• Title, Summary, Keyword: Fault protection wire

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A Study on the Protection Wire Type Decision of Catenary System in the 350km/h High Speed Line (350km/h급 고속전차선로 보호선의 선종결정 기법에 관한 연구)

  • Lee, Hack-Pyo;Seo, Ki-Bum;Park, Jae-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.12
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    • pp.1818-1823
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    • 2015
  • In this paper, we analyzed the optimal configuration of protection wire that have been installed in the electric railway power supply system. Protection wires are to suppress the ground potential rise when the short circuit fault between contact wire-rail(C-F), and protect the electronics equipments(signalling and communication) that are facility the wayside. The role of protection wires must be feed back quickly the fault current to the substation when a short circuit fault occurs. In this paper, we proposed that only one line to install the protection wire. Comparing how to newly proposed and existing system, most of the performance is similar. The reason is that most of the current flowing in the protection wire near the location where the fault occurred. There is no problem even if in one line for human safe and the low impedance of the return circuit in dimension to ensure the safety of the facility during the fault. To ensure safety during an fault occurs, it is sufficient even by one line. But, In the protection wire of facilities planning it is necessary to design taking into account the potential utility.

Optimization of protection System on the Railway High Voltage power System (철도 고압배전계통의 보호시스템 최적화 방안 연구)

  • 조웅기;창상훈;한성호;김왕곤
    • Proceedings of the KSR Conference
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    • pp.989-994
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    • 2002
  • In case the fault occurs in railway high voltage power supply network, protective relaying system must selectively detect 1 wire ground fault of grounding or non-grounding system. And this study presents railway high voltage power supply system model using PSCAD/EMTDC Vet 3.08 for circuit analysis and fault studies. In this paper, we propose protection method of non-grounding system of railway high voltage power supply system. The result shows its usefulness.

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The Effectiveness due to fixed position change of fault protective wire on catenary system (전차선로에서 보호선 설치 위치변경에 따른 효과 검토)

  • Ryoo, Hyang-Bok;Ahn, Young-Hoon;Hyun, Chung-Il;Kang, Seung-Wook
    • Proceedings of the KSR Conference
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    • pp.1456-1459
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    • 2007
  • Protective equipments have a very important protection role in power accident on catenary line. These equipments are installed on electrical pole. The poles have complicated with many bands(moveable bracket, branch wire anchor, shield wire, etc). So we have improved bands and installed bands on pole to test technical condition. The Result has showed effectiveness due to fixed position change of fault protective wire and to improve band shape. For example, reduction of band made cost, simplification of installing, correct position of protective wire and shield wire.

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A Study on the Protection System for AT Feeding on the Electric Railway (전기철도 AT급전방식 보호시스템 최적구성 방안 연구)

  • 창상훈;이형수;홍재승;김정훈
    • Proceedings of the KSR Conference
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    • pp.344-351
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    • 1999
  • The safe operation of electro railways is greatly dependant on its protective systems. The system so-called Fault Protection Wire(FW) is now widely adapted to protect in AT feeding systems. It is connected between the feeder and trolley circuit to return the fault current to autotransfonmers at substation. This paper computed the distribution of fault currents at FW in the system and also evaluated the safety from electric shock when ground fault or flashover occur in the feeding system. The results show FW is useful to protect power supply network from fault in electric railways

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Analysis of Induced Voltage on Sheath of Transmission Power Cable Connected with Surge Arrester (피뢰기 적용에 따른 지중송전케이블 시스 유기전압 해석)

  • Lee, Jun-Sung;Lee, Jong-Beom;Kim, Young
    • Proceedings of the KIEE Conference
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    • pp.1391-1393
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    • 1999
  • This paper have analyzed sheath induced voltage in underground transmission cable system which will be operated with cable cover protection unit(CCPU). Simulation was carried out to analyze sheath induced voltage using on real cable system in the case with and without CCPU. Sheath induced voltage was also analyzed according to grounding method, fault resistance and fault angle. Simulation was performed using EMTP and ATP Draw, the simulation results represent whether the arrester is necessary or not in cable system.

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The Study on the Impulse Characteristic of Secondary Arresters in Power Distribution System (가공 배전선로 중성선과 가공지선 겸용시의 임펄스 특성 연구)

  • Kang, Moon-Ho;Kim, Dong-Myeong;Song, Il-Keun;Chun, Sung-Nam
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.297-299
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    • 2004
  • In multi-ground distribution system, overhead ground wire and neutral wire are parallel connected to offer the electrical power energy and protect damage of lightning strokes. Therefore a case where the two wires become single wire, the power company can get the benefit such as installation cost saving and line fault protection by simplify of distribution line. In this paper we describe the result of impulse test in both system ; one is the present power system the other is unified power system parallel connected overhead ground wire and neutral wire. As a result of this impulse test, the present power system get lower impulse voltage than the unified power system.

