전기철도용 과전류 계전기 최적화 연구

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According to electrification of railroad in domestic and gradually increasing dependency for using electric power in operating the system, the demands that are suppling stable power in the electric railway and power quality improvement increase rapidly. Also importance of protective relay which is main part for maintain the stability in the grid increases steadily. Protective relay can clearly detect the type of the fault like electric tramway fault or transformer fault, amplitude of the fault voltage and current, the impedance. It can control the shut down system in the grid for prevent the expansion of the fault state and also find the faulting spot. The causes of the fault in the AC electric railroad system are short circuit in the substation or
the feeding circuit and line to ground fault. The fault occurs the high voltage and the large current, it should be remove in a moment. Therefore by replacing the protective relay in perfect location can detect the fault and organize circuit with protection in electric tramway system. Recently there are no big difference between the fault current and load current because of the high speed technology and using regenerative electric tram. Thus protective system is essential to avoid malfunction by protective relay. Domestic electric tram has distinctive electric uniqueness. Various of relay which developed in internal and external are widely used for construct the reliable gird. When there is a fault or the overload in the grid, it causes the large current than steady state current. The over current relay detects the current which high rated and sends the block signal. It removes the fault and overloaded states by relatively simple mechanism so it is prevalent in electric tramway system.
In this paper, decide the suitability of over current relay in protective device coordination to suggest the proper value by running the real simulation of 3 substation in Ho-nam. Also calculate the value of over current relay in the changed power feeding system by applying high speed tram. Finally verify the reliability by applying in the real grid.
Alternative Title
A Study on Optimization of Over-Current Relay for Electric Railway
Alternative Author(s)
Ji-Myoung Shim
조선대학교 산업융합기술대학원
산업기술융합대학원 전기기술융합공학과
Awarded Date
2017. 2
Table Of Contents

Ⅰ 서 론 1

Ⅱ 이론적 고찰 3
A. 고장 전류 3
1. 고장전류의 형태 3
2. 고장전류 공급원 4
3. 비대칭 계수 5
B. 과전류 계전기 6
1. 전기철도용 과전류 계전기 6
2. 디지털 보호계전기 8
3. 전기철도용 과전류 보호계전기 8

Ⅲ 실험 및 결과고찰 10
A. 호남선 전철변전소 과전류 계전기 10
B. 호남선 전철변전소 과전류 계전기 18
1. 노안전철변전소 과전류 계전기 정정 19
2. 일로전철변전소 과전류 보호 계전기 정정 27
C. 분석결과 30

Ⅳ 결론 34
조선대학교 산업융합기술대학원
심지명. (2016). 전기철도용 과전류 계전기 최적화 연구
Appears in Collections:
Engineering > Theses(Master)(산업기술창업대학원)
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