http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
도시철도 통합접지망에서의 위험전압에 따른 연접접지봉의 최적 분기간격에 관한 연구
정호성(Hosung Jung),박영(Young Park),김형철(Hyengchul Kim),김진희(Jinhee Kim),김재문(Jaemoon Kim),조대훈(Daehoon Cho) 대한전기학회 2012 전기학회논문지 Vol.61 No.9
Urban rail transit tends to global grounding system in order to control ground potential rise and potential differences between electric equipments. In addition, global grounding system can discharge the large capacity surge current to the ground safely. Since some railway electric equipments are installed all section of line, the global grounding system connected with the connecting grounding wire is more effectively. However, if the fault occurred in the connecting grounding wire area, some dangerous voltage is generated. So, the installation of additional grounding rod will be required. In this study, the global grounding system is simulated using CDEGS program to analyze the divergence spacing of additional ground rod depending on dangerous electric potential characteristics. Grounding net of the each station is modelled in depending on the size of the platform, and the spacing of the connecting grounding rod are compared 50m, 100m, 250m and 400m. Simulation results considering of earth resistivity and underground condition of the connecting grounding wire, spacing of the connecting grounding rod is that less than 250m to spacing of the ground rod was appropriately confirmed.
직류급전시스템에서의 귀환전류 변화비를 이용한 표유전류 실시간 감시기법에 관한 연구
정호성(Hosung Jung),박영(Young Park),김형철(Hyengchul Kim),민명환(Myung-Hwan Min),신명철(Myong-Chul Shin) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
In DC electric railways, while an electric rail car is driving, a part of the working current returned to the substation through rails leaks into the ground. Such a stray current causes railway facilities and metal objects to corrode electrolytically. Therefore, change of stray current needs to be monitored constantly. But so far in domestic, the research on stray current measuring techniques and system adaption are insufficient. To estimate stray current, this paper addresses a method of monitoring the return current that is returned into the negative pole of the substation in real time.
차량기지의 전압불평형 감소를 위한 급전변압기 결선방식 해석
정호성(Hosung Jung),한문섭(Moonseob Han),박영(Young Park),김형철(Hyengchul Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
철도급전계통에서는 전원측의 전압불평형을 줄이기 위해 스코트 변압기를 운영하고 있다. 본 논문에서는 차량기지에서 전압불평형을 감소시키기 위한 스코트변압기의 부하 분배, 부등변 스코트 변압기 결선에 대해 시뮬레이션을 수행하였다. 이를 통해 부하분배량이나 보상설비에 따른 전원측의 전압불평형율을 예측할 수 있었다.
직류급전계통에서의 레일전위 상승 분석 및 억제 방안 연구
민명환(Myung-Hwan Min),정호성(Hosung Jung),박영(Young Park),김형철(Hyengchul Kim),신명철(Myong-Chul Shin) 대한전기학회 2011 전기학회논문지 Vol.60 No.3
Nowadays, in metropolitan railroad, DC feeding system is being generally applied. In order to reduce damages of electro-chemical corrosion caused by stray current and leakage current, in DC feeding system, rail is used as negative-polarity return conductor for traction load current. However, it has problem of rail potential increase and there are no adequate measures to prevent it in domestic. In this paper, we presented fundamental theory and related standards about rail potential increase. And then, we analyzed field testing data and simulated a variety of operations by using PSCAD/EMTDC as an analysis program of power system. In addition, voltage control device is suggested to prevent accidents caused by rail potential increase.
직류전기철도에서의 실시간 누설전류 계측기법에 관한 조사분석
정호성(Hosung Jung),한문섭(Moonseob Han),박영(Young Park),김형철(Hyengchul Kim),김진호(Jinho Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
This paper presents the real time stray current monitoring techniques on the DC railway system. These techniques are two types. The first one is the rail potential measurement technique between running rail and earthing mats on the important locations such as substation, station, and so on. And the second one is measurement technique of stray current through substation earthing mats and from collection mats, and continuous monitoring of return currents through the running rails. We need to apply these techniques on DC railway system to monitor stray current periodically and maintain the system properly.