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The use of polymer nanocomposites - a material system composed of nanometer-sized fillers (nanofillers) homogeneously dispersed in polymers - is predicted to be capable of enhancing the performance of electrical insulation systems without compromising the thermal, mechanical and economic requirements. This is believed to be related to the much smaller size of the fillers, which subsequently leads...
In case of medium voltage cables, the main cause of the insulation breakdown is water treeing by referring to the report of national power utility of Malaysia, Tenaga Nasional Berhad (TNB). The inconsistent and unreliable nature brings out the importance of research towards water tree detection of polymeric insulating cable. Early detection of water tree in underground polymeric cable is important...
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...
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...
Polymers are widely used as insulation material because of their good insulation, physical and chemical properties. Nevertheless, electrification and degradation process due to partial discharge such as surface discharge usually occur and affects the life time of the insulation. The surface discharge can occur due to presence of high voltage stress which can lead to permanent insulation failure after...
Water treeing is a well known phenomenon in polymeric cables, where it plays an important role in insulation ageing and degradation process of the material. Water treeing had been investigated for three decades and the level of investigation of water treeing field on electrical insulation has grown considerably especially in polymeric power cable. One of the polymeric insulation materials, named crosslink...
This paper presents investigation on the propagation of electrical treeing in silicone rubber samples filled with Montmorillonite (MMT) and Organo-montmorillonite (OMMT) nanoclays as fillers for electrical tree inihibition. Treeing experiments were conducted by applying ac voltage with increasing rate of 0.5 kV per second at power frequency on pure silicone rubber, silicone rubber filled with 1% MMT...
Epoxy resin is a kind of polymer which has advantages such as good thermal characteristics, excellent adhesion, good water repellent and resistance to pollution. During operation, field enhancement sites such as in void and protrusion may exist within the polymeric insulation. Degradation of the insulation may start from these parts and electrical treeing will grow. The appearance of an electrical...
Weibull distribution has been used widely by many researches around the world especially in the analysis of high voltage experimental data. Unfortunately, most of the experimental data analysis was not following the accurate statistical technique. Thus in this paper, a statistical study on the tree inception voltage of silicone rubber and epoxy resin is presented. The tree inception voltage of silicone...
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