Pub Date : 2015-09-01DOI: 10.1109/SIPDA.2015.7339318
A. DaSilva, Rodrigo K. Enjiu
There are many records of people and animals victims of lightning while under trees in the thunderstorms. However, there are fewer studies that model cases where lightning strikes a tree and the ground current reaches people far from the trees. This paper offers a case study based on a lightning strike to a tree that injured 31 people sheltering in a nearby masonry building, and presents a simulation model of the event that offers insight into the propagation.
{"title":"Lightning on tree: Modeling a case study in Brasilia, Brazil","authors":"A. DaSilva, Rodrigo K. Enjiu","doi":"10.1109/SIPDA.2015.7339318","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339318","url":null,"abstract":"There are many records of people and animals victims of lightning while under trees in the thunderstorms. However, there are fewer studies that model cases where lightning strikes a tree and the ground current reaches people far from the trees. This paper offers a case study based on a lightning strike to a tree that injured 31 people sheltering in a nearby masonry building, and presents a simulation model of the event that offers insight into the propagation.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131838645","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339310
Lucas Carvalho, N. M. da Silva, N. Fedorova, V. Levit
Synoptic and thermodynamic analysis of 14 thunderstorm events in the Alagoas State (Northern Brazil) was elaborated. Thermodynamic analysis was based on the vertical profiles, forecasted with 48 hours in advance. Forecast was made by the air parcel trajectories from the HYSPLIT model in 10 standard levels. Instability indexes were applied in order to better evaluate the quality of the vertical profiles. It was considered the topography influences on the intensification of the thunderstorms. That was made by evaluation of the Potential and Latent Instabilities (IP and IL), for each case. An analysis of two events on April 6, 2014 was presented in details. The following data were used: (1) Brazilian Meteorological Department (REDEMET); (2) Tropical Rainfall Measuring Mission (TRMM); (3) Reanalysis data from The European Centre for Medium-Range Weather Forecasts (ECMWF) and (4) National Centers for Environmental Prediction (NCEP); Sounding and GOES and METEOSAT satellite images from (5) Brazilian Forecast and Climate Study Center (CPTEC); (6) HYSPLIT model; (7) The Environment and Water Resources Department of Alagoas (SEMARH); (8) Planning and Economic Developing Department of Alagoas (SEPLANDE), The Forecasted profiles were satisfactory up to 48h in advance. The IP and IL were responsible for an increase of the CAPE+ of 2.7 times. It was identified an influence of the ITCZ, which was located to the South of the climatological location, because of a cold front nearby. Strong trough over the South Atlantic at the high levels was associated with the thunderstorm development.
{"title":"Synoptic and thermodynamic analysis of thunderstorms events in the Alagoas State, the Northeast Brazil","authors":"Lucas Carvalho, N. M. da Silva, N. Fedorova, V. Levit","doi":"10.1109/SIPDA.2015.7339310","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339310","url":null,"abstract":"Synoptic and thermodynamic analysis of 14 thunderstorm events in the Alagoas State (Northern Brazil) was elaborated. Thermodynamic analysis was based on the vertical profiles, forecasted with 48 hours in advance. Forecast was made by the air parcel trajectories from the HYSPLIT model in 10 standard levels. Instability indexes were applied in order to better evaluate the quality of the vertical profiles. It was considered the topography influences on the intensification of the thunderstorms. That was made by evaluation of the Potential and Latent Instabilities (IP and IL), for each case. An analysis of two events on April 6, 2014 was presented in details. The following data were used: (1) Brazilian Meteorological Department (REDEMET); (2) Tropical Rainfall Measuring Mission (TRMM); (3) Reanalysis data from The European Centre for Medium-Range Weather Forecasts (ECMWF) and (4) National Centers for Environmental Prediction (NCEP); Sounding and GOES and METEOSAT satellite images from (5) Brazilian Forecast and Climate Study Center (CPTEC); (6) HYSPLIT model; (7) The Environment and Water Resources Department of Alagoas (SEMARH); (8) Planning and Economic Developing Department of Alagoas (SEPLANDE), The Forecasted profiles were satisfactory up to 48h in advance. The IP and IL were responsible for an increase of the CAPE+ of 2.7 times. It was identified an influence of the ITCZ, which was located to the South of the climatological location, because of a cold front nearby. Strong trough over the South Atlantic at the high levels was associated with the thunderstorm development.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130298627","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339338
W. Chisholm, Susana de Almeida de Graaff
Risk estimates for lightning faults make use of log-normal distributions for lightning characteristics such as peak current. Simplifications for highly correlated parameters, notably peak current and rate of current rise, justify use of equivalent front time of 2 μs in backflashover calculations for first negative return strokes. The transmission line backflashover rate is also affected by uncorrelated and broad statistical variations in soil resistivity, tower footing impedance Zf and resistance Rf. Statistical properties of Rf from transmission lines in Tennessee USA and Portugal are compared. Modeling of Rf variation using a ten-step distribution from the IEEE Standard 1243 FLASH program is compared with estimates using finer probability step intervals, log-normal and log-logistic models.
