| 摘要 |
PROBLEM TO BE SOLVED: To provide an insulator equipped with a means to reduce noise, even when an airflow has a speed in the vertical direction with respect to the insulator. SOLUTION: A shed 31 having a diameter larger than the shed diameter of the insulator is disposed at an upper part of the insulator 1. The shed 31 has an elliptical or oval cross section. The airflow in the vertical direction of the insulator 1 is reduced, and noise caused by pressure fluctuation on the shed of the insulator 1 due to vortexes generated at positions downstream of a structural component such as a collector shoe placed on top of the insulator 1 is suppressed. COPYRIGHT: (C)2005,JPO&NCIPI
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