• 유기물자원화
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• 제26권1호
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• pp.39-45
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• 2018

FA(Fly ash)에 대해서는 연구가 활발히 진행되는 반면 BA(Bottom ash)의 연구실적은 많지 않으며, 특히 BA 재활용 분야의 연구가 절실히 요구된다. 따라서 본 연구에서 다공성인 건식(공랭식) BA를 연구대상으로 선택해 이를 재료로 활용하여 만든 BA 모르터와 일반 모르터를 비교 분석하여 BA 모르터의 경량 및 단열 특성을 알아보고자 하였다. BA의 경량성을 알아보기 위해 밀도 시험, 단위용적질량 시험, SEM 시험을 하였으며, 단열 시험을 위해 BA 모르터와 일반 모르터 몰드를 KS A 0006에서 정한 상온 상습의 환경조건에서 제작 후 항량이 될 때까지 온도 $105{\pm}2^{\circ}C$에서 건조하였다. 경량성 시험 결과 BA 모르터의 경량성은 일반 모르터의 0.72배로 일반 모르터에 비해 약 30%정도 가볍게 측정되어 BA를 건축물 재료로 활용할 경우 건축물 하중을 줄이는데 크게 기여할 것이다. 또한 단열 시험 결과 BA 모르터의 열전도율은 일반 모르터의 0.70배로 약 30%정도 단열성이 우수하다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.234-238
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• 2001

This study aims to review the present conditions of domestic laboratory test facilities for measuring impact sound insulation. The result will be useful to establish the new Korean Standard to coincide with ISO 140-6.

• 한국전기전자재료학회논문지
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• 제19권6호
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• pp.586-590
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• 2006

This paper deals with the application of a partial discharge (PD) test on low-voltage electrical and electronic devices, which is recently being accepted as a non-destructive and a effective dielectric test method. A comparative analysis combined with the Withstand Voltage Test (WVT) specified in IEC standards was carried out on low-voltage insulation transformers. The results showed that the WVT causes insulation degradation of the specimen during the test by applying high voltage. However, the PD test can be performed in ranges from 30 % to 50 % of the test voltage specified in the WVT. Therefore, the PD test is successfully applicable for a non-destructive test method on low-voltage electrical and electronic devices as a replacement of the WVT.

• 조명전기설비학회논문지
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• 제14권1호
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• pp.14-21
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• 2000

본 논문은 수트리 열화된 가교폴리에틸렌(XLPE) 절연 지중케이블의 절연회복을 위해 개발된 실리콘 처리 기법의 현장적용 가능성을 검토하기 위해 수트리 열화된 325 $\textrm{mm}^2$ CN/CV 케이블을 수거하여 실리콘 처리하고, 시간의 경과에 따른 절연성능 향상도를 분석한 것이다. 시료 케이블의 절연회복을 평가하기 위해 교류절연파괴시험을 실시했다. 또 실리콘 처리케이블의 평가를 위해 진단시험 및 케이블 특성평가를 수행했다. 실리콘 처리후 1년 경과 시료 케이블올 분석한 결과, 실리콘액(silicone fluid)과 수분이 효과적으로 결합해 절연파괴강도가 상당히 증가한 것으로 나타났다. 실험결과를 종합해 볼 때 수트리로 열화된 케이블의 절연성능 향상에 실리콘 처리가 효과적인 것으로 나타났다.

• 한국초전도ㆍ저온공학회논문지
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• 제22권3호
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• pp.13-19
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• 2020

This study presents the experiment and simulation results on the magnetic field response and electrical stability behaviors of no-insulation (NI) and metal insulation with stainless steel tape (MI-SS) which wound in form of racetrack type coils. First of all, the structural design of the racetrack type bobbin was shown along with its parameters. Then, the current-voltage tests were carried out to measure the critical current of both test coils. Also, the sudden discharging and charging tests were performed in the steady state to estimate the decay field time and magnetic field response, respectively. Finally, the overcurrent tests were conducted in the transient state to investigate the electrical stability of these test coils. Based on the experimental results, the contact surface resistances were calculated and applied to the field coils (FCs) of 10-MW-class second generation high temperature superconducting generator (2G HTSG) used in wind offshore environment. The charging delay time and electrical stability for NI and MI-SS HTS FCs of 10-MW-class 2G HTSG are analyzed by the equivalent circuit model and the key parameters which were obtained from the electromagnetic finite element analysis results.

