• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.14-15
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• 2006

제조공정상에서 발생하는 공정 변수에 의한 제품의 수준별 제품에 대하여 인가 전압별 절연저항 측정 및 내전압 측정 결과 내전압이 낮은 제품군에서 절연저항이 낮게 나타났으며 산포도 크게 나타남을 확인 할 수 있었다. PCT 시험 후의 유전 특성은 경우 용량의 변화율은 상승한 반면 제품군에 따른 용량 변화율의 크기는 작은 반면에 유전손실의 경우 PCT 실험후 변화율이 크게 나왔으며 이와같은 결과는 신뢰성 측면에서 취약할 수 있음을 보여주고 있다.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.9 no.5
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• pp.12-21
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• 1995

• Electric Engineers Magazine
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• s.330
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• pp.22-23
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• 2010

• Electric Engineers Magazine
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• s.328
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• pp.26-32
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• 2009

• The Safety technology
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• no.110
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• pp.68-70
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• 2007

• Journal of Sensor Science and Technology
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• v.10 no.1
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• pp.24-32
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• 2001

High temperature platinum resistance thermometers(HTPRTs) were designed and fabricated using a synthetic sapphire single crystal as sensor former, insulation and protection tube, and its characteristics was investigated. Several fixed points measurement showed that the sapphire HTPRTs were satisfied with the ITS-90 criteria as the interpolating thermometer. The temperature-resistance characteristics of HTPRT was fitted to the quadratic relationship in the temperature range from $500^{\circ}C$ to $1500^{\circ}C$. The reproducibility of Cu freezing point realized using the sapphire HTPRT was ${\pm}19.2\;mK$. The insulation resistance of the HTPRT exponentially decreased as temperature increased, and showed to $63\;k{\Omega}({\sim}31.5\;mK)$ at $1500^{\circ}C$.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.424.1-424.1
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• 2016

태양전지 모듈의 봉지재로 사용되는 EVA(Ethylene-Vinyl acetate)는 외부의 환경으로부터 태양전지를 보호해주는 역할을 한다. 하지만 frame의 실링재나 glass edge 부분의 결함으로 인해 수분이 침투되어 모듈의 내부자재에 영향을 미치게 되며, 모듈의 효율 감소나 수명 단축의 원인이 된다. 이러한 결함을 줄이기 위해서는 EVA의 crosslinking degree, 절연 저항 특성을 향상시키는 것이 중요하다. 이에 본 연구에서는 EVA의 crosslinking degree를 보기 위해 soxhlet extraction method를 이용하여 gel content를 측정하였으며, 라미네이션 과정 중 curing time에 따른 gel content 변화를 확인하였다. 또한 이 실험을 바탕으로 gel content에 따른 절연 저항을 측정하여 EVA의 crosslinking degree에 의한 절연 저항 특성을 확인하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.5
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• pp.237-242
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• 2014

In this paper, we find out the lifetime index in order to determine the time-dependent trend of deteriorating performance of 6.6kV high-voltage power cable in operation at a power station. The cable systems used in our study have been in operation for 13 years. With measurements for the 13 years, we analyzed the insulation resistances. By developing measuring equipment (comprized mainly of transformer, temperature sensor, and LPF) operating by the three-phase electric power, we analyzed the changing characteristics of insulation resistance of power cable. In contrast to 22kV cables, 6.6 kV cables have thicker insulation. Therefore the characteristics of 6.6kV cables are different from that of 22kV cables. The study found that as time passes, the insulation resistance does not decrease continuously; it decreases to a certain value, then does not decrease any more and shows properties of oscillation. We could not detect the process of deterioration in the preceding twelve years. The cable system showed great stability so that deterioration was not apparent. In this case, it is not possible to measure the future life indices of power cables because the lifetime indices are not predictable

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.5
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• pp.111-116
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• 2022

The causes of motor burnout include overload, phase loss, restraint, interlayer short circuit, winding ground fault, instantaneous overvoltage, and the rotor contacting the stator, leading to insulation breakdown, leading to breakdown or electrical accidents. Therefore, equipment failure causes not only loss due to cost required for equipment maintenance/repair, but also huge economic loss due to productivity decrease due to process stop because the process itself including the motor is stopped. The current level of technology for diagnosing motor failures uses vibration, heat, and power analysis methods, but there is a limit to analyzing the problems only after a considerable amount of time has passed according to the failure. Therefore, in this paper, a device and algorithm for measuring insulation resistance using DC AMP signal was applied to an industrial motor to solve this problem. And by following the insulation resistance state value, we propose a diagnosis of deterioration and failure of the motor that cannot be solved by the existing method.

• 전기의세계
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• v.25 no.6
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• pp.31-35
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• 1976

절연저항유도율 및 손실 절연파괴강도등의 정확한 과학적인 이해없이는 절연재료의 비약적인 발전은 있을 수 없다. 고전적인 물리학에서는 불가능했던 이 이해가 양자역학에 의거한 근대물성론에 의해 가능해졌고 물질의 성질을 그 구성원자의 종류와 배열에서 이론적으로 도출할 수 있게 되었다. 금후, 전기재료의 사용개발에 관여하는 기술자는 반드시 이와 같은 새로운 원자이론적인 방법을 master하지 않으면 안된다. 앞으로의 이 해설이 절연물의 전기적 성질을 매개로서 다소나마 새로운 원자론적인 사색법의 보급에 유익하게 되면 하는 것이 필자가 바라는 의도인 것이다.