Indigenous Manufacture and Characterization of Electrical Porcelain Insulator
In power systems, there is an ever-increasing demand placed on porcelain insulators especially for outdoor applications. Additionally, the huge cost of importation has resulted in a growing need for the local manufacture. To this end, an electrical porcelain insulator was manufactured from locally available raw materials and characterized. The study investigates a porcelain type percentage composition of kaolin, 30; ball clay, 10;feldspar, 22 and quartz, 38. The sample was manufactured by the dry process technique. The pulverized and thoroughly mixed composition was compacted at a pressure of 2 X 108 N/m2 and fired at a temperature of 1355oC with a soaking time of 3 hours for proper sintering. The results of the characterization show that the sample has a volume resistivity of 1.97 X 109 ohm cm, breakdown voltage of 26kV/mm, zero water absorption and dielectric constant between 9.2 and 10.8 within the frequency range considered. These results when compared with those of the commercial variety show that the locally manufactured sample satisfies the stringent requirements of a good insulating material.