• The Transactions of the Korean Institute of Power Electronics
• /
• v.9 no.5
• /
• pp.498-506
• /
• 2004

The protection algorithm of DC line grounding for the subway is proposed in this paper. Compared to the conventional protection algorithm, the proposed algorithm has a advantage that can distinguish the difference between service line and faulted line. The contents of the proposed algorithm are by using blocking filter and PLC(Power Line Carrier). Results of the simulation show that the proposed algorithm is very useful.

• Proceedings of the KIEE Conference
• /
• 2005.10c
• /
• pp.261-263
• /
• 2005

본 연구는 지하철 역사 내에서 일어나는 사고를 예방하기 위한 역사 내 안전사고 유형 분석을 실시하였다. 지하철 역사 내에 일어나는 사고에 대한 조사를 통해 역사 내 안전사고 유형을 파악하여 안전사고 예방시스템 구현에 활용하고자 한다. 역사 내 사고 유형 분석을 통해 이용승객의 안전성 확보와 승강장 선로에 물건이나 사람이 떨어진 경우 혹은 화재 등의 비상상황발생시 안전시스템을 통해 컴퓨터가 신속히 검지하여 차량과 종합사령실에 알려 차량의 진입을 막아 사전에 피해를 줄이는데 활용할 것이다. 따라서 본 연구를 통해 위급상황에 대한 안전시스템 구성에 도움을 줌으로써 사회적으로 귀중한 생명을 보호하며, 경제적으로는 안전사고 발생에 따른 처리 비용과 안전사고에 따른 지하철 운행지연. 운행 중지 등으로 인한 경제적 비용을 절감할 수 있다.

• Proceedings of the KSR Conference
• /
• 2008.06a
• /
• pp.451-465
• /
• 2008

The DC over current relay(76i) and the DC under voltage relay(mid-point relay, 80A) used mainly with DC protective relay system of DC electric railway in Korea, But the DC fault selective relay(50F) is applying to recently mainly. In this study, simulation to compare 76i/80A and 50F in the methods of protection and the operational characteristics were executed through verifying a calculation of short circuit current and using PSCAD/EMTDC transition program. As a result of this study, it was proved that while 80A runs in relation to the scale of fault resistance, 50F runs regardless of the scale of fault resistance or the length of rail.

• Proceedings of the KSR Conference
• /
• 2008.06a
• /
• pp.433-444
• /
• 2008

Nowadays, subway station has provided not only transportation but living spaces for everyday activities. Therefore, a variety of facilities have been installed for a safety of citizens such as fire-fighting equipment, platform screen doors and giving high level of benefits such as air-conditioning and heating equipment, escalators, lighting apparatus. In order to operate these facilities appropriately, it is needless to say that electric power supply must be reliable. Many protection relays have been installed to protect electric apparatus and power system, nevertheless it..s study has been insufficient in the concrete. From this paper, through analyzing of protection relay system of electric room operated in line 2 of Seoul metro, we can help to improve stable power supply system of subway station.