• 제목/요약/키워드: Protection Relay

검색결과 343건 처리시간 0.027초

UPFC가 연계 된 강진-장흥 송전선로 보호용 거리계전기의 동작특성에 관한 연구 (A Study on Operation Zone of Adaptive Distance Relay on Transmission Line Connected UPFC Between Kangjin and Jangheung)

  • 이승혁;정창호;김진오;정현수
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2003년도 하계학술대회 논문집 A
    • /
    • pp.305-307
    • /
    • 2003
  • This paper presents an apparent impedance calculation procedure for distance relaying of transmission line involving FACTS (Flexible AC Transmission System) devices, particularly the UPFC (Unified Power Flow Controller), between Kangjin and Jangheung in Korea. With the changes of UPFC's parameters, the measurement and protective range (trip boundaries) of the adaptive distance relay can also be changed. So, it is the most important part in the field of system protection to analyze the operating characteristic of relaying system. The presence of UPFC significantly affects the trip boundaries which are also adversely affected by fault resistance combined with remote end infeed. This paper presents the apparent impedance calculations and the distance relay setting characteristics for faults involving the UPFC in the KEPCO system.

  • PDF

DSP의 DMA 제어기를 이용한 변압기용 디지털 보호계전기의 성능향상 (Efficiency Improvement of Digital Protective Relay for Power Transformer Using DMA Controller of DSP)

  • 권기백;서희석;신명철
    • 대한전기학회논문지:전력기술부문A
    • /
    • 제52권11호
    • /
    • pp.647-654
    • /
    • 2003
  • As electrical power system has become complicated and enlarged to cope with the increasing electric demand, it has to be expected that higher speed, higher reliability, higher function and higher arithmetic ability in protective relay should be realized. Therefore, in this papers, by hardware design and implementation used DMA controller that transfer blocks of data to any location in the memory map without interfering with CPU operation, CPU utilization is increased effectively, as a result it made possible to implement multi-function digital protective relay which has high trust and high function of protection as well as control and metering for power transformers using single processor(DSP).

웨이블렛 변환을 이용한 변압기 보호계전 알고리즘 (Protective Relaying Algorithm for Transformer Using Wavelet Transform)

  • 홍동석;이종범
    • 대한전기학회논문지:전력기술부문A
    • /
    • 제52권2호
    • /
    • pp.134-141
    • /
    • 2003
  • The power transformer is one of the very important electric facilities in power systems. Recently, current differential relay is widely used to protect such power transformer But if inrush occurs in transformer, relay can be tripped by judging like internal fault. Therefore the correct discrimination between internal winding fault, inrush and overexcitation should be performed. This paper presents a new protective relaying algorithm which discriminates inrush, internal faults and overexcitation of transformer modelled using BCTRAN and HYSDAT of EMTP. Discrimination between internal winding fault and inrush is revealed in simulation within 1/2 cycle after fault. Accordingly, it is evaluated that the proposed algorithm has better discrimination characteristics in various cases thin the current relaying for protection of transformer.

Adaptive보호범위를 가진 송전선로 보호용 디지털 거리계전기 (Digital Distance Relay with Adaptive Protection Zone)

  • 정창호;이재규;정병태;안복신
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1998년도 하계학술대회 논문집 C
    • /
    • pp.893-895
    • /
    • 1998
  • This paper presents the adaptive setting method of distance relay under the single line ground fault. The apparent impedance measured at the relaying point and actual impedance is different because of fault resistance and various prefault loading condition. For a resistance earth fault detection, relay setting zone is adaptively changed with measured load current and bus voltage at the relaying point to avoid maloperation.

  • PDF

PROSET2000 : 송전계통 보호 전산종합 프로그램 개발 (PROSET2000 : An Integrated Computer Program for Power Transmission System Protection)

  • 김영일;이승재;최면송;강상희;김호표;이운희;최홍석
    • 대한전기학회논문지:전력기술부문A
    • /
    • 제48권5호
    • /
    • pp.538-544
    • /
    • 1999
  • One of the most important requirements for the development of computerized relay setting system is its openness to abbommodate the various changes like new panel additions. This paper describes the relay settein-coordination system(PROSET2000), which has an open system architecture and adopts the dbject oriented programming paradigm. Its main features include the intelligent fault type identification, automatic running of the short circuit analysis, ren-time rulebase modification, automatic documentation, ect.

