• 한국전기전자재료학회논문지
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• 제34권1호
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• pp.16-20
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• 2021

In this study, we tried finding new materials to improve the stain resistance properties of polymer insulating materials. Using the filtered vacuum arc source (FVAS) with a graphite target source, DLC thin films were deposited on silicon and polymer insulator substrates depending on their thickness to confirm the surface properties, physical properties, and structural properties of the thin films. Subsequently, the possibility of using a DLC thin film as a protective coating material for polymer insulators was confirmed. DLC thin films manufactured in accordance with the thickness of various thin films exhibited a very smooth and uniform surface. As the thin film thickness increased, the surface roughness value decreased and the contact angle value increased. In addition, the elastic modulus and hardness of the DLC thin film slightly increased, and the maximum values of elastic modulus and hardness were 214.5 GPa and 19.8 GPa, respectively. In addition, the DLC thin film showed a very low leakage current value, thereby exhibiting electrical insulation properties.

• 한국산학기술학회논문지
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• 제14권7호
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• pp.3437-3443
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• 2013

고분자 절연재료는 기존의 세라믹 절연재료에 대체되는 물질로 매년 수요가 꾸준히 급증하고 있다. 그러나, 실용에 있어 장시간 외부로부터 가해지는 열화인자에 노출됨에 따라 경시적 성능저하 및 수명단축이 발생되고, 이를 근본적으로 해결하기 위한 고분자 열화메커니즘의 규명이 안전성 향상 및 신뢰성 확보를 위해 중요한 과제로 대두되고 있다. 본 연구는 이러한 열화발생 및 진행경로를 해석하기 위한 일환으로 열, 수분에 의한 열화를 각각 임의로 모의하여, 열화 발생메커니즘을 해석하였다. 특히, 본 연구에서는 화학적 측면의 특성분석을 수행하였고, 이를 통해 표면의 친수 소수적 분자구조 분석으로 최종적인 표면열화 모델링을 도출하였다. PCB 기판용 고분자 복합재료를 대상으로 열, 수분 가속열화에 따른 표면에서의 접촉각, XPS 분석을 통해 표면의 변화 메커니즘을 분석하였다. 친수화 경향을 나타내는 표면은 접촉각의 감소와 carboxyl($-COO^*$) 라디칼이 다량 발생하였으며, 소수화 경향을 나타내는 표면은 접촉각의 증가와 표면에서 산소기의 이탈과 탄소결합의 불포화 이중결합화로 안정된 화학구조를 구성하고 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1490-1492
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• 2001

Recently polymer composite materials has been replacing the porcelain in suspension insulators as a insulating material. The polymer composite materials are introduced into Korea from the abroad, so there is, actually, no formal standard of assessment Both the porcelain insulator specifications and composite material test specifications are being used at the same time. The aim of this project is to establish a systematic standard suitable to current situations considering the trends of its production within Korea. This would protect the inner-markets against the market-opening and would promote the industrial development within a country.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.1100-1103
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• 2004

The paper presents the results of using the fundamental and the low frequency harmonic components of leakage current to study aging of EPDM insulator for contaminated condition by kaolin. The largeer the leakage current during 200ms, the higher harmonic component at 60hz. The harmonic component at 60hz and the odd order harmonics is increase relation without Kaolin Conent. Arcing on the surface was always associated with distortion in the leakage current; hence the low frequency components of the leakage currnent can be used as a means to evaluate the surface degration. Both the fundamental and 3rd & 5th harmonics increase dry-band activity.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1791-1793
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• 1996

This paper describes Thermal-Mechanical performance and Ultimate Mechanical-Strength test for the purpose of aging analysis of suspension insulator. The temperature difference of insulator surface according to the aging of suspension insulator brought out about $2^{\circ}C$ to $7-8^{\circ}C$ difference comparing with the atmospheric temperature. Quality standard and Mechanical-Strength of used suspension insulator deteriorate more remarkably than that of new suspension insulator. It is required that Thermal-Mechanical performance test standard be revised in the future. And it is described about the development prospect of polymer insulators

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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• pp.199-202
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• 1998

In examining application of polymer as electrical insulators, it is very important to perform accelerated aging test substituted the process which polymer insulator is degraded for long-time by the process of short-time. The purpose of this paper is to examine the properties of water degradation which affect on the efficiency of epoxy insulator. To do this, the surface properties on epoxy insulating material have been investigated after long-time accelerated degradation in boiling water condition. The experimental results showed the contact angle and surface resistivity after treatment to decrease the sample of water treatment. In dielectric properties, dielectric constant was increased by the aging development with water treatments.

