Study on breakdown characteristics of nano-modified transformer oil at low temperature

Qin, Chunxu; Yunpeng, Xue; Shang, Jiafeng; Che, Chuanqiang; Liu, Liqiang

doi:10.1016/j.egyr.2023.05.205

Cited by 1 publication

(1 citation statement)

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“…An improvement in the breakdown strength of oil-paper insulation after DC preloading due to the weakening of the applied field strength caused by homopolar charges. An investigation on the breakdown characteristics of nano-modified transformer oil at low temperatures revealed that the incorporation of nano-materials reduces the dispersion of oil breakdown voltage [4]. Zhang et al investigated the dielectric properties of transformer oil and paperboard over a temperature range from -40°C to +100°C, noting that lowering the temperature can increase the resistivity of transformer oil and oil-impregnated paperboard while decreasing the relative permittivity of paperboard [5].…”

Section: Introductionmentioning

confidence: 99%

AC-DC breakdown characteristics of oil-paper insulation at low temperature

Zhang,

Han,

Hao

2024

J. Phys.: Conf. Ser.

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New energy sources such as wind energy are mainly distributed in low temperature areas such as high altitude and high dimensionality in inland China, which has higher requirements for the low-temperature insulation characteristics of power equipment. This poses higher demands for the low-temperature insulation capabilities of power equipment. However, the existing research on the low temperature breakdown characteristics of oil-impregnated paper is limited. In this study, the authors constructed an AC-DC combined power supply and a specialized low-temperature breakdown testing platform. Various oil-impregnated paper samples with different moisture contents were prepared. The paper investigated the AC-DC breakdown characteristics of these samples under low-temperature conditions, focusing on the effects of temperature, moisture content, and DC component on the breakdown strength. The findings serve as a valuable design reference for the application of oil-impregnated power equipment in low-temperature environments.

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Section: Introductionmentioning

confidence: 99%