AUDIBLE NOISE PERFORMANCE OF 6-RAIL CONDUCTORS ON A 765-KV DOUBLE CIRCUIT TEST LINE

To satisfy an annual rate load growth of approximately 10% per year, K orea Electric Power Corporation (KEPCO) has been studying the use of d ouble circuit 765-kV transmission lines. Since this would be the first application in the world for such lines, a 765-kV test line was built near the Yellow Sea to pain experience with this higher voltage. A pr imary corona phenomena that is important for conductor selection is au dible noise (AN) due to corona. This paper presents the results of lon g-term measurements of AN from the 765-kV double circuit test line usi ng a bundle of 6-483.8 mm(2) conductors at Korea Electric Power Resear ch Institute's (KEPRI) 765-kV test station. The analysis oi the data s hows that the 6-Rail conductor bundle satisfies the AN criterion of 50 dB(A) under rainy weather conditions.