{"title":"Adapting the statistics of soil properties into existing and future lightning protection standards and guides","authors":"W. Chisholm, Susana de Almeida de Graaff","doi":"10.1109/SIPDA.2015.7339338","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339338","url":null,"abstract":"Risk estimates for lightning faults make use of log-normal distributions for lightning characteristics such as peak current. Simplifications for highly correlated parameters, notably peak current and rate of current rise, justify use of equivalent front time of 2 μs in backflashover calculations for first negative return strokes. The transmission line backflashover rate is also affected by uncorrelated and broad statistical variations in soil resistivity, tower footing impedance Zf and resistance Rf. Statistical properties of Rf from transmission lines in Tennessee USA and Portugal are compared. Modeling of Rf variation using a ten-step distribution from the IEEE Standard 1243 FLASH program is compared with estimates using finer probability step intervals, log-normal and log-logistic models.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133316971","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339304
D. A. da Silva, R. C. de Jesus, J. Pissolato, K. Lahti
In order to evaluate if metal oxide surge arrester present any partial discharge (PD) in case of internal moisture and how applicable it is as a condition monitoring diagnostic method, 8 distribution class (Ucov = 20 kV) metal oxide surge arresters (6 silicone housed and 2 Ethylen-Vinylacetate (EVA) housed) from four different manufacturers (A, B, C and D) were submitted to an immersion test for 19 days. The partial discharge and leakage current levels were measured daily. Parameters like largest repeatedly occurring PD magnitude, discharge current and PD repetition rate were recorded for later comparison with power loss calculated from the leakage current. In some of the arresters internal moisture was noticed, however, partial discharge measurement was not as sensitive as power loss. For those samples identified with internal moisture, the partial discharge activity showed a special behavior keeping a limited amplitude itself but presenting a high repetition rate.
{"title":"Partial discharge activity in distribution MOSAs due to internal moisture","authors":"D. A. da Silva, R. C. de Jesus, J. Pissolato, K. Lahti","doi":"10.1109/SIPDA.2015.7339304","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339304","url":null,"abstract":"In order to evaluate if metal oxide surge arrester present any partial discharge (PD) in case of internal moisture and how applicable it is as a condition monitoring diagnostic method, 8 distribution class (Ucov = 20 kV) metal oxide surge arresters (6 silicone housed and 2 Ethylen-Vinylacetate (EVA) housed) from four different manufacturers (A, B, C and D) were submitted to an immersion test for 19 days. The partial discharge and leakage current levels were measured daily. Parameters like largest repeatedly occurring PD magnitude, discharge current and PD repetition rate were recorded for later comparison with power loss calculated from the leakage current. In some of the arresters internal moisture was noticed, however, partial discharge measurement was not as sensitive as power loss. For those samples identified with internal moisture, the partial discharge activity showed a special behavior keeping a limited amplitude itself but presenting a high repetition rate.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124374774","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339293
I. M. Rawi, Mohd Zainal Abidin Ab Kadir
The Transmission Division of Tenaga Nasional Berhad (TNB) manages and operates transmission system ranges from 66kV up to 500kV in Peninsular Malaysia. Being in tropical country with high keraunic level, system outages due to lightning strikes has become major issue each year. This paper present the findings of an investigation on a series of lightning-related flashovers which occurs on the 132kV Kuala Krai (KKRJ) to Gua Musang (GMSG) line in Malaysia. Lightning activities were recorded by Lightning Detection System (LDS) during the flashover occurrence and it was analyzed. Possible cause of failures which are related to Transmission Line Arrester (TLA) installation and Tower Footing Resistance (TFR) were explained to conclude the multiple numbers of tripouts on the line. Suggestions to increase the performance of the line are also discussed.
