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  • New composite insulator string designed for 400 KV overhead line using statistical insulation coordination procedure
    Vižintin, Stane ...
    The progress in the field of overhead line insulation, good experiences with composite insulators on the 110 kV level and appearance of some new insulationcoordination computersupported techniques ... led us to the conclusion that for the next 400 kV overhead line project in Slovenia composite insulators should be used for the first time. In order to define the insulation level, a thorough overvoltage analysis was accomplished. Calculations and computer simulations were used to assess the temporary and transient (lightning and switching) overvoltages regarding their frequency andamplitudes. The lightning activity was represented by the actual highresolution lightning density map. With a bunch of data collected it was possible to perform a statistical insulation coordination procedure to determine the required insulation level. Some other system aspects were considered. The tests in the high-voltage laboratory showed appropriate dielectric strength for the insulator string that was designed at the beginning. Unfortunately the corona voltage inception level was too low due tounfavourable electric field distribution for the contemporary environmental requirements. Another solution is needed, so the insulator string with new metal fittings (potential rings, arching horns) is being designed. The paper shows results of the developed insulation coordination procedure in detail and dielectric tests.
    Source: Proceedings of the 16th International Symposium on High Voltage Engineering, Cape Town, South Africa, 24-28 August 2009 [Elektronski vir] ([6] str.)
    Type of material - conference contribution
    Publish date - 2009
    Language - english
    COBISS.SI-ID - 33315077

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