Zusammenfassung
Test apparatus and procedures were developed to test energized,
non-contaminated, 120 kV system insulators under simulated freezing
rain conditions. The flashover performances were compared between
non-ceramic composite transmission line insulators and standard
porcelain 5~ x 10 inch suspension insulators. Standard and long leak
Multicone porcelain insulators were also compared in the icing tests to
standard porcelain station post insulators. Icing tests at several voltage
stresses provided the full flashover. range of the insulators from the
minimum or zero flashovers in ten trials up to the maximum or 10
flashovers in 10 trials. Using the desired insulator voltage stress
flashover curve for specific insulator types and the voltage stress
applied to the insulator. the comparative probability of flashover due
to ice storms on the system can be evaluated for 120 kV, 230 kV and
345 kV systems.
Nutzer