The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Study on IPT Characteristics of LSR / Nano Silica Composites for HVDC

HVDC용 LSR/Nano Silica Composites의 IPT특성 연구

  • Park, Jae-Jun (Dept. of Electrical and Electronic Engineering, Kiee University)
  • Received : 2018.10.29
  • Accepted : 2018.12.29
  • Published : 2019.01.01
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Abstract

Only the power is converted from AC to DC, in accordance with IEC 60587 based test method, in order to develop the LSR(Liquid Silicone Rubber) insulator material for HVDC, the experiment of Inclined Plate Tracking and Erosion Resistance was conducted. A contaminant (2.5 mS/cm: ammonium chloride) was applied at a rate of 0.3 ml/min and a voltage of ${\pm}3.5kV$, and was evaluated on the basis of 60 mA/2s. The samples were prepared by dispersing LSR/Nano silica_25wt% Composites in LSR. The erosion phenomena of surface discharge and tracking due to DC polarity and negative polarity were measured by image, leakage current maximum and thermal camera. The thermal imaging camera measured the surface temperature generated by the joule heat of the leakage current due to the drying discharge and the conductive current. After the measurement, the tracking and erosion mechanisms were evaluated for erosion weight, erosion depth and erosion length. Positive and negative polarity of LSR/Nano Silica_25wt% composite Tracking and erosion results show that positive polarity is more severe than negative polarity.

Keywords

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그림 1 트래킹 실험시스템 Fig. 1 Tracking experiment system

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그림 2 실리콘/나노실리카 콤포지트 누설전류 (정극성) Fig. 2 SiR/Nano silica composites leakage current(Positive)

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그림 3 실험시작으로부터 끝까지 정극성 누설전류 값 Fig. 3 Positive leakage current maximum value from start to end of experiment

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그림 4 SiR/Nano Silica 콤포지트 누설전류 최대값 Fig. 4 SiR/Nano silica composites leakage current maximum value (Negative)

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그림 5 실험시작으로부터 끝까지 부극성 누설전류 최대값 Fig. 5 Negative leakage current maximum value from start to end of experiment

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그림 6 정극성 DC(3.5kV), SiR/nano silica composite의 트래킹 및 침식 영상 (a) 27분, (b) 55분, (c) 60분, (d) 320분 Fig. 6 Tracking and erosion imaging of positive DC (3.5 kV), SiR/nano silica composite

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그림 7 부극성 DC(-3.5kV), SiR/nano silica composite의 트래킹 및 침식 영상 (a) 27분, (b) 44분, (c) 71분, (d) 220분 Fig. 7 Tracking and erosion imaging of negative DC (-3.5 kV), SiR/nano silica composite (a) 27min, (b) 44min, (c) 71min, (d) 220min

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그림 8 트래킹 실험 전후 샘플 (b) 정극성 (c) 부극성) Fig. 8 Sample before and after tracking experiment (b) Positive (c) Negative

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그림 9 누설전류 크기와 전류 펄스 수 Fig. 9 Leakage Current Amplitude and Count

표 4 정극성 및 부극성 트래킹 후 침식량 Table 4 Erosion weight of positive and negative polarity after tracking

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표 5 그림 9 누설전류 크기의 분류 Table 5 Classification of leakage current amplitude

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표 6 그림 9의 10mA 이상 누설전류 상세분류 Table 6 Leakage current classification of more than 10 mA in Fig. 9

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References

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