Y. Sekii: Degradation of Low-density Polyethylene and Cross-linked Polyethylene by Partial Discharge
1070-9878/10/$25.00 © 2010 IEEE
Degradation of Low-density Polyethylene and Cross-linked
Polyethylene by Partial Discharge
Sekii Consulting Engineering
Funabashi, Chiba, 274-0825, Japan
To study the degradation of low-density polyethylene (LDPE)
and cross-linked polyethylene
by partial discharge (PD), experiments were conducted in a nitrogen (N
) and (N
gas atmosphere. After being subjected to the PD, samples were examined using atomic force
microscopy (AFM) and FTIR. The AFM images clearly revealed the creation of pits on the
surface of degraded samples. A large difference in the pit pattern was observed between samples
subjected to the PD in N
and those subjected to the PD in (N
). The FTIR spectra detected
in samples subjected to the PD in (N
) showed that carbonyl compounds were produced on
the surface of degraded LDPE.
Experiments were performed using an experimental system
incorporating GC-MS to measure the gas components produced during degradation. Results
of experiments showed that carbon dioxide (CO
) is produced when LDPE and XLPE are
subjected to the PD in an oxygen-containing atmosphere. The amount of CO
was found to
increase concomitantly with the period of voltage application and oxygen concentration in the
area where PD occurs. Based on experimental results, the processes of LDPE and XLPE
degradation by PD were examined along with the antioxidant effect on degradation.
— partial discharge (PD), degradation, LDPE, XLPE, antioxidant, AFM, FTIR,
GC-MS, absorbance, carbonyl compound.
insulating materials are widely used in
electrical power equipment. These materials are known to
be deteriorated when they are subjected to partial discharges
(PD) [1–6]. To analyze that deterioration, observations of
samples using optical or electron microscopy are widely
adopted along with analyses of substances produced
through deterioration using FTIR spectroscopy [2, 7, 8].
Moreover, observation of samples using atomic force
microscopy (AFM) is useful to grasp the degradation of
aged dielectric materials [9, 10].
To study the influence of oxygen on deterioration of
low-density polyethylene (LDPE) by PD, the author
conducted experiments in a mixed nitrogen and oxygen
) atmosphere. The author has reported degraded
samples that were examined using AFM and FTIR .
The author also conducted experiments, using an
experimental system incorporating GC-MS, to measure the
gas constituents produced during degradation. Based on
results of those experiments, the author elucidated the
mechanism of deterioration by PD and effects of antioxidants
on deterioration by PD [12, 13].