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A three-phase ultra-high voltage transmission test line at EPRI's Project UHV was energized in January 1975. Analyses of the audible noise performance of the first six-months of energization are presented. The result of long-term energization during foul-weather are reported in terms of cumulative frequency distributions, lateral profiles and frequency spectra. Audible noise variations with voltage in rain and fair weather are also presented. Results are compared with calculations made on the basis of single-phase tests. Good agreement between measured and calculated performances is demonstrated.