October 1, 2014
High Wire act now in Cass County.
Helicopter crews are doing maintenance work on transmission towers belonging to the Omaha Public Power District.
Personnel for Haverfield Aviation of Pennsylvania are replacing what are called "knee braces" on more than 1,100 transmission towers stretching from near Rulo, Nebraska to Sioux City, Iowa.
The Cassgram reports that these H-frame structures hold transmission lines that carry up to 345,000 volts of electricity. The braces are used to support the cross arms on these structures.
It takes approximately 15 minutes on each transmission structure to replace two knee braces. Use of the helicopters allow the replacement work to be done quickly and more efficiently while also allowing the transmission lines to remain energized, says OPPD.