Pub Date : 2015-09-01DOI: 10.1109/SIPDA.2015.7339319
C. A. Morales Rodriguez, J. Neves, Evandro M. Anselmo, M. Mathias, C. Rabak, Keyla Sampaio Camara, Nilo Rodrigues, R. S. Gondim, Felipe L. C. dos Santos
This study presents a slow antenna that has been develop to work as a lightning warning system (LWS). The sensor has been developed by STORM-T Laboratory of the University of São Paulo as part of a research and development program of the Companhia Energética do Ceará (COELCE). The LWS built can detect intra-cloud (IC) and cloud to ground (CG) lightning that is used to predict the probability of CG occurrence. The system is a slow-antenna integrated with a microcontroller and a single board computer that proportionate a compact design and low cost. Furthermore, the firmware can be update to include more detecting features anytime.
{"title":"Lightning warning system based on a slow antenna","authors":"C. A. Morales Rodriguez, J. Neves, Evandro M. Anselmo, M. Mathias, C. Rabak, Keyla Sampaio Camara, Nilo Rodrigues, R. S. Gondim, Felipe L. C. dos Santos","doi":"10.1109/SIPDA.2015.7339319","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339319","url":null,"abstract":"This study presents a slow antenna that has been develop to work as a lightning warning system (LWS). The sensor has been developed by STORM-T Laboratory of the University of São Paulo as part of a research and development program of the Companhia Energética do Ceará (COELCE). The LWS built can detect intra-cloud (IC) and cloud to ground (CG) lightning that is used to predict the probability of CG occurrence. The system is a slow-antenna integrated with a microcontroller and a single board computer that proportionate a compact design and low cost. Furthermore, the firmware can be update to include more detecting features anytime.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"129 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120946538","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.2015.7339324
Fernando Diaz, F. Roman
A study considering both the last thirteen year surface temperature, greenhouses gases (water vapor, carbondioxide, ozone and methane) data measured by Aqua Earth-observing satellite mission and the 15 years lightning events data recorded by the Tropical Rainfall Measuring Mission, suggest a positive correlation between some greenhouse gases and lightning activity in Colombia. This result is relevant to understand the factors affecting weather patterns and probably increasing annual lightning activity rate in Colombia.
{"title":"Annual lightning events in Colombia: Why are they increasing?","authors":"Fernando Diaz, F. Roman","doi":"10.1109/SIPDA.2015.7339324","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339324","url":null,"abstract":"A study considering both the last thirteen year surface temperature, greenhouses gases (water vapor, carbondioxide, ozone and methane) data measured by Aqua Earth-observing satellite mission and the 15 years lightning events data recorded by the Tropical Rainfall Measuring Mission, suggest a positive correlation between some greenhouse gases and lightning activity in Colombia. This result is relevant to understand the factors affecting weather patterns and probably increasing annual lightning activity rate in Colombia.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"298 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":"121358659","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.2015.7339307
A. Raizer, W. Valente, V. L. Coelho, Carlos Iran Cardoso
The main challenge of this article is to show a feasible solution for measuring earth resistance at short distances, considering that in practical terms, such is the condition found in the great majority of urban substations. A field test with 4 grounding meshes with different geometric configurations was implemented and used in order to perform a great number of measurement tests. Based on all the data and the processing of the measurement results, a mathematical model called the Extended Tagg Method was developed in order to establish the correct distance to carry out the measurement of earth resistance at short distances. A discussion on the proposed method, as well as its analysis of accuracy and susceptibility in view of external interference is performed, as well as its validation in real substations.
{"title":"Contribution to Tagg's methodology in the resistance measurement of earth-electrode systems at reduced distances","authors":"A. Raizer, W. Valente, V. L. Coelho, Carlos Iran Cardoso","doi":"10.1109/SIPDA.2015.7339307","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339307","url":null,"abstract":"The main challenge of this article is to show a feasible solution for measuring earth resistance at short distances, considering that in practical terms, such is the condition found in the great majority of urban substations. A field test with 4 grounding meshes with different geometric configurations was implemented and used in order to perform a great number of measurement tests. Based on all the data and the processing of the measurement results, a mathematical model called the Extended Tagg Method was developed in order to establish the correct distance to carry out the measurement of earth resistance at short distances. A discussion on the proposed method, as well as its analysis of accuracy and susceptibility in view of external interference is performed, as well as its validation in real substations.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"56 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":"129825910","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.2015.7339274
Silva J. Maurilio, Pinheiro J. C. Mario
The study was accomplished in the transmission line (LT) 138 kV Barreiras - Rio Grande, placed at the Bahia west. This study shows a practical and well happened case, involving necessary stages for decrease the number turn off fortuitous in LT 138 kV Barreiras-Rio Grande.
{"title":"Soil improvement for currents dissipation through substation surge arrester on earthing system in LT 138 kV Barreiras - Rio Grande","authors":"Silva J. Maurilio, Pinheiro J. C. Mario","doi":"10.1109/SIPDA.2015.7339274","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339274","url":null,"abstract":"The study was accomplished in the transmission line (LT) 138 kV Barreiras - Rio Grande, placed at the Bahia west. This study shows a practical and well happened case, involving necessary stages for decrease the number turn off fortuitous in LT 138 kV Barreiras-Rio Grande.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"48 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":"131907649","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.2015.7339337
V. Rakov, M. D. Tran, Y. Zhu, S. Mallick
An overview of recent results of high-speed video observations at the Lightning Observatory in Gainesville (LOG), Florida, is given. The emphasis is placed on the lightning attachment process and interaction of lightning with tall grounded objects.
