Mica Filler Effect on Electrical Characteristics of Polymer Insulators

Research Area: Volume 5,Issue 2, March 2016 Year: 2016
Type of Publication: Article Keywords: Environmental Effects, Flashover Voltage, High Voltage Composite Insulators, Mica Filler
  • Loai Nasrat
  • Ziad M. Ali
  • Mostafa M. Dardeer
  • RadyahTawfiq
Journal: IJEIR Volume: 5
Number: 2 Pages: 168-172
Month: March
ISSN: 2277-5668
This paper presents an experimental measurements of ac 50 Hz flashover voltage (kV) of hydrophobic polyester and composite insulators under dry and some environmental conditions. Cylindrical rod polyester composite samples with varying concentrations (20 to 40 weight %) of mica have been prepared to improve the electrical and mechanical properties in addition to maximize the surface flashover voltage and decrease the erosion and tracking phenomena. By using five lengths for each concentration (0.5, 1, 1.5, 2, and 2.5) cm each test was repeated five times on each sample under the same conditions to check the accuracy of the results. Results showed that electrical properties of composite were found to increase with mica concentration at 2.5cm sample length flashover voltage reaches to 25.5kV for samples without filler and 50.41 kV for samples containing 40% of mica filler in dry condition. A comparison between five different conditions showed higher flashover voltage for samples in dry condition than that of samples in (wet, 5wt.% sodium chloride, 10wt.% sodium chloride, and 10wt.% nitric acid )conditions at all filler concentrations. Mechanical properties such as compressive and tensile strength were found to decrease with mica concentration.

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