• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 E
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• pp.1639-1641
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• 1997

In this study, We developed the 154kV optical fiber incorporated power cable which is combined optical fibers with conventional 154kV power cable. Also, we developed optical unit that optical fiber is inserted in stainless tube. The optical unit was tested, and we got good results enough to safe optical fibers. Also we put the optical fiber incorporated power cable to the test of electrical characteristics and optical characteristics, we knew that the electrical characteristics were the same characteristics as conventional 154kV power cable and the transmission loss change was almost zero. The method of optical unit connection was examined.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.105-106
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• 2006

It is important to identify the exact target optical cable that a worker look for when he executes a cable construction work. Until now, An Optical cable identification work has been done by a manual pulling of an optical cable or by the method of using RF signals. But these methods not only consume much time and labor costs but also have a distance limit of the optical cable to identify. In this paper, we propose a method that uses the phase change signal of the optical interferometer to identify an optical cable. With the proposed method the field worker can have an efficient tool to prevent miscutting the optical cable and can also save operating costs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1828-1830
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• 1996

In this study, We developed the optical fiber incorporated high-voltage underground power cable which is combined optical fibers with conventional high-voltage underground power cable. Optical-Unit that optical fiber is inserted in stainless tube is tested, and we got good results enough to safe optical fibers. Also we put the optical fiber incorporated high-voltage underground power cable to the test of electrical characteristics and optical characteristics, we knew that the electrical characteristics were the same characteristics as conventional high-voltage underground power cable and the transmission loss change was almost zero.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권3호
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• pp.1030-1050
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• 2021

The edges with "bridge characteristic" play the role of connecting the communication between regions in power optical cable network. To solve the problem of mining edges with "bridge characteristic" in provincial power optical cable network, the complex power optical cable network model is constructed. Firstly, to measure the generated potential energy of all nodes in n-level neighborhood local structure for one edge, the n-level neighborhood local structure topological potential is designed. And the minimum connected chain attenuation is designed to measure the attenuation degree caused by substituted edges. On the basis of that, the minimum connected chain attenuation topological potential based measurement is designed. By using the designed measurement, a bridge-edges mining algorithm is proposed to mine edges with "bridge characteristic". The experiments are conducted on the physical topology of the power optical cable network in Jilin Province. Compared with that of other three typical methods, the network efficiency and connectivity of the proposed method are decreased by 3.58% and 28.79% on average respectively. And the proposed method can not only mine optical cable connection with typical "bridge characteristic" but also can mine optical cables without obvious characteristics of city or voltage, but it have "bridge characteristic" in the topology structure.

• 조명전기설비학회논문지
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• 제26권7호
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• pp.77-83
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• 2012

Since power system is switching to smart grid, on-line monitoring technology has become necessary for underground distribution power cable. Therefore, the application of DTS(Distributed Temperature Sensing) technology using OFCPC(Optical Fiber Composite Power Cable) capable of monitoring underground distribution power cables has been developed. These can bring about reductions in faults and increases in operating capacity of underground distribution system. To date, the test-bed of optical fiber composite power cable on-line monitoring system has been constructed. Then, matters to be improved have been drawn through verification experiments. This paper presents the improvement and experiment results of the optical fiber composite power cable on-line monitoring system to apply to underground distribution lines in the field.

• 한국전자통신학회논문지
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• 제1권1호
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• pp.63-69
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• 2006

해저광케이블은 육상광케이블에 비해 장거리이며 광중계기 시스템으로 인해 흔히 사용하는 고장지점에서 후방으로 산란 빛으로 거리를 탐지하는 일반적인 OTDR(Optical Time Domain Reflectormeter)의 사용은 매우 제한적이다. 그래서 해저광케이블 시스템에서 광코어의 단선인 경우는 광중계기의 OTDR Path를 이용한 Coherent OTDR를 사용 고장위치 탐지하고, 광신호의 증폭을 위해 광중계기에 필요한 전력을 공급하는 해저광케이블 내의 동튜브(Copper Tube) 손상시에는 전류/전압특성, 단위정전용량등을 이용한 방법들이 사용된다. 이런 정보를 이용하여 해저광케이블의 고장 형태에 따른 적절한 탐지 기법을 제시하고자 한다.

