Abstract
In the technical report relating to the insulation design of overhead transmission lines published by The Institute of Electrical Engineers of Japan(1), two calculation methods are indicated with respect to a distance between two circuits in overhead transmission lines.
One of the methods is an empirical formula, while another is intended to determine the range of fluctuation in swinging motion when the wind having a specific spectrum and spatial structure has acted on a conductor. The author has given additional development to the latter method, thus successfully establishing a more rational method to determine a necessary distance between two circuits.
That is to say, in the conventional method, it was presumed that the wind having identical characteristics and structure would act upon the conductor on the windward side, differently from that on the leeward side. In practice, however, the wind which has acted upon the conductor on the windward side acts upon the conductor on the leeward side with a certain time lag, so both motions are not an independent phenomenon. As a result of making studies considering this point, the author has found that the fluctuation in distance becomes far smaller than the value calculated by the conventional method, consequently making it clear that the width under transmission lines can be much reduced.
