Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339282
Jianming Li, Tao Luo, Yu Zhang, Yuqing Liu
The lightning waves are one of the main over-voltage electric power equipment suffers, the lighting waves propagate on transmission line in the form of lightning current and lightning current of larger amplitude may bring great effect on insulation combining of adjacent substation and electromagnetic compatible stability. Statistics show that as one of the main factors leading to the failure of the insulation of electric power equipment, lightning over-voltage is becoming a major threat not be ignored to the safe operation of power network. Study on response characteristics of lightning wave on propagation plays a crucial role in insulation configuration. The lightning waves in substation are simulated based on ATP-EMTP in the paper, the lightning waves are simulated under different situations such as different types of original lightning waves, different lightning points, different collection position, and the wave characteristics are analyzed. The response characteristics of lightning waves are obtained on power system propagation.
{"title":"The response characteristics of lightning waves on power system propagation","authors":"Jianming Li, Tao Luo, Yu Zhang, Yuqing Liu","doi":"10.1109/SIPDA.2015.7339282","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339282","url":null,"abstract":"The lightning waves are one of the main over-voltage electric power equipment suffers, the lighting waves propagate on transmission line in the form of lightning current and lightning current of larger amplitude may bring great effect on insulation combining of adjacent substation and electromagnetic compatible stability. Statistics show that as one of the main factors leading to the failure of the insulation of electric power equipment, lightning over-voltage is becoming a major threat not be ignored to the safe operation of power network. Study on response characteristics of lightning wave on propagation plays a crucial role in insulation configuration. The lightning waves in substation are simulated based on ATP-EMTP in the paper, the lightning waves are simulated under different situations such as different types of original lightning waves, different lightning points, different collection position, and the wave characteristics are analyzed. The response characteristics of lightning waves are obtained on power system propagation.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123763354","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339325
H.G.P. Hunt, K. Nixon
Lightning Detection Networks (LDNs) report resolved mean geographical locations for individual strokes. Due to measurement errors, these strokes may not all be reported at the same location even if they are part of the same flash. However, most of the strokes will have 99th percentile error ellipses including this point of interest. This paper describes a method for evaluating the probability of a flash (multiple strokes) attaching to a location in an area of interest. Flashes with more 99th percentile error ellipses including the point of interest can then be compared with flashes with fewer 99th percentile error ellipses including the point of interest. A case study involving a damaged solar panel is presented and the method is applied. The damage was found subsequent to a thunderstorm, and the time of a transient on the output voltage of the panel was recorded. Flashes that were reported at the time of the event are shown to have a high probability of attaching to the location of the panel and can be distinguished from other flashes.
{"title":"Evaluating the probability of a lightning flash attaching to a location using individual LDN stroke reports: Damaged solar panel case study","authors":"H.G.P. Hunt, K. Nixon","doi":"10.1109/SIPDA.2015.7339325","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339325","url":null,"abstract":"Lightning Detection Networks (LDNs) report resolved mean geographical locations for individual strokes. Due to measurement errors, these strokes may not all be reported at the same location even if they are part of the same flash. However, most of the strokes will have 99th percentile error ellipses including this point of interest. This paper describes a method for evaluating the probability of a flash (multiple strokes) attaching to a location in an area of interest. Flashes with more 99th percentile error ellipses including the point of interest can then be compared with flashes with fewer 99th percentile error ellipses including the point of interest. A case study involving a damaged solar panel is presented and the method is applied. The damage was found subsequent to a thunderstorm, and the time of a transient on the output voltage of the panel was recorded. Flashes that were reported at the time of the event are shown to have a high probability of attaching to the location of the panel and can be distinguished from other flashes.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116882948","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339302
Thiago Veloso Gomes, M. Schroeder, Rodolfo Antônio Ribeiro de Moura, R. Alípio
The direct impact of a lightning strike at electrical systems and living beings can lead to destruction of system elements, equipment and eventually death. The resulting magnitude of voltage and current can be attenuated or amplified, due to the reflection process of their waves in points of the system where there is discontinuity of the surge impedance value. The objective of this study is to present an incipient method for investigation of electrical transients due to lightning strikes that reaches directly on overhead lines with an underground insulated cable section. The influence of varying number and positioning of MO arresters in the system, also the variation of the underground cable length, on the maximum voltage at the insulated cable joints are evaluated. This voltage cannot exceed the safety margin considered for the Basic Insulation Level Margin (BIL) of the insulated cable. The energy absorbed by the MO arresters is also analyzed. The results are representative regarding the use of MO arresters to protect transmission lines with insulated cable sections. From the obtained total energy and safety margin, it can be determined which configuration and protection arrangement is the most technically viable.
{"title":"Modeling of lightning strikes at overhead lines: A method to determine insulated cable joints protection","authors":"Thiago Veloso Gomes, M. Schroeder, Rodolfo Antônio Ribeiro de Moura, R. Alípio","doi":"10.1109/SIPDA.2015.7339302","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339302","url":null,"abstract":"The direct impact of a lightning strike at electrical systems and living beings can lead to destruction of system elements, equipment and eventually death. The resulting magnitude of voltage and current can be attenuated or amplified, due to the reflection process of their waves in points of the system where there is discontinuity of the surge impedance value. The objective of this study is to present an incipient method for investigation of electrical transients due to lightning strikes that reaches directly on overhead lines with an underground insulated cable section. The influence of varying number and positioning of MO arresters in the system, also the variation of the underground cable length, on the maximum voltage at the insulated cable joints are evaluated. This voltage cannot exceed the safety margin considered for the Basic Insulation Level Margin (BIL) of the insulated cable. The energy absorbed by the MO arresters is also analyzed. The results are representative regarding the use of MO arresters to protect transmission lines with insulated cable sections. From the obtained total energy and safety margin, it can be determined which configuration and protection arrangement is the most technically viable.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129147702","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339295
Ran Cai, Hong Gao, Dunxun Liu, Hongbo Guo
The major cause of lightning disaster is the Lightning Electromagnetic Pulse (LEMP). Disaster risk assessment services have been widely used in lightning protection centers of many cities in China for years. At present, electromagnetic environment assessment services are being used more and more at many lightning protection centers in China, with various methods. Most of them adopt an expensive commercial software package which needs 3D modeling of complex structure and high computational costs. This article describes a useful assessment tool based on finite-difference time-domain (FDTD) method focusing on an electromagnetic environment of buildings featured with a simple setup procedure. This software package has been applied in daily evaluation services, filling gaps of the current commercial software, leading to a great potential in this area.
{"title":"A Lightning Electromagn-etic environment evaluation software package based on FDTD - the design and implementation","authors":"Ran Cai, Hong Gao, Dunxun Liu, Hongbo Guo","doi":"10.1109/SIPDA.2015.7339295","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339295","url":null,"abstract":"The major cause of lightning disaster is the Lightning Electromagnetic Pulse (LEMP). Disaster risk assessment services have been widely used in lightning protection centers of many cities in China for years. At present, electromagnetic environment assessment services are being used more and more at many lightning protection centers in China, with various methods. Most of them adopt an expensive commercial software package which needs 3D modeling of complex structure and high computational costs. This article describes a useful assessment tool based on finite-difference time-domain (FDTD) method focusing on an electromagnetic environment of buildings featured with a simple setup procedure. This software package has been applied in daily evaluation services, filling gaps of the current commercial software, leading to a great potential in this area.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130311952","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339286
A. Heilmann, M. Jusevicius, A. Lazzaretti, C. Pinto, Reginaldo Prestes
Direct and indirect lightning strokes can cause severe overvoltages in distribution networks and, consequently, failures and power outages, due to insulation problems and equipment damages along the network. In order to assist the analysis of lightning effects in power quality indices, we present in this paper, a detailed analysis of the local electric field, combined with the information from Lightning Location Systems (LLS) and voltage waveforms recorded in the distribution network. The proposed analysis is performed in a monitoring network that was particularly designed for the approach presented in this paper. The monitoring network is composed by four Campbell Field Mill sensors, four waveform recorders and the LLS information. Based on the local electric field profile, it is possible to confirm (or reject) lightning activity in the region under analysis, by comparing the information recorded by these three sources of information. Finally, we present some initial case studies addressing the advantages and main limitations of the proposed approach.
直接雷击和间接雷击都可能导致配电网严重过电压，从而导致电网绝缘问题和设备损坏而导致故障和停电。为了帮助分析雷电对电能质量指标的影响，本文结合雷电定位系统(LLS)的信息和配电网中记录的电压波形，对局部电场进行了详细的分析。所提出的分析是在一个监测网络中进行的，该网络是专门为本文提出的方法设计的。监测网络由四个Campbell Field Mill传感器、四个波形记录仪和LLS信息组成。根据局部电场廓线，通过比较这三个信息源记录的信息，可以确认(或拒绝)分析区域的闪电活动。最后，我们提出了一些初步的案例研究，以解决所提出的方法的优点和主要局限性。
{"title":"Visualization and analysis of atmospheric electric field local profile - REMOTE-E network","authors":"A. Heilmann, M. Jusevicius, A. Lazzaretti, C. Pinto, Reginaldo Prestes","doi":"10.1109/SIPDA.2015.7339286","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339286","url":null,"abstract":"Direct and indirect lightning strokes can cause severe overvoltages in distribution networks and, consequently, failures and power outages, due to insulation problems and equipment damages along the network. In order to assist the analysis of lightning effects in power quality indices, we present in this paper, a detailed analysis of the local electric field, combined with the information from Lightning Location Systems (LLS) and voltage waveforms recorded in the distribution network. The proposed analysis is performed in a monitoring network that was particularly designed for the approach presented in this paper. The monitoring network is composed by four Campbell Field Mill sensors, four waveform recorders and the LLS information. Based on the local electric field profile, it is possible to confirm (or reject) lightning activity in the region under analysis, by comparing the information recorded by these three sources of information. Finally, we present some initial case studies addressing the advantages and main limitations of the proposed approach.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121688475","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339297
A. Lazzaretti, S. L. F. Santos, L. F. Toledo, M. A. Ravaglio, A. Piantini, A. Heilmann, C. Pinto, Ricardo H. Ogasawara
Overhead power distribution lines have significant power quality variations (voltage transients) during thunderstorms. Lightning strokes, whether direct or indirect, are among the main causes of such power quality disturbances. In order to assist the analysis of lightning effects on power quality indices, we present in this paper a monitoring network and an integrated database analysis, including voltage waveform recorders, local electric field measurement, information from Lightning Location Systems, and utility databases. The idea is to present a general procedure to indicate the correlation between lightning and power quality events (mainly short-circuits) in the monitored distribution network. Also, we present an automatic waveform analysis that allows the automatic segmentation and classification of transients in a waveform and a simulation procedure that assists the correlation process. Finally, we present an initial case study addressing the advantages and relevant correlations that can be obtained from the proposed approach.
{"title":"An integrated monitoring and data analysis system to evaluate the effects of lightning activity on distribution networks","authors":"A. Lazzaretti, S. L. F. Santos, L. F. Toledo, M. A. Ravaglio, A. Piantini, A. Heilmann, C. Pinto, Ricardo H. Ogasawara","doi":"10.1109/SIPDA.2015.7339297","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339297","url":null,"abstract":"Overhead power distribution lines have significant power quality variations (voltage transients) during thunderstorms. Lightning strokes, whether direct or indirect, are among the main causes of such power quality disturbances. In order to assist the analysis of lightning effects on power quality indices, we present in this paper a monitoring network and an integrated database analysis, including voltage waveform recorders, local electric field measurement, information from Lightning Location Systems, and utility databases. The idea is to present a general procedure to indicate the correlation between lightning and power quality events (mainly short-circuits) in the monitored distribution network. Also, we present an automatic waveform analysis that allows the automatic segmentation and classification of transients in a waveform and a simulation procedure that assists the correlation process. Finally, we present an initial case study addressing the advantages and relevant correlations that can be obtained from the proposed approach.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"530 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124507762","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339333
D. del Rio, C. Younes, J. Pulgarin
This paper presents the lighting activity behavior over Bogota (Colombia) and its comparison with some adjacent regions due to urban effect. The study was developed using a methodology presented by Jvar and others in [1]. In order to achieve the goals, 6 years of lightning data from SID (one of the Colombian lighting location systems) and particulate matter PM10 data from the Air (Quality Network of Bogota - RMCAB were used. the results show an increase of lighting activity over Bogota on approximately 200% during the evaluated period.
{"title":"Lightning activity behavior over Bogota - Colombia due to urban effect","authors":"D. del Rio, C. Younes, J. Pulgarin","doi":"10.1109/SIPDA.2015.7339333","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339333","url":null,"abstract":"This paper presents the lighting activity behavior over Bogota (Colombia) and its comparison with some adjacent regions due to urban effect. The study was developed using a methodology presented by Jvar and others in [1]. In order to achieve the goals, 6 years of lightning data from SID (one of the Colombian lighting location systems) and particulate matter PM10 data from the Air (Quality Network of Bogota - RMCAB were used. the results show an increase of lighting activity over Bogota on approximately 200% during the evaluated period.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134477872","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339328
Jorge Alejandro Cristancho C, C. Rivera, J. Pantoja, F. Roman
Lightning accidents involving several fatalities and injuries are reported every year in the world. Colombia, a country with a high keraunic level, reports frequently lightning fatalities involving several injury mechanisms. However, there are also some fortunate cases where the victims have survived without disabling traumas. Two nonfatal events in which lightning strikes persons are reported. In both cases it is observed that some metal objects such as necklaces or buckle belts saved the life and integrity of the victims. Moreover, both the relative localization and the comprehensive description of the cases scenarios involving visual consequences in the victim's skin are presented. The analysis of such accidents could be of interest to protect persons against indirect lightning currents.
{"title":"Nonfatal lightning injuries in Colombia: Case reports","authors":"Jorge Alejandro Cristancho C, C. Rivera, J. Pantoja, F. Roman","doi":"10.1109/SIPDA.2015.7339328","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339328","url":null,"abstract":"Lightning accidents involving several fatalities and injuries are reported every year in the world. Colombia, a country with a high keraunic level, reports frequently lightning fatalities involving several injury mechanisms. However, there are also some fortunate cases where the victims have survived without disabling traumas. Two nonfatal events in which lightning strikes persons are reported. In both cases it is observed that some metal objects such as necklaces or buckle belts saved the life and integrity of the victims. Moreover, both the relative localization and the comprehensive description of the cases scenarios involving visual consequences in the victim's skin are presented. The analysis of such accidents could be of interest to protect persons against indirect lightning currents.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"34 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128748665","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339280
M. Ismail, V. Cooray, P. Hettiarachchi, M. Rahman, M. Fernando, D. Johari
It is suggested that the chaotic pulse trains observed in lightning flashes are created as a result of the superposition of several regular pulse bursts produced by dart leader type discharge processes in the cloud. The similarity between the individual pulses in both chaotic and regular pulse bursts strengthen this suggestion.
{"title":"On the possible origin of chaotic pulse trains in lightning flashes","authors":"M. Ismail, V. Cooray, P. Hettiarachchi, M. Rahman, M. Fernando, D. Johari","doi":"10.1109/SIPDA.2015.7339280","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339280","url":null,"abstract":"It is suggested that the chaotic pulse trains observed in lightning flashes are created as a result of the superposition of several regular pulse bursts produced by dart leader type discharge processes in the cloud. The similarity between the individual pulses in both chaotic and regular pulse bursts strengthen this suggestion.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121513503","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 : 2015-11-30DOI: 10.1109/SIPDA.2015.7339284
A. De Conti, M. P. S. Emídio, Raphael T. S. Lopes, Rodrigo O. Brochado, Vinícius C. Oliveira, J. L. Silvino
This paper presents a preliminary study on the effect of dispersive ground parameters on surges transferred from medium-voltage to low-voltage distribution lines located in rural areas. In this study, a direct lightning strike is assumed at different points of a distribution line terminated at a 10 kVA 7.967 kV/240-120 V single-phase transformer with center-tapped secondary. The distribution line is modeled using the JMarti model modified to include the variation with frequency of the ground resistivity and permittivity. The transformer is represented as a two-port model valid in a wide frequency range. Insulation breakdown is modeled using the disruptive effect method and for simplicity the grounding impedances are represented as simple resistances. Voltages transferred to the transformer secondary are calculated for different conditions. It is shown that considering dispersive ground parameters does not have a significant influence on phase-to-neutral voltages transferred through the transformer to its low-voltage side in the investigated cases.
{"title":"Preliminary study of the effect of dispersive ground parameters on transferred lightning surges","authors":"A. De Conti, M. P. S. Emídio, Raphael T. S. Lopes, Rodrigo O. Brochado, Vinícius C. Oliveira, J. L. Silvino","doi":"10.1109/SIPDA.2015.7339284","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339284","url":null,"abstract":"This paper presents a preliminary study on the effect of dispersive ground parameters on surges transferred from medium-voltage to low-voltage distribution lines located in rural areas. In this study, a direct lightning strike is assumed at different points of a distribution line terminated at a 10 kVA 7.967 kV/240-120 V single-phase transformer with center-tapped secondary. The distribution line is modeled using the JMarti model modified to include the variation with frequency of the ground resistivity and permittivity. The transformer is represented as a two-port model valid in a wide frequency range. Insulation breakdown is modeled using the disruptive effect method and for simplicity the grounding impedances are represented as simple resistances. Voltages transferred to the transformer secondary are calculated for different conditions. It is shown that considering dispersive ground parameters does not have a significant influence on phase-to-neutral voltages transferred through the transformer to its low-voltage side in the investigated cases.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130193610","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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