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플리머 절연물 소재의 전기적 및 복합열화 특성평가 기술
안명상(Ahn Myeong Sang),박효열(Park Hoy Yul),나문경(Na Moon Kyeong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
There have been numerous accelerated aging laboratory tests for evaluating suitability of polymeric materials and devices. Aging test for materials and its full scale device has been conducted. Service experience plays a key role in the utility section of composite insulators. A meaningful and reliable accelerated aging test is needed for evaluating composite insulator. During the service these insulators are subjected to aging stress such as humidity, pollution, and electrical field, and erosion and tracking of the weathershed occurs. This paper presents the criteria of reliability evaluation and evaluation facilities for 22.9㎸ suspension composite insulator. We adopt the criteria of reliability evaluation consist of two test methods. One is CEA tracking wheel test for examining the tracking and erosion performance of composite insulator. The other is multi-stress aging test for examining effects of environmental factors such as UV, temperature, humidity, etc on composite insulator.
박효열(Hoy Yul Park),안명상(Myeong Sang Ahn),나문경(Moon Kyong Na) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
FRP has been used much for core materials of insulator. FRP consists of fiber and plastics(resin and binder). The fiber contributes strength to FRP. The fiber orientation in FRP has a great effect on the strength of FRP because the strength of FRP mainly depends on the strength of fiber. The direction of applied stress of FRP is different from the kinds of insulators. In this study. inner part of FRP rod was made unidirectionally by pultrusion method and outer part of FRP rod was made by filament winding method. Compressive strength and stress of FRP rods were simulated according to the winding orientation of glass fiber. Simulated value and real evaluated compressive strength were compared each other.
태양열 흡수체용 구리산화막의 표면특성 및 저방사코팅 연구
강동필(Kang Dong-Pil),박효열(Park Hoy-Yul),나문경(Na Moon-Kyong),안명상(Ahn Myeong-Sang),이태주(Lee Tae-Joo),장태순(Jang Tae-Soon),이종엽(Lee Jong-Yup),김춘열(Kim Chun-Yeol) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study was done on surface property of surface-oxidized copper for solar absorber and low emissivity coated on solar absorber. As surface temperature of solar energy absorber increases, most solar energy absorbers emit the energy into infrared rays. For increasing the efficiency of collecting sun energy, low emissivity coating on solar energy absorber is needed. Temperature elevation characteristics of solar energy absorber was influenced by surface condition of solar energy absorber and low emissivity coating material.<br/> Surface-oxidized coppers were prepared for solar energy absorber. The temperature elevation property of surface-oxidized copper absorber was examined with several insulation conditions to minimize the heat loss through conduction and convection. Two kinds of low emissivity materials and silica sol were coated on the surface-oxidized copper absorber. And then the surface properties, surface condition and roughness, were observed. Temperature elevation characteristics of solar energy absorber was influenced by surface condition of solar energy absorber and low emissivity coating material. Thin and uniform surface of low emissivity coating can reduce the emission of thermal energy.