• Title/Summary/Keyword: Safety Line

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Verification of Reliability by the Induced Voltage of a Downscaled and Simulated 22.9kV-Y Distribution Line (축소 모의된 22.9 kV-Y 배전선로의 유도 전압에 대한 신뢰성 검증)

  • Kim, Jeom-Sik;Choi, Chung-Seog
    • Journal of the Korean Society of Safety
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    • v.30 no.4
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    • pp.26-31
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    • 2015
  • The purpose of this paper is to measure the induced voltage of the downscaled and simulated overhead ground wire of a 22.9kV-Y distribution line. This study performed a test of the downscaled and simulated distribution line according to whether it is grounded or not and the value of the ground resistance. In order to verify the reliability of the data measured by the test, the data was analyzed using the Minitab 17 program. It was found that the induced voltage of the downscaled and simulated distribution line is influenced by the value of the ground resistance. It was also found that the ground resistance obtained at a certain point is closely related to whether electric poles are grounded or not. The analysis results of the measured test data with a statistical method showed that the Anderson Darling (AD) was analyzed to be the smallest as 0.188 when the ground resistance of the electric poles had been maintained at $10{\Omega}$. In addition, the P value analyzed to be 0.894 which is in the proximity of the theoretical value of 1 and verified the reliability of the test data. It could be seen that the data measured by the downscaled simulation test forms a linear graph. It is thought that if a distribution line is installed in the same manner as the downscaled, simulated distribution line, the mean induced voltage will be reduced and reliability will be increased.

A Study on Determining the Priority of Supervising Mooring Line while 125K LNG Moss Type Discharging at Pyeong Taek Gas Terminal

  • Kim, Jong Sung
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.3
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    • pp.278-286
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    • 2019
  • The Port of Pyeong Taek is located on the west coast, meaning that the difference between the rise and fall of tide is great (flood tide 1.8 to 2.9 knots, ebb tide 1.6 to 2.9 knots). Due to mainly N~NW'ly strong winds & high waves during winter, navigating as well as loading & discharging vessels must focus on cargo handling. The strong tidal and wind forces in the Port of Pyeong Taek can push an LNG carrier away from its berth, which will end up causing forced disconnection between the vessel's cargo line and shore-side loading arm. The primary consequence of this disconnection will be LNG leakage, which will lead to tremendous physical damage to the hull and shore-side equipment. In this study, the 125K LNG Moss Type ship docked at No. 1 Pier of the Pyeong Taek is observed, and the tension of the mooring line during cargo handling is calculated using a combination of wind and waves to determine effective mooring line and mooring line priority management. As a result if the wind direction is $90^{\circ}$ to the left and right of the bow, it was found that line monitoring should be performed bearing special attention to the Fore Spring Line, Fore Breast Line, and Aft Spring Line.

Plans to Improve Safety Experience Education through the Experimental Analysis of Evacuation Equipment (피난기구 사용시간 실험분석을 통한 안전체험교육 개선방안)

  • Lee, Jeong Il;Lee, Sung Eun
    • Fire Science and Engineering
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    • v.33 no.6
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    • pp.35-42
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    • 2019
  • The aim of this study is to investigate the direction of improvement of safety experience education through the analysis of the evacuation time experiment. For the study, test subjects were divided into groups of similar body size and weight. The test subjects were directly experienced four evacuation devices, and the experience time was measured. As a result of the analysis of the total time from the installation of the evacuation device to the escape, the time was measured in the order of Descending Life Line-Tilt-Down Rescue Line-Vertical Escape Chute-air safety mat. In the case of evaluating the evacuation time using evacuation mechanisms, the evacuation time was measured in the order of air safety mat-Tilt-Tilt-Down Rescue Line-Descending Life Line-Vertical Escape Chute. In the first and second experiments of the Descending Life Line, time differences were observed. The escape time using the Descending Life Line was reduced in the second experiment than in the first experiment. As shown in this result, education through experience has shown that behavioral confidence and time can be managed. The conclusion of this study is that the goal of safety education is to minimize human life and property damage. Therefore, in order to bring this effect to more people, it is necessary to make efforts to keep self-safe through experiential education.

A Study on the Integrated System and Sensitivity Analysis for Line Capacity Calculation Model (선로용량 계산 모델의 통합과 통합 민감도 분석 체계에 관한 연구)

  • Kim, Mu-Ryong;Kim, Han-Sin;Lee, Chang-Ho;Kim, Bong-Seon;Kim, Dong-Hui;Hong, Sun-Heum
    • Proceedings of the Safety Management and Science Conference
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    • 2005.11a
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    • pp.30-39
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    • 2005
  • Line capacity calculation has been used to determine optimum efficiency and safe train service for train scheduling plan and investment priority order throughout detecting bottleneck section. Because of some problems of Yamagisi and UIC methods for line capacity calculation, developing of the method of line capacity calculation and evaluation for the Korea circumstance is important. This paper deals with the integrated system of TPS(Train Performance Simulator), PES(Parameter Evaluation Simulator), LCS (Line Capacity Simulator) and sensitivity analysis for line capacity calculation model.

