• 한국정보통신학회논문지
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• 제21권8호
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• pp.1597-1603
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• 2017

지하공동구의 화재 발생 빈도는 다른 화재에 비하여 낮은 편이나 화재로 인한 피해는 경제적 손실 뿐만 아니라 사회운영 마비로 사회적 손실을 초래할 수 있다. 이에 본 논문은 지하공동구 내 설치된 누설 동축케이블을 이용하여 지하공동구의 상태감시시스템 구축에 대한 실증 시험 결과를 제시한다. 이를 위해 지하공동구에 설치된 누설 동축케이블에 삽입손실 특성이 $-6{\pm}2dB$인 유도성 커플러와 200 Mbps급 전력선 통신 모뎀을 연결하여 실증 시험한 결과, 500 m까지 IP 카메라의 송/수신을 확인하였다. 따라서 데이터 전송을 위한 통신선로의 추가 설치 없이도 지하공동구 내 설치된 누설 동축케이블을 이용하여 지하공동구에 상태감시시스템 구축이 가능할 것으로 판단된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.578-579
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• 2011

This paper describes the analysis of induced lightning surge phenomena at underground power cables under construction when the lightning surge strikes at phase conductor of grounding wire of overhead line in service. Therefore, This paper proposes the optimal protection methods establishment against lightning surge induced from operating transmission.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.380-382
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• 2001

This paper describes the protection of insulation joint box in combined transmission line which is connected with the 154kV underground power cables. An actual power cable system was selected to establish modeling and to analyze. Modeling was established in EMTP and ATPDraw. Simulation was carried out according to the buried method of cable and connection method of CCPU. Results presented in this paper will be applied to another power cable systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1646-1648
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• 1994

In the system of underground transmission line, the rate of electrical failure is very low, but, if once occuring, the failure evolves into a paralysis of the system, the time of restoration is very long, the damage from stopping of power supply is very serious, and the cost of restoration is very great. Because of these problems, you must try to protect the system and equipment from every electrical failure by contributing much carefulness to the design and operation of the underground system. This study summerizes the results of simmulation tests about the effect of installing this protection device on the insulated joint box and the terminal end box.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1966-1968
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• 2000

Globally, oil-filled paper-insulated cables and cross-linked polyethylene-insulated cables have been mainly applied for a underground power transmission line. The oil-filled cable has the hydraulic system in which insulating oil, expanded and contracted by temperature changes, is absorbed and supplied. This system enable us to detect oil leakages from the cable. But it has some problems such as difficulty in detecting minor leakages and a relatively long period of fault detecting. And so, this paper introduce a new leakage detection system, improved from the current one.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.248-248
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• 2007

Demands for electricity are growing, whereas the rate of electricity infrastructure's construction declines gradually. To keep the balance of the demand and supply, the share of underground transmission line will be increased from 8.3% to 10.5% in 2020 but it will be accompanied with enormous public expenses. A great concern in high capacity transmission is on the increase so as to maximize the spacial efficiency. High Temperature Superconducting (HTS) cable is in the lime light which has the merits of environment-friendly, low transmission loss and high transmission with low voltage, but the reliability verification as a power system is yet to be solved. KEPCO completed the installation and acceptance of $3{\phi}$, 22.9kV, 1250A class HTS cable system in 2006 and the long term test is in progress. The test results focusing on long term reliability are presented in this paper.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 춘계학술대회 논문집
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• pp.35-40
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• 1997

As demand of electric power are growing and transmission line limited owing to enlargement of the downtown area The eonfidence of underground transmission cable which shows gradual growth are high. It is found whether insulating ability is good or not. In this paper, The exper iment result is shown that the fall of insulating ability and take preventive measure through the analysis of tans, water content, dielectric breakdown voltage, total acid number, volume resistivity , and gas in the oil in an accordance with the characteristic change of oil used very much for insulating oil of cable.

• 한국초전도ㆍ저온공학회논문지
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• 제5권2호
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• pp.20-29
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• 2003

As power systems grow more complex and power demands increase, the need of underground transmission system is increasing gradually. But it is very difficult and high in cost to construct new ducts and/or tunnels for power cables in metropolitan areas. HTS (High Temperature Superconducting) cable can carry very high current densities with strongly reduced conductor loss and allow high power transmission at reduced voltage. Therefore HTS cable can transfer more power to be moved in existing ducts, which means very large economical and environmental benefits. A development project for a 22kV class HTS cable is ongoing at a research centers, and the cable manufacturer in Korea. In this paper, we carried out investigation for application of 22kV class HTS cable in Korean utility networks. The results show that the HTS cable is applicable to replace IPB in pumping-up power plant, withdrawal line in distributed generation, withdrawal line in complex power plant, and conventional under ground cable. Finally, as the cost of HTS wire and refrigeration drops, the technical and economical potential of HTS cable is evaluated positively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.409-411
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• 2003

As power demand increases gradually, the call for underground transmission system increases. But it is very difficult and high in cost to construct new ducts and/or tunnels for power cables in metropolitan areas. HTS (High Temperature Superconducting) cable has the several useful characteristics such as increased power density. Therefore HTS cable can allow more power to be moved in existing ducts, which means very large economical and environmental benefits. In this paper, we carried out investigation for Application of 22kV class HTS cable in Korean utility networks. The results show that the HTS cable is applicable to replace IPB in pumping-up power plant, withdrawal line in distributed generation, withdrawal line in complex power plant, and conventional under ground cable. Finally, as the cost of HTS wire and refrigeration drops, the technical and economical potential of HTS cable is evaluated positively.

• 한국ITS학회 논문지
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• 제18권3호
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• pp.58-67
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• 2019

한전의 저압전송전선로로 이용되고 있는 지중저압접속함은 지중선로의 분기나 접속을 목으로 하고 있다. 지중저압접속함은 거리의 미관을 고려하는 효용성에 비하여 여름철 집중호우나 도로의 침수에 의하여 감전사고가 발생하는 등 안전대책이 필요하다. 본 논문에서는 지중저압접속함 내부에 온습도, $CO_2$, 수위, 가속도, 진동 센서를 장착하고 센서 데이터를 지그비모듈을 이용하여 지상으로 데이터를 전송한다. 지상과의 통신을 위한 안테나(볼티드 안테나)를 제안하여 이를 통한 데이터 수신을 확인하였다. 전송된 데이터는 LF 모드 및 HEX모드에서 완벽한 수신 성공률이 확인되었으며, 볼티드 안테나는 난환경 사태에서 실험한 결과 지중상태와 수중상태의 차이는 보이고 있으나, 지중저압접속함으로부터 10m 정도 떨어진 지상과의 통신에는 충분히 수신감도라고 판단되었다. 수신된 데이터는 PC기반의 GUI를 통해 확인할 수 있었다.