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The new type of conductor reduced the drag coefficient (15%) and wind noise (10dBA) was developed. The authors carried out the water flow tunnel test, wind tunnel test and full-scale field test for confirming the reducing mechanism of drag coefficient and evaluating the reduction value of drag coefficient. This paper reports these test results and some evaluations. Keywords: overhead transmission line, low wind pressure type conductor, wind tunnel test, water flow tunnel test, field test, drag coefficient