AC AND LIGHTNING PERFORMANCE OF FIBERGLASS CROSSARMS AGED IN 115 KV TRANSMISSION-LINE

This paper presents the results of an investigation of the electrical performance of 115 kV transmission line fiberglass crossarm used by Mi ssissippi Power & Light Company. A transmission line fiberglass crossa rm removed from service and companion crossarms stored outdoors but no t in service were examined. The evaluation of electrical performance w as based on flashover voltage value at AC voltage and standard lightni ng impulse as well as under dry and wet conditions. The tests were per formed in the Mississippi State University High Voltage Laboratory. Th e obtained flashover voltages show no large difference in electrical s trength of fiberglass crossarms removed from service and those stored outdoors. The Added CFO voltage by fiberglass crossarm to the porcelai n suspension insulators is presented versus the length of the fibergla ss crossarm for dry and wet conditions.