductor. A test rig was made for both static and dynamic stretching of approximately 1m long cable sections without conductor. Simultaneously strains with a maximum of 6% elongation and an effective 50 Hz AC voltage of 14 kV were applied across the cable insulation. During ageing the cable samples were submerged in tap water kept at 30°C. Both the density and growth rate of bow-tie water trees and vented water trees from the conductor screen were found to increase significantly with increasing mechanical tension. No significant growth enhancement was found in case of dynamic mechanical load compared to that of static mechanical tension. Very few vented trees were found to originate from the insulation screen. - This indicates that also the contribution from compression and tension stresses frozen in during the manufacturing process need to be considered.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"101 1","pages":"55-58"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76866816","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357033
Lijun Yang, M. S. Zadeh, J. Schiessling, O. Hjortstam, Y. Serdyuk, S. Gubanski
Conduction process in dielectric liquids usually occurs due to ion migration and is therefore characterized by concentration and mobility of the ionic charge carriers. For this reason accurately determining these parameters and especially ion mobility in insulating oils for HVDC applications needs to be done precisely. In this report various methods for determining ion mobility are described, including single polarity, reversal polarity methods in time domain as well as frequency domain based measurement of dielectric response. The advantages and disadvantages of each of them are presented and illustrated with the results of measurements on various oils using two different test cells. The dependence of ion mobility on measuring voltage level and temperature are analyzed and compared.
{"title":"Measurement of ion mobility in transformer oils for HVDC applications","authors":"Lijun Yang, M. S. Zadeh, J. Schiessling, O. Hjortstam, Y. Serdyuk, S. Gubanski","doi":"10.1109/ICHVE.2012.6357033","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357033","url":null,"abstract":"Conduction process in dielectric liquids usually occurs due to ion migration and is therefore characterized by concentration and mobility of the ionic charge carriers. For this reason accurately determining these parameters and especially ion mobility in insulating oils for HVDC applications needs to be done precisely. In this report various methods for determining ion mobility are described, including single polarity, reversal polarity methods in time domain as well as frequency domain based measurement of dielectric response. The advantages and disadvantages of each of them are presented and illustrated with the results of measurements on various oils using two different test cells. The dependence of ion mobility on measuring voltage level and temperature are analyzed and compared.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"25 1","pages":"464-467"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77032807","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357067
Youyuan Wang, Miao-miao Tian, Tao Yang
Kraft paper is widely used in oil-paper transformer insulation. This type of cellulose insulation paper has many advantages, but deteriorates under the combined influence of a number of interrelated factors during the power transformer's long-term running. So modifications on insulation paper for power transformer are in great demand, and chemical modification of insulation materials is one of the main research topics in the field of material modification. This review covers cyanoethylated chemical modification on insulation paper, and relevant models were constructed by molecular simulation, which is often used to analyze microcosmic mechanism and cover the shortage of conventional experimental. The Discover module based on molecular dynamics was performed to study the mechanical properties and hygroscopic behavior of modified cellulose and the thermal stability was analyzed by the analysis of hydrogen bonds. Simulation results showed that chemical structure changes have great influence on mechanical properties and hygroscopicity of kraft paper. The decreasing number of hydrogen bonds and mechanical modulus displayed the degradation of mechanical properties. Chemical modifications whittled away the binding abilities of cellulose and water, weakening the hygroscopicity of kraft paper.
