계통변화를 고려한 자율 적응형 과전류 계전기

尹晙碩,崔勉松,李承宰,玄升鎬 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In this paper present Autonomous Adaptive Digital Over Current Relay for distribution networks which acts autonomous setting using the short circuit impedance measured by relay of power systems. Automation of relay setting is one of the basic requirements for distribution automation, although manual relay setting is used at present. The short circuit impedance from a power source in distribution networks essential for the Autonomous Relay Setting changes frequently in distribution networks. In this paper the short circuit impedance is calculated with voltage and current measured in real time operation of digital relay using the Recursive Least Squares. A new method of digital relay setting in introduced using the the short circuit impedance and load current.

보호계전기 정정을 위한 Open Interface 개념의 사용자 환경 설계

吳成民,崔勉松,李承宰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

KEPCO is using power system protection business developing PROSET2000 to computerize synthesis. This system is database and synthesis computing program that have correction automation program etc., for protective relaying business. PROSET2000's Human Machine Interface(HMT) that is designed by GOMS could not reflect justly user's requirement. Studied new design method of HMI for fast penumbra of user's requirement. Apply and designs Open Interface technique in view of software methodology to solve problem of performance of existent PROSET2000 system. System developer can receive optimum service by offering interface(Meta Interface) that user can exhibit on outside, and change achievement strategy etc., that must select according to circumstance among embodiment contents in case apply Open Interface technique. Could reflect requirement of PROSET2000 development time shortening and user fast by developing HMI to Open Interface concept. Can improve PROSET2000 performance by selecting Open Interface concept.

UML을 이용한 송전선로 보호계전기 정정프로그램 분석/설계

吳泰旭,崔勉松,李承宰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

PROSET2000 that is integrated protective management system had developed and used in order to automate the setting process of protective relays in transmission system protection. PROSET2000 have database for relay setting and automated for relay setting program within. This paper proposed PCM current differential relay setting program point of Object Oriented Programming paradigm using Unified Modeling Language about additional relay in PROSET2000. Nevertheless each relay uses same current differential but setting method is different. This paper discribed different thing about setting method of each relay and evaluated more effective and corrective relay setting program using UML.

Multi-Agent System을 이용한 배전계통 자율 적응 최적 보호 시스템

鄭廣鎬,崔勉松,李承宰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

The topology of the power distribution network with protection scheme using over current relay is changed frequently because of load change, maintenance, mending and so on, but the setting values of protective devices are maximum values to ignore load and topology changes of the distribution network. Therefore the protection system can't isolate the light fault from distribution system. Currently, multi-agent system is focused one's attention on the world. And also the protective device is made by digital component and it has communication ability through the influence of communication technology. Because of these reasons, "an adaptive optimal protection of a distribution system network using multi-agent system" is proposed to apply multi agent system for automatic operation of protective system in this paper. The characteristic of multi-agent system has autonomy that is self-start ability and intelligence, with own knowledge, reasoning and judging ability. The agent works together to achieve a global goal, in which case each agent does the given job only. A protective agent of the proposed system has two autonomous functions with basic the protective function. One is the detecting function of network change. The other is the resetting function for optimal protection of a distribution system by coordinating with neighbor agents. When the fault is detected on network, agents isolate fault from network, then it sets parameters to new operation conditions by collaborating with other device agents. This system has adaptive protection with optimization "Protectability" applying protection. It is the "Protectability" concept for evaluation of protection system to describe how the system is well protection by an index numerical value. This system can operate optimal protection, because it detects adequate parameter by optimal method based on collaboration with neighbor agent. The purpose of proposed paper is development of system which has automatic detection of network change and rapidly automatic adaptation against network change with optimal method to set adequate parameter for complete protection.

전력계통 송배전선로 2회선 1선지락사고 고장거리 검출 알고리즘

이한웅,최면송,이승재,강상희 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - This paper presents a fault location algorithm when there are parallel circuits in power system networks. In transmission networks, a fault location method using the distribution factor of fault currents is introduced and in distribution networks a method using direct 3-phase circuit analysis is developed, because the distribution networks are unbalanced. The effect of parallel circuits in fault location is studied in this paper. The effect is important for the range of protecting zones of distance relay in transmission networks and fault location in distribution networks. The result of developed fault location algorithm shows high accuracy in the simulation that using the EMTP.

병행 2회선 송전선로 고장점 표정 알고리즘

안용진,강상희,최면송,이승재 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 describes a fault location algorithms that achieve a high accuracy almost not influenced by the variations of the source impedance, load current and fault impedance. The proposed algorithms use post-fault voltage and current taken at only one-terminal and does not require the zero sequence current of the adjacent parallel line. The fault location algorithms have been developed through the following steps: establishing two KVL equations around the parallel line loops, the distribution factors for positive sequence and zero sequence current components are obtained. They are utilized for estimating the fault current and zero sequence current of the adjacent parallel line. Applying these to the voltage equation at the measuring point (or relaying point) and separating the real and imaginary parts, the fault resistance can be eliminated and final equation which is a function of only a fault location variable can be obtained.

분포정수 회로해석과 고장 조건을 이용한 지중 케이블 시스템 고장점 표정 알고리즘

李德洙,楊霞,崔勉松 明知大學校 産業技術硏究所 2005 産業技術硏究所論文集 Vol.24 No.-

본 논문은 분포정수회로 해석 방법에 기초한 새로운 지중 케이블 고장점 표정 알고리즘을 제안한다. 제안한 방법은 장거리 가공선로 해석에 적용되는 분포정수회로 해석 방법인 쌍곡선 함수 해석 방법을 케이블 시스템에 응용하여 코어와 시스에 관한 전압, 전류 방정식을 세우고, 각 고장에 대한 전체 회로를 분석하여 각 고장조건을 만들고 그것을 이용하여 고장거리에 관한 방정식을 수립한다. 마지막으로 저력계통 과도현상 해석 프로그램으로부터 측정한 케이블의 전압, 전류 데이터를 입력하고, 뉴튼-랩슨 반복법을 이용하여 고장거리를 추정한다. PSCAD/EMTDC를 이용하여 케이블의 다양한 고장을 모의하였으며, 제안한 알고리즘을 검증하였다.

송전선로 보호계전기 정정값 진단 시스템

이승재,김국진,최면송,강상희 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.-

In the point of view a 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 occur. 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.

차세대 IBS의 전기 및 기계설비에 관한 연구

陳保建,李康奭,崔勉松 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-

This paper presents a method, which raises the efficiency of the next-generation intelligence management system using web, and a scheme for the development of central intensive detection and control system. The possibility of the control of the power devices has been verified in case study.

1회선 분기점을 갖는 병행 2회선 송전선로의 고장점 표정 알고리즘

강상희,권태원,최면송,이승재 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 presents a fault location algorithm of a single phase-to-ground fault on a parallel transmission line which contains a teed circuit. The method uses only the local end voltage and current signals. Zero sequence currents of other lines are calculated by distribution factors. Instead of zero sequence current, negative sequence current is used to remove the effect to load current and to calculate the voltage of a fault resistance. There are two distance equations in this algorithm. One of them is to calculate inner part fault location of the tap distance and the other equation is for outer part fault location of the tap distance, Correct fault distance is selected by the condition of each solution. Extensive simulation studies using EMTP have verified that the proposed algorithm can calculate an accurate fault distance in spite of effects of various error sources.