This paper describes the electrical characteristics of Nomex paper employed as an insulating material of distribution transformers. The relative permittivities(dielectric constants) and $tan{\delta}$(dielectric dissipation factors) were measured as a dielectric characteristic and the part...
This paper describes the electrical characteristics of Nomex paper employed as an insulating material of distribution transformers. The relative permittivities(dielectric constants) and $tan{\delta}$(dielectric dissipation factors) were measured as a dielectric characteristic and the partial discharge inception voltages(PDIVs) and breakdown voltages were also measured as an electrical strength characteristic of Nomex paper. As a result, the permittivity and $tan{\delta}$ of Nomex paper showed temperature and frequency dependency. Especially, the permittivity of 0.18mm Nomex paper was 2.4 according to the ASTM condition. And the PDIVs and breakdown voltages were, almost linearly increased with the thickness of Nomex paper and its electrical strength was better than conventional kraft paper.
This paper describes the electrical characteristics of Nomex paper employed as an insulating material of distribution transformers. The relative permittivities(dielectric constants) and $tan{\delta}$(dielectric dissipation factors) were measured as a dielectric characteristic and the partial discharge inception voltages(PDIVs) and breakdown voltages were also measured as an electrical strength characteristic of Nomex paper. As a result, the permittivity and $tan{\delta}$ of Nomex paper showed temperature and frequency dependency. Especially, the permittivity of 0.18mm Nomex paper was 2.4 according to the ASTM condition. And the PDIVs and breakdown voltages were, almost linearly increased with the thickness of Nomex paper and its electrical strength was better than conventional kraft paper.
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가설 설정
(1)The permittivity of Nomex paper was increased with temperature and decreased with frequency. Especially, the permittivity of 0.
대상 데이터
This specimen set was arranged on the lower plain stainless Rogowski electrode of 75mm in diameter and edge-rounded by 3mm in radius. The upper plain ~ stainless Rogowski electrode(about 600g) of 25mm in diameter and edge-rounded by 2.5mm in radius was put on the Nomex paper. And then the upper electrode was impregnated in silicone oil.
And the bottom surface of Nomex paper was painted with silver paste. This specimen set was arranged on the lower plain stainless Rogowski electrode of 75mm in diameter and edge-rounded by 3mm in radius. The upper plain ~ stainless Rogowski electrode(about 600g) of 25mm in diameter and edge-rounded by 2.
성능/효과
(2)Dielectric dispersion that the permittivity outstandingly varies was observed in the range of high temperature over 220G low frequency below 100Hz.
(3) Nomex paperzs tan 5 generally tended to be increased with temperature and to be decreased with frequency. And the tan 3 curve in the low frequency range is shifted to the lower temperature region.
(4) The partial discharge of 0.13mm thick Nomex paper was first observed at L7아由球也 and the increasing rate with thickness was about 2.375 kV/ram. In addition, the breakdown voltage of Nomex paper was 3.
후속연구
It was not easy to get aged Nomex paper because it has recently introduced into transformers. Therefore, further studies on the aged specimen are required.
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