• Title/Summary/Keyword: salt-fog

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Development of Polymeric Water Absorbent Film(PWAF) for the Collection of Size-classified Fog Droplets

  • Ma, Chang-Jin;Mikilo-kasahara;Park, Kum-Chan
    • Journal of Korean Society for Atmospheric Environment
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    • v.17 no.E1
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    • pp.17-24
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    • 2001
  • For the purpose of collecting fog droplets as a function of size a new sampling method was developed in this study. Formation of 100$\pm$10㎛ thickness of polymeric water absorbent film (PWAF) on a nuclepore filter could be successfully realized. Also applicability of particle induced X-ray emission (PIXE) method to the chemical analysis of size-segregated fog droplets collected on PWAF was examined experimentally with synthetic fog droplets generated from a nebulizer. Absorption capacity of S-PAAS polymeric water absorbent shows marked decreases in the range less than 1 wt% and slight decrease between 1 and 3.5 wt% of every salt concentration. Dependency of absorption capacity on pH shows the maximum at pH 7. No apparent peak which can influence the quantitative analysis of elements dissolved and suspended in fog droplets was found at PIXE spectrum of PWAF blank. PWAF kept the original shape without rupture under the PIXE analytical conditions of beam intensity for 10 to 60 nA and irradiation time of 4∼5 min. It should be said that the proposed new technique in the work is helpful to get more detailed information of fog droplets, to clarify the fog formation processes, and to develop a model of acid deposition process.

A real-time image-based sea fog observation system based on local lighthouse (항로표지 거점을 활용한 실시간 영상기반 해양안개 관측시스템 구축)

  • Mookun Kim;In-kwon Jang;Hyeong-ui Lee
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2023.11a
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    • pp.23-26
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    • 2023
  • In the past, in observing the sea fog on the major sea route and providing real-time information for the safe operation of ships, a visibility sensor or a fog detector with similar operating principles was installed to observe local fog near the place where it was installed. However, it was somewhat unreasonable to immediately provide sea fog observation information to ships and users because the reliability of real-time observation information was somewhat low due to pollution caused by dust, salt, and pollen, or malfunctions of detection sensors by organisms such as spider webs. From 2019 to 2022, the Korea Meteorological Administration and the Ministry of Oceans and Fisheries collaborated to build a more reliable real-time image-based sea fog observation system in 100 regions of the Lighthouse on major sea routes across the country to collect reliable sea fog observation information every 10 minutes and perform real-time public service(webpage).

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A Study on Measurement of ESDD and Contamination Performance of Polymeric Outdoor Insulators (옥외용 절연체 표면에서의 ESDD 측정과 내오손특성에 관한 연구)

  • 연복희;유형철;이현진;송정용;이태호;허창수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.427-430
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    • 2002
  • This paper presents on contamination performance of polymeric outdoor insulator with different contaminant accumulation. The ESDD (equivalent salt deposit density), tracking resistance and clean-fog test were performed to investigate the characteristics of contamination performance on polymeric outdoor insulator. Furthermore, we evaluated together with the porcelain samples for its comparison. It is found that ESDD of polymeric and porcelain insulator depends on the installation position. This surface accumulation of contaminant lead to the loss of surface hydrophobicity, expecially upper shed part of polymeric insulator. In addition, the effect of an artificial contaminant on the tracking resistance by inclined-plane method and leakage suppression ability under clean fog was surveyed. The time of tracking failure did not appear to change significantly with a much contaminant accumulation, while leakage current under clean-fog increased.

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The Characteristics of EPDM by Exposure to Salt Fog and Ultra-violet (염무 및 자외선에 의한 EPDM의 전기적 특성변화)

  • Choi, Nam-Ho;Kim, Jae-Hoon;Jo, Hee-Yon;Park, Kang-Sik;Han, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 1998.07d
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    • pp.1413-1415
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    • 1998
  • This study deals with the aging effect of EPDM, to understand the surface hydrophobicity mechanism and electrical characteristics due to UV irradiation and salt fog. A mini chamber was fabricated for this test. The specimen was subjected a specific aging cycle. With the result of various analysis methods and investigation, we could make a advanced understanding to the aging mechanism, like as the relationships of the surface morphology and surface electrical characteristics.

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The Change of Electrical Properties on Silicone Rubber Contained ATH under Cyclic Aging(I) (ATH를 첨가한 실리콘고무의 반복열화에 따른 전기적 특성변화(I))

  • Oh, Tae-Seung;Lee, Chung;Kim, Ki-Yup;Park, Soo-Gil;Ryu, Boo-Hyung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.258-261
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    • 2001
  • In this paper, aging characteristics of silicone rubber used for outdoor insulation have been investigated with regards to salt fog condition and heat aging effect. We look over the change of properties of silicone rubber in salt fog chamber with average leakage current monitoring for observing the transformation of surface degradation properties of silicone rubber with different ATH(alumina trihydrate, $Al_2O_3{\cdot}3H_2O$) filler contents. Surface resistivity, SEM(Scanning Electro Microscope) were measured.

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Correlation between leakage current and temperature Rise for artificially aged insulators (인위적 열화 애자에 대한 누설전류와 온도와의 관계)

  • Kim, J.T.;Kim, J.H.;Koo, J.Y.;Yoon, J.H.;Ham, G.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05c
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    • pp.186-188
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    • 2001
  • In this study, the correlation between leakage currents and temperature rise was investigated for the more accurate diagnosis of bad insulator by use of the infrared camera. For the purpose, leakage currents and thermal images were measured for the artificially aged insulators using salt fog. From the results, it is concluded as follows ; in case of artificially aged insulators, the leakage. current was decreased with the duration of voltage application and was largely affected by humidity, which seems due to ionic conduction. Also, the correlation between temperature rise and leakage current was appeared to be quite linear, although it showed below linearity at large leakage current.

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The Change of Contamination Performance of Polymeric Insulators for Outdoor Use (Salt fog 내에서 옥외용 고분자 절연물의 내오손 성능 변화)

  • 김정호;문중섭;박용판;김동명;원호상
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.505-508
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    • 1999
  • In this study, weight loss, ESDD, surface conductivity and leakage current were measured at the different saline solutions by salt fog method. The magnitude of leakage current was higher at higher conductivity of 2 S/m saline water, but weight loss ESDD and surface conductivity which are indices of degradation were lower. This is considered that the current includes mainly ohmic component which doesn\`t contribute to surface degradation. In addition, it is shown that FFT could be useful in measuring initial transition from hydrophobic to hydrophilic surface.

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The Change of Electrical Properties on Silicone Rubber Contained ATH under Cyclic Aging(I) (ATH를 첨가한 실리콘고무의 반복열화에 따른 전기적 특성변화(I))

  • Oh, Tae-Seung;Lee, Chung;Kim, Ki-Yup;Park, Soo-Gil;Ryu, Boo-Hyung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.258-261
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    • 2001
  • In this paper, aging characteristics of silicone rubber used for outdoor insulation have been investigated with regards to salt fog condition and heat aging effect. We look over the change of properties of silicone rubber in salt fog chamber with average leakage current monitoring for observing the transformation of surface degradation properties of silicone rubber with different ATH(alumina trihydrate, Al$_2$O$_3$$.$3H$_2$O) filler contents. Surface resistivity, SEM(Scanning Electro Microscope) were measured.

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The Properties of Leakage Current of Silicone Rubber wish the Recovery of Hydrophobicity (발수성 회복에 따른 실리콘 고무의 누설전류 특성)

  • 서광석;김정호;문중섭;박용관;양계준;유영식
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.501-504
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    • 1999
  • The polymer insulators which are installed on outdoor have a great advantage than porcelain and 71ass, due to suppression of leakage current, light weight, low cost, etc. It needs variable evaluation methods for application of these insulators on service. The analysis of measuring leakage current is useful for ageing diagnosis because of monitoring in real-time. In this paper, we look over the recovery of hydrophobicity of silicone rubber in mini salt-fog chamber with leakage current monitoring. also, we understand the relation of between hydrophobicity and leakage current and discuss on method of leakage current monitoring.

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Relation between Surface degradation and Anti-pollution Characteristics in RTV Silicone Rubber (RTV 실리콘 고무의 표면열화와 내오손 특성과의 상관관계)

  • 연복희;이태호;허창수;이상엽
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.7
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    • pp.598-606
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    • 2000
  • In this paper we investigated the relation between the surface degradations and anti-pollution characteristics of Room Temperature Vulcanized(RTV) silicone rubber coating that has different roughness through immersing into saline water. We utilized several analytic techniques such as atomic force microscopy(AFM) scaning electron microscopy(SEM) contact angle Salt Deposit Density(SDD) and average leakage current under the condition of salt fog. It is found that the surface roughness of treated RTV silicone rubber increased and the hydrophobicity of sample surface decreased with increasing the duration o immersion into water due to the erosion of base polymer the melting down alumina trihydrate(ATH) and the diffusion of Low Molecular weight(LMW) fluid. Despite the roughness of surface had been increased by water immersion excellant anti-pollution and recovery characteristics were maintained and SDD saturated to 0.1~0.14mg/cm$^2$. The average leakage current under salt fog increased with surface roughness. Measurement of average leakage current will be helpful to investigate surface degradation and lifetime expectation of RTV silicone coating.

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