• Journal of Energy Engineering
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• v.12 no.4
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• pp.309-319
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• 2003

The main purpose of this paper is to present a simulation model for assessing the impacts of a variable speed wind turbine (VSWT) on the distribution network and perform a simulation analysis of volt-age profiles and harmonics along the wind turbine installed feeder using the presented model. The modeled wind energy conversion system consists of a fixed pitch wind turbine and a permanent-magnet synchronous generator, in which a controllable power electronics inverter performs variable speed operation and reactive power output control. Impact analysis on voltage profiles and harmonics of a VSWT-installed distribution feeder is addressed and simulated in terms of steady state and dynamic behaviors. Various capacities and different modes of variable speed wind turbines are simulated and investigated. Case studies demonstrate how feeder voltages are influenced by capacity and control modes of wind turbines and changes in wind speed under various network conditions, and show harmonic impacts on the feeder. Modeling and simulation analysis is based on PSCAD/EMTDC a software package.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1898-1903
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• 2010

The hold clamp which is for holding feeder distribution line in direct current can be lengthened its span of life by inserting insulators(EDPM rubber) through improving its function such as preventing damage from temperature change and electric corrosion. This paper reviews the development background, design, manufacture and performance assessment of the hold clamp inserting insulators to prevent circulating current.

• 전기의세계
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• v.22 no.6
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• pp.8-18
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• 1973

This paper is a part from the series study on the 22.9KVY multiground destribution system and its is divided into three parts as follow. A.C. Network Analyzer study on the load current flow when one phase line of the feeder is out of seroice because of cutting. A.C. Network Analyzer study on the increasing zero sequence current in the good feeders when one feeder is under fault of single phase short. Field test report of the common use of open telephone line on same poles of 22.9KVY distribution system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2003.11a
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• pp.107-109
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• 2003

This paper studies islanding detection distributed of distributed generation(DG). The study of islanding detection has been disconnected DG when power islanding was detected but fault type wasn't distingish. Nearby feeder fault the fault of feeder that not interconnected DG, is a little affect DG and distribution system. Therefore DG not need to disconnect distribution system. We studied islanding detection algorithm considering fault location.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.3
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• pp.491-497
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• 2007

As dispersed generators was driven in condition interconnecting with utility, it could cause a variety of new effects to the original distribution system that was running as considered only the one-way power flow. Therefore, the protection devices that is builted in distribution system should be designed to be able to operate with disposing of not only a fault of the generator, but also utility condition. Especially, the fault of the feeder interconnected with Dispersed Generator can cause the islanding phenomenon of open DG(Dispersed Generators). This phenomenon has many problems such as a machinery damage, electricity qualify degradation and a difficulty of the system recovery. In the fault therefore, we must separate Dispersed Generator from the system quickly. In this paper, for the fault classification of the interconnected DG and the outside feeder we judge the fault of the interconnected DG and the outside feeder in HMI through data provided by IED(Intelligent Electronic Device) on the network and decide whether it operates or not by sending the result to each relay.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.14_15
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• 2009

In this paper, the effect of SFCL which was applied on neutral line of main transformer in distribution substation was analyzed in addition to the position of SFCL among some cases which are studied. The result about the limiting current was compared with the effect with SFCL applied on feeder. The limiting current characteristics are similar to the effect of SFCL on feeder. Therefore, this application of SFCL is required to protection coordination such as SFCL is applied on feeder.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.125-127
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• 1999

We generally use Yes-No algorithms for feeder automation algorithm. This logic determines the faulty section by fault current detection information of the fault indicators of each switches in distribution feeder. This paper presents the data acquisition method such as breaker's open status in fault and the determination method of faulty section using fault indicator's information of each switches.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.841-843
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• 1998

The second project of the development of distribution automation system was started recently in Korea. We will use two algorithms for feeder automation in this project. The one is Yes/No logic and it will be applied in large city. Yes/No logic determined the faulty section by fault current following information of the fault indicators of each switches. The other is automatic closing process of switches, and it will be applied in rural area. In the latter method, each switches close systematically, and it can find and separate the faulty section, the computer system treats only the feeder reconfiguration finally.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.680-682
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• 1996

Korea Distribution Automation System(KODAS) has been designed and implemented for feeder automation using the paircable as communication media. And we bave been developed the telemetering system using the low voltage line. Kepco have been constructed approximately 60% of the Cable TV(CATV) networks in large city in Korea since 1995, so we have been researching the feeder automation based on CATV networks also. We will contruct the system using its in the area with of cable-TV networks and paircable line in the other area for communication media in future.

• Nuclear Engineering and Technology
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• v.40 no.1
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• pp.37-48
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• 2008

Flow fields inside feeder pipes have been simulated numerically using a CFD (computational fluid dynamics) code to calculate the shear stress distribution, which is the most important factor in predicting the local regions of feeder pipes highly susceptible to FAC (flow-accelerated corrosion)-induced wall thinning. The CFD approach, with schemes used in this study, to simulate the flow situations inside the CANDU feeder pipes has been verified as it showed a good agreement between the investigation results for the failed feedwater pipe at Surry unit 2 plant in the U.S. and the CFD calculation. Sensitivity studies of the three geometrical parameters, such as angle of the first and second bends, length of the first span between the grayloc hub and the first bend, and length of the second span between the first and the second bends have been performed. CFD analysis reveals that the local regions of feeder pipes of Wolsung unit 1 in Korea, on which wall thickness measurements have been performed so far, are not coincident with the worst regions predicted by the present CFD analysis located in the connection region of straight and bend pipe near the inlet part of the bend intrados. Finally, based on the results of the present CFD analysis, a guide to the selection of the weakest local positions where the measurement of wall thickness should be performed with higher priority has been provided.