• Title/Summary/Keyword: thermal oil system

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In-Bi-Sn Alloy Sheet for Thermal Fuse Element of Secondary Battery Safety System (이차전지온도퓨즈용 In-Bi-Sn계 가용합금박판 연구)

  • Youn, Ki-Byoung
    • Resources Recycling
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    • v.26 no.5
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    • pp.22-28
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    • 2017
  • In-Bi-Sn alloy sheet has been used as a thermal fusible parts of secondary battery safety system. This study offers a simple process to make In-Bi-Sn alloy fusible parts. The process consists of two procedures, melting and sheeting by tape casting. 62.5 wt%-In 20.0 wt%-Bi 17.5 wt%-Sn (M.P. $92.4^{\circ}C$) alloy sheet obtained by tape casting was used as the thermal fusible sheet of thermal fuse system for mobile telephone. The performance test of the system was carried out in oil bath, and the fusible alloy sheet was melted and cut off at $95^{\circ}C$. This results confirmed the possibility that the alloy sheet obtained by tape casting can be usable as a thermal fusible parts of battery safety system. And this process can be applied as a simple process to recycle the In-Bi-Sn alloy scrap separated from the used thermal fuse system.

Application of FDS for the Hazard Analysis of Lubricating Oil Fires in the Air Compressor Room of Domestic Nuclear Power Plant (국내 원자력발전소의 공기 압축기실에서 윤활유 화재의 위험성 분석을 위한 FDS의 활용)

  • Han, Ho-Sik;Hwang, Cheol-Hong;Baik, Kyung Lok;Lee, Sangkyu
    • Journal of the Korean Society of Safety
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    • v.31 no.2
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    • pp.1-9
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    • 2016
  • The standard procedure of fire modeling was reviewed to minimize the user dependence, based on the NUREG-1934 and 1824 reports. The hazard analysis of lubricating oil fires in the air compressor room of domestic nuclear power plant (NPP) was also performed using a representative fire model, FDS (Fire Dynamics Simulator). The area ($A_f$) and location of fire source were considered as major parameters for the realistic fire scenarios. As a result, the maximum probability to exceed the thermal damage criteria of IEEE-383 unqualified electrical cables was predicted as approximately 70% with $A_f=1m^2$. It was also found that for qualified electrical cables, the maximum probabilities of exceeding the criteria were 2% and 90% with $A_f=2$ and $4m^2$, respectively. It was concluded that all electrical cables should be replaced with IEEE-383 qualified cables and the dike to restrict as $A_f{\leq}2m^2$ should be installed at the same time, in order to assure the thermal stability of electrical cables for lubricating oil fires in the air compressor room of domestic NPP.

Premature Failure Analysis of Servovalve Components for a Thermal Power Plant

  • Chang, Sung-Yong;Chang, Joong-Chel;Kim, Bum-Soo;Seo, Min-Woo;Choi, Chel-Jong
    • Korean Journal of Metals and Materials
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    • v.49 no.9
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    • pp.708-714
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    • 2011
  • The premature failure of a servovalve used for six months in a thermal power plant has been analyzed. The servovalve was made of stainless steel, containing 16Cr-0.44Mo, along with other elements. An overload of oil-supply pumping and an abnormal increase in the oil flux were observed during operation. A study revealed that erosion and corrosion could be the main causes of the failure. The visual examination of the servovalve did not show any appreciable damage. However, corrosion and erosion of the servovalve were observed using scanning electron microscopy (SEM). Upon examination of the servovalve, the corrosion was found to have occurred throughout the bushing and spool; however, erosion occurred at only the edge-side. In addition, the condition of the electrohydraulic control system (EHC) oil was investigated with respect to its satisfaction of the management standard.

Application of On-line Diagnostic System for Oil-filled Power Transformers (대용량 변압기 예방진단 시스템 적용 사례)

  • Kim Y.H.;Lee C.R.;Hwangbo S.W.;;Shin Y.T.;Park K.S.;Lee J.B.
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.590-593
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    • 2004
  • This paper presents recent trends on the on-line monitoring and diagnostic systems for oil-immersed transformers. Specially, our system on YeoSu thermal power plant is introduced for high sensitivity and accuracy of ours. It is combined with communication networks to provide an on-line remote monitoring system. Several alarm criteria are formulated to enable a superimposed monitoring system to perform decisive action. The reasons for monitoring the condition and maintaining the health of electrical apparatus were discussed. The experience at the fields and the criteria for the judgment are also discussed in detail.

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Experimental Study on Thermal Analysis of Steering Control ECU Structure for Electric Vehicles (전기자동차용 조향장치 제어 ECU 구조의 열해석에 관한 실험적 연구)

  • Kim, Hae-Ji
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.5
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    • pp.113-119
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    • 2015
  • The technical development of electric vehicles has been actively proceeding because of the reduction of oil resources and need for eco-friendly vehicle technology. In particular, an electronic control unit is an important element in the technology of electric vehicles due to the motor drive system. This paper concerns an experimental study on the thermal analysis of the steering control ECU structure for an electric vehicle. The ECU unit is designed for eight heat sinks for the thermal analysis of the ECU structure. The thermal analysis characteristics of the ECU structure are evaluated by the temperature distribution, heat flow, von Mises stress, total translation, and external surface temperature measurement of the ECU unit.

