Northwest Lineman College
TRANSMISSION TECHNICIAN CERTIFICATION PROGRAM
CURRICULUM SAMPLE EXCERPTS
STEEL STRUCTURE MAINTENANCE
Any tower component where two pieces of metal are joined and one is stationary while the other one moves will eventually need replacing or fixing.
Insulator support brackets In the photo captioned, Static wire support bracket, the movement of the static wire has caused the nut to fall off, the bolt is backed out and the static wire is in danger of falling. Any tower component where two pieces of metal are joined and one is stationary while the other one moves will eventually need replacing or fixing. In the photo, Vertical insulator string bracket, the tension keeps the nuts on the U-bolt from backing off but the bottom of the U, where the insulator hook rests is subjected to extreme wear.
Static wire support bracket
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The bracket supporting the static wire can be replaced by attaching a Gin-pole to the steel member above the bracket and using a hoist to hold the weight while the bracket is changed out. Since the static wire only has to be lifted enough to relive the pressure, the procedure can be accomplished live-line. When the bracket on the insulator string has to be replaced, the conductor would have to be supported and the insulator string removed.
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Vertical insulator string bracket
Arm (bridge) replacement
Transmission tower arms are replaced when there is storm damage or the tower is being uprated for more phase clearance. The bridge is replaced using a Gin-pole to lower and raise components or by helicopter. The job is done with the conductors off the tower, and is considered a harder job than inserting a new section into the tower to gain height. It would normally take the five man crew in the photo 1-2 days per tower to change the crossarm.
Chapter Two | Member Replacement
Arm (bridge) replacement
Steel H-frame The conductors and insulators are lowered and protected, then slings or chain hooks are attached at the lifting eyes to lower and raise the crossarm. The steel poles have studs welded on two sides so that workers can install steps as they climb.
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Steel H-frame
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NORTHWEST LINEMAN COLLEGE 7600 S MERIDIAN RD, MERIDIAN, ID 83642 PHONE: 888-LINEWORK FAX: 208-888-4275
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© 2016 Northwest Lineman College Published February 2016