Some examples of bullet burnouts we located and repaired (Click on pictures for larger images).
is what is left after a catastrophic bullet burnout. The burnout was
determined to be 280 feet up the tower by using a sweep generator
connected at the base. The reflected wave pattern can be analyzed
to give the distance to the fault to within a couple of feet over a
distance of several hundred feet. We knew a bullet burnout had ocurred
as soon as the line was opened up at the base of the tower due to a
strong smell of chlorine gas which is released when the bullet's teflon
insulator burns up.
is the same transmission line opened up 20 feet down at the next
flange. There was no burnout here but some debris from the fire landed
on the teflon insulator below. The repair was made by removing 4
sections of line and cleaning the outer conductors like a cannon barrel
would be cleaned. Three of the center conductors and their bullets were
is a burnout that ocurred at the "tee" of an FM antenna array. The
burnout was found in this case by a visual inspection. The copper and
brass components were discolored by the heat.