• Title/Summary/Keyword: Protective Relay

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A Study On the Improvement Of Proset2000 by a Design Method Using the Uinfied Modelling Language (UML을 사용한 디자인 방법에 의한 계통보호 종합전산 프로그램의 개선에 관한 연구)

  • 최면송;현승호;오성민;오태욱
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.1
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    • pp.7-12
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    • 2004
  • The role of protective relay with correct setting value is very important for the reliable operation of power : system. The setting process of a protective relay is difficult and requires hard work of calculations. Therefore, KEPCO as been using PROSET2000, a computer program system, in order to automate the setting process of protective relays in power transmission network since 2000. This system has a database and relay setting modules for each type of realy with coresponding Human and Computer Interaction(HCI). For the setting of a new type of relay, it require a new module, a HCI and a database table corresponding to the new relay. But it's update is not easy in case of new type of relay. This paper discussed the update method introducing a concept of Open Interface. It addressd a method to make a new HCI for new relay in view of object-oriented method using UML(Unified Modeling Language). Using the UML, we updated the PROSET2000. HCI screens for a new relay is generated automatically using the information of the new relay stored in the database. And, the database management module is upgraded to solve problems in manage and maintain the database in view of Open Interface.

Development of Web-based Protection Relay Setting Program in Power System (전력시스템 보호를 위한 웹기반 계전기 정정 프로그램 개발)

  • Bok, Jeong-Song;Jeong, Ho-Sung;Shin, Myong-Chul;Cho, In-Suk;Seo, Hee-Seok
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.246-248
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    • 2001
  • For protection of power system, it is a prerequisite to action characteristics of protective relay about a changing environment in power system and correcting the setting value. A substation operator always reside to correct of a relay, however there are problem of efficiency. Recently, power system operation become manless and supervision and control of incident is required anywhere, introduction of new concept as a intellectual manless protective relay is a recent trend. This paper is the web-based protective relay setting program that a manager make an analysis of operation and incident of power system through the web at a remote place corresponding recent manless of system and approach the protection relay and then can correct the error.

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Dynamic Performance Test of Power Transformer Protective Relay using 345kV Transformer Modelling of PSCAD/RTDS (PSCAD/RTDS에서 345kV 변압기 모델링을 통한 변압기용 보호계전기의 동특성 시험)

  • Kwon, Gi-Baek;Kim, Cjul-Hwan
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.120-123
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    • 2005
  • This paper, for the establishment of power system models and test procedures for the dynamic performance test of transformer protective relay, presents power system model, environment establishement between RTDS and protective relay, and the dynamic performance test generated internal fault or external fault.

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Graphical Presentation on Operation Principle of Protective Relay According to Winding Type and Vector Group in Transformer (전력용 변압기에서 권선방식과 벡터그룹에 따른 보호계전기 동작원리의 그래픽 표현)

  • Lee, Jong-Beom
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1410-1412
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    • 1999
  • Protective relay for transformer operates in general by comparing with the differential current and the restraint current. These kinds of currents are changed on magnitude and phasor during the fault according to winding type and vector group. This paper presents the differential and restraint currents and operational principle of differential protective relay for two-winding and three-winding transformer with graphical model. It is developed using MATLAB for an educational purpose on engineer related in power system and protection in university and power utility including large factory.

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The Development of an Algorithm for the Correction of Errors in the Phase Current of the Protective Relay on Distribution System Interconnected with Distributed Generations (분산전원 연계선로에서 보호계전기의 상전류 오차보정 알고리즘 개발)

  • Shin, Dong-Yeol;Yun, Donghyun;Cha, HanJu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.11
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    • pp.1604-1609
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    • 2013
  • When the ground fault on the power side occurs on distribution system interconnected with distributed generations, the abnormal current is generated in the neutral conductor by the connection type and the iron core structure of transformers for the interconnection of distributed power supplies due to the unbalanced voltage of the system, and subsequently the false operation of the protective relay on the load side occurs. Herein, this paper proposes the method to correct errors in the phase current to prevent the false operation of the protective relay by applying p-q theory and presents the simulation result of the error correction algorithm using PSCAD/EMTDC.

A Design of Power Management and Control Systems Using Digital Protective Relays (디지털보호계전기를 활용한 전력감시제어시스템 설계)

  • Lee, Sung-Hwan;Ahn, Ihn-Seok
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.191-193
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    • 2000
  • In this paper, being different from traditional methods, we design digital protective relay which can be applied to power management and control systems of not only small and medium but also a large scale plants. The digital protective relay was designed with DSP CPU(TMS320C31) to protect and measure more quickly and precisely. We will present test result which it performed according to the standards of Korea Electrical Manufactures Cooperative to prove the faculties of digital protective relay. The test result on the basis of KEMC1120 and IEC60255, show that the operation time error of the digital motor protection relay is improved within ${\pm}5%$.

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Design of digital relay controller on a single chip (디지털 보호 계전기 전용 제어 칩 설계)

  • Seo, Jong-Wan;Jung, Ho-Sung;Kweon, Gi-Beak;Suh, Hui-Suk;Shin, Myong-Chul
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.215-217
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    • 2000
  • Protective relay play a crucial role in the proper operation of a power system, and the reliable transfer of electrical power. This paper deals with the design and implementation of a digital protective relay on a single chip. Implementation on the FPGA(Field Programmable Gate Array) of the chip of digital protective relay. This protective relaying chip monitors the frequency and the voltage and current of the power system. And report the voltage, the current. the frequency, active power and reactive power.

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A Study of the Development of Power System Model for Performance Test of Transmission Line Protective Relay (송전선로 보호용 보호계전기 시험을 위한 계통모델 개발에 관한 연구)

  • Seo H. C.;Lee H. H.;Kim C. H.;Lee J. W.;Jang B. T.;Gwak N. H.;Kim H. P.;Kim l. D.
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.430-432
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    • 2004
  • The standard power system model is needed to test a transmission line protective relay There are two methods to develop a power system model for transmission line protection. First method is based on characteristic power system model, and second method is based on functional power system model. This paper presents a standard power system model for performance test of transmission line protective relay, where the power system model is based on the two methods. And this model is simulated by using RTDS to test a protective relay.

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A Development of Diagnosis Expert System for Power System Protective Relay Settings (보호계전기 정정값 진단 전문가 시스템 개발)

  • Kim, K.J.;Lee, S.J.;Choi, M.S.;Kang, S.H.;Kim, H.P.;Lee, W.H.;Choi, H.S.
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1394-1396
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    • 1999
  • It is important the protective relay should have high selectivity and sensitivity performance and it is achieved by correct setting of the relay parametes. The verification of accurate setting for the protective relay is very difficult before a actual fault occurs. This paper reports a diagnosis expert system to verify the correctness of the relay setting by using the operation results in the power system fault simulation.

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A Development of Protective Relay Operating-Diagnosis System for Power System (송전계통 선로보호 계전기 동작 진단 시스템)

  • Kim, K.J.;Lee, S.J.;Choi, M.S.;Kang, S.H.;Kim, H.P.;Lee, W.H.;Choi, H.S.
    • Proceedings of the KIEE Conference
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    • 1999.11b
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    • pp.107-109
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    • 1999
  • In the point of view protective relay, the selectivity and sensitivity is very important in its performance. The correct setting of the relay parameter is required. The verification of accurate setting for the protective relay is very difficult before a actual fault occurs. In this paper, we proposed the diagnosis expert system as a method to verify the correctness of the relay setting. The developed system proved effectiveness through the tests on the real systems.

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