{"title":"Investigation on the 132kV overhead lines lightning-related flashovers in Malaysia","authors":"I. M. Rawi, Mohd Zainal Abidin Ab Kadir","doi":"10.1109/SIPDA.2015.7339293","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339293","url":null,"abstract":"The Transmission Division of Tenaga Nasional Berhad (TNB) manages and operates transmission system ranges from 66kV up to 500kV in Peninsular Malaysia. Being in tropical country with high keraunic level, system outages due to lightning strikes has become major issue each year. This paper present the findings of an investigation on a series of lightning-related flashovers which occurs on the 132kV Kuala Krai (KKRJ) to Gua Musang (GMSG) line in Malaysia. Lightning activities were recorded by Lightning Detection System (LDS) during the flashover occurrence and it was analyzed. Possible cause of failures which are related to Transmission Line Arrester (TLA) installation and Tower Footing Resistance (TFR) were explained to conclude the multiple numbers of tripouts on the line. Suggestions to increase the performance of the line are also discussed.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132335896","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339330
M. Shigihara, A. Piantini, M. C. G. Ramos, C. P. Braz, C. Mazzetti, A. Ancajima
This paper presents a novel method to estimate the parameters of the Disruptive Effect Model for the prediction of the volt-time curves of medium voltage (MV) insulators. Two non-standard impulse voltage waveshapes, of both polarities, were adopted in the tests, namely 1.2 / 10 μs and 7.5 / 30 μs. The measured volt-time characteristics of a 15 kV class pin-type insulator were compared with those predicted by four different procedures related to the Disruptive Effect Model: Darveniza and Vlastos; Hileman; Ancajima et al., and the one proposed in this paper. The results show that the methods by Darveniza and Vlastos and by Hileman do not predict insulator breakdown for the lower peak voltage levels of the 1.2/10 μs waveshape of both polarities. On the other hand, a relative good agreement is found between theoretical and experimental results for the calculations performed using the method proposed in this paper and the one by Ancajima et al.
{"title":"A proposal for the prediction of the volt-time curves of MV insulators based on the Disruptive Effect Model","authors":"M. Shigihara, A. Piantini, M. C. G. Ramos, C. P. Braz, C. Mazzetti, A. Ancajima","doi":"10.1109/SIPDA.2015.7339330","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339330","url":null,"abstract":"This paper presents a novel method to estimate the parameters of the Disruptive Effect Model for the prediction of the volt-time curves of medium voltage (MV) insulators. Two non-standard impulse voltage waveshapes, of both polarities, were adopted in the tests, namely 1.2 / 10 μs and 7.5 / 30 μs. The measured volt-time characteristics of a 15 kV class pin-type insulator were compared with those predicted by four different procedures related to the Disruptive Effect Model: Darveniza and Vlastos; Hileman; Ancajima et al., and the one proposed in this paper. The results show that the methods by Darveniza and Vlastos and by Hileman do not predict insulator breakdown for the lower peak voltage levels of the 1.2/10 μs waveshape of both polarities. On the other hand, a relative good agreement is found between theoretical and experimental results for the calculations performed using the method proposed in this paper and the one by Ancajima et al.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128751417","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339296
Mengni Long, M. B. Garcia, R. Thottappillil
This paper presents the numerical evaluation of the propagation of positive upward connecting leaders under the influence of lightning dart leaders. The simulation is performed with the self-consistent leader inception and propagation model - SLIM-. An analytical expression is derived for calculating the charge per unit length required to thermalize a new upward leader segment. The simulation is validated with two dart leader attachment events in a lightning triggering experiment reported in the literature. Good agreement between the estimations and the measurements of dart leader interception in length, duration and velocity of upward leader propagation has been found. Further analysis is carried out on dart lightning leader interception.
{"title":"On the simulation of the interception of lightning dart leaders","authors":"Mengni Long, M. B. Garcia, R. Thottappillil","doi":"10.1109/SIPDA.2015.7339296","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339296","url":null,"abstract":"This paper presents the numerical evaluation of the propagation of positive upward connecting leaders under the influence of lightning dart leaders. The simulation is performed with the self-consistent leader inception and propagation model - SLIM-. An analytical expression is derived for calculating the charge per unit length required to thermalize a new upward leader segment. The simulation is validated with two dart leader attachment events in a lightning triggering experiment reported in the literature. Good agreement between the estimations and the measurements of dart leader interception in length, duration and velocity of upward leader propagation has been found. Further analysis is carried out on dart lightning leader interception.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"442 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116746804","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339270
M. Araújo, R. Flauzino, O. E. Batista, L. Moraes
Induced voltages by indirect lightning cause faults, damage to equipment and malfunctions to electric power systems, compromising the quality, continuity and reliability of the electrical energy supply. In this context, research development is crucial to improve lightning protection procedures, especially for electrical systems located in areas with high ground flash densities. This article presents the results of the application of a practical procedure for protection of the IEEE 13 Node Test Feeder against induced voltages by indirect lightning simulated with the Rusck model employing metal-oxide surge arresters. The results demonstrate the efficiency and practicality of the presented procedure regarding the technical specification and definition of the best allocation and amount of surge arresters for feeder protection, as well as the analysis of the sensitivity of the transformers and load facing the induced voltages.
