Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356924
P. Chiradeja, C. Pothisarn
This paper proposes a technique to detect fault locations in a three-bus transmission system using discrete wavelet transform (DWT). The comparison among the first peak time in first scale of each terminal (buses) that can detect fault is performed and the two fastest first peak time obtained from comparison are used as an input data for traveling wave equation later. A comparison of results obtained from three different types of mother wavelet is discussed in order to identify the fault locations with an application of traveling wave theory. It is shown that the db4 mother wavelet produces better results than those from ‘sym4’ and ‘coif4’, with a mean error of less than 400 m.
{"title":"Identification of the fault location for three-terminal transmission lines using discrete wavelet transforms","authors":"P. Chiradeja, C. Pothisarn","doi":"10.1109/TD-ASIA.2009.5356924","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356924","url":null,"abstract":"This paper proposes a technique to detect fault locations in a three-bus transmission system using discrete wavelet transform (DWT). The comparison among the first peak time in first scale of each terminal (buses) that can detect fault is performed and the two fastest first peak time obtained from comparison are used as an input data for traveling wave equation later. A comparison of results obtained from three different types of mother wavelet is discussed in order to identify the fault locations with an application of traveling wave theory. It is shown that the db4 mother wavelet produces better results than those from ‘sym4’ and ‘coif4’, with a mean error of less than 400 m.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130348660","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356814
T. Tran, V. Tran, PhanTu Vu, Jeongje Park, Jaeseok Choi
This paper proposes a practical method for transmission expansion planning. This method suggests the optimization grid planning by integer programming using branch and bound method, which utilizes a network flow approach and the maximum flow-minimum cut set theorem to minimize investment budget of transmission line construction and subject to deterministic criterion using a program Cmexp. For. The timing priority of new line construction is determined on the comparison of probabilistic reliability indices of each new system using TRELSS 6.2 program. The new power system is verified an operation conditions as like as the power system stability by using a PowerWorld program. The proposed method has been tested on IEEE-MRTS.
{"title":"A practical method for tranmission expansion planning","authors":"T. Tran, V. Tran, PhanTu Vu, Jeongje Park, Jaeseok Choi","doi":"10.1109/TD-ASIA.2009.5356814","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356814","url":null,"abstract":"This paper proposes a practical method for transmission expansion planning. This method suggests the optimization grid planning by integer programming using branch and bound method, which utilizes a network flow approach and the maximum flow-minimum cut set theorem to minimize investment budget of transmission line construction and subject to deterministic criterion using a program Cmexp. For. The timing priority of new line construction is determined on the comparison of probabilistic reliability indices of each new system using TRELSS 6.2 program. The new power system is verified an operation conditions as like as the power system stability by using a PowerWorld program. The proposed method has been tested on IEEE-MRTS.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130453395","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356916
Wu Zhihua, Li Zewen, Qin Xiao'an, Hu Xiang, Zeng Xiangjun
Quick and accurate location of faults is the basic task of fault location as well as an important research subject in power system relay protection. The traveling wave principles of double terminal fault locating method is described, and the main causes of the generation of errors in actual application are investigated. A novel double terminal fault locating method is presented based on the existing fault locating method. The arriving intervals of the travelling wave from the fault location, reflected wave from fault location and reflected wave from opposite bus are recorded. The new fault location method is applied in Zhuzhou power grid, and the results show that it has high Location accuracy.
{"title":"A novel double terminal traveling wave fault location method not influenced by wave speed","authors":"Wu Zhihua, Li Zewen, Qin Xiao'an, Hu Xiang, Zeng Xiangjun","doi":"10.1109/TD-ASIA.2009.5356916","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356916","url":null,"abstract":"Quick and accurate location of faults is the basic task of fault location as well as an important research subject in power system relay protection. The traveling wave principles of double terminal fault locating method is described, and the main causes of the generation of errors in actual application are investigated. A novel double terminal fault locating method is presented based on the existing fault locating method. The arriving intervals of the travelling wave from the fault location, reflected wave from fault location and reflected wave from opposite bus are recorded. The new fault location method is applied in Zhuzhou power grid, and the results show that it has high Location accuracy.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131815066","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5357025
M. Urayama, K. Miyake, K. Takahashi, M. Kawada, S. Fukushima, A. Otsuka, T. Mochizuki
This paper describes an investigation of grease degradation of aged GCBs. Risk of depletion on conducting contacts due to grease degradation in particular was identified in field data. In addition, it was found that grease oil evaporation and abrasion dust infiltration were proportional to ages and numbers of operations respectively. It was also found that grease degradation promoted abrasion in silver-plating on sliding contacts, reaching the abnormal abrasion domain for aged equipment, which increased equipment failure risk. Meanwhile, replacement criteria were organized with asset management based on risk evaluation.
