TiO<sub>2</sub>纳米粒子对高水分变压器油中电荷输运的影响

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Abstract Moisture plays a key role in determining the insulating properties of transformer oil in service. In order to improve the insulating properties of transformer oil with high moisture content,TiO₂ semiconducting nanoparticle was used to modify the transformer oil. Breakdown voltage and partial discharge(PD) characteristics of both oil samples before and after modification were measured with different moisture content. It was found that TiO₂ nanoparticles can increase AC breakdown voltage of nanofluids up to 2 times compared with pure oil with high moisture content. In addition,the PD characteristic of the nanofluids was also dramatically improved. Charge accumulation and decay characteristics in pure oil and nanofluids were measured by pulse electroacoustic technique(PEA). It reveals that with high moisture content the nanofluids have higher charge decay rate and more uniform internal electric fields resulting in the better dielectric properties.

Key words： TiO2 nanoparticle transformer oil high moisture content breakdown voltage charge transport pulse electroacoustic technique

Received: 02 November 2012 Published: 22 January 2015

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TM835

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