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In this paper, focus is made on partial discharge (PD) activity in oil-impregnated pressboard used in converter transformers. Voltages over the main insulation of the valve-side windings of the converter transformer were analyzed using the PSIM software. Next, transformer defects were simulated by insulation models to generate PD signals. The dependence of PD inception voltage (PDIV) on the AC plus...
Investigations during the last decade have shown that conductive nanoparticles can be dispersed in transformer oils to form nanofluids. Well-dispersed nanoparticles are capable of increasing the breakdown voltage of the oil under power frequency and lightning impulses. They also increase the inception voltages for partial discharge [1]. With increasing moisture content, reduction of the breakdown...
Abatement of gaseous toluene via alterable frequency dielectric barrier discharge (DBD) plasma in a coaxial cylindrical reactor was carried out at atmospheric pressure and room temperature. During plasma processing to decompose toluene, discharge power was analyzed by using the Q-V Lissajous diagram. It suggested that, the specific energy density (SED) increased with the increasing of applied voltage...
Insulating vegetable oils are fire-resistant and environment-friendly liquid dielectrics. This paper presents a type of nano-modified insulating vegetable oil. The nano-modified insulating vegetable oil was prepared by homogeneous precipitation deposition of ferroferric oxide nano-particles. It was characterized by a laser nano-particle size analyzer. Its electric properties, including AC breakdown...
This paper presents basic dielectric properties of a type of insulating rapeseed oil, including its breakdown voltage, relative permittivity, and dissipation factor. Inception voltages of partial discharges (PD) occurring in this type of insulating rapeseed oils are also presented. PDs in insulating rapeseed oils are not only detected by the pulse current method recommended by IEC 270, but also observed...
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