How sure to if need to replace an bone fiber liner epoxy fiberglass fuse tube ?
A :The outer surface of the bone fiber liner epoxy fiberglass fuse tube
It should be checked for excessive weathering. If the gray polyurethane paint has completely faded, so the underlying polyurethane paint has completely faded.can be seen, the condition of the fuse tube is still acceptable.
However, the tube should be inspected more intensively. If On the other hand, the paint has completely faded and there is Fiberglass fuse tube appears visibly worn or fuzzy.The tube may not be strong enough to withstand the the internal pressure generated when the fault current is interruption. In this case, the fuse tube should be replaced.
The condition of the interrupting bone fiber liner is Identification. Visual inspection of the arc extinguishing wire.At the end of the fuse tube. The bone fiber liner is dark gray.
The color of the If the color of the liner material is not obvious caused by soot buildup from previous fault current interruptions. Check the date of manufacture of the fuse tube, located
on the label above the lower ferrule.
B :Each time the fuse operates, the arc in the fuse tube causes a small amount of fuse damage.
erosion of the arc-extinguishing liner, which increases the temperature of the inner
diameter of the tube. After several operations, less in the case of high seismic level faults – the liner may no longer be sufficient to properly extinguish the arc. If the liner
becomes too thin, the material may crack and peel.Wipe the end of the fuse tube with a cloth to remove any excess dust and debris. To account for small changes
in the degree of erosion, measure the diameter of the liner at two different points and record the larger of the two points. If this diameter is greater than 1116 inches (17.5 mm) for a 100-amp fuse tube, or 1 inch (25.4 mm) for a 200-amp fuse tube.should be replaced with a new fuse tube. If the liner is badly chipped or there is no liner material.end of the fuse tube, it should be replaced with a new fuse tube.
C :Although the interrupter liner is designed to prevent an explosion to withstand normal atmospheric humidity, it is important to have water may accumulate if the fuse tube is inadvertently left dangling, it can cause severe swelling of the fuse tube and may affect the life of the damage to the liner. If this swelling occurs, the fuse body connection will be damaged.
may become trapped in the tube during operation, thus preventing prevent the fuse tube from falling into the open position. If swelling of the liner is visible, the fuse tube should be replaced with a new fuse tube. If the diameter of a 100 amp fuse tube is 100 amps
smaller than 1532 inches (12 mm), or less than 200 amperes in diameter.Any point inside the fuse tube is less than ¾ in. (19 mm).of inner diameter, the fuse tube should be replaced with
a new fuse tube.