• Title/Summary/Keyword: Electrical Substation System

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A Study on Real Time Catenary Impedance Estimation Technique using the Synchronized Measuring Data between Substation and Train (변전소와 차량간의 동기화를 통한 실시간 전차선로 임피던스 예측 기법 연구)

  • Jung, Hosung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.10
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    • pp.1458-1464
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    • 2013
  • This paper proposed a new real time catenary impedance estimation technique using synchronized power data from the measured data of operating vehicle and substation for catenary protective relay and fault locator setting. This paper presented estimation equation of catenary impedance using synchronized power data between substation and vehicle of AT feeding system for the performance verification of the proposed technique. Also AC feeding system is modeled through power analysis program and performance was verified through simulation according to various load changes. We verified that average 2.38%(distance equivalent 23.8 m) error appeared between the proposed estimation equation of catenary impedance and power analysis program simulation output in no connection double track system between up track and down track. Furthermore, We confirmed that estimation error is bigger depending on the increasing the distance from substation and vehicle impedance using only using vehicle current when calculating vehicle impedance in connection double track system between up track and down track. But, We confirmed that the proposed technique estimated accurately catenary impedance regardless of vehicle impedance and distance from substation.

R&D Trends of Substation Automation (변전소 종합 자동화 기술개발 동향)

  • Lee, Bong-Hee;Park, Soon-Kyu
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.548-550
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    • 2002
  • In this paper the domestic and worldwide trends of substation automation are described in order to cope with the coming new environment in this part On the world market of substation control it will be change from analog technology to digital technology. And the technology of a system integration relevant to a substation automation become more important than that of individual power apparatus. Therefore development of substation automation technology is needed.

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A Case of Reducing Grounding Resistance of 154KV Substation (154KV 변전소의 접지저항 저감대책 검토사례)

  • Kee, H.T.;Choi, J.K.;Jung, G.J.;On, D.H.
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2064-2067
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    • 2000
  • In our country, most region is composed of mountains and people have recently been displeased with the construction of the substations in their vicinity so the substations newly built are mainly constructed with GIS system in the small area that has high soil resistivity near mountain. Therefore, nowadays the design of substation grounding system has been difficult, and the additional considerations are needed. UC substation was also difficult to design the grounding system because of so small substation area and high soil resistivity. This paper shows the examples of reducing the grounding system resistance reasonably by using several ways. Designing the ground grid electrode in the access road, deep electric earth probe, changing the substation soil with the law level resistivity soil. This report deals with the computer simulation of the grounding system resistance about the ways illustrated above.

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A Study on Design of Optimal Location and Capacity of DC Substation for Mass Transit System (전철용 직류변전소의 최적 위치 및 용량 설계에 관한 연구)

  • Kim, J.K.;Lee, S.D.;Baek, B.S.;Lee, H.D.;Lee, J.Y.
    • Proceedings of the KIEE Conference
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    • 2000.11b
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    • pp.398-401
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    • 2000
  • This paper describes the design of optimal location and capacity of DC substation for Mass Transit System. Three factors are considered for the design i.e. substation arrangements, line configuration and substation power capacity. In this study, we considered all of them for capacity calculation of power supply system for MTS. At first, DC-fed-traction system is introduced on an outline, a characteristics of train and fed network, and design method of substation arrangements. Optimal design procedures are described, and program for capacity calculation of the system is presented. In addition, the computer simulated results are compared with the conventional simple calculation method.

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Study on IEC 61850 Performance Testing Procedures of BF Protection IED (차단키 실패 보호 IED의 IEC 61850 시스템 성능 시험 절차서에 관한 연구)

  • Lee, Nam-Ho;Jang, Byung-Tae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.8
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    • pp.59-66
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    • 2008
  • Korea Electric Power Research Institute in charge of the power IT project "Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology" is performing system verification. Breaker Failure protection IED can operate protection activity by communicating with other IEDs such as T/L IED, owing to IEC 61850 international standard and digital substation automation system. Accordingly, IED testing process should be changed from the conventional way by electrical contact test on individual IED to system based testing method by network communication. This paper describes how to test BF IED based on substation automation system and testing procedures using UML, which is used to implement S/W design.