{"title":"Influence of cyanoethylated chemical modification on transformer insulation paper: Molecular modeling study","authors":"Youyuan Wang, Miao-miao Tian, Tao Yang","doi":"10.1109/ICHVE.2012.6357067","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357067","url":null,"abstract":"Kraft paper is widely used in oil-paper transformer insulation. This type of cellulose insulation paper has many advantages, but deteriorates under the combined influence of a number of interrelated factors during the power transformer's long-term running. So modifications on insulation paper for power transformer are in great demand, and chemical modification of insulation materials is one of the main research topics in the field of material modification. This review covers cyanoethylated chemical modification on insulation paper, and relevant models were constructed by molecular simulation, which is often used to analyze microcosmic mechanism and cover the shortage of conventional experimental. The Discover module based on molecular dynamics was performed to study the mechanical properties and hygroscopic behavior of modified cellulose and the thermal stability was analyzed by the analysis of hydrogen bonds. Simulation results showed that chemical structure changes have great influence on mechanical properties and hygroscopicity of kraft paper. The decreasing number of hydrogen bonds and mechanical modulus displayed the degradation of mechanical properties. Chemical modifications whittled away the binding abilities of cellulose and water, weakening the hygroscopicity of kraft paper.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"200 1","pages":"119-122"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80133582","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357076
M. H. Ahmad, H. Ahmad, N. Bashir, M. Dolmat, Y. Arief, Z. A. Malek, A. Jamil
Epoxy resin is a kind of polymer which has advantages such as good thermal characteristics, excellent adhesion, good water repellent and resistance to pollution. During operation, field enhancement sites such as in void and protrusion may exist within the polymeric insulation. Degradation of the insulation may start from these parts and electrical treeing will grow. The appearance of an electrical treeing is a sign of degradation that develops in insulation. In view of this there have been numerous studies on various types of fillers which serve as treeing retardants. This paper presents investigation on the effect of a new organic filler, Oil Palm Empty Fruit Bunch (OPEFB), on the electrical tree propagation in Epoxy resin It was found that the tree propagation time for the sample containing 1 wt % OPEFB was 50 minutes with tree length of 0.64 mm while the non-filled sample exhibited a tree length of 1.7 mm at 30 minutes implying the tree length of filled sample was shorter than tree length of non-filled sample and the tree propagation time for filled sample was longer than non-filled sample. It was also observed that the electrical tree in filled sample appeared in the form of bush-type tree whereas electrical tree in non-filled sample grew in a straight manner in the form of branch-type tree. This finding suggests that the OPEFB used in this study as organic filler has helped to slow down the tree propagation time and increased the insulation lifetime.
{"title":"Effects of oil palm empty fruit bunch filler on electrical tree propagation in Epoxy resin","authors":"M. H. Ahmad, H. Ahmad, N. Bashir, M. Dolmat, Y. Arief, Z. A. Malek, A. Jamil","doi":"10.1109/ICHVE.2012.6357076","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357076","url":null,"abstract":"Epoxy resin is a kind of polymer which has advantages such as good thermal characteristics, excellent adhesion, good water repellent and resistance to pollution. During operation, field enhancement sites such as in void and protrusion may exist within the polymeric insulation. Degradation of the insulation may start from these parts and electrical treeing will grow. The appearance of an electrical treeing is a sign of degradation that develops in insulation. In view of this there have been numerous studies on various types of fillers which serve as treeing retardants. This paper presents investigation on the effect of a new organic filler, Oil Palm Empty Fruit Bunch (OPEFB), on the electrical tree propagation in Epoxy resin It was found that the tree propagation time for the sample containing 1 wt % OPEFB was 50 minutes with tree length of 0.64 mm while the non-filled sample exhibited a tree length of 1.7 mm at 30 minutes implying the tree length of filled sample was shorter than tree length of non-filled sample and the tree propagation time for filled sample was longer than non-filled sample. It was also observed that the electrical tree in filled sample appeared in the form of bush-type tree whereas electrical tree in non-filled sample grew in a straight manner in the form of branch-type tree. This finding suggests that the OPEFB used in this study as organic filler has helped to slow down the tree propagation time and increased the insulation lifetime.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"1 1","pages":"203-206"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79968723","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357108
Fu Wan, Weigen Chen, X. Peng, Jing Shi
Photoacoustic spectroscopy (PAS) is a highly sensitive gas analyzing method without the shortcoming of gas consumption, which can be well applied in online monitoring of dissolved gas-in-oil. The effect of gas pressure on the photoacoustic spectroscopy detection is significant. Functional relations between gas pressure and gas absorption coefficient as well as PAV signal were derived theoretically. The experimental results of the acetylene , methane and carbon dioxide dissolved in transformer oil show the correctness of the functional relations above and that Photoacoustic spectroscopy voltage signal has a good linear dependence on the 1.5th root of P (0KPa<;P<;75KPa ) and the square root of P(75KPa<;P<;100KPa)when without gas absorption saturation effect. The theoretical and experimental results supply reference and technical support for further improvements in oil gas photoacoustic spectroscopy of on-line monitoring system.
