• 제목/요약/키워드: digital relay

검색결과 272건 처리시간 0.021초

직류급전시스템 시험적용 사례를 통한 디지털 직류 보호계전기에 관한 연구 (A Study on the Digital DC Protection Relay through with Field Adoption Test in the DC Distribution System)

  • 고인석;차광석;민병훈
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권12호
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    • pp.646-652
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    • 2006
  • This study identifies the comparison of Technical specification and Characteristics of DC Protection Relay(ETCPU200) used in DC Distribution System in Korea. ETCPU200 has completed Field Test and approved its capability by finding out causes of recent operations through lately developed digital DC protection relay in parallel operation at Maebong-Substation, Sangbong-Substation, Nakseongdae-Substation, Euljirosaga-Substation, Jegi-Substation and Chongyangri T/P area. It also examines additional features for efficient System Analysis and Operations.

송전선보호계전기 시험을 위한 RTDS센서의 2회선 송전선로 Model구축 및 동특성시험 (Dynamic Characteristics Test and Test Model Establish on Double Circuit for Protective Relay Test Using Real Time Digital Simulator)

  • 정창호;이재규;윤남선;안복신;김석일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 D
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    • pp.1038-1040
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    • 1997
  • This paper describes dynamic characteristics test of distance relay and current differential relay using Real Time Digital Simulator on double circuit transmission line. First, The double circuit T/L modeling on RTDS was proposed and the results from the proposed model were compared with those of PSS/E. This comparison shows the possibility of dynamic test using the RTDS. The relay included about 20 test items which are apt to include maloperation of protective relays in critical situations.

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Comparing Impact of STATCOM and SSSC on the Performance of Digital Distance Relay

  • Ghorbani, Amir
    • Journal of Power Electronics
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    • 제11권6호
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    • pp.890-896
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    • 2011
  • In this paper the impact of a SSSC and a STATCOM on the impedance calculated by a distance relay is investigated. Both analytical analysis and simulations are provided. The STATCOM/SSSC control systems are modeled in detail. It is demonstrated that a SSSC has a greater impact on the calculated impedance by an A-G distance relay element. Several scenarios are considered in the simulations like the impact of the fault conditions, the compensator settings, the power system conditions and so on. All the simulations are carried out in MATLAB/Simulink with detailed models of the SSSC and the STATCOM.

디지털 거리계전기의 Zone 설정에 관한 연구 (A Study on the Zone Setting of Digital Distance Relay)

  • 이재규;정창호;정병태;안복신;김석일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 C
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    • pp.946-948
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    • 1998
  • The distance relay is very important for transmission line protection. A quadrilateral zone shape is used mainly for a modern digital distance relay. The shape of quadrilateral is vendor specific. At the stage of design, the shape is determined considering all possible types of faults and diverse configurations of system. Also this type relay must be designed to avoid the operation by a sound phase at single-Phase-to-ground fault, by a sound phase at two-phase-to-ground fault. The effect of a source impedance and a load impedance is another important factor to design. In this paper, a reliable zone shape which is appropriate for the KEPCO's transmission system is provided.

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Adaptive undervoltage protection scheme for safety bus in nuclear power plants

  • Chang, Choong-koo
    • Nuclear Engineering and Technology
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    • 제54권6호
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    • pp.2055-2061
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    • 2022
  • In the event of a short-circuit accident on a 4.16 kV non-safety bus, the voltage is temporarily lowered as backflow occurs on the safety bus. In such cases, the undervoltage relay of the safety bus shall not pick up the undervoltage so as not to interfere with the operation of the safety motors. The aim of this study is to develop an adaptive undervoltage protection scheme for the 4.16 kV safety bus considering the faults on the 13.8 kV and 4.16 kV non-safety buses connected to secondary windings of the three winding transformers, UAT and SAT. The result of this study will be the adaptive undervoltage protection scheme for the safety bus of nuclear power plants satisfying functional requirements of the safety related medium voltage motors. The adaptive undervoltage protection scheme can be implemented into an integrated digital protective relay to make user friendly and reliable protection scheme.

연계선로 보호계전기 개발 (Development of Interconnection Protective Relay)

  • 박경원;안홍선;신종한;박장수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 하계학술대회 논문집 A
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    • pp.311-313
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    • 2003
  • There have been public attraction and studies about distributed generation systems. But protective relay must be installed between utility system and customer owned distributed generation system has not been developed. So this paper describes the development of a digital protective relay for interconnection. The developed protective relay includes protective elements required by KEPCO at the interconnection point.

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High Capacity Relay Protocols for Wireless Networks

  • Fan, Yijia;Krikidis, Ioannis;Wang, Chao;Thompson, John S.;Poor, H. Vincent
    • Journal of Communications and Networks
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    • 제11권2호
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    • pp.196-206
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    • 2009
  • Over the last five years, relaying or multihop techniques have been intensively researched as means for potentially improving link performance of wireless networks. However, the data rates of relays are often limited because they cannot transmit and receive on the same frequency simultaneously. This limitation has come to the attention of researchers, and recently a number of relay techniques have been proposed specifically to improve the data efficiency of relaying protocols. This paper surveys transmission protocols that employ first single relays, then multiple relays and finally multiple antenna relays. A common feature of these techniques is that novel signal processing techniques are required in the relay network to support increased data rates. This paper presents results and discussion that highlight the advantages of these approaches.

중용량 전동기보호를 위한 전류형 디지털 보호계전기 개발 (Development of Current-based Compact Digital Protective Relay for Induction Motor Protection)

  • 정종진;김중표;신종한;박장수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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    • pp.140-142
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    • 2005
  • This paper describes the current- based compact digital motor protective relay for low and high voltage induction motors, which are widely used in industrial and commercial power systems. The existing protective relays for motor protection had only overload, short circuit, reverse phase, open circuit and grounding protective elements, and measurement, start/stop control function. But in present day, for automation system, various functions are required, especially motor management and sequence control function and more. To meet these requirements, we developed an economic current-based compact digital motor protective relay which had various function to control, manage and monitor the induction motor.

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디지털 계전기에 변전소 자동화 프로토콜 (IEC 61850) 적용에 관한 연구 (Application study of substation automation protocol (IEC 61850) to digital relay)

  • 임성정;최항섭;민병운;박동호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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    • pp.489-491
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    • 2005
  • This paper presents the application study of substation automation protocol, IEC 61850 to digital relay (HiMAP). Especially, it implements the data modeling, ACSI definition, GOOSE, MSVCB and data service required in the existing digital relay. To verify the system performance, we develop the process emulator and HiMAP emulator, and describe the results.

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분산전원 보호용 디지털 보호계전기 개발 (Development of the digital protection relay for protecting distributed generation)

  • 조철희;이병호;오의석;고철진;강상희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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    • pp.181-183
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    • 2005
  • The existing distribution networks are growing with an increase of power demand more and more. Therefore, for efficient operation of distribution networks, operators are much in need of distributed generation. This paper describes a development of the digital protection relay(HIMAP) for protecting distributed generation which is expected to play an increasing role in electric power systems in the near future. This paper particularly introduces frequency protective algorithm and reverse power protective algorithm among the relaying algorithms for protecting distributed generation in distribution networks and resents capability of a developed digital protection relay including these algorithms.

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