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Fault Location Estimation Algorithm in the Railway High Voltage Distribution Lines Using Flow Technique (반복계산법을 이용한 철도고압배전계통의 고장점표정 알고리즘)

  • Park, Kye-In;Chang, Sang-Hoon;Choi, Chang-Kyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.2
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    • pp.71-79
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    • 2008
  • High voltage distribution lines in the electric railway system placed according track with communication lines and signal equipments. Case of the over head lines is occurrence the many fault because lightning, rainstorm, damage from the sea wind and so on. According this fault caused protection device to wrong operation. One line ground fault that occurs most frequently in railway high voltage distribution lines and sort of faults is line short, three line ground breaking of a wire, and so on. For this reason we need precise maintenance for prevent of the faults. The most important is early detection and fast restoration in time of fault for a safety transit. In order to develop an advanced fault location device for 22.9[kV] distribution power network in electric railway system this paper deals with new fault locating algorithm using flow technique which enable to determine the location of the fault accurately. To demonstrate its superiorities, the case studies with the algorithm and the fault analysis using PSCAD/EMTDC (Power System Computer Aided Design/Electro Magnetic Transients DC Analysis Program) were carried out with the models of direct-grounded 22.9[kV] distribution network which is supposed to be the grounding method for electric railway system in Korea.

An Instrumentation System Design for Electrical Accident Prevention of 3-Phase Electrical Control Panel (3상 전기제어반 전기사고 예방을 위한 계측시스템 설계)

  • Kwak, D.K.;Choi, J.K.;Kim, J.J.;Kwon, Y.J.;Song, G.
    • Proceedings of the KIPE Conference
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    • pp.36-37
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    • 2016
  • The main cause of electrical fires are caused due to short circuit and open circuit. This is generates an instantaneous electric arc or spark accompanied with such electric faults. These arcs generate a pressed wire, contact badness, and a weakness in the wire coating etc.. This research proposes a protection circuit to prevent open-phase accident due to contact failure of electromagnetic contactor, tracking arc fault, open-phase within the three-phase electrical control panel which is the most commonly applied in the industry. The proposed circuit also alarms and cuts off of power system when electrical faults occurs. In addition, the proposed circuit is validated by various electric accident simulator.

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A Study on the Protection System on the Electric Railways (전철급전회로 보호시스템에 관한 연구)

  • Chang, Sang-Hoon;Lee, Chang-Moo;Han, Moon-Seob;Oh, Kwang-Hae;Shin, Han-Soon;Kim, Jung-Hoon
    • Proceedings of the KIEE Conference
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    • pp.1166-1169
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    • 1998
  • The Load characteristic of electric railway requires the power demand of the high capacity which amplitude is spacial-temporally fluctuated due to frequent starting and stopping with large tractive force. The conventional electric railway mainly consists of the resistance controlled and the thyristor controlled locomotives, are compensated for their bad characteristics of the power factor$(70\sim80%)$ with installation of another capacitor improving power factor at the substation. Since 1994, VVVF train car with good characteristics of power factor(100%) have been introduced and operated in Kwa-Chon Line. From the present technical tendency, it is judged that introduction of the locomotive with various controlled methods is necessary. The protective equipments installed at the substation are complicated and various aspects to detect faults and reduce their extension, so the universal countermeasures are required. Specially in the case of the fault occurrence it is difficult to calculate the fault location because of the change in the contactline constant according to modifying the characteristics of the contactline (the dualized catenary wire and extension, etc), so much time is required for the detection of fault location. In BT-fed method distance-relays and fault-locators are not installed, we have so many difficulties in the quick accident recovery.

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Arc Fault Circuit Interrupter Design using Microprocessor (마이크로프로세서를 이용한 아크결함 차단기 설계)

  • Yoon, Kwang-Ho;Ban, Gi-Jong;Lee, Hyo-Jik;Park, Byung-Suk;Nam, Moon-Hyon
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.44 no.1
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    • pp.12-18
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    • 2007
  • As an arc fault interrupter, the AFCI mentioned in this paper has been designed to detect and interrupt arc faults due to wire deterioration, insulation, wire damage, loose connection, and excessive mechanical damage. Since AFCI is digital and uses mechanical and electric stress, the length of interruption against overload and over-current is much shorter than the current bi-metal method. Therefore, the risk of electrical fires has been reduced.