{"title":"Study on the gas pressure characteristics of photoacoustic spectroscopy detection for dissolved gases in transformer oil","authors":"Fu Wan, Weigen Chen, X. Peng, Jing Shi","doi":"10.1109/ICHVE.2012.6357108","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357108","url":null,"abstract":"Photoacoustic spectroscopy (PAS) is a highly sensitive gas analyzing method without the shortcoming of gas consumption, which can be well applied in online monitoring of dissolved gas-in-oil. The effect of gas pressure on the photoacoustic spectroscopy detection is significant. Functional relations between gas pressure and gas absorption coefficient as well as PAV signal were derived theoretically. The experimental results of the acetylene , methane and carbon dioxide dissolved in transformer oil show the correctness of the functional relations above and that Photoacoustic spectroscopy voltage signal has a good linear dependence on the 1.5th root of P (0KPa<;P<;75KPa ) and the square root of P(75KPa<;P<;100KPa)when without gas absorption saturation effect. The theoretical and experimental results supply reference and technical support for further improvements in oil gas photoacoustic spectroscopy of on-line monitoring system.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"43 1","pages":"286-289"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91530191","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357023
Tuan Liu, R. Liao, F. Zhang, Lijun Yang
SiO2 hollow spheres and K-SiO2 insulation paper handsheets composed of these SiO2 hollow spheres with different weight percentages were synthesized. SiO2 hollow spheres with a low content were uniformly dispersed. However, the SiO2 hollow spheres locally aggregated with increased concentration. The relative permittivities of the immersed oil K-SiO2 handsheets initially decreased and then increased with increased SiO2 hollow sphere content. K-5% SiO2 had the lowest relative permittivity. Simulation analysis indicated that the electric field distribution between the two test electrodes was uniform. The breakdown voltage of the paper-oil-paper composite insulation system increased with decreased relative permittivity of the paper. The breakdown voltage of the composite insulation system increased from 26.4 kV to 30.5 kV when the relative permittivity of the paper decreased from 2.55 to 1.68. The experimental results were also consistent with the theoretically calculated data. And in the paper-oil-paper composite insulation system, the electric field strength of the oil gap decreased with decreased relative permittivity of the paper.
{"title":"Preparation and performance of a low relative permittivity insulation paper","authors":"Tuan Liu, R. Liao, F. Zhang, Lijun Yang","doi":"10.1109/ICHVE.2012.6357023","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357023","url":null,"abstract":"SiO2 hollow spheres and K-SiO2 insulation paper handsheets composed of these SiO2 hollow spheres with different weight percentages were synthesized. SiO2 hollow spheres with a low content were uniformly dispersed. However, the SiO2 hollow spheres locally aggregated with increased concentration. The relative permittivities of the immersed oil K-SiO2 handsheets initially decreased and then increased with increased SiO2 hollow sphere content. K-5% SiO2 had the lowest relative permittivity. Simulation analysis indicated that the electric field distribution between the two test electrodes was uniform. The breakdown voltage of the paper-oil-paper composite insulation system increased with decreased relative permittivity of the paper. The breakdown voltage of the composite insulation system increased from 26.4 kV to 30.5 kV when the relative permittivity of the paper decreased from 2.55 to 1.68. The experimental results were also consistent with the theoretically calculated data. And in the paper-oil-paper composite insulation system, the electric field strength of the oil gap decreased with decreased relative permittivity of the paper.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"69 1","pages":"211-214"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89876489","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357133
Yan Wang, Jian Li, Yuming Zhao, Zhiman He, Sicheng Wu, Lianwei Bao
The insulation of windings connected with converter valves have to withstand AC, DC and repetitive impulse combined voltages in converter transformers. This paper presented the failure evaluation model by experimental research on electrical breakdown characteristics of oil-paper insulation under AC, DC and AC-DC combined voltages. Both short-time tests and constant-stress tests were carried out when the insulation system was subjected to different applied voltages. The breakdown strength and times-to-breakdown of oil-paper specimens have been investigated by tests. The inverse power model was presented by the weibull parameters which were estimated by the times-to-breakdown of specimens. Using the parameters of weibull model and inverse power model, the functions of failure evaluation model were calculated. It could establish the relationship between times, voltages and failure probability of insulation. And final evaluation results showed it was more effective than tradition failure model and weibull model. The DC component behavior in the insulation system has been analyzed and the influence of AC-DC combined voltages on insulation system was discussed.
