| Abstrakt: |
In the past few decades, polymer (silicon rubber—SIR) insulators have been widely used in HV (high voltage) transmission and distribution systems, because of their immanent anti-contamination property, excellent dielectric strength, lower volume and high strength-to-weight ratio. Nevertheless, under the operation, it degrades organic material in polymer insulators due to pollution, acidic rains, UV radiation, electrical stresses, mechanical stresses and bird pecking. Due to this, sheds of SIR insulators are damaged. As a result, creepage distance and flash-over strength decrease, and surface conductivity increases. This paper presents an experimental evaluation of 6, 12 and 25% shed-damaged 33-kV SIR insulator with salt contamination and compares the results with 33-kV SIR virgin sample. As compared with virgin sample (no damage specimen), with 6% shed-damaged area flash-over voltages 8.45, 9.16 and 12.06%, with 12% shed-damaged area flash-over voltages 17.60, 27.48 and 30.17%, with 25% shed-damaged (up to rod) area flash-over voltages 37.32, 40.45, and 41.38% decreased under dry, wet and salt-contaminated conditions, respectively. [ABSTRACT FROM AUTHOR] |
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