Degraded Paper
This is a fragment of degraded paper insulation
from transformer oil. The bond between the fibers is
as strong or stronger than the forces holding the individual fibers together. The
Degree of polymerization (DP) for these fibers is below 150.
New paper typically has a DP greater than 1000.
Transmitted Off Crossed Circular Polarized Light
Definition/Function:
Paper fragments are particles consisting of more than one paper fiber bound together.
They are the result of chemically or mechanically
degraded paper.
Significance in the Environment:
If paper fragments of this type are present at a significant level in a transformer oil
sample then at some location in the transformer the
paper insulation has lost all strength and has failed. The transformer may continue to
function normally for some time but is a candidate
for sudden failure due to the loss of insulation between windings at some point.
Characteristic Features:
Associated Particles:
References:
