• 조명전기설비학회논문지
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• 제22권4호
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• pp.147-152
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• 2008

본 논문은 코로나 방전에 의한 자기애자와 폴리머애자의 자외선 발생 특성에 관한 것이다. 자외선 카메라를 이용하여 측정하고, KS C IEC 60060-1(2006)의 전압조건을 준수하여 실험하였다. 결과로서 자기애자에서의 코로나 방전은 애자 접합면에서 가장 취약한 부분에서 시작되었다. 폴리머애자는 취약한 접합면에서 자외선이 발생하였으며, 전원 측에서 나타났다. 이로써 자외선 검출을 통해 절연애자의 취약부분이 쉽게 확인되는 것을 알 수 있었다. 또한, 기존의 초음파 검출기술과 비교하여 열화단계가 정량화될 수 있음을 확인하였다. 이는 신뢰성 있는 데이터를 통해 전력설비의 열화를 판단하는 기준에 활용될 수 있다. 향후 현장진단에 적합한 기술로서 앞으로 많은 연구가 기대된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 추계학술대회 논문집
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• pp.319-322
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• 1998

Many researchers make efforts to develop an effective material with anti-degradation property. Specially, the porcelain type insulator is required exchanging to polymer insulator acceding to the environmental consideration In this paper, we have developed the estimation system using the PD testing. The approach of PD has been very successful applied to the various practical insulator.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.973-975
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• 1998

Many researchers make efforts to develop an effective material with anti-degradation property. Specially, the porcelain type insulator is required exchanging to polymer insulator according to the environmental consideration. In this paper, we have developed the estimation system using the PD & SD testing. Those approach has been very successful applied to the various practical insulator.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.218-221
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• 1999

Many researchers make efforts to develope an effective material with anti-tracking property. Specially, the porcelain type insulator is required exchanging to polymer insulator according to the environmental consideration. In this paper, we have developed the estimation system using the translated IEC-60587 test for the application of actual insulator. Those approach has been very successful applied to the various practical insulator.

• Transactions on Electrical and Electronic Materials
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• 제10권5호
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• pp.161-164
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• 2009

Forest fire simulation tests were performed with polymer and porcelain insulators at GOCHANG Power Testing Center. These tests consisted of open flames causing a temperature rise of up to $600{\sim}800^{\circ}C$ measured at the insulator surfaces. Mechanical and electrical characteristics such as the specific mechanical load, the low frequency dry flashover voltage and the impulse flashover voltage were analyzed for the polymer insulators before, during and after the simulation tests and then compared to the porcelain insulators. At the end of the fire simulation tests, there was no detrimental deterioration of any of the insulators. All the insulators passed the KEPCO specification criteria. This study showed that the forest fire simulation had no impact on the polymer insulators.

• 한국전기전자재료학회논문지
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• 제17권10호
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• pp.1132-1141
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• 2004

The waveforms of the leakage currents for the surface discharge according to the degree of salt contamination and the variation of environmental condition on the EPDM polymer insulators, were shown in this paper. The variation phenomena of fundamental wave, 3rd and 5th harmonic waveforms were also shown from the beginning of the applied voltage and to the flashover voltage. To develop the technique of percentage contamination degree of EPDM polymer insulator according to the variation of environmental condition, the distortion degree of 3rd and 5th harmonic wave to the fundamental wave was utilized through the spectrum analysis for the waveforms of leakage current in the simulation of salt and fog test. The fact that distortion degree % of 3rd and 5th harmonics for fundamental wave is a necessary indicator for the assessment of contamination degree for the polymer insulators, was known.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.371-377
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• 2009

The use of polymer insulator has increased all over the world. As of 2000's KEPCO has used it fully since they introduced it in early 1990's. In Korea it is very widely used by KORAIL which uses AC 25 kV system in the ground electric car line. And It is also used in tunnel electric car line to support AT feeder line. But it has not been used in the section of DC 1500 V. In case of DC 1500 V electric railway system It is has been developed by research institutes by means of R&D projects since 2008. The user cleans porcelain insulators regularly by water because of dusts and pollution. In case of polymer insulators It is very easy to be made dirty by pollution because of the material properties and hard to be cleaned by cleansing. In accordance with these reasons It is worried about deterioration. This paper deals with anticipating problems when we apply it to DC electric railway system and the procedure for testing polymer support insulator.

• Transactions on Electrical and Electronic Materials
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• 제7권6호
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• pp.283-292
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• 2006

So that high-strength and electrical properties apply by excellent high voltage insulator electricity material, ATH content and platinum-based flame retardant that influence in flame retardant and tracking characteristic among composite of silicone rubber studied mechanical strength and influence getting to electrical properties. Composition of ${\alpha}$, ${\omega}-vinyl$ poly (dimethyl-methylphenyl) siloxane(VPMPS) of a polymer quantity made doing mole of D4, $D3^{Me,Ph}$ and VMS by 1000:15:0.2 mole ratio and uses basic catalyst tetramethylammonium silanolate(TMAS) and do opening equilibrium polymerization to be used to main polymer for high voltage insulation insulator. Control ATH content and content of platinum-based flame retardant and made high voltage insulation silicone rubber. Measured mechanical strength of making silicone rubber using UTM, and tracking characteristic according to standard of IEC 60587, flame retardant test studied effect that flame retardant characteristic gets in tracking characteristic, measuring according to UL94V method of test.

• Journal of Electrical Engineering and Technology
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• 제4권1호
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• pp.118-122
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• 2009

Organic thin film transistors with a pentacene active layer and various polymer gate insulators were fabricated and their performances were investigated. Characteristics of pentacene thin film transistors on different polymer substrates were investigated using an atomic force microscope (AFM) and x-ray diffraction (XRD). The pentacene thin films were deposited by thermal evaporation on the gate insulators of various polymers. Hexamethyldisilazane (HMDS), polyvinyl acetate (PVA) and polymethyl methacrylate (PMMA) were fabricated as the gate insulator where a pentacene layer was deposited at 40, 55, 70, 85, 100 oC. Pentacene thin films on PMMA showed the largest grain size and least trap concentration. In addition, pentacene TFTs of top-contact geometry are compared with PMMA and $SiO_2$ as gate insulators, respectively. We also fabricated pentacene TFT with Poly (3, 4-ethylenedioxythiophene)-Polysturene Sulfonate (PEDOT:PSS) electrode by inkjet printing method. The physical and electrical characteristics of each gate insulator were tested and analyzed by AFM and I-V measurement. It was found that the performance of TFT was mainly determined by morphology of pentacene rather than the physical or chemical structure of the polymer gate insulator

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 전기설비전문위원
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• pp.313-314
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• 2009

In this paper, it's described the UV detected images on polymer insulators using UV camera. The patterns of UV detected images are classified into 3 types such as jellyfish(J), amoeba(A), sunflower(S). J type is detected by high electric field in air A type is detected by early surface discharge. And, S type is detected by the serious problem in surface of insulator.