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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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- 2013
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According to People''s life level of domestic is dramatically increasing, reserve margin is recorded lowest value. Nowadays, necessity of high voltage and high capacity is increasing each year. Accident of high power equipment adversely affect with serious economic losses and social disruption in high industrial sociality significantly higher depend on electricity. Therefore, insulation diagnosis in high power equipment is very important.
VLF(Very Low Frequency) tanδ diagnosis technology is introduced in IEEE Std.400. It is proposed as evaluation criterion in an effective way of detecting water tree which mainly causes the failure of XLPE insulated cables. Insulation of high voltage has capacitance and high insulation resistance and several characteristics that phase difference of 90 degree is generated between leakage current and voltage. But this characteristics is only ideal condition and generated a little deviation by resistive. This deviation is called "tanδ" that is highly, impact of resistive of leakage current is higher. These phenomena represent that insulation start to breakdown.
In this paper, VLF tanδ criteria is established in 6 level “Good”, “Concern”, “Caution-1”, “Caution-2”, ”Bad”, “Imminent” through segmentation of 3 level estimation method. This establishment of VLF criteria is based on diagnostic results of MV cable of 3,621km within operational 7,860 D/L that is branch office of Korea Electric Power Corporation conducted during one year in 2011 using a weibull distribution.
VLF(Very Low Frequency) tanδ diagnosis technology is introduced in IEEE Std.400. It is proposed as evaluation criterion in an effective way of detecting water tree which mainly causes the failure of XLPE insulated cables. Insulation of high voltage has capacitance and high insulation resistance and several characteristics that phase difference of 90 degree is generated between leakage current and voltage. But this characteristics is only ideal condition and generated a little deviation by resistive. This deviation is called "tanδ" that is highly, impact of resistive of leakage current is higher. These phenomena represent that insulation start to breakdown.
In this paper, VLF tanδ criteria is established in 6 level “Good”, “Concern”, “Caution-1”, “Caution-2”, ”Bad”, “Imminent” through segmentation of 3 level estimation method. This establishment of VLF criteria is based on diagnostic results of MV cable of 3,621km within operational 7,860 D/L that is branch office of Korea Electric Power Corporation conducted during one year in 2011 using a weibull distribution.
목차
Table List iiiFigure List ivList of Terms and Abbreviations viAbstract viiiI. 서 론 1II. 전력케이블의 열화와 상태진단 이론 42-1. 전력케이블의 열화 메커니즘과 고장 42-2. XLPE 절연체의 수트리(water tree)현상 72-2-1. 수트리(water tree) 72-2-2. 수트리 길이와 밀도에 따른 절연파괴 전압 112-3. VLF tanδ (Very Low Frequency - tanδ) 152-3-1. VLF tanδ 측정원리 152-3-2. VLF tanδ 특성 172-4. IRC(Isothermal Relaxation Current) 측정기술 212-5. OWTS(Oscillating Wave Test System) 측정기술 24III. 진단대상 및 상태진단 방법 263-1. 상태진단 대상 263-2. 상태진단 방법 283-2-1. VLF tanδ 측정방법 28IV. 상태진단결과 및 고찰 344-1. 전력케이블의 VLF tanδ 진단결과 344-1-1. 전력케이블의 VLF tanδ 상태진단 344-1-2. VLF tanδ(1.0Uo, 1.5Uo-0.5Uo) 경향성 분석 404-1-3. VLF tanδ 신 측정인자 도입 454-2. VLF tanδ 신 판정기준 정립 464-2-1. VLF tanδ 신 판정기준 적용 50V. 결 론 60참고 문헌 61
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