Pub Date : 2016-09-01DOI: 10.1109/ICLP.2016.7791435
Zulkifli bin Burhanuddin, C. Gomes, Ashen Gomes, M. A. Ab. Kadir, W. Ahmad, N. Azis
Fulgurites are natural tubes of glass formed by the fusion of silica sand or rock from a lightning strike. The fulgurites have been produced artificially in HV conditions in the past. Recent studies have found that fulguritic structures can be formed in some other materials, such as bentonite and cement, as well. These fulgurites can change the overall physical and electrical properties of the original materials. Thus, formation of fulgurites can modify the performance of electrical earthing systems, both ordinary and those improvised with backfill materials. This study investigates the fulgurite formation under alternating, direct and impulse current application. Bentonite and sand were tested under high voltage conditions. The type of fulgurites and their effects on electrical earthing systems were studied by analyzing the resistivity and permittivity of original materials and fulgurites. It has been found that fulgurites formation has a severe effect on the earth resistance of grounding systems.
{"title":"Characteristics of fulgurite-like structures under HV conditions: Effects on electrical earthing systems","authors":"Zulkifli bin Burhanuddin, C. Gomes, Ashen Gomes, M. A. Ab. Kadir, W. Ahmad, N. Azis","doi":"10.1109/ICLP.2016.7791435","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791435","url":null,"abstract":"Fulgurites are natural tubes of glass formed by the fusion of silica sand or rock from a lightning strike. The fulgurites have been produced artificially in HV conditions in the past. Recent studies have found that fulguritic structures can be formed in some other materials, such as bentonite and cement, as well. These fulgurites can change the overall physical and electrical properties of the original materials. Thus, formation of fulgurites can modify the performance of electrical earthing systems, both ordinary and those improvised with backfill materials. This study investigates the fulgurite formation under alternating, direct and impulse current application. Bentonite and sand were tested under high voltage conditions. The type of fulgurites and their effects on electrical earthing systems were studied by analyzing the resistivity and permittivity of original materials and fulgurites. It has been found that fulgurites formation has a severe effect on the earth resistance of grounding systems.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116117281","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791516
A. Tatematsu, Ken’ichi Yamazaki, Hirokazu Matsumoto
In electric power systems, microwave relay stations are employed to exchange information using electromagnetic radio waves to control the systems. Some microwave relay stations are built on tops of mountains, which causes a high incidence of lightning strikes to microwave towers, and the lightning strikes may result in disturbances of microwave radio equipment. To protect microwave radio equipment from lightning, it is required to analyze surge phenomena in microwave relay stations and evaluate the effectiveness of lightning protection methodologies. Nowadays, the finite-difference time-domain (FDTD) method to solve Maxwell's equations directly, has been widely and successfully applied to the surge analysis of three-dimensional structures and grounding structures. In this study, setting up a reduced-scale microwave relay station model with a microwave tower of 10 m height, we calculate the distribution of lightning impulse currents in the model and compare the calculated results with measured ones for validation. Secondly, we calculate the magnetic fields inside the microwave relay station in the case of direct lightning strikes to the microwave tower to study the effect of the layout of the microwave relay station and the effectiveness of the reinforcing bars used for grounding.
{"title":"FDTD-based lightning surge simulation of a microwave relay station","authors":"A. Tatematsu, Ken’ichi Yamazaki, Hirokazu Matsumoto","doi":"10.1109/ICLP.2016.7791516","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791516","url":null,"abstract":"In electric power systems, microwave relay stations are employed to exchange information using electromagnetic radio waves to control the systems. Some microwave relay stations are built on tops of mountains, which causes a high incidence of lightning strikes to microwave towers, and the lightning strikes may result in disturbances of microwave radio equipment. To protect microwave radio equipment from lightning, it is required to analyze surge phenomena in microwave relay stations and evaluate the effectiveness of lightning protection methodologies. Nowadays, the finite-difference time-domain (FDTD) method to solve Maxwell's equations directly, has been widely and successfully applied to the surge analysis of three-dimensional structures and grounding structures. In this study, setting up a reduced-scale microwave relay station model with a microwave tower of 10 m height, we calculate the distribution of lightning impulse currents in the model and compare the calculated results with measured ones for validation. Secondly, we calculate the magnetic fields inside the microwave relay station in the case of direct lightning strikes to the microwave tower to study the effect of the layout of the microwave relay station and the effectiveness of the reinforcing bars used for grounding.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125843545","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791405
M. Hajikhani, M. Ab-Kadir, M. Izadi, C. Gomes, J. Jasni
This study examined the risk of lightning-related deaths and injuries in Malaysia between January of 2008 to July 2015. The majority of lightning-related injuries and fatalities occurred during the months of April and May. Most lightning related casualties reported in the statistics since 2008 occurred in the states of Melaka and Selangor in the western coastal belt. The majority of victims, were engaged in outdoor and sports activities when injured or killed by lightning incidents.