{"title":"New high-speed video observations of natural lightning at the Lightning Observatory in Gainesville, Florida","authors":"V. Rakov, M. D. Tran, Y. Zhu, S. Mallick","doi":"10.1109/SIPDA.2015.7339337","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339337","url":null,"abstract":"An overview of recent results of high-speed video observations at the Lightning Observatory in Gainesville (LOG), Florida, is given. The emphasis is placed on the lightning attachment process and interaction of lightning with tall grounded objects.","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":"117112134","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.2015.7339311
A. R. Rodrigues, W. do Couto Boaventura, Geraldo Caixeta Guimarães, Daniel Araújo Caixeta, Marcelo Lynce Ribeiro Chaves, M. A. Tamashiro
This paper presents a study about the lightning performance of transmission lines using advanced electromagnetic models to perform a realistic representation of the first stroke current. Based on the measurement data obtained at the Morro do Cachimbo/MG Station, it was possible to synthesize first stroke current waveforms with single- an double-peak in a realistic way. In addition, the investigation involves an analysis with a model implemented in ATP-Models to reproduce the first stroke current recommended by CIGRÉ methodology. The breakdown process was represented through a Leader Progression Model able to represent accurately the physical process established along the perimeter of the insulator strings, during a backflashover event. The results allowed an investigation of the waveforms and amplitudes of the resulting overvoltages across the insulators. The computational modeling developed permits to identify the amplitude of the overvoltage that produces the backflashover and the instant of time that the breakdown occurs.
本文利用先进的电磁模型对输电线路的雷电性能进行了研究，以真实地表示第一冲程电流。基于在Morro do Cachimbo/MG站获得的测量数据，可以真实地合成单峰和双峰的首冲程电流波形。此外，该研究还包括使用ATP-Models中实现的模型进行分析，以重现CIGRÉ方法推荐的第一次冲程电流。击穿过程通过Leader级数模型来表示，该模型能够准确地表示在反闪络事件中沿绝缘子串周长建立的物理过程。该结果允许对通过绝缘体产生的过电压的波形和幅度进行调查。所开发的计算模型允许识别产生反闪络的过电压的幅值和击穿发生的瞬间。
{"title":"Lightning overvoltage investigation due to a backflashover event in transmission lines: A realist modeling proposal","authors":"A. R. Rodrigues, W. do Couto Boaventura, Geraldo Caixeta Guimarães, Daniel Araújo Caixeta, Marcelo Lynce Ribeiro Chaves, M. A. Tamashiro","doi":"10.1109/SIPDA.2015.7339311","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339311","url":null,"abstract":"This paper presents a study about the lightning performance of transmission lines using advanced electromagnetic models to perform a realistic representation of the first stroke current. Based on the measurement data obtained at the Morro do Cachimbo/MG Station, it was possible to synthesize first stroke current waveforms with single- an double-peak in a realistic way. In addition, the investigation involves an analysis with a model implemented in ATP-Models to reproduce the first stroke current recommended by CIGRÉ methodology. The breakdown process was represented through a Leader Progression Model able to represent accurately the physical process established along the perimeter of the insulator strings, during a backflashover event. The results allowed an investigation of the waveforms and amplitudes of the resulting overvoltages across the insulators. The computational modeling developed permits to identify the amplitude of the overvoltage that produces the backflashover and the instant of time that the breakdown occurs.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"203 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":"125736216","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.2015.7339312
L. Diaz, C. Miry, C. Guiffaut, N. Ticaud, A. Reineix
An efficient model to include thin wire structures in FDTD is used and validated in a lightning transient study on a buried cable in a realistic industrial site. The model is based on the thin wire formalism of Holland and permits to consider different types of structures: bare wires, single core insulated cables, and single core coaxial cables. The industrial site is composed by a building, a grounding grid, and a buried single core coaxial cable leaving the building. An equivalent electronic equipment is connected to the extremities of the core. A lightning strikes the building, and the currents along the cable (shield and core), as well as the voltage at the extremes are examined. The results were compared with a MoM numerical tool, with good agreement and a significant better performance in terms of computational resources.
{"title":"Calculation of lightning transient voltages in cables considering a large industrial site using a FDTD thin wire model","authors":"L. Diaz, C. Miry, C. Guiffaut, N. Ticaud, A. Reineix","doi":"10.1109/SIPDA.2015.7339312","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339312","url":null,"abstract":"An efficient model to include thin wire structures in FDTD is used and validated in a lightning transient study on a buried cable in a realistic industrial site. The model is based on the thin wire formalism of Holland and permits to consider different types of structures: bare wires, single core insulated cables, and single core coaxial cables. The industrial site is composed by a building, a grounding grid, and a buried single core coaxial cable leaving the building. An equivalent electronic equipment is connected to the extremities of the core. A lightning strikes the building, and the currents along the cable (shield and core), as well as the voltage at the extremes are examined. The results were compared with a MoM numerical tool, with good agreement and a significant better performance in terms of computational resources.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"30 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":"126932055","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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