  • PDF

전압, 전류 변화 추이를 이용한 전력용 변압기 보호계전 알고리즘 (A New Protective Relaying Algorithm for Power Transformer Based on Three Phase Voltage and Current)

  • 김상태;이승재;강상희;진보건;윤상현;이태성
    • 대한전기학회논문지:전력기술부문A
    • /
    • 제50권4호
    • /
    • pp.157-165
    • /
    • 2001
  • The two criteria to identify the disturbances of the power transformer has been reported in this paper. They have been derived through EMTP simulations of internal faults, inrush and overexcitation for the model of 154/22.9[kV], 40[MVA], Y-Y three-phase power transformer. We propose the crisp algorithm which uses two criteria. A series of test results clearly indicate that the method can identify not only an internal fault but also the other transients. The average of relay operation times is about 7.2[ms]. The proposed algorithm immunes to the transient state.

  • PDF

Analysis on the Protective Coordination with the Superconducting Fault Current Limiter for the Application into the KEPCO Grid

  • Kim, Jin-Seok;Kim, Jae-Chul;Lim, Sung-Hun
    • 조명전기설비학회논문지
    • /
    • 제25권3호
    • /
    • pp.33-39
    • /
    • 2011
  • In this paper, the protection coordination of the protection devices such as the over-current relay (OCR) and recloser (R/C) with superconducting fault current limiter (SFCL) was investigated in a KEPCO grid. The operation time and protection coordination of the protection devices were changed by the SFCL. Through the analysis for protection coordination between the SFCL and the protection devices in the KEPCO grid, the operation time was observed to depend on the impedance of the SFCL.

영상 전류를 이용한 변류기 개방 판단 알고리즘 (Algorithm for detecting the failure of a current transformer using the zero-sequence current)

  • 강용철;이병은;이현웅;김유다;박준수;이미선;박지연;이보은
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
    • /
    • pp.163-164
    • /
    • 2006
  • A current differential relay has been used for transmission line protection. The relay may maloperate in the case of a failure of the secondary circuit of a current transformer (CT) because the differential current is produced. This paper presents an algorithm to detect a failure of a CT using the zero-sequence current. If the magnitude of the zero-sequence current is the same as the magnitude of the current of the other healthy phases, a failure of a CT is detected and then the blocking signal is activated. The proposed algorithm prohibit the maloperation of a differential relay in the case of a CT failure and thus increase the security of the relay.

  • PDF

분산전원의 Fault Ride Through를 고려한 방향성 과전류 계전기 최적 정정법에 관한 연구 (A Study on the Optimal Setting Method of Directional Overcurrent Relay Considering Fault Ride Through of Distributed Generation)

  • 송진솔;조규정;김지수;신재윤;김동현;김철환
    • 전기학회논문지
    • /
    • 제67권8호
    • /
    • pp.1002-1008
    • /
    • 2018
  • Fault Ride Through(FRT) requirement prevents disconnections of distributed generations during the specific time on disturbance condition for system stability. However, since there is a limitation to the FRT capability of distributed generation, and the protection system needs to clear the fault quickly before the distributed generation is disconnected. Therefore, this paper proposes a novel optimal setting method of directional overcurrent relay considering FRT of distributed generation. The proposed method reduces the probability of disconnections of the distributed generation in disturbance without additional equipment considering the FRT capability of the distributed generation by calculating the optimal relay setting through the Genetic Algorithm(GA).

임베디드 프로세서를 이용한 계통 보호 IED 설계 (Power system protection IED design using an embedded processor)

  • 윤기돈;손영익;김갑일
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
    • /
    • pp.711-713
    • /
    • 2004
  • In the past time, the protection relay did only a protection function. Currently, its upgraded device i.e. IED(Intelligent Electric Device) has been designed to protect, control, and monitor the whole power system automatically. Also the device is desired to successfully measure important elements of the power system. This paper considers design method of a digital protection IED with a function of measuring various elements and a communication function. The protection IED is composed of the specific function modules that are signal process module, communication module, input/output module and main control module. A signal process module use a DSP processor for analysis of input signal. Main control module use a embedded processor, Xscale, that has an ARM Core. The communication protocol uses IEC61850 protocol that becomes standard in the future. The protection IED is able to process mass information with high-performance processor. As each function module is designed individually, the reliability of the device can be enhanced.

  • PDF