{"title":"Evaluation of deterioration in aged GCBs and study on equipment replacement criteria","authors":"M. Urayama, K. Miyake, K. Takahashi, M. Kawada, S. Fukushima, A. Otsuka, T. Mochizuki","doi":"10.1109/TD-ASIA.2009.5357025","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5357025","url":null,"abstract":"This paper describes an investigation of grease degradation of aged GCBs. Risk of depletion on conducting contacts due to grease degradation in particular was identified in field data. In addition, it was found that grease oil evaporation and abrasion dust infiltration were proportional to ages and numbers of operations respectively. It was also found that grease degradation promoted abrasion in silver-plating on sliding contacts, reaching the abnormal abrasion domain for aged equipment, which increased equipment failure risk. Meanwhile, replacement criteria were organized with asset management based on risk evaluation.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133859567","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356965
Jeongje Park, Wu Liang, Jaeseok Choi, D. Jeon, T. Tran, R. Billinton
The importance and conducting necessity studies on grid reliability evaluation have been increasingly important in recent years due to the number of black-out events occurring through in the world. Quantity evaluation of transmission system reliability is very important in a competitive electricity environment. The reason is that the successful operation of electric power under a deregulated electricity market depends on transmission system reliability management. Also in Korea it takes places. The results of many case studies for the KEPCO system using the Transmission Reliability Evaluation for Large-Scale Systems (TRELSS) Version 6_2, a program developed by EPRI are introduced in this paper. Some sensitivity analysis has been included in case study. This paper presents the reliability analysis of KEPCO system expansion planning, fourth supply plan, by using TRELSS program.
{"title":"Reliability evaluation of grid in Korea: Fourth supply plan","authors":"Jeongje Park, Wu Liang, Jaeseok Choi, D. Jeon, T. Tran, R. Billinton","doi":"10.1109/TD-ASIA.2009.5356965","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356965","url":null,"abstract":"The importance and conducting necessity studies on grid reliability evaluation have been increasingly important in recent years due to the number of black-out events occurring through in the world. Quantity evaluation of transmission system reliability is very important in a competitive electricity environment. The reason is that the successful operation of electric power under a deregulated electricity market depends on transmission system reliability management. Also in Korea it takes places. The results of many case studies for the KEPCO system using the Transmission Reliability Evaluation for Large-Scale Systems (TRELSS) Version 6_2, a program developed by EPRI are introduced in this paper. Some sensitivity analysis has been included in case study. This paper presents the reliability analysis of KEPCO system expansion planning, fourth supply plan, by using TRELSS program.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124081250","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356957
M. Kezunovic
The latest technology development makes many intelligent electronic devices (IEDs) available in substations today. This brings an opportunity for adding new functionalities that go well beyond what the traditional substation automation solutions have provided. The substation automation role in automated fault analysis may be expanding towards better serving many utility groups: operations, protection and asset management.
{"title":"Automated fault analysis in a smart grid","authors":"M. Kezunovic","doi":"10.1109/TD-ASIA.2009.5356957","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356957","url":null,"abstract":"The latest technology development makes many intelligent electronic devices (IEDs) available in substations today. This brings an opportunity for adding new functionalities that go well beyond what the traditional substation automation solutions have provided. The substation automation role in automated fault analysis may be expanding towards better serving many utility groups: operations, protection and asset management.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124209843","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5357024
T. Koshizuka, H. Kusuyama, M. Saito, H. Maehara, Y. Sato, H. Toda
When an unloaded transformer is being energized, a large inrush current may flow depending upon the residual flux in the core of the transformer and the closing phase of the circuit breaker. A large inrush current may cause voltage fluctuations in the transmission system. One method of suppressing the inrush current is to perform controlled switching of the circuit breaker. In this paper, a new method of controlled switching of a 3-phase transformer in an isolated neutral system was examined. A method employing 3-phase circuit breakers with one operating mechanism and also single phase circuit breakers was used to devise a method of control switching for suppressing inrush current when the transformer is energized. In experiment using a 3 kV transformer, actual inrush currents were greatly suppressed.