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The Legal Issue in the Recent South-North Korean Naval Engagement: An Appraisal on The North Korean Theory of the Sea Demarcation Line in the Western Sea. (남해사태: 남북한 해상경계에 관한 북측 주장의 법적문제)

  • 김영구
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.5 no.2
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    • pp.125-139
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    • 1999
  • Thanks to the fact that the 1953 Korea Armistice Agreement does not have any clear provisions on the sea demarcation line, the North Korea insists that the sea demarcation line in the Yellow Sea Area should not be the NLL designated by the Commander in Chief. UN Command, unilaterally, but the hypothetical extention of the Latitude Parallel from the end of the provincial boundary line between Whanghae-do and Kyongki-do In those unique situations at the end of the Korean War, the cease-fire line on the part of the western sea area, a logically indispensable element of the contents of an armistice agreement, however has formed and crystallized by the act of the UN Command designating the NLL. In implementing the South-North Korean Basic Relations Agreement, a fair and clear common consent on the sea demarcation line in the western sea area should be deliberated.

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A Study on the Reliability Improvement of the Integrated System and Sensitivity Analysis for Line Capacity (선로용량 산정과 민감도 분석의 신뢰성 향상에 관한 연구)

  • Kim Moo-Ryong;Kim Han-Xin;Lee Chang-Ho;Kim Bong-Sun;Kim Dong-Hee;Hong Soon-Hum
    • Journal of the Korea Safety Management & Science
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    • v.7 no.4
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    • pp.207-217
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    • 2005
  • Line capacity calculation has been used to determine optimum efficiency and safe train service for train scheduling plan and investment priority order throughout detecting bottleneck section. Because of some problems of Yamagisi and UIC methods for line capacity calculation, developing of the method of line capacity caculation and evaluation for the Korea circumstance is important. This paper deals with the reliability improvement on the integrated system of TPS(Train Performance Simulator), PES(Parameter Evaluation Simulator), LCS(Line Capacity Simulator) and simulation and sensitivity analysis for line capacity.

Line Capacity Estimation in Railways (철도에서의 선로용량 산정에 관한 연구)

  • 김동희;김봉선
    • Proceedings of the Safety Management and Science Conference
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    • 2002.05a
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    • pp.257-262
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    • 2002
  • There are two methodologies to increase transport capacity of railway. The one is to invest railroad equipment or vehicles, and the other is to improve operation efficiency through optimization. All of these is intended to increase transport capacity by improving line capacity So far, we treat line capacity as the criteria for evaluating investment alternatives or for restricting tram frequencies, and this criteria is calculated statical and experimental numerical formula. But, line capacity has special attribute that change dynamically according to operational condition, so there is a need of new line capacity estimation system. The Purpose of this paper is to present a new line capacity estimation system based on the probability simulation and its applications.

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Management and operation of K-AGT test line (한국형경량전철 시험선의 관리 및 운영)

  • Han, Seok-Youn;Jun, Bong-Roong;Lee, Ho-Yong;Lee, An-Ho
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.964-967
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    • 2006
  • Korea Railroad Research Institute (the following 'KRRI') built AGT test line in Gyeong San-city, Kyongsang-bukdo province, Korea on August, 2004. This test line is exclusively used for the test of the driverless rubber-tired AGT system, and applied with research result of AGT System Development Project like vehicles, power supply, control and signaling, track and infrastructure system. The test line is available for the test of rubber tired AGT system's performance, function, safety. In this paper, we described the operation system of test line for the test of performance, safety, reliability, and also system operation in emergency. Finally we present the operation result of test line.

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A review of Safety standards for insulating materials in overhead contact line (전차선로 절연물의 안전성 평가기준 검토)

  • Lee, Bong-Jae;Jung, Ho-Sung;Lee, Ki-Won;Kwon, Sam-Young;Lee, Ki-Seung;Cho, Ho-Ryung
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.269-274
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    • 2008
  • The Seoul subway is acting the center of public transportation after the opening of the first line on August 15, 1974. and the subway line of the DC traction system is running and building to the ninth line. However, the main insulation parts used in overhead contact line are now imported from overseas products. Therefore, this paper considers domestic manufacture technology, supply easiness and economic effectiveness of insulation products and reviews the safety of support insulator used in rigid conductor line, stem insulator used in movable bracket and AC/DC different phase section insulator that localization development is necessary.

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Development of Parameter Evaluation Model for Calculating Railroad Line Capacity (철도선로용량 계산을 위한 모수 평가모형 개발)

  • 이병권;김학식;이창호;김봉선;김동희
    • Proceedings of the Safety Management and Science Conference
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    • 2003.11a
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    • pp.407-412
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    • 2003
  • Railroad line capacity is influenced by Quantitative and Qualitative factors which is applied by parameter to calculate it. But these parameters have been used experiential value without analyzing its reasonability or appropriate level. In this paper, we introduce the concept of robustness to Quantify parameter and evaluate robustness of it. For this purpose, we develop parameter evaluation simulator and present it. If this simulator is utilized, we can find the parameter having appropriate robustness and it will be applied to calculate more reasonable and systematic railroad line capacity.

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