• 한국정밀공학회지
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• 제21권7호
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• pp.124-129
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• 2004

Recently, the demand for the optical cable is rapidly growing because the number of internee user increases and high speed internet data transmission is required. But the present optical cable winding systems has some serious problems such as pile-up and collapse of cable usually near the flange of the bobbin in the process of the cable winding. To reduce the pile-up collapse in a cable winding systems, a new guiding system is developed for a high-speed self-align cable winding. First of all, the winding mechanism was analyzed and synchronization logics for the motions of winding, traversing, and the guiding were created. A prototype cable winding systems was manufactured to validate the new guiding system and the suggested logic. Experiment results showed that the winding system with the developed guiding system outperformed the system without the guiding system in reducing pile-up and collapse in the high-speed winding.

• 한국통신학회논문지
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• 제42권1호
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• pp.218-226
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• 2017

본 논문은 스마트 폰을 활용하여 광 전송망 구간을 실시간으로 감시하는 시스템이다. 기존의 광 통신망 구간은 스마트 폰과 접속함체의 여장판에 스위치 설치를 활용하여 현장의 상황을 실시간으로 인지 하는 시스템이 없었다. 본 연구는 스마트 폰의 Application과 접속함체 스위치를 이용하여 실시간으로 유지보수를 할 수 있도록 했다. 스마트 폰 Web은 접속함체 장애 위치를 찾는데 유용하며, 접속함체 내부에 있는 여장판 벨크로 타이를 분리하면 스위치가 작동하여 심선의 밴딩을 주어서push message를 발생하게 한다. 접속함체 작업과 장애가 발생하면 스마트폰을 이용하여 OTDR측정을 하여 위치 추적을 할 수 있도록 하는 연구이다. 스마트 폰을 이용하여 실시간 광케이블 구간을 관리함으로써 장애 시간 단축과 전송망 품질을 효율적으로 유지보수 할 수 있다.

• 한국광학회지
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• 제6권4호
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• pp.379-384
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• 1995

광대역 종합통신망 구축을 위해서는 저손실 및 넓은 대역폭을 갖는 광섬유의 사용이 필수적이며 또한 가입자까지 선로를 광케이블화 하기 위해서는 다심광케이블이 필요하다. 다심광케이블의 고밀도 실장 및 일괄접속을 만족하는 케이블 구조로는 리본광섬유가 폭을 가지고 있어 리본광케이블의 구부림시 광섬유 각각의 길이차에 의해 손실이 발생할 수 있기 때문에 유니트의 저장 및 제조상 주의가 필요하다. 본 연구에서는 리본광 케이블 유니트의 구부림 반경에 따른 광섬유의 스트레인과 구부림반경을 이론적으로 계산하였고 또한 손실의 원인인 측압을 계산하였다. 그리고 실험적으로 여러 유니트의 구부림반경에 따라 각 광섬유의 손실을 측정한 결과 이론적 분석 결과와 잘 부합됨을 알 수 있었다. 이 결과는 리본광케이블 제작시 리본광케이블 유니트의 보관 및 제조공정중에 사용할 릴의 적정 반경을 결정하는 것의 중요성을 보여준다.

• Smart Structures and Systems
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• 제30권1호
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• pp.63-74
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• 2022

The deformation coordination between a rock/soil mass and an optical sensing cable is an important issue for accurate deformation monitoring. A stress-controlled triaxial apparatus was retrofitted by introducing an optical fiber into the soil specimen. High spatial resolution optical frequency domain reflectometry (OFDR) was used for monitoring the strain distribution along the axial direction of the specimen. The results were compared with those measured by a displacement meter. The strain measured by the optical sensing cable has a good linear relationship with the strain calculated by the displacement meter for different confining pressures, which indicates that distributed optical fiber sensing technology is feasible for soil deformation monitoring. The performance of deformation coordination between the sensing cable and the soil during unloading is higher than that during loading based on the strain transfer coefficients. Three hypothetical strain distributions of the triaxial specimen are proposed, based on which theoretical models of the strain transfer coefficients are established. It appears that the parabolic distribution of specimen strain should be more reasonable by comparison. Nevertheless, the strain transfer coefficients obtained by the theoretical models are higher than the measured coefficients. On this basis, a strain transfer model considering slippage at the interface of the sensing cable and the soil is discussed.