{"title":"Controlled switching for energizing 3-phase transformers in isolated neutral system","authors":"T. Koshizuka, H. Kusuyama, M. Saito, H. Maehara, Y. Sato, H. Toda","doi":"10.1109/TD-ASIA.2009.5357024","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5357024","url":null,"abstract":"When an unloaded transformer is being energized, a large inrush current may flow depending upon the residual flux in the core of the transformer and the closing phase of the circuit breaker. A large inrush current may cause voltage fluctuations in the transmission system. One method of suppressing the inrush current is to perform controlled switching of the circuit breaker. In this paper, a new method of controlled switching of a 3-phase transformer in an isolated neutral system was examined. A method employing 3-phase circuit breakers with one operating mechanism and also single phase circuit breakers was used to devise a method of control switching for suppressing inrush current when the transformer is energized. In experiment using a 3 kV transformer, actual inrush currents were greatly suppressed.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124463209","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5357021
K. Lee, J. Duart, R. Cheng, P. Shieh
The purpose of this paper is to provide an update on recent developments of fluid-filled distribution transformers that combine advanced materials like amorphous core, high temperature solid insulation, and alternative fluids with improved environmental impact. An example of a transformer integrating those materials will be described. Aging studies to understand relative behavior of a particular high temperature solid insulating material in various alternative fluids have been conducted to understand influence of parameters like air or temperature. Tensile properties have been measured on aged samples to understand compatibility between solid insulation and fluids.
{"title":"Advanced materials application in fluid-filled transformer","authors":"K. Lee, J. Duart, R. Cheng, P. Shieh","doi":"10.1109/TD-ASIA.2009.5357021","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5357021","url":null,"abstract":"The purpose of this paper is to provide an update on recent developments of fluid-filled distribution transformers that combine advanced materials like amorphous core, high temperature solid insulation, and alternative fluids with improved environmental impact. An example of a transformer integrating those materials will be described. Aging studies to understand relative behavior of a particular high temperature solid insulating material in various alternative fluids have been conducted to understand influence of parameters like air or temperature. Tensile properties have been measured on aged samples to understand compatibility between solid insulation and fluids.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127897440","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356951
C. Chu, Hung-Chi Tsai, Chunfang Liu, Yuan-Zheng Lin
Recent studies about Taiwan power system indicate that this system exhibited voltage stability problems under severe N-2 contingencies in heavily loaded hours. We will report feasibility studies of using STATCOM to mitigate this problem. The singular value decomposition method will be utilized to identify weakest buses for STATCOM placement. The required rating is determined by planning criteria. Three enhancement strategies will be investigated. The preference order of enhancement strategies are also discussed.
{"title":"Applications of STATCOMs for voltage security enhancements in Taiwan power system","authors":"C. Chu, Hung-Chi Tsai, Chunfang Liu, Yuan-Zheng Lin","doi":"10.1109/TD-ASIA.2009.5356951","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356951","url":null,"abstract":"Recent studies about Taiwan power system indicate that this system exhibited voltage stability problems under severe N-2 contingencies in heavily loaded hours. We will report feasibility studies of using STATCOM to mitigate this problem. The singular value decomposition method will be utilized to identify weakest buses for STATCOM placement. The required rating is determined by planning criteria. Three enhancement strategies will be investigated. The preference order of enhancement strategies are also discussed.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121058285","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 : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356889
Shouzhen Zhu, Lin Geng, Jinghong Zheng, Xiaoyu Wang, Daehee Choi, Yang Li
Recently, DG(Distributed Generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the grounding requirements in the distribution networks. Through theory analysis and simulation, optimal selection methods are proposed. Yg/Δ-connection transformer is suitable for small resistance grounding distribution networks while Δ /Yg and Δ / Δ connection transformers are fit for small current neutral grounding networks. The conclusions are useful for the DG-connected power system.
{"title":"Selection method of transformer interconnecting distributed generation and distribution networks","authors":"Shouzhen Zhu, Lin Geng, Jinghong Zheng, Xiaoyu Wang, Daehee Choi, Yang Li","doi":"10.1109/TD-ASIA.2009.5356889","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356889","url":null,"abstract":"Recently, DG(Distributed Generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the grounding requirements in the distribution networks. Through theory analysis and simulation, optimal selection methods are proposed. Yg/Δ-connection transformer is suitable for small resistance grounding distribution networks while Δ /Yg and Δ / Δ connection transformers are fit for small current neutral grounding networks. The conclusions are useful for the DG-connected power system.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121174778","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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