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The dielectric properties of transformer oil are greatly threatened by particles especially the metallic particles. In order to obtain the influence of metallic particles on frequency domain spectroscopy (FDS) of mineral oil, we chose copper particles to contaminate the mineral oil artificially. The dielectric properties such as relative permittivity, dielectric loss tangent and volume resistivity...
The vegetable insulating oil is applied increasingly as dielectric liquid in transformers, but it is vulnerable to particles especially the metallic particles. In this paper, focus is made on the influence of metallic particles such as copper and iron particles on the breakdown strengths of vegetable insulating oil. The relationship of AC breakdown strengths and the metallic particle concentration...
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