{"title":"Lightning fatalities and injuries in Malaysia from 2008 to 2015","authors":"M. Hajikhani, M. Ab-Kadir, M. Izadi, C. Gomes, J. Jasni","doi":"10.1109/ICLP.2016.7791405","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791405","url":null,"abstract":"This study examined the risk of lightning-related deaths and injuries in Malaysia between January of 2008 to July 2015. The majority of lightning-related injuries and fatalities occurred during the months of April and May. Most lightning related casualties reported in the statistics since 2008 occurred in the states of Melaka and Selangor in the western coastal belt. The majority of victims, were engaged in outdoor and sports activities when injured or killed by lightning incidents.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124680554","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791421
N. H. Zaini, M. Ab-Kadir, M. Izadi, N. I. Ahmad, M. Radzi, N. Azis, W. Z. W. Hasan
A solar PV system was modelled and the effect of lightning striking different parts of a solar PV system was studied and the results discussed appropriately. Lightning strikes of different wave shapes and different magnitudes were considered. The purpose of this research is to observe the transient current and voltage that appears in a solar PV system when struck by lightning. The results show that a transient current will appear at the nearest point to the lightning strike and the value of the transient current is same as the lightning current, while the transient voltage will appear at AC side at any point of lightning strike. This could damage the inverter which requires a high cost to repair or replace. The information of this paper can be useful to decide a suitable lightning protection system before installing a solar PV system.
{"title":"On the effect of lightning on a solar photovoltaic system","authors":"N. H. Zaini, M. Ab-Kadir, M. Izadi, N. I. Ahmad, M. Radzi, N. Azis, W. Z. W. Hasan","doi":"10.1109/ICLP.2016.7791421","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791421","url":null,"abstract":"A solar PV system was modelled and the effect of lightning striking different parts of a solar PV system was studied and the results discussed appropriately. Lightning strikes of different wave shapes and different magnitudes were considered. The purpose of this research is to observe the transient current and voltage that appears in a solar PV system when struck by lightning. The results show that a transient current will appear at the nearest point to the lightning strike and the value of the transient current is same as the lightning current, while the transient voltage will appear at AC side at any point of lightning strike. This could damage the inverter which requires a high cost to repair or replace. The information of this paper can be useful to decide a suitable lightning protection system before installing a solar PV system.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126190003","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791452
Oleksii Bondar, V. Shostak, Thomas Smatloch
Results on numerical simulation (NS) of lightning current distribution in components of round standing seam cladding structure are presented. NS was performed by using 3D models of two types: large-scale model (#1), better reproducing conditions for current distribution in natural cladding; small model (#2), reproducing the sample for laboratory tests. Analysis included cases related to injection of lightning current having different standard waveforms (approximations) and variation of some parameters (halter's fastening contact area, channel radius and length). Scaling effects on using small test samples are addressed and recommendations for selection of adequate current parameters during tests are provided. In particular, in approach of equivalent frequency, for impulse waveform 10/350 μs and basic dimensions of the cladding components, current magnitude portion distributed into main halter (under the strike point) for the small model #2 (13.5 %) is obtained about twice bigger than that for the large one #1 (7 %). For continuous current, corresponding current portions are almost identical for both models: #1 - 45%, #2 - 43.5%. More accurate proportions of possible magnitude correction can be determined in further studies by considering closer waveform approximation and tests.
