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765kV 송전계통 보호계전기의 오차분석을 통한 정정지침에 관한 연구
최면송,이승재,강상희,조성진,배영준,조범섭,유영식 대한전기학회 2003 전기학회논문지A Vol.52 No.1
- In this paper, the protective relay setting rules of Korean electric power system are studied by analysis of errors to be considered. An accurate operation of protective relays with accurate settings are important in power system reliability. The setting rules are used from the first establishment in 1982 and revision in 1990 Therefore, it needs revise and analysis of the setting rules because of environmental changes such as voltage raise or applied new technology of power system. Two major setting rules are studied. One is the rule for Zones of distance relay for transmission lines. The other is the one of differential current in a differential relay for power transformers. The range of errors in the setting rules accepted in the field experience is studied in simulation of case study. Also some guide lines for the range of errors in the setting rules are presented from the case study using Matlab simulation.
ULTC 탭차에 의한 765kV용 변압기 탱크간 순환전류 해석에 의한 보호계전기 정정지침에 관한 연구
최면송,배령준 대한전기학회 2004 전기학회논문지A Vol.53 No.4
The 765[kV] transformer is operated using two parallel tanks because of its high capacity. The protective relay (61) for the current phase balance of a 765[kV] transformer would misoperate by excessively, circulation current of each tanks caused by a mismatch of ULTC Tap. In this paper, the phenomenon was analyzed, and the setting rules of relay for bank protection are studied. The result of analysis is verified by the simulation of 765[kV] transformer with the Power Systems Computer Aided Design(PSCAD). Thereby an appropriate setting rule of the current phase balance relay is recommended.
송전계통에서의 방향지락과 전류계전기와 거리계전기의 보호협조 해석
이승재,김홍석,강상희,최면송 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
This paper proposes a system which checks the coordination between DOCGR for the transformer protection and the distance relay for the line protection in case of a ground fault and optimizes their operation. The graphical user interface provides the easy and convenient.
편리한 사용자 환경을 가진 객체 지향적 보호 계전기 정정시스템
김희철,이승재,김영일,최면송 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
In this study, a development of the computerized relay setting system is reported, which adopting the object-oriented programming methodology. It has a pull-down menu driven and graphics-based user interface environment and reporting capability, which achieves the time saving and accuracy, contributing to the enhancement of relay engineers' productivity and system security. The developed system can handle the two types - current differential and directional comparison protection scheme - of the relay panels. It has received a very good response from the relay engineers in the field.