油纸界面处的沿面放电是油浸式变压器最为常见的局部放电形式之一.为了提高变压器油纸介质的界面绝缘强度,利用TiO2纳米粒子对变压器油浸纸板进行改性研究.分别测量了干燥条件和潮湿条件下纳米改性前后油浸纸板的沿面放电起始电压(SDIV)和沿面闪络电压(CFV),发现干燥纸板条件下TiO2纳米改性油浸纸板的SDIV和CFV是纯变压器油浸纸板的1.12倍和1.15倍.当纸板中的水分增加至4%时,油浸纸板的界面绝缘强度明显降低,但是TiO2纳米改性油浸纸板的SDIV和CFV是纯油浸纸板的1.24倍和1.11倍以上.结果表明:TiO2纳米粒子能够明显抑制油浸纸板,特别是高湿条件下油浸纸板沿面放电的产生和发展,提高油纸绝缘界面的绝缘强度.
Surface discharge at the interface of oil-paper is one of the common discharge phenomena inside oil-immersed transformers. In order to improve the interfacial electric strength of oil-paper in transformer, TiO2 nanoparticles modified transformer oil(nanofluid) was used to impregnate the pressboards. The surface discharge inception voltage (SDIV) and creeping flashover voltage (CFV) of the oil impregnated pressboards before and after nanoparticle modification were measured respectively under different moisture contents. It is found that the SDIV and CFV of the TiO2 nanofluid impregnated press-board with low moisture content are 1.12 and 1.15 times higher than that of the pure oil impregnated pressboard separately. When the moisture content increases to 4%, the interfacial electric strength of oil impregnated pressboards decrease obviously, but the SDIV and CFV of the nanofluid impregnated press-board were still 1.24 and 1.11 times higher than that of the oil impregnated pressboard. The results show that the TiO2 nanoparticles can restrain the produce and develop of surface discharge of oil impregnated pressboards especially the pressboards are damped, and enhance the interfacial electric strength of oil/pressboard insulation.
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