{"title":"Procedure for protection of distribution feeder against induced voltages by indirect lightning","authors":"M. Araújo, R. Flauzino, O. E. Batista, L. Moraes","doi":"10.1109/SIPDA.2015.7339270","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339270","url":null,"abstract":"Induced voltages by indirect lightning cause faults, damage to equipment and malfunctions to electric power systems, compromising the quality, continuity and reliability of the electrical energy supply. In this context, research development is crucial to improve lightning protection procedures, especially for electrical systems located in areas with high ground flash densities. This article presents the results of the application of a practical procedure for protection of the IEEE 13 Node Test Feeder against induced voltages by indirect lightning simulated with the Rusck model employing metal-oxide surge arresters. The results demonstrate the efficiency and practicality of the presented procedure regarding the technical specification and definition of the best allocation and amount of surge arresters for feeder protection, as well as the analysis of the sensitivity of the transformers and load facing the induced voltages.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133839653","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339327
A. Rousseau, Celine Sainte-Rose-Fanchine, M. Guthrie
The 2nd edition of the lightning risk assessment standard (IEC 62305-2) considers structures which may endanger the environment. In these cases, the loss is not limited to the structure itself; which is the case for “usual” structures. In Edition 1 of the standard this danger was simply taken into account by multiplying the calculated risk for the structure by a special hazard factor. In Edition 2, the calculated risk for the structure itself is added to another risk associated with the losses outside of the structure. The losses outside can be treated independently from what occurs inside. This is a major advantage in the analysis of the risk for sensitive structures such as chemical plants, nuclear plants, or structures containing explosives, etc. Edition 3 of the standard is currently under preparation. It is important to better define what the environmental risk really is and how it can be calculated efficiently. A methodology proposed in previous publications has been adapted to real cases already studied with Edition 1 of IEC 62305-2 for comparison.
{"title":"Application of environmental risk according to IEC 62305-2 Edition 2","authors":"A. Rousseau, Celine Sainte-Rose-Fanchine, M. Guthrie","doi":"10.1109/SIPDA.2015.7339327","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339327","url":null,"abstract":"The 2nd edition of the lightning risk assessment standard (IEC 62305-2) considers structures which may endanger the environment. In these cases, the loss is not limited to the structure itself; which is the case for “usual” structures. In Edition 1 of the standard this danger was simply taken into account by multiplying the calculated risk for the structure by a special hazard factor. In Edition 2, the calculated risk for the structure itself is added to another risk associated with the losses outside of the structure. The losses outside can be treated independently from what occurs inside. This is a major advantage in the analysis of the risk for sensitive structures such as chemical plants, nuclear plants, or structures containing explosives, etc. Edition 3 of the standard is currently under preparation. It is important to better define what the environmental risk really is and how it can be calculated efficiently. A methodology proposed in previous publications has been adapted to real cases already studied with Edition 1 of IEC 62305-2 for comparison.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126146333","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 : 2015-09-01DOI: 10.1109/SIPDA.2015.7339316
Kazuo Yamamoto, T. Kawabata, S. Yanagawa
Various types of signal and control cables are connected to railway signaling systems, and usually those cables are comparatively long. In general, surge protective devices (SPDs) are used as a lightning-protection measure. However, certain types of cables cannot have SPDs due to a fail-safe perspective. In this study, using the Finite Difference Time Domain method and measurements, we confirmed the effects of a method proposed to mitigate overvoltage at two instruments grounded at different places in a railway signal system. The proposed method is that other spare (unoccupied) lines surrounding the control lines in a cable are connected to the ground terminals of instruments existing at both ends of the cable. We have reported the effects of the spare line use on the overvoltage, in comparison with a case of no spare line use.
{"title":"Overvoltages at two instruments grounded at different places in a railway signal system","authors":"Kazuo Yamamoto, T. Kawabata, S. Yanagawa","doi":"10.1109/SIPDA.2015.7339316","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339316","url":null,"abstract":"Various types of signal and control cables are connected to railway signaling systems, and usually those cables are comparatively long. In general, surge protective devices (SPDs) are used as a lightning-protection measure. However, certain types of cables cannot have SPDs due to a fail-safe perspective. In this study, using the Finite Difference Time Domain method and measurements, we confirmed the effects of a method proposed to mitigate overvoltage at two instruments grounded at different places in a railway signal system. The proposed method is that other spare (unoccupied) lines surrounding the control lines in a cable are connected to the ground terminals of instruments existing at both ends of the cable. We have reported the effects of the spare line use on the overvoltage, in comparison with a case of no spare line use.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127682278","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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