Pub Date : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.583
J. Hyun, Jae-Sil Heo, Doo-young Kim, M. Park
The high-temperature steam pipes of thermal power plants are subjected to severe conditions such as creep and fatigue due to the power plant frequently being started up and shut down. To prevent critical pipes from serious damage and possible failure, inspection methods such as computational analysis and online piping displacement monitoring have been developed. However, these methods are limited in that they cannot determine the life consumption rate of a critical pipe precisely. Therefore, we set out to develop a life assessment system, based on a three-dimensional piping displacement monitoring system, which is capable of evaluating the life consumption rate of a critical pipe. This system was installed at the “M” thermal power plant in Malaysia, and was shown to operate well in practice. The results of this study are expected to contribute to the increase safety of piping systems by minimizing stress and extending the actual life of critical piping.
{"title":"Development for Life Assessment System for Pipes of Thermal Power Plants","authors":"J. Hyun, Jae-Sil Heo, Doo-young Kim, M. Park","doi":"10.18770/KEPCO.2016.02.04.583","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.583","url":null,"abstract":"The high-temperature steam pipes of thermal power plants are subjected to severe conditions such as creep and fatigue due to the power plant frequently being started up and shut down. To prevent critical pipes from serious damage and possible failure, inspection methods such as computational analysis and online piping displacement monitoring have been developed. However, these methods are limited in that they cannot determine the life consumption rate of a critical pipe precisely. Therefore, we set out to develop a life assessment system, based on a three-dimensional piping displacement monitoring system, which is capable of evaluating the life consumption rate of a critical pipe. This system was installed at the “M” thermal power plant in Malaysia, and was shown to operate well in practice. The results of this study are expected to contribute to the increase safety of piping systems by minimizing stress and extending the actual life of critical piping.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122840584","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.615
J. Soh, M. W. Lee, Su‐Kyung Kim, Dohyung Kim
Electrochemical noise(EN) has been used to analyze the deterioration of coating films of offshore wind substructures. In this study, prototype sensors using EN have been developed to detect the corrosion rate. To verify the reliability of sensors, experiments were conducted both in the laboratory and offshore using probe and standard samples. New analysis and data processing techniques show that the sensor can provide useful information about the corrosion rate.
{"title":"Corrosion Monitoring for Offshore Wind Farm's Substructures by using Electrochemical Noise Sensors","authors":"J. Soh, M. W. Lee, Su‐Kyung Kim, Dohyung Kim","doi":"10.18770/KEPCO.2016.02.04.615","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.615","url":null,"abstract":"Electrochemical noise(EN) has been used to analyze the deterioration of coating films of offshore wind substructures. In this study, prototype sensors using EN have been developed to detect the corrosion rate. To verify the reliability of sensors, experiments were conducted both in the laboratory and offshore using probe and standard samples. New analysis and data processing techniques show that the sensor can provide useful information about the corrosion rate.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117173161","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.595
J. H. Lee, Beom-Ju Kim, No-Sang Kwak, Jung-Hyun Lee, S. Shin, Sun-Na Hwang, J. Shim
다상 고정층 촉매반응기 (Multiphase catalytic fixed-bed reactor) 에서 기체 따른 feed 가스의 분산성 변화를 분석하였다 . 다상
分析了多相固定层催化反应器中feed气体随气体的分散性变化。”奖
{"title":"Enhancement of Feed Gas Distribution of Heterogeneous Catalytic Fixed-bed Reactor","authors":"J. H. Lee, Beom-Ju Kim, No-Sang Kwak, Jung-Hyun Lee, S. Shin, Sun-Na Hwang, J. Shim","doi":"10.18770/KEPCO.2016.02.04.595","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.595","url":null,"abstract":"다상 고정층 촉매반응기 (Multiphase catalytic fixed-bed reactor) 에서 기체 따른 feed 가스의 분산성 변화를 분석하였다 . 다상","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128533245","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.543
Joon-Young Park, Jae-Kyung Lee, Seok-Tae Kim
Live-line maintenance for electric power lines is very dangerous because of their ultra-high voltage environments and the risks of falling from heights. Recently, drone technology has been spotlighted due to its maneuverability and stable controllability, and has been being applied to maintenance works in the electric power industry. This paper presents a new type of drone that can be transformable by introducing biomimetics to its mechanism and can run on an overhead ground wire as well as it can fly. Its technical feasibility was confirmed through experiments.
