Transmission Line Jumper Swings and Limiting Swing Angles

摘要

The extra high voltage transmission line towers may have to be designed with each cross-arm supporting more than one phase if the line has more than two circuits on the same support. Similar situation will be encountered in a double circuit tower if the conductor configuration is double delta. In such cases if normal values of swing angles of jumpers are adopted in an angle tower design, the cross-arm will be very heavy, thus making the tower uneconomical. To keep down the swing angles and to make use of steel economically it will be necessary to restrain the jumper movement due to wind. A method of doing this is to suspend an adequate weight from a dummy insulator attached to the cross-arm and anchor the jumper to the insulator. Wind tunnel tests were conducted on the jumper with such a restraining system to assess its efficacy. The details of this method along with the experimental results are discussed in the report.