The Thermal Analysis of Pole Mount Mold Transformer with One-body Molding by Duct Condition (일체형 주상용 몰드변압기의 덕트에 따른 열해석 특성 연구)

  • Cho, Han-Goo;Lee, Un-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.1135-1138
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    • 2003
  • The transformer is major equipment in power receiving and substation facilities. Necessary conditions required for the transformer are compactness, lightness, high reliability, economic advantages, and easy maintenance. The pole-mount transformer installed in distribution system is acting direct role in supply of electric power and it is electric power device should drive for long term. Most of modem transformer are oil-filled transformer and accident is happening considerable. The mold transformers have been widely used in underground substations in large building and have some advantages in comparison to oil-transformer, that is low fire risk, excellent environmental compatibility, compact size and high reliability. In addition, the application of mold transformer for outdoor is possible due to development of epoxy resin. The mold transformer generally has cooling duct between low voltage coil and high voltage coil. A mold transformer made by one body molding method has been developed for small size and low loss. One body molding transformer needs some cooling method because heat radiation between each winding is difficult. In this paper, The thermal analysis of pole mount mold transformer with one body molding by duct condition is investigated and the test result of temperature rise is compared with simulation data.

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Development and Evaluation of 3-terminal Type Capacitive Sensor for the Diagnosis of Electrical Insulating Oil (전기 절연유 열화진단을 위한 3-단자식 전기용량 센서 개발 및 진단특성 평가)

  • Kim, Ju-Han;Han, Sang-Ok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.476-482
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    • 2009
  • This paper describes the development of capacitive sensor for the diagnosis of liquid dielectrics, which is widely used as the electrical insulating oil of transformer, circuit breaker, cable and etc. To survey the dielectric properties of the virgin and aged electrical insulating oils, we utilized the highly precise measuring system, using the principle of cross capacitance. The measured properties were used to determine the design factors of the sensor. Then the factors were optimized with the help of computational analysis. To evaluate diagnosis by the sensor, we performed accelerated thermal aging test about electrical insulating oils. The condition of aged specimens were investigated by measurements of relative permittivity i.e. capacitance change by capacitive sensor. And to evaluate the hysteresis characteristics with the change of temperature, we constructed a testing system, which was composed with vacuum drying oven, oil chamber and measuring instruments, such as LCR meter, MUX and so forth. Through the results of this investigation, we confirmed the superior characteristics of the newly developed sensor.

A study on an experimental basis a special character of insulating oil the use of a transformers (변압기용 절연유의 특성에 관한 실험적 연구)

  • Kim, Sung-Dae;Park, Il-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.5188-5193
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    • 2011
  • This research is for temperature control of insulating oil inside the transformer. After I designed and manufactured various systems using Peltier element, which was thermal element, and Heat pipe, which was a cooling system, without electric power. The optimum system could be made by applying them to the temperature control for the insulating oil. I could verify that the combination type of Heat pipe 100 W+ Peltier 100W has a more outstanding capacity than pure Heat pipe 300 W within 60 degrees Celsius through experiments. Through this, I verify that the method of a proper design is prominent, and make an attempt at contribution to power saving effect and more effective control of Distributing board by using this combination type.

Friction Power Loss Reduction for a Marine Diesel Engine Piston (박용엔진 피스톤 스커트 프로파일 변경에 의한 마찰손실(FMEP) 저감 연구)

  • An, Sung Chan;Lee, Sang Don;Son, Jung Ho;Cho, Yong Joo
    • Tribology and Lubricants
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    • v.32 no.4
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    • pp.132-139
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    • 2016
  • The piston of a marine diesel engine works under severe conditions, including a combustion pressure of over 180 bar, high thermal load, and high speed. Therefore, the analyses of the fatigue strength, thermal load, clamping (bolting) system and lubrication performance are important in achieving a robust piston design. Designing the surface profile and the skirt ovality carefully is important to prevent severe wear and reduce frictional loss for engine efficiency. This study performs flexible multi-body dynamic and elasto-hydrodynamic (EHD) analyses using AVL/EXCITE/PU are performed to evaluate tribological characteristics. The numerical techniques employed to perform the EHD analysis are as follows: (1) averaged Reynolds equation considering the surface roughness; (2) Greenwood_Tripp model considering the solid_to_solid contact using the statistical values of the summit roughness; and (3) flow factor considering the surface topology. This study also compares two cases of skirt shapes with minimum oil film thickness, peak oil film pressure, asperity contact pressure, wear rate using the Archard model and friction power loss (i.e., frictional loss mean effective pressure (FMEP)). Accordingly, the study compares the calculated wear pattern with the field test result of the piston operating for 12,000h to verify the quantitative integrity of the numerical analysis. The results show that the selected profile and the piston skirt ovality reduce friction power loss and peak oil film pressure by 7% and 57%, respectively. They also increase the minimum oil film thickness by 34%.

Effect of Organic Residue on the Continuous Pyrolysis of Waste Polystyrene (연속식 폐 EPS 열분해 반응에 대한 잔류물의 영향)

  • Yoon, Byung Tae;Kim, Seong Bo;Lee, Sang Bong;Choi, Myoung Jae
    • Korean Chemical Engineering Research
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    • v.43 no.1
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    • pp.125-128
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    • 2005
  • Oil formation rate, composition of crude oil and formation of side products such as ${\alpha}-methyl$ styrene, ethyl benzene, benzene, toluene, dimer and trimer on thermal degradation of polystyrene were affected by various factors. Especially, formation of organic residue formed during reaction gave an important influence on formation of oil and composition of crude oil. Also, composition of formed crude oil showed a significant difference on reaction time. These results were caused by organic residue and carbonized solid formed during continuous reaction. Increase of residue and carbonized solid gave a decrease of yield of styrene and an increase of formation of ${\alpha}-methyl$ styrene, ethyl benzene, benzene, toluene. New reaction system was proposed for continuous operation at the thermal degradation of polystyrene.