• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.389-391
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• 2022

Efforts by the Ministry of Environment and local governments in Korea are continuing to manage the aging of water supply and sewage buried underground. With the support of the Korea Institute of Environmental Industry and Technology's water and sewage innovation technology development project, it is conducting a project to predict and exchange accidents due to aging, and to apply smart functions to new buried pipes. As one of these studies, this paper proposes the design of a dashboard concept model for digital twin-based smart pipe health monitoring, one of the key features of the entire study. Since remote control and monitoring are one of the main functions, distributed transmission and reception agents are deployed to visualize monitoring situations in real time and to increase user affinity by deploying intuitive UI. To validate the design of this proposed special digital twin based smart pipe state monitoring, we construct the conceptual model level and measure the agent effectiveness to validate its excellence.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.513-514
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• 2011

본 논문에서는 154kV 지중송전선로의 관로내 XLPE 케이블에서 발생하는 절연파괴 고장원인을 분석하였다. 일반적으로 케이블은 제조공정 과정에서 결함을 철저히 걸러내도록 조치하고 공장 출하시 시험을 통해 점거하고 있어, 케이블 자체고장은 현장에서 시공하는 접속함에 비해 매우 작지만 드물게 발생하고 있다. 케이블 자체에서 고장 발생시 고장원인 파악을 위해 제조 품질, 시공과정 등을 체계적으로 분석하고 검토하여 케이블 생산, 시공현장 품질저하 및 관리소홀 등으로 인한 케이블 고장을 최소화하고자 한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.379-380
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• 2015

본 논문에서는 지중송전계통에서 OF 케이블 선로 절연접속함(IJ)의 부분방전 특성을 분석하기 위하여 복합절연 모델링이 가능한 EMTP LCC Enclosing Pipe를 이용하여 IJ를 모델링한 후 IJ 절연보강층의 한 부분에서 부분방전전압을 인가한 후 신호를 분석하는 방법으로 IJ의 부분방전 특성을 해석하였다.

• 전기의세계
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• v.20 no.5
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• pp.27-34
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• 1971

본고에서는 지중선로는 그 시공이 곤란하고, 사고수리기간도 길고, 한편 가공선로에 비교해서 9배이상의 건설비가 소요되고, 따라서 전기요금도 인상케 할 요인이 되므로 그 건설은 가능한 기피해야하나, 고층건물이 속출하는 도시에서는 그 사용이 불가피하고, 현재로서는 별다른 대안이 없다. 현재 한전은 당인리발전소와 용산변전소간에 간에 154KV OF cable 지중선로를 건설중에 있고, 1973년경에는 본문의 pipe type cable의 지중선로가 실현될것이 예기된다. 그리고 이외에 서울에서 5개소, 부산에서 2개소의 지중선로계획이 추진중에 있다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.1070-1072
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• 2003

In this paper, Firstly, it is shown that the high vibration source of piping system is the pulsation transmission of pipe line element ,such as, orifice plate, valves and the control valve is a broad band source and the branch wall and the cavity have vortex frequency Secondly, in order to decrese the turbulence vibration of piping system, the practical analysis of piping flow by EFD have been developed and its effectiveness is investigated as applying it at piping system practically.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.10a
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• pp.56-64
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• 1996

In this paper, the sound radiation level of parts of a O.B. Motor was measured and analyzed by the measurement method using wave-guide reverberation environment. Based on the above measurement results, a noise control was established for engine cover and exhaust silencer and its effects were compared and analyzed. The noise control method increased transmission loss by painting GELNAC on the engine cover and extend exhaust pipe to reach under water.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.54 no.2
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• pp.55-62
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• 2005

The optical CT was developed to use twisted fibers for 170 kV GIS. The fiber sensor optimized on the optical CT was wound 3 turns and twisted 4 times per a turn at the pipe with a diameter of 130 mm. The measurement error for the linearity which was satisfied the criterion of 'IEC Class-1.0' was less than ± 0.44 % at the transmission type and ± 0.82 % at the reflection type to 2,000 A. At a low current to 200 A, the measurement error was ± 0.69% at the transmission type and ± 1.38 % at the reflection type.

• Journal of Drive and Control
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• v.15 no.4
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• pp.67-73
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• 2018

The paper deals with an approach to time domain simulation for closed end at the downstream of pipe, hydraulic lines terminating into a tank and series lines with change of cross sectional area. Time domain simulation of a fluid power systems containing hydraulic lines is very complex and difficult if the transfer functions consist of hyperbolic Bessel functions which is the case for the distributed parameter dissipative model. In this paper, the magnitudes and phases of the complex transfer functions of hydraulic lines are calculated, and the MATLAB Toolbox is used to formulate a rational polynomial approximation for these transfer functions in the frequency domain. The approximated transfer functions are accurate over a designated frequency range, and used to analyze the time domain response. This approach is usefully to simulate fluid power systems with hydraulic lines without to approximate the frequency dependent viscous friction.

• Transactions of the Korean hydrogen and new energy society
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• v.35 no.2
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• pp.216-229
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• 2024

Pipeline steels for hydrogen transmission may cause hydrogen embrittlement due to absorption and diffusion of hydrogen through metals. Hydrogen pipes exhibited similar mechanical properties to atmospheric conditions in terms of tensile and yield strength in a hydrogen atmosphere. This paper aims to provide relevant information regarding hydrogen embrittlement in hydrogen transmission pipeline.

• Journal of Korean Tunnelling and Underground Space Association
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• v.19 no.3
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• pp.449-461
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• 2017

The uncertain existence and insufficient information of underground structures, such as pipe lines and cable tunnels, is causing many problems related to route plan, design, construction of new underground structures. The theoretical equations that is able to predict the location, size, and direction of underground structures through electric field analysis are suggested at the previous study (Ryu., 2015). Three field tests were performed for predicting the location, size, and direction of underground structures and the existence and size of sink-hole. Prediction results were reflected at the design and follow-up measures were performed.