Planning for Construction and Expanding of Distribution Substation Considering Contingency (상정사고를 고려한 배전용 변전소 신,증설 계획 수립)

  • Choi, Sang-Bong;Kim, Dae-Kyeong;Jeong, Seong-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.7
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    • pp.303-308
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    • 2001
  • This paper presents algorithm to plan construction and expanding of substation considering contingency accidents by proposing utilization factor according to configuration of substation bank system. In this paper, firstly, proper sphere of supply area by each district which could be standardized with respect to its supply capacity is established under assumption of long term load forecasting. Secondly, goal of utilization ratio based on configuration of substation bank was set to keep reliability by remaining sound bank when it happen to one bank accidents. Finally, it is set up for optimal construction and expanding of substation considering economy and reliability simultaneously about substation to exceed these ratio. To verify proposed algorithm, at first, after adopting a part of Kangnam area in Seoul as area for testing, it is divided into several regions for this area according to power branches of power utility. Secondly, by deriving correlation factor between load demand and economic indicators in these region respectively, the regional load forecasting was performed with economic growth and city plan scenario. Finally, based on the predicted load demand by region and land use data which is identified from air-photographic, the load demand by district was predicted. Also, planning for substation considering contingency is formulated to expand taking into account computing utilization factor which is based on configuration of substation bank respectively.

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A Study on Substation Automation in Power System (전력계통의 변전소 자동화에 대한 연구)

  • Moon, Hyoung-Bae;Lim, Seong-Joo;Lee, Sang-Joong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2005.11a
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    • pp.119-124
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    • 2005
  • The deregulation of energy market, together with structure reorganization of vertically integrated companies in electrical utility requires efficient and reliable substation automation system. The problem of non-standards where other countries suffer through the SA points could be settled using IEC 61850 and hereby the coming SAS project can realize the system that characterize the telecommunication standards and function integration.

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Study on the Testing Procedures of IED System Performance based on IEC 61850 (IEC 61850 기반 IED 시스템 성능 시험 절차서에 관한 연구)

  • Lee, Nam-Ho;Jang, Byung-Tae
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1-2
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    • 2008
  • Korea Electric Power Research Institute has carried out verification of communication conformance on IEC 61850 based IEDs related to power IT project "Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology". Owing to IEC 61850 international standard and digital substation automation system, IED testing process should be changed from the conventional way to the new way described in the paper. This paper describes IED testing procedures based on substation automation system using UML.

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Development of the Preventive Diagnostic System for Substation (변전소 예방진단시스템 데이터 취득장치 개발)

  • Shim, J.T.;Sim, S.M.;Kweon, D.J.;Choi, I.H.;Jung, G.J.
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.428-430
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    • 2001
  • This paper describes development of a preventive diagnostic system for the substation equipments. Data acquisition system, communication control unit and computer systems have been developed in the recent 2 years. The developed system is operating in 345kV U-Ryung substation for performance and environment tests.

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Analysis of Harmonic Effects on Substation Power System and its Countermeasure (지하철 전력계통의 고조파 영향 분석 및 그 대책에 관한 연구)

  • Song, Jin-Ho;Hwang, Yu-Mo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.4
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    • pp.210-220
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    • 2002
  • We analysised the effect of harmonics on electric machines of substation power system barred on quantitatively measured harmonics and proposed the methods for prevention of harmonics through checking on transformer, rectifier and cable's capacities against harmonics with reference to KEPCO's electricity service standard. In order to analysis harmoninics of silicon rectifier that is power source in DC substation, computer simulations for a substation with TR of high voltage distribution switchboard are performed. Simulation results show that the total harmonic distortion factor becomes smaller for TR primary and receiving points in order rather than silicon rectifier which is harmonic generation source so that the harmonics generated frets each rectifier are outflowed to power supply and high voltage distribution switchboard The result of higher distortion factors of voltage and current for rectifier with 100% load than those with 50 % and 30% indicates that the waveform of voltage and current for the real substation power system at the office-going and the closing hours with heavy loads might be more distorted. As proposed methods for harmonic reduction, the conventional 6 pulse-type for substation is required to be replaced by 12 pulse-type for reduction of 5th and 7th harmonics. The active filter rather than the passive filter is more effective due to severe variance of rectifier loads, but the high cost is price to be paid. In view of installation area and costs, the use of 12 pulse-type transformer is desirable and then the parallel transformer and the rectifier within the substation must be replaced at the same time. Other substations with parallel feeder can use 6 pulse-type transformer.