{"title":"Failure evaluation model of oil-paper insulation under AC-DC combined voltages","authors":"Yan Wang, Jian Li, Yuming Zhao, Zhiman He, Sicheng Wu, Lianwei Bao","doi":"10.1109/ICHVE.2012.6357133","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357133","url":null,"abstract":"The insulation of windings connected with converter valves have to withstand AC, DC and repetitive impulse combined voltages in converter transformers. This paper presented the failure evaluation model by experimental research on electrical breakdown characteristics of oil-paper insulation under AC, DC and AC-DC combined voltages. Both short-time tests and constant-stress tests were carried out when the insulation system was subjected to different applied voltages. The breakdown strength and times-to-breakdown of oil-paper specimens have been investigated by tests. The inverse power model was presented by the weibull parameters which were estimated by the times-to-breakdown of specimens. Using the parameters of weibull model and inverse power model, the functions of failure evaluation model were calculated. It could establish the relationship between times, voltages and failure probability of insulation. And final evaluation results showed it was more effective than tradition failure model and weibull model. The DC component behavior in the insulation system has been analyzed and the influence of AC-DC combined voltages on insulation system was discussed.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"36 1","pages":"396-399"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89663608","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357012
A. Jiang, Z. Fu, Junfeng Li
Lightning strike is still an important threaten to the safety operation of UHV transmission lines. As a traditional method for lightning accident and lightning current investigation, the magnetic steel rod method had been widely used in high voltage transmission lines. Lightning rods were often raised up on transmission line towers and then the magnetic steel rods were installed around it for the purpose to get an idea environment for the installation of magnetic steel rod and relatively accurate measurement of the lightning current. For the application of the magnetic steel rod method on UHV transmission lines, this paper proposed a practical and easy method of installing the magnetic steel rods directly on the transmission towers' angle steel structures and fittings, which do not need to install lightning rods on the towers. Preliminary application results of the proposed method on the demonstrating and testing UHV transmission line is presented. The obtained datasets after one storm season was analyzed. It is shown that the proposed method is feasible.