{"title":"Lightning current distribution in the components of cladding structure","authors":"Oleksii Bondar, V. Shostak, Thomas Smatloch","doi":"10.1109/ICLP.2016.7791452","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791452","url":null,"abstract":"Results on numerical simulation (NS) of lightning current distribution in components of round standing seam cladding structure are presented. NS was performed by using 3D models of two types: large-scale model (#1), better reproducing conditions for current distribution in natural cladding; small model (#2), reproducing the sample for laboratory tests. Analysis included cases related to injection of lightning current having different standard waveforms (approximations) and variation of some parameters (halter's fastening contact area, channel radius and length). Scaling effects on using small test samples are addressed and recommendations for selection of adequate current parameters during tests are provided. In particular, in approach of equivalent frequency, for impulse waveform 10/350 μs and basic dimensions of the cladding components, current magnitude portion distributed into main halter (under the strike point) for the small model #2 (13.5 %) is obtained about twice bigger than that for the large one #1 (7 %). For continuous current, corresponding current portions are almost identical for both models: #1 - 45%, #2 - 43.5%. More accurate proportions of possible magnitude correction can be determined in further studies by considering closer waveform approximation and tests.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130420268","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791502
T. H. Thang, Y. Baba, N. Itamoto, V. Rakov
In this paper, we have simulated back-flashover at transmission line tower struck by lightning in the presence of corona emanated at the ground wire. In the simulations, three two-circuit 60-m high towers, separated by 400 m, with two overhead ground wires, and six phase conductors (two three-phase circuits) are employed. A simplified (engineering) model of corona discharge is applied to the analysis of transient voltages across insulators of transmission line. Back-flashover is assumed to occur at upper-, middle-, or lower phase. On the basis of computed results, the effect of corona space charge emanated from ground wires on transient voltages across insulators in the presence of back-flashover is discussed.
{"title":"FDTD simulation of back-flashover at the transmission-line tower struck by lightning considering ground-wire corona","authors":"T. H. Thang, Y. Baba, N. Itamoto, V. Rakov","doi":"10.1109/ICLP.2016.7791502","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791502","url":null,"abstract":"In this paper, we have simulated back-flashover at transmission line tower struck by lightning in the presence of corona emanated at the ground wire. In the simulations, three two-circuit 60-m high towers, separated by 400 m, with two overhead ground wires, and six phase conductors (two three-phase circuits) are employed. A simplified (engineering) model of corona discharge is applied to the analysis of transient voltages across insulators of transmission line. Back-flashover is assumed to occur at upper-, middle-, or lower phase. On the basis of computed results, the effect of corona space charge emanated from ground wires on transient voltages across insulators in the presence of back-flashover is discussed.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129412909","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791365
M. Stock, Ting Wu, Y. Akiyama, T. Ushio, Z. Kawasaki, Y. Nakamura
The Broadband Observational network for Lightning and Thunderstorms (BOLT) is a network of low frequency electric field antennas which is capable of mapping lightning flashes in 3D. We are currently investigating improvements to both the hardware design of the BOLT antennas, and to the algorithm used to determine each lightning source location. The antenna revision increases the sensitivity of the antenna to frequencies most beneficial to lightning location. The processing algorithm improvements have increased the number of lightning sources located, and produce 3D maps of sufficient quality for charge analysis.
{"title":"Improvements to the BOLT lightning location system","authors":"M. Stock, Ting Wu, Y. Akiyama, T. Ushio, Z. Kawasaki, Y. Nakamura","doi":"10.1109/ICLP.2016.7791365","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791365","url":null,"abstract":"The Broadband Observational network for Lightning and Thunderstorms (BOLT) is a network of low frequency electric field antennas which is capable of mapping lightning flashes in 3D. We are currently investigating improvements to both the hardware design of the BOLT antennas, and to the algorithm used to determine each lightning source location. The antenna revision increases the sensitivity of the antenna to frequencies most beneficial to lightning location. The processing algorithm improvements have increased the number of lightning sources located, and produce 3D maps of sufficient quality for charge analysis.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126594718","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791377
Christopher Zumbika, E. Trengove, K. Nixon
This paper presents the results of a preliminary study of lightning activity around eMalahleni, a South African town which is surrounded by an estimated 160 mines and 13 coal power plants. This area also falls within one of most polluted regions of South Africa with recorded particulate matter (PMio) concentrations of about 80 μgm-3 between 2009 and 2012. Cloud to ground (CG) lightning flash data from the South African Lightning Detection Network (SALDN) for 2013 was used to calculate the spatial distribution of overall flash density, positive flash density and average multiplicity in the region within a 250 km radius of eMalahleni. A total of 1127186 CG flashes were recorded in the area in 2013. The highest average flash densities in excess of 12 flashes/km2/year were observed over the regions that are part of the Drakensberg escarpment. Flash densities ranging between 6 and 12 flashes/km2/ year were also observed near some of the mines that are not on the Drakensberg escarpment. Positive flash densities less than 1 flash/km2/year were observed near mines and power stations compared to flash densities greater than 1 flash/km2/year observed elsewhere. This might be an indicator that both elevation and mining activities are affecting CG lightning activity in this region. However, more data analysis needs to be conducted before conclusions can be drawn on the effects of mining and elevation on lightning activity in the region.