{"title":"Technical Feasibility Study on the Biomimetic Drone for Inspection of Electric Power Lines","authors":"Joon-Young Park, Jae-Kyung Lee, Seok-Tae Kim","doi":"10.18770/KEPCO.2016.02.04.543","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.543","url":null,"abstract":"Live-line maintenance for electric power lines is very dangerous because of their ultra-high voltage environments and the risks of falling from heights. Recently, drone technology has been spotlighted due to its maneuverability and stable controllability, and has been being applied to maintenance works in the electric power industry. This paper presents a new type of drone that can be transformable by introducing biomimetics to its mechanism and can run on an overhead ground wire as well as it can fly. Its technical feasibility was confirmed through experiments.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117207058","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.563
Alaaddin Al-Shidaifat, C. Jayawickrama, Sung-hyun Ji, V. Nguyen, Yoo-Jin Kwon, Hanjung Song
{"title":"Microcontroller-based Chaotic Signal Generator for Securing Power Line Communication: Part I-A System View","authors":"Alaaddin Al-Shidaifat, C. Jayawickrama, Sung-hyun Ji, V. Nguyen, Yoo-Jin Kwon, Hanjung Song","doi":"10.18770/KEPCO.2016.02.04.563","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.563","url":null,"abstract":"","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115623719","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.601
Dae-min Heo, Hoe-Gu Kim, Bok-Hee Lee
The electrical characteristics of the soil where a ground electrode is buried vary with regions, seasons and environmental factors. Electrical discharge in the vicinity of the ground electrode will occur differently and significantly affect the performance of the grounding system. It is necessary to analyze discharge and ionization characteristics of soils when the grounding system is designed. The aims of this investigation are to understand correlation between the soil ionization and the transient ground impedance. This paper presents the experimental results on the soil ionization parameters and the transient ground resistance due to the soil ionization around a hemispherical ground electrode stressed by lightning impulse voltages.
{"title":"Soil Ionization Phenomena around a Hemispherical Electrode Stressed by Impulse Voltages","authors":"Dae-min Heo, Hoe-Gu Kim, Bok-Hee Lee","doi":"10.18770/KEPCO.2016.02.04.601","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.601","url":null,"abstract":"The electrical characteristics of the soil where a ground electrode is buried vary with regions, seasons and environmental factors. Electrical discharge in the vicinity of the ground electrode will occur differently and significantly affect the performance of the grounding system. It is necessary to analyze discharge and ionization characteristics of soils when the grounding system is designed. The aims of this investigation are to understand correlation between the soil ionization and the transient ground impedance. This paper presents the experimental results on the soil ionization parameters and the transient ground resistance due to the soil ionization around a hemispherical ground electrode stressed by lightning impulse voltages.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126462714","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.525
Won Yang
바이오매스 혼소는 신재생 에너지의 비중을 늘리면서 석탄화력발전에서의 $CO_2$ 배출을 저감할 수 있는 단중기적으로 가장 효과적인 방법이다. 본 논문에서는 이 중 기존 화력발전소에 가장 적은 초기투자비로 적용할 수 있는 직접 혼소법에 대하여 주로 고찰을 수행하고, 국내외 현황 및 전망에 대해 기술하였다. 직접 ...