{"title":"Investigation of lightning strokes to UHV transmission lines by improved magnetic steel rod method","authors":"A. Jiang, Z. Fu, Junfeng Li","doi":"10.1109/ICHVE.2012.6357012","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357012","url":null,"abstract":"Lightning strike is still an important threaten to the safety operation of UHV transmission lines. As a traditional method for lightning accident and lightning current investigation, the magnetic steel rod method had been widely used in high voltage transmission lines. Lightning rods were often raised up on transmission line towers and then the magnetic steel rods were installed around it for the purpose to get an idea environment for the installation of magnetic steel rod and relatively accurate measurement of the lightning current. For the application of the magnetic steel rod method on UHV transmission lines, this paper proposed a practical and easy method of installing the magnetic steel rods directly on the transmission towers' angle steel structures and fittings, which do not need to install lightning rods on the towers. Preliminary application results of the proposed method on the demonstrating and testing UHV transmission line is presented. The obtained datasets after one storm season was analyzed. It is shown that the proposed method is feasible.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"48 1","pages":"123-127"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85793775","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357122
R. Luo, M. Zhong, Y. Long, C. Yao, Y. Mi
In a high voltage power system, it is hard to measure directly and expediently the lightning currents accurately and safely. So aiming at solving the problem of accurate and safe measurement of the lightning current on the overhead transmission lines, a novel lightning current monitor system based on differential loop which has been widely used in the pulse power measurement technique is applied, which can measure the lightning current on overhead transmission lines contactlessly considering the actual running conditions in the 110kV level of transmission line. In this essay, the principle of the sensor for measuring lightning current and the design of the whole monitor system structure are introduced. In laboratory by using the high impulse current generator to simulate the lightning currents, the experiment results show that: for the 1.4m measured distance, through adjusting the sensor parameters and choosing reasonable shielding, the lightning current monitor system can collect the data of the high impulse currents accurately and completely, and the monitor system has the advantage of safety, strong anti-interference, endurance and accuracy.
{"title":"Novel lightning current monitor system based on the differential loop for 110kV transmission line","authors":"R. Luo, M. Zhong, Y. Long, C. Yao, Y. Mi","doi":"10.1109/ICHVE.2012.6357122","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357122","url":null,"abstract":"In a high voltage power system, it is hard to measure directly and expediently the lightning currents accurately and safely. So aiming at solving the problem of accurate and safe measurement of the lightning current on the overhead transmission lines, a novel lightning current monitor system based on differential loop which has been widely used in the pulse power measurement technique is applied, which can measure the lightning current on overhead transmission lines contactlessly considering the actual running conditions in the 110kV level of transmission line. In this essay, the principle of the sensor for measuring lightning current and the design of the whole monitor system structure are introduced. In laboratory by using the high impulse current generator to simulate the lightning currents, the experiment results show that: for the 1.4m measured distance, through adjusting the sensor parameters and choosing reasonable shielding, the lightning current monitor system can collect the data of the high impulse currents accurately and completely, and the monitor system has the advantage of safety, strong anti-interference, endurance and accuracy.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"28 1","pages":"339-342"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82577287","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 : 2012-11-26DOI: 10.1109/ICHVE.2012.6357058
Z. Long, N. Younan, T. O. Bialek
Fault detection in underground power cables can be accomplished by examining voltage and current signals using signal processing techniques. In this paper, we explore the feasibility of applying complex wavelet analysis to fault detection. We combine complex wavelets with continuous wavelet transform (CWT), and calculate the impedance from the voltage and current data in the wavelet domain. We then examine the magnitude and phase distributions of the impedance under various conditions. We test our analysis approach with measurement data from different types of cables. The results show that the complex wavelet analysis based approach is able to provide unique signatures for distinguishing between the cables, thus very promising for fault detection.
{"title":"Underground power cable fault detection using complex wavelet analysis","authors":"Z. Long, N. Younan, T. O. Bialek","doi":"10.1109/ICHVE.2012.6357058","DOIUrl":"https://doi.org/10.1109/ICHVE.2012.6357058","url":null,"abstract":"Fault detection in underground power cables can be accomplished by examining voltage and current signals using signal processing techniques. In this paper, we explore the feasibility of applying complex wavelet analysis to fault detection. We combine complex wavelets with continuous wavelet transform (CWT), and calculate the impedance from the voltage and current data in the wavelet domain. We then examine the magnitude and phase distributions of the impedance under various conditions. We test our analysis approach with measurement data from different types of cables. The results show that the complex wavelet analysis based approach is able to provide unique signatures for distinguishing between the cables, thus very promising for fault detection.","PeriodicalId":6375,"journal":{"name":"2012 International Conference on High Voltage Engineering and Application","volume":"31 1","pages":"59-62"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78985312","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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