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首页> 外文期刊>Science, Measurement & Technology, IET >Investigation on Insulation Performance of Thermally Aged Natural Ester Oil Impregnated Pressboard
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Investigation on Insulation Performance of Thermally Aged Natural Ester Oil Impregnated Pressboard

机译：热老化天然酯油浸渍纸板的隔热性能研究

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An attempt is made to understand the effect of thermal ageing on natural ester oil impregnated pressboard material. Surface discharge inception voltage of natural ester oil impregnated pressboard material is reduced drastically under AC, harmonic AC voltages and with DC voltages with high ripple content. Phase-resolved partial discharge studies show an increase in the number of discharges for natural ester oil impregnated pressboard (OIP) aged at higher temperature, under AC and harmonic AC voltages with different total harmonic distortions. Surface potential measurement study complies with results obtained by surface discharge inception voltage. It indicates the presence of high-density charge traps evolved as a function of ageing time and temperature. Laser-induced breakdown spectroscopy analysis is carried out to understand the characteristic variation with thermally aged OIP material. A decrease in plasma temperature is observed for sample aged at higher temperature. Differential scanning calorimetric studies indicate reduction in peak temperature with thermally aged specimens. Ageing observed to affect mechanical strength of the cellulosic material, as indicated by tensile test. Dielectric response spectroscopy study indicates that with an increase in thermal ageing, the permittivity, tan(delta), DC conductivity and relaxation time have increased. A reduction in activation energy of the aged material is observed, which indicates the status of the OIP material.
机译：试图了解热老化对天然酯油浸渍的纸板材料的影响。在交流，谐波交流电压和具有高纹波含量的直流电压下，天然酯油浸渍纸板材料的表面放电起始电压会大大降低。相分辨局部放电研究表明，在具有不同总谐波畸变的AC和谐波AC电压下，高温下老化的天然酯油浸渍压制板（OIP）的放电数量增加了。表面电势测量研究符合通过表面放电起始电压获得的结果。它表明高密度电荷陷阱的存在是随时间和温度而变化的。进行激光诱导击穿光谱分析以了解热老化OIP材料的特性变化。对于在较高温度下老化的样品，观察到等离子体温度降低。差示扫描量热研究表明，热老化试样的峰值温度降低。如拉伸试验所示，观察到老化会影响纤维素材料的机械强度。介电响应谱研究表明，随着热老化的增加，介电常数，tanδ，DC电导率和弛豫时间都增加了。观察到老化材料的活化能降低，这表明了OIP材料的状态。

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