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- W2782550394 abstract "Oil-impregnated paper (OIP) insulation is a widely used insulating material in power transformer, and the insulation structure is often subjected to repeated impulses. Conventional research mainly focuses on the electrical accumulative effect of repeated impulses on the insulation. However, based on our study, only the electrical accumulative effect of the transient impulse is hardly to induce the winding breakdown. As transformer winding may be deformed by short circuit impulse, and the deformed transformer winding causes OIP damaged. Thus, in this paper, we studied the relationship between breakdown voltages and numbers of impulse voltage applied on the deformed Continuously Transposed Conductor (CTC). The test results confirmed mechanical stress which induces the winding deformation is the main cause of abrupt insulation accident in power transformer. When OIP was damaged 8 layers, the V <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>50</sub> of CTC under lighting and switching impulse were reduced by 41.5% and 40.9% relative to undamaged OIP. And the V <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>50</sub> of all paper damaged CTC under lighting and switching impulse were 83.3% and 82.9% lower than that of undamaged OIP." @default.
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- W2782550394 date "2017-10-01" @default.
- W2782550394 modified "2023-10-16" @default.
- W2782550394 title "Insulation characteristics of deformed transformer winding under transient impulse" @default.
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- W2782550394 doi "https://doi.org/10.1109/ceidp.2017.8257550" @default.
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