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This paper investigates the effect of SRR slot on a monopole antenna with hybrid substrates. The antenna has been investigated by varying the position and the number of SRR slot. The antenna is designed by using a hybrid material substrate constructed by material FR4 and RO3006. The dielectric constant and thickness of both materials are 4.4 and 1.6mm respectively for the former as well as 6.15 and...
Electrical tree is recognized as one of the pre-breakdown phenomena that occurs in high voltage insulation material. In addition, under high divergent field, the electrical tree grows rapidly and severely which may cause the breakdown of insulation to occur. In view of foregoing, nano-filler was added into the base insulating materials to enhance their properties against the growth of electrical tree...
Phase resolved partial discharge (PD) data have been recorded from electrical trees grown in a flexible epoxy resin, a silicone gel and a silicone rubber with and without a nanofiller. The epoxy resin samples and silicone gel samples did not contain any filler particles. In the case of silicone rubber, organo-Montmorillonite (oMMT) nanofiller, was used. The electrical treeing experiments were carried...
Electrical tree initiation voltage and tree propagation length for unfilled silicone rubber, silicone rubber nanocomposites filled with 1% and 3% of OMMT and SiO2 was presented in this paper. This study investigates the capabilities of OMMT and SiO2 in silicone rubber in order to inhibit the growth of electrical treeing. From the result of this study has indicated that in the filled nanocomposite...
This paper describes a set of experiments to assess temperature dependence on phase-resolved partial discharge activity during electrical tree growth in a room temperature vulcanized silicone rubber/organo-Montmorillonite (oMMT) nanocomposite material. The filler particles were prepared by treating MMT with alkylammonium before dispersing in the silicone rubber to form the silicone/organo-Montmorillonite...
This paper reports an investigation carried out in the laboratory on units of transmission line glass insulator samples using Dielectric Dissipation Factor (DDF) Test. Two groups of insulator samples were used in the study. The first group comprised of naturally field-aged insulators with different ageing periods→30, 20, 15, and >;10 years from a 132 kV transmission line which have exhibited different...
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