{"title":"A preliminary assessment of lightning activity around a South African mining town, eMalahleni","authors":"Christopher Zumbika, E. Trengove, K. Nixon","doi":"10.1109/ICLP.2016.7791377","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791377","url":null,"abstract":"This paper presents the results of a preliminary study of lightning activity around eMalahleni, a South African town which is surrounded by an estimated 160 mines and 13 coal power plants. This area also falls within one of most polluted regions of South Africa with recorded particulate matter (PMio) concentrations of about 80 μgm-3 between 2009 and 2012. Cloud to ground (CG) lightning flash data from the South African Lightning Detection Network (SALDN) for 2013 was used to calculate the spatial distribution of overall flash density, positive flash density and average multiplicity in the region within a 250 km radius of eMalahleni. A total of 1127186 CG flashes were recorded in the area in 2013. The highest average flash densities in excess of 12 flashes/km2/year were observed over the regions that are part of the Drakensberg escarpment. Flash densities ranging between 6 and 12 flashes/km2/ year were also observed near some of the mines that are not on the Drakensberg escarpment. Positive flash densities less than 1 flash/km2/year were observed near mines and power stations compared to flash densities greater than 1 flash/km2/year observed elsewhere. This might be an indicator that both elevation and mining activities are affecting CG lightning activity in this region. However, more data analysis needs to be conducted before conclusions can be drawn on the effects of mining and elevation on lightning activity in the region.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127628651","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791342
N. Filipe, C. Cardoso, João Mendes, A. Leiria, D.M. Duarte, Luís Perro, M. Matos Fernandes
This paper describes the application of a Monte Carlo statistical method to evaluate the lightning performance of transmission lines. Monte Carlo routines were developed in Matlab software, to conduct calculation of transients in EMTP-RV-RV, using custom Electro-Geometric Model and acceleration algorithms. The main goal of this paper is to increase the accuracy of flashover rates calculation through the accurate modelling of network components, simulation of non-vertical strokes and lightning current calculation from the LLS data for the region where the line passes. The methodology was validated with Portuguese typical transmission line configurations, by comparing simulated and actual performance indexes. The use of the EGM model with non-vertical strokes and LLS data was also validated.
{"title":"A methodology for estimating transmission lines lightning performance using a statistical approach","authors":"N. Filipe, C. Cardoso, João Mendes, A. Leiria, D.M. Duarte, Luís Perro, M. Matos Fernandes","doi":"10.1109/ICLP.2016.7791342","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791342","url":null,"abstract":"This paper describes the application of a Monte Carlo statistical method to evaluate the lightning performance of transmission lines. Monte Carlo routines were developed in Matlab software, to conduct calculation of transients in EMTP-RV-RV, using custom Electro-Geometric Model and acceleration algorithms. The main goal of this paper is to increase the accuracy of flashover rates calculation through the accurate modelling of network components, simulation of non-vertical strokes and lightning current calculation from the LLS data for the region where the line passes. The methodology was validated with Portuguese typical transmission line configurations, by comparing simulated and actual performance indexes. The use of the EGM model with non-vertical strokes and LLS data was also validated.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127996396","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 : 2016-09-01DOI: 10.1109/ICLP.2016.7791340
M. Iwata, T. Ohtaka, Y. Goda
Metal strands of OPGWs (composite fiber-optic ground wires) are sometimes melted and broken by high-energy lightning strikes. DC arc tests simulating lightning strikes have thus been performed to obtain their melting and breaking characteristics. In this paper, to clarify the characteristics of thin OPGWs, experiments and calculations on the melting and breaking of 80 mm2 OPGWs were performed for different strand types (23AC, 30AC). The calculated dependence of the flowing electric charge required for three strands to break on the strand type shows good agreement with the experimental values obtained in DC arc tests simulating a lightning strike.
{"title":"Melting and breaking of 80 mm2 OPGWs by DC arc discharge simulating lightning strike","authors":"M. Iwata, T. Ohtaka, Y. Goda","doi":"10.1109/ICLP.2016.7791340","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791340","url":null,"abstract":"Metal strands of OPGWs (composite fiber-optic ground wires) are sometimes melted and broken by high-energy lightning strikes. DC arc tests simulating lightning strikes have thus been performed to obtain their melting and breaking characteristics. In this paper, to clarify the characteristics of thin OPGWs, experiments and calculations on the melting and breaking of 80 mm2 OPGWs were performed for different strand types (23AC, 30AC). The calculated dependence of the flowing electric charge required for three strands to break on the strand type shows good agreement with the experimental values obtained in DC arc tests simulating a lightning strike.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128017133","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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