{"title":"Status and Perspective of Biomass Co-firing to Pulverized Coal Power Plants","authors":"Won Yang","doi":"10.18770/KEPCO.2016.02.04.525","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.525","url":null,"abstract":"바이오매스 혼소는 신재생 에너지의 비중을 늘리면서 석탄화력발전에서의 $CO_2$ 배출을 저감할 수 있는 단중기적으로 가장 효과적인 방법이다. 본 논문에서는 이 중 기존 화력발전소에 가장 적은 초기투자비로 적용할 수 있는 직접 혼소법에 대하여 주로 고찰을 수행하고, 국내외 현황 및 전망에 대해 기술하였다. 직접 ...","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123774683","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 : 2016-12-30DOI: 10.18770/KEPCO.2016.02.04.609
Eui-han Jeong, Changju Yang, Seung-ho Han, Hyongsuk Kim
{"title":"Battery Cell Balancing with Hybrid Architecture of Serial and Parallel Charging","authors":"Eui-han Jeong, Changju Yang, Seung-ho Han, Hyongsuk Kim","doi":"10.18770/KEPCO.2016.02.04.609","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.04.609","url":null,"abstract":"","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134120844","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 : 2016-09-30DOI: 10.18770/KEPCO.2016.02.03.469
J. Jin, Dong-Hyun Kim, Minuk Jung
As we are facing the shortage of oil energy, studies on renewable energy, wind energy research has been naturally getting attention. Among wind energies, ocean wind energy is relatively abundant compared to land wind energy and therefore, is getting much attention in terms of its efficiency. However, the problem is the cost. Generally, the cost ratio of the supporting structure is over 25% of the total installation cost of a offshore wind turbine system. Thus, it is very important to reduce the total installation cost of the offshore wind turbine and develop accurate analysis methodology for various offshore wind turbine foundations. In this study, nonlinear structure-soil interaction analyses have been proposed and conducted for the typical suction bucket model of an offshore wind turbine foundation,
{"title":"Nonlinear Structure-Soil Interaction Analysis for the Suction Bucket Foundation of Offshore Wind-Turbine","authors":"J. Jin, Dong-Hyun Kim, Minuk Jung","doi":"10.18770/KEPCO.2016.02.03.469","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.03.469","url":null,"abstract":"As we are facing the shortage of oil energy, studies on renewable energy, wind energy research has been naturally getting attention. Among wind energies, ocean wind energy is relatively abundant compared to land wind energy and therefore, is getting much attention in terms of its efficiency. However, the problem is the cost. Generally, the cost ratio of the supporting structure is over 25% of the total installation cost of a offshore wind turbine system. Thus, it is very important to reduce the total installation cost of the offshore wind turbine and develop accurate analysis methodology for various offshore wind turbine foundations. In this study, nonlinear structure-soil interaction analyses have been proposed and conducted for the typical suction bucket model of an offshore wind turbine foundation,","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126127100","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 : 2016-09-30DOI: 10.18770/KEPCO.2016.02.03.461
S. Hong, Donghyun Kim, Sin-Cheul Kang, K. Kang
In order to install the floating transport type wind-turbine foundation, water pumping is used to sink the foundation. During this process, its mass and center of gravity, and buoyancy center become continuously changed so that the dynamic stability of the floating foundation become unstable. Dynamic stability analysis of the floating foundation is a complex problem since it should take into account not only the environmental wave, wind, and current loads but also its weight change effect simultaneously considering six-degree-of-freedom motion. In this study, advanced numerical method based on the coupled computational fluid dynamics (CFD)
{"title":"Dynamic Stability Analysis of Floating Transport Wind-Turbine Foundation Considering Internal Fluid Sloshing Effect","authors":"S. Hong, Donghyun Kim, Sin-Cheul Kang, K. Kang","doi":"10.18770/KEPCO.2016.02.03.461","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.03.461","url":null,"abstract":"In order to install the floating transport type wind-turbine foundation, water pumping is used to sink the foundation. During this process, its mass and center of gravity, and buoyancy center become continuously changed so that the dynamic stability of the floating foundation become unstable. Dynamic stability analysis of the floating foundation is a complex problem since it should take into account not only the environmental wave, wind, and current loads but also its weight change effect simultaneously considering six-degree-of-freedom motion. In this study, advanced numerical method based on the coupled computational fluid dynamics (CFD)","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"134 34","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113940104","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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