• 한국안전학회지
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• 제20권2호
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• pp.98-104
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• 2005

Saw dust concrete f3r finding out insulation characteristic was tested using test plate $30cm{\times}30cm{\times}5cm$. basically, molds f3r the test of compressive, tensile, normal without sawdust, $0.05\%,\;0.1\%,\;0.2\%,\; 0.4\%,\;0.6\%,\;0.8\%,\;1.0\%,\;1.2\%,\;1.4\%,\;1.6\%,\;1.5\%,\;2.0\%$, mixing proportion. heat conductivity of the saw dust concrete mixed with the above proportion was taken in this study. Thermal conduction of normal concrete depends on mixing proportion strength aggregate character, water content. all these items are specified here in fables. $1.8\%\~2.0\%$ saw-dust mising concrete shows as the faction as normal insulation material has its function. and the higher saw-dust mixing rate becomes, the thermal conduction becomes the less Then, the conclusions are that saw-dust using concrete has better insulation function than normal concrete.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 제2회 학술대회 논문집 일렉트렛트 및 응용기술전문연구회
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• pp.31-35
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• 2000

We worried about the technology difference between our company and the advanced company at present motor market and are asked to set up the independent coil insulation system to accumulate insulation technology data. And to export our products at oversee market, we are asked to the evaluation of insulation performance to show our product excellence. In this study, we evaluated the insulation system of our motor, and studied the insulation diagnosis technology systematically to do site diagnosis. We are now accumulating the measured data. And also to reduce the initial insulation failure, we performed the insulation characteristic test and acquired the data to evaluate the initial soundness. We are doing the improvement of the insulation system. And also these data were used to new product development as very useful data, also will be used in the insulation deterioration diagnosis to estimate the remained life time which is very important data for the maintenance management. As the result, we were able to get our product reliability.

• 한국전기전자재료학회논문지
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• 제23권10호
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• pp.804-808
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• 2010

In this paper, we studied the dielectric breakdown voltage characteristics by the AC withstand voltage test on using green insulation dry air instead of $SF_6$ insulation gas used in the GIB (gas insulated bus) of 362 kV GIS (gas insulated switchgear). The AC withstand voltage test applied to the standard KEPCO's 362 kV GIB with dry air insulation, and the equivalence of dielectric breakdown voltage for dry air and $SF_6$ gas were examined, and the empirical formulas of dielectric breakdown voltage for dry air were calculated, and the criterion of AC withstand voltage test for dry air insulation was derived. Using the criterion, dry air can be used instead of $SF_6$ gas for 362 kV GIB in the factory acceptance test was confirmed.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권8호
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• pp.420-424
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• 2004

This paper presents experimental data from model windings with different arrangement of coil in order to provide information to design a 22.9kV class HTS transformer. Before experiment, the composite insulation of two different type of HTS transformers are investigated. The first basic of investigation is a breakdown characteristic of liquid nitrogen and flashover characteristic on the GFRP surface under ac and impulse, The second investigation is insulation design, manufacture and test of model windings. These include a AC withstand voltage test of 50 kV rms and a lighting impulse test of 150 kV at peak.

• 한국초전도ㆍ저온공학회논문지
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• 제22권1호
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• pp.17-23
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• 2020

Cryogenic insulation systems, with proper materials selection and execution, can offer the highest levels of thermal performance. Insulations are listed in order of increasing performance and, generally, in order of increasing cost. The specific insulation to be used for a particular application is determined through a compromise between cost, ease of application and the effectiveness of the insulation. Consequently, materials, representative test conditions, and engineering approach for the particular application are crucial to achieve the optimum result. The present work is based on energy cost balance for optimizing the thickness of insulated chambers, using foamed or multi layered cryogenic shell. The considered insulation is a uniformly applied outer layer whose thickness varies with the initial and boundary conditions of the studied vessel under steady-state radial heat transfer. An expression of the optimal insulation thickness derived from the total cost function and depending on the geometrical parameters of the container is presented.