TY - JOUR
T1 - Frequency dependence of breakdown performance of XLPE with different artificial defects
AU - Li, Weiwei
AU - Li, Jianying
AU - Yin, Guilai
AU - Li, Shengtao
AU - Zhao, Jiankang
AU - Ouyang, Benhong
AU - Ohki, Yoshimichi
N1 - Funding Information:
The authors would thank Mr. Wang Xueyi for his technical support. This work was supported by National Natural Science Foundation of China (Grant No. 50977071) and the Science and Technology Project of State Grid Corporation of China (Grant No. SG0866).
PY - 2012
Y1 - 2012
N2 - In this paper, the effect of the applied field frequency on the breakdown performances of cross-linked polyethylene (XLPE) insulation was investigated. Three kinds of artificial defects, namely an inserted needle, a needle void and a knife void, were introduced into a 10 kV commercial XLPE cable, to simulate real defects that may be introduced during on-site service. Breakdown tests were conducted in transformer oil at room temperature using a frequency-tuned resonant test system in a frequency range from 20 to 300 Hz. It was found that the breakdown voltage of specimens with the inserted needle was sensitive to the applied field frequency, and the breakdown voltage showed a maximum value at about 240 Hz. However, for other two kinds of specimens with the needle void and knife void, the breakdown behavior shows a weak relation with the applied field frequency. The breakdown voltages of the specimens with the needle and void are 25 kV and 20 kV respectively. It was further found that side channels appeared on the flank of the main channel of the breakdown path in the specimen with the inserted needle, and the frequency dependence of fractal dimension D of the side channel in the breakdown path are similar to that of electrical trees before breakdown, which may consequently lead to the maximum value in the experimental results.
AB - In this paper, the effect of the applied field frequency on the breakdown performances of cross-linked polyethylene (XLPE) insulation was investigated. Three kinds of artificial defects, namely an inserted needle, a needle void and a knife void, were introduced into a 10 kV commercial XLPE cable, to simulate real defects that may be introduced during on-site service. Breakdown tests were conducted in transformer oil at room temperature using a frequency-tuned resonant test system in a frequency range from 20 to 300 Hz. It was found that the breakdown voltage of specimens with the inserted needle was sensitive to the applied field frequency, and the breakdown voltage showed a maximum value at about 240 Hz. However, for other two kinds of specimens with the needle void and knife void, the breakdown behavior shows a weak relation with the applied field frequency. The breakdown voltages of the specimens with the needle and void are 25 kV and 20 kV respectively. It was further found that side channels appeared on the flank of the main channel of the breakdown path in the specimen with the inserted needle, and the frequency dependence of fractal dimension D of the side channel in the breakdown path are similar to that of electrical trees before breakdown, which may consequently lead to the maximum value in the experimental results.
KW - Cross-linked polyethylene
KW - breakdown performance
KW - fractal dimension
KW - frequency-tuned resonant systems
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U2 - 10.1109/TDEI.2012.6260011
DO - 10.1109/TDEI.2012.6260011
M3 - Article
AN - SCOPUS:84864960132
SN - 1070-9878
VL - 19
SP - 1351
EP - 1359
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
IS - 4
M1 - 6260011
ER -