Polarization and depolarization current of linear low density polyethylene-natural rubber nanocomposite subjected to electrical tracking and moisture
Polymeric nanocomposites are widely used for high voltage outdoor insulