Pub Date : 2016-12-22DOI: 10.1109/ICLP.2016.7791428
D. Mitchard, N. S. Jamoshid, C. Stone, A. Haddad
This paper focuses on the displacement of aluminum plates subjected to the forces generated by a lightning current in order to compare modelling and experimental results directly. The electromechanical forces produced during lightning strikes can cause catastrophic damage and hence there is a need to understand the performance of existing and new materials under such extreme conditions in order to improve the ability to withstand these forces and minimize damage. Half-meter square 2mm thick aluminum plates were struck with a range of lightning currents from 40kA to 100kA. A computer model using a constant direct current input was used to predict the point of maximum deflection immediately following a strike which was compared to the measured maximum deflection from the corresponding experiment. Both model and experiment demonstrated an approximately linear relationship between maximum deflection and lightning current for aluminum. In addition, the experiment exhibited damped oscillation behavior following the maximum deflection and the extent of this was also related to magnitude of the lightning current. It was also found that, in the experiment, the test sample experienced an additional force, presumed to be due to air pressure, which could be corrected for. Overall, the static model and dynamic experiments showed close agreement with differences likely due to factors in each respective study.
{"title":"Experimental and theoretical evaluation of aluminium deflection due to lightning strikes","authors":"D. Mitchard, N. S. Jamoshid, C. Stone, A. Haddad","doi":"10.1109/ICLP.2016.7791428","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791428","url":null,"abstract":"This paper focuses on the displacement of aluminum plates subjected to the forces generated by a lightning current in order to compare modelling and experimental results directly. The electromechanical forces produced during lightning strikes can cause catastrophic damage and hence there is a need to understand the performance of existing and new materials under such extreme conditions in order to improve the ability to withstand these forces and minimize damage. Half-meter square 2mm thick aluminum plates were struck with a range of lightning currents from 40kA to 100kA. A computer model using a constant direct current input was used to predict the point of maximum deflection immediately following a strike which was compared to the measured maximum deflection from the corresponding experiment. Both model and experiment demonstrated an approximately linear relationship between maximum deflection and lightning current for aluminum. In addition, the experiment exhibited damped oscillation behavior following the maximum deflection and the extent of this was also related to magnitude of the lightning current. It was also found that, in the experiment, the test sample experienced an additional force, presumed to be due to air pressure, which could be corrected for. Overall, the static model and dynamic experiments showed close agreement with differences likely due to factors in each respective study.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116264129","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 : 2016-12-19DOI: 10.1109/ICLP.2016.7791469
Yoshiyasu Koga, Y. Yoneda, Tomoyuki Sato, S. Yokoyama, S. Matsumoto
In Japan, porcelain-housed internally gapped lightning surge arresters are applied for 6.6kV distribution lines. A lightning surge arrester is composed of Metal Oxide Varistors (MOVs) and an internal gap, which are installed in a porcelain housing having sealing structure. It is well known that a dominant degradation factor of a surge arrester is follow current interrupting ability of a MOV. This paper is focused on follow current interrupting ability of a degraded MOV due to lightning current. The degradation characteristics of a MOV due to lightning surge is examined by measuring the reference voltage of the MOV after lightning impulse currents are applied to a MOV. The variation of the reference voltage in the negative direction voltage was bigger than that of the positive direction voltage. Therefore, it should be evaluated by checking the reference voltage using both positive and negative direction during the degradation test.
{"title":"Degradation characteristics on MOV of surge arrester used for 6.6kV power distribution line","authors":"Yoshiyasu Koga, Y. Yoneda, Tomoyuki Sato, S. Yokoyama, S. Matsumoto","doi":"10.1109/ICLP.2016.7791469","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791469","url":null,"abstract":"In Japan, porcelain-housed internally gapped lightning surge arresters are applied for 6.6kV distribution lines. A lightning surge arrester is composed of Metal Oxide Varistors (MOVs) and an internal gap, which are installed in a porcelain housing having sealing structure. It is well known that a dominant degradation factor of a surge arrester is follow current interrupting ability of a MOV. This paper is focused on follow current interrupting ability of a degraded MOV due to lightning current. The degradation characteristics of a MOV due to lightning surge is examined by measuring the reference voltage of the MOV after lightning impulse currents are applied to a MOV. The variation of the reference voltage in the negative direction voltage was bigger than that of the positive direction voltage. Therefore, it should be evaluated by checking the reference voltage using both positive and negative direction during the degradation test.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128492236","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 : 2016-09-25DOI: 10.1109/ICLP.2016.7791390
Satheesh Jacob, Nadeem Basharat, W. H. Siew, Seungjae Choi
The current lightning protection systems are well proven and widely deployed for general situation. However, the methodology may be inadequate when applied to various situations especially in open area because the current BS EN and international standards do not cover guidance or procedures for lightning protection in open areas. The fundamental principle of lightning safety is `No place outside is safe when thunderstorms are in the area!' The purpose of this research is to provide an outline of the lightning protection system strategy for the protection of life, livestock, sensitive equipment and property in open areas. The research proposes alternative methodology that can be used in open area for safety rather than the No-Notice personal backcountry lightning risk reduction process. Based on the results a suitable protection mechanism shall be developed to concept stage.
{"title":"Lightning protection of a temporary structure in open area","authors":"Satheesh Jacob, Nadeem Basharat, W. H. Siew, Seungjae Choi","doi":"10.1109/ICLP.2016.7791390","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791390","url":null,"abstract":"The current lightning protection systems are well proven and widely deployed for general situation. However, the methodology may be inadequate when applied to various situations especially in open area because the current BS EN and international standards do not cover guidance or procedures for lightning protection in open areas. The fundamental principle of lightning safety is `No place outside is safe when thunderstorms are in the area!' The purpose of this research is to provide an outline of the lightning protection system strategy for the protection of life, livestock, sensitive equipment and property in open areas. The research proposes alternative methodology that can be used in open area for safety rather than the No-Notice personal backcountry lightning risk reduction process. Based on the results a suitable protection mechanism shall be developed to concept stage.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127005163","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.2016.7791476
S. Yasui, Tetsuya Takuwa, Daisuke Morishima, S. Sumi, T. Morimoto, K. Horii
In recent years, there has been a significant increase in the damage to electrical and electronic devices owing to lightning surge-induced overvoltage/overcurrent, in Japan. In particular, the lightning surge overcurrent that flows through grounding lines can cause serious damage to electronic equipment. To understand the phenomenon of the lightning surge current propagation in the ground poles, it is important to understand the lightning current propagation in the soil. We have developed a detection circuit for determining the lightning current distribution in the soil and have measured the lightning current caused by rocket-triggered lightning in the soil. We have observed the lightning current in the soil owing to a negative precursor discharge at a depth of 0.1 m, 30 m from the triggered flash point.
{"title":"Observation of lightning current in the soil by rocket-triggered lightning","authors":"S. Yasui, Tetsuya Takuwa, Daisuke Morishima, S. Sumi, T. Morimoto, K. Horii","doi":"10.1109/ICLP.2016.7791476","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791476","url":null,"abstract":"In recent years, there has been a significant increase in the damage to electrical and electronic devices owing to lightning surge-induced overvoltage/overcurrent, in Japan. In particular, the lightning surge overcurrent that flows through grounding lines can cause serious damage to electronic equipment. To understand the phenomenon of the lightning surge current propagation in the ground poles, it is important to understand the lightning current propagation in the soil. We have developed a detection circuit for determining the lightning current distribution in the soil and have measured the lightning current caused by rocket-triggered lightning in the soil. We have observed the lightning current in the soil owing to a negative precursor discharge at a depth of 0.1 m, 30 m from the triggered flash point.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"346 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":"124267653","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.2016.7791398
J. Cvetic, M. Ignjatović, M. Tausanovic, N. Mijajlovic, D. Pavlović, F. Heidler
Appearance of an overcompensated positive electric field in most vertical field measurements performed very close to the channel core is explained using the extended generalized traveling current source (extended GTCS) return stroke model with current reflections from the ground. New effects in the corona sheath due to the reflection of current pulses have been noted and taken into account. The channel-base current is separated into two components. The first current component is fast and with a greater peak value, while the second component is slower and with a lower peak. We've analyzed a return stroke for which the channel-base current and the electric field waveform very close to the triggered lightning are measured simultaneously. A new charging function is calculated according to the extended GTCS model, as well as the value of the ground reflection coefficient for the analyzed stroke. On one hand, new results are obtained through calculations of the channel charging function. On the other, the calculated values of the ground reflection coefficient confirm the results reported in other independent studies performed in natural or laboratory conditions. Finally, the concept of the extended GTCS model, that takes into account current pulse reflections from the ground, is proved to be correct.
{"title":"Electric field close to lightning channel in the presence of current reflections from the ground","authors":"J. Cvetic, M. Ignjatović, M. Tausanovic, N. Mijajlovic, D. Pavlović, F. Heidler","doi":"10.1109/ICLP.2016.7791398","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791398","url":null,"abstract":"Appearance of an overcompensated positive electric field in most vertical field measurements performed very close to the channel core is explained using the extended generalized traveling current source (extended GTCS) return stroke model with current reflections from the ground. New effects in the corona sheath due to the reflection of current pulses have been noted and taken into account. The channel-base current is separated into two components. The first current component is fast and with a greater peak value, while the second component is slower and with a lower peak. We've analyzed a return stroke for which the channel-base current and the electric field waveform very close to the triggered lightning are measured simultaneously. A new charging function is calculated according to the extended GTCS model, as well as the value of the ground reflection coefficient for the analyzed stroke. On one hand, new results are obtained through calculations of the channel charging function. On the other, the calculated values of the ground reflection coefficient confirm the results reported in other independent studies performed in natural or laboratory conditions. Finally, the concept of the extended GTCS model, that takes into account current pulse reflections from the ground, is proved to be correct.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"84 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":"127485372","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.2016.7791459
Mengni Long, M. Becerra, R. Thottappillil
Lightning strikes are a common cause of damage to wind turbine blades. This paper intends to discuss the lightning incidence to wind turbine parks considering both downward and upward lightning discharges. The analysis is based on numerical simulations performed with the Self-consistent Leader Inception and Propagation Model SLIM. It is found that the calculated annual frequency of strikes due to downward lightning is several orders of magnitude smaller than field observations in the Horns Reef 1 wind park. This shows that upward lightning discharges should be considered in order to obtain proper estimates of the lightning incidence to wind turbines. Thus, it is also found that the thundercloud electric field required to trigger upward lightning from wind turbines depends on whether the discharge is self-triggered or nearby-lightning triggered. A discussion about the existing limitations to estimate the upward lightning incidence in wind parks is presented.
{"title":"On the lightning incidence to wind farms","authors":"Mengni Long, M. Becerra, R. Thottappillil","doi":"10.1109/ICLP.2016.7791459","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791459","url":null,"abstract":"Lightning strikes are a common cause of damage to wind turbine blades. This paper intends to discuss the lightning incidence to wind turbine parks considering both downward and upward lightning discharges. The analysis is based on numerical simulations performed with the Self-consistent Leader Inception and Propagation Model SLIM. It is found that the calculated annual frequency of strikes due to downward lightning is several orders of magnitude smaller than field observations in the Horns Reef 1 wind park. This shows that upward lightning discharges should be considered in order to obtain proper estimates of the lightning incidence to wind turbines. Thus, it is also found that the thundercloud electric field required to trigger upward lightning from wind turbines depends on whether the discharge is self-triggered or nearby-lightning triggered. A discussion about the existing limitations to estimate the upward lightning incidence in wind parks is presented.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"58 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":"122724939","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.2016.7791430
P. Tuethong, P. Yutthagowith, S. Maneerot
This paper presents the design and construction of a variable air-core inductor for lightning impulse current test on surge arresters. The designed inductance value of the developed air core inductor is in the range of 6.4 pH to 50 pH. To confirm the inductor design, it is employed in the impulse current generation circuit. In the experiment, the impulse currents were generated in the short-circuit condition and were injected to an arrester. The generated waveforms are compared with the simulation. Good agreement is observed. From the comparison of experimental and simulated results, it can be confirmed that the developed air core inductor can be used to adjust impulse current waveform to that according to the standard requirement efficiently.
{"title":"Design and construction of a variable air-core inductor for lightning impulse current test on surge arresters","authors":"P. Tuethong, P. Yutthagowith, S. Maneerot","doi":"10.1109/ICLP.2016.7791430","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791430","url":null,"abstract":"This paper presents the design and construction of a variable air-core inductor for lightning impulse current test on surge arresters. The designed inductance value of the developed air core inductor is in the range of 6.4 pH to 50 pH. To confirm the inductor design, it is employed in the impulse current generation circuit. In the experiment, the impulse currents were generated in the short-circuit condition and were injected to an arrester. The generated waveforms are compared with the simulation. Good agreement is observed. From the comparison of experimental and simulated results, it can be confirmed that the developed air core inductor can be used to adjust impulse current waveform to that according to the standard requirement efficiently.","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":"114484216","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.2016.7791433
Luis Eduardo Perdomo Orjuela, Francisco Javier Vela Santamaría, Francisco Roman
A surge sensitivity study of distribution transformers in rural areas of Cundinamarca - Colombia was performed. The analysis took into account the grounding resistance magnitude and the transient overvoltage injection point. Lightning overvoltages are introduced in the IEEE 13 bus system test feeder by using the EMTP-ATP program, results show that delta surge arrester configuration used to protect delta winding of distribution transformers before some microseconds, limits overvoltage transients over zero time axes., contrary to phase - neutral configuration which limit overvoltage to residual voltage in both sides of time axes.
{"title":"Transient overvoltage in distribution networks in rural areas","authors":"Luis Eduardo Perdomo Orjuela, Francisco Javier Vela Santamaría, Francisco Roman","doi":"10.1109/ICLP.2016.7791433","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791433","url":null,"abstract":"A surge sensitivity study of distribution transformers in rural areas of Cundinamarca - Colombia was performed. The analysis took into account the grounding resistance magnitude and the transient overvoltage injection point. Lightning overvoltages are introduced in the IEEE 13 bus system test feeder by using the EMTP-ATP program, results show that delta surge arrester configuration used to protect delta winding of distribution transformers before some microseconds, limits overvoltage transients over zero time axes., contrary to phase - neutral configuration which limit overvoltage to residual voltage in both sides of time axes.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"23 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":"114492234","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.2016.7791518
Alexander Kern, R. Brocke, Veiko Raab, Martin Hannig, Michael Rock, O. Beierl, Wolfgang Zischank
Interception efficiency (IE) is the most important parameter to show the effectiveness of air-termination systems. The dynamic electro-geometrical model (DEGM), a numerical method, is capable of calculating such interception efficiencies. This model is purely based on international accepted models, parameters, deviations and dependencies, which are also comprised in the IEC 62305. So far it has been used to calculate the interception efficiencies for rod-type air-terminations. This paper discusses applications using the DEGM. A detailed analysis shows that for a rod-based air-termination system the IE is much better than expected. This leads to the idea of a comparison analysis between an air-termination system purely planned according to the standardized “rolling-sphere” method and an “optimized” air-termination system based on the DEGM.
{"title":"Detailed calculation of interception efficiencies for air-termination systems using the dynamic electro-geometrical model — Practical applications","authors":"Alexander Kern, R. Brocke, Veiko Raab, Martin Hannig, Michael Rock, O. Beierl, Wolfgang Zischank","doi":"10.1109/ICLP.2016.7791518","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791518","url":null,"abstract":"Interception efficiency (IE) is the most important parameter to show the effectiveness of air-termination systems. The dynamic electro-geometrical model (DEGM), a numerical method, is capable of calculating such interception efficiencies. This model is purely based on international accepted models, parameters, deviations and dependencies, which are also comprised in the IEC 62305. So far it has been used to calculate the interception efficiencies for rod-type air-terminations. This paper discusses applications using the DEGM. A detailed analysis shows that for a rod-based air-termination system the IE is much better than expected. This leads to the idea of a comparison analysis between an air-termination system purely planned according to the standardized “rolling-sphere” method and an “optimized” air-termination system based on the DEGM.","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":"129435195","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.2016.7791407
Zhang Han, Zhao Chun, Shanqiang Gu, Wanxing Feng, Haitao Wang, Lu Enze, Juntian Guo, Hantao Tao
A single-station-based three-dimensional (3D) acoustic lighting mapping system comprising a microphone array has been developed and used for lightning observations, in which a new broadband direction-of-arrival (DOA) estimation techniques namely incoherent signal-subspace method are proposed for thunder signals in the far-field. Two cloud-to-ground (CG) flashes with highly branch channels recorded by the system are analyzed and presented in this paper. The acoustic mapping results can not only locate on the main channel produced by the return stroke process but also depict the branch channels. Moreover, the located thunder sources by the mapping system and the photography of the high speed camera agree well with each other demonstrating the effectiveness and correctness of the estimation techniques and the mapping system.
{"title":"Lightning imaging with thunder using broadband direction-of-arrival estimation technique","authors":"Zhang Han, Zhao Chun, Shanqiang Gu, Wanxing Feng, Haitao Wang, Lu Enze, Juntian Guo, Hantao Tao","doi":"10.1109/ICLP.2016.7791407","DOIUrl":"https://doi.org/10.1109/ICLP.2016.7791407","url":null,"abstract":"A single-station-based three-dimensional (3D) acoustic lighting mapping system comprising a microphone array has been developed and used for lightning observations, in which a new broadband direction-of-arrival (DOA) estimation techniques namely incoherent signal-subspace method are proposed for thunder signals in the far-field. Two cloud-to-ground (CG) flashes with highly branch channels recorded by the system are analyzed and presented in this paper. The acoustic mapping results can not only locate on the main channel produced by the return stroke process but also depict the branch channels. Moreover, the located thunder sources by the mapping system and the photography of the high speed camera agree well with each other demonstrating the effectiveness and correctness of the estimation techniques and the mapping system.","PeriodicalId":373744,"journal":{"name":"2016 33rd International Conference on Lightning Protection (ICLP)","volume":"40 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":"129077582","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：