• 한국고분자학회지:고분자과학과기술
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• 제2권3호
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• pp.158-168
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• 1991

본고에서는 고분자절연체의 내부전하분포 측정을 위한 측정원리, 측정장치 및 실제측정예 등에 대하여 언급하였다. 이 방법은 고분자내에 존재하는 전하의 종류, 위치 및 전하량에 대한 정보를 얻을 수 있으므로 고분자의 절연성질을 이해하는데 도움을 줄 것으로 생각한다. 특히 폴리에틸렌의 경우 여러 가지 요인, 즉 수지의 종류 또는 첨가제의 유무 등에 의해 각기 다른 내부전하분포를 갖는다는 사실이 밝혀졌다. 이와 같은 사실은 고분자 내부에 존재하는 공간 전하 때문에 외부전압에 의한 전기장이 변형되고 이에 따라 고분자의 절연성질이 변형될 수 있다는 점을 생각할 때 매우 중요한 의미를 갖는다고 할 수 있다. 따라서 고분자의 절연성질에 대한 이해를 높이기 위하여는 절연성질과 내부전하분포와의 관계에 대한 보다 깊은 연구가 이루어져야 할 것으로 생각된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 춘계학술대회 논문집 방전 플라즈마 유기절연재료 초전도 자성체연구회
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• pp.76-81
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• 2004

This paper presents the results of spectral analysis of leakage current waveforms on contaminated insulators under various fog and environment conditions(salt fog, clean fog, rain) The larger the leakage current during 200ms, the higer the power spectrum at 60Hz. For almost equal maximum current during 200ms, however, the spectrum at 60hz and the odd order harmonics increase emphatically when discharges occur continuously for several half-waves. If contaminated insulators suffers from high salt-density fog, the leakage current occurs with high crest value intermittently, results in the low spectrum. Analysis of leakage current data showed that this electrical activity was characterized by transient arcing behavior contaminants are deposited on the insulator surface during salt fog tests. This provides a path for the leakage current to flow along the surface of the insulator. It is important to have an indication of the pollution accumulation in order to evulate the test performance of a particular insulator. If the drop in surface resistivity is severe enough, then the leakage current may escalate into s service interrupting flashover that degrade power quality.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 춘계학술대회 논문집 방전 플라즈마 유기절연재료 초전도 자성체연구회
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• pp.25-29
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• 2004

Corona on polymer materials causes deterioration by the combined action of the discharge striking the surface and the action of certain chemical compounds that are formed by the discharges. In the design and manufacture of polymer insulators must be sufficiently large to avoid corona discharges, otherwise a shielding or corona ring (grading ring) needs to be installed on the insulator. To conduct this purpose, many researchers have investigated end-fitting of polymer insulator by voltage distribution simulation and electrical test. Grading rings are used to improve the performance of the insulator in multiple ways. They can reduce corona and associated audible noise and radio influence and television interference. The factors determining the uses of a grading ring are line voltage, geometry and dimensions of end fittings, geometry and dimensions of line hardware, and environmental conditions. In this paper, electrical property of polymer insulator with end-fitting design have been investigated by electrical field analysis, various end-fitting design, tracking wheel test, corona inception voltage and extinction voltage. Electrical field analysis is conducted by FEM program and various end-fitting is designed through this result. Designed end-fittings are manufactured and their performance is conducted by electrical performance test.

• 한국전기전자재료학회논문지
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• 제30권10호
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• pp.665-671
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• 2017

Herein, we report the fabrication of low-voltage N-type organic field-effect transistors by using high capacitance fluorinated polymer gate dielectrics such as P(VDF-TrFE), P(VDF-TrFE-CTFE), and P(VDF-TrFE-CFE). Electron-withdrawing functional groups in PVDF-based polymers typically cause the depletion of negative charge carriers and a high contact resistance in N-channel organic semiconductors. Therefore, we incorporated intermediate layers of a low-k polymerto prevent the formation of a direct interface between PVDF-based gate insulators and the semiconducting active layer. Consequently, electron depletion is inhibited, and the high charge resistance between the semiconductor and source/drain electrodes is remarkably improved by the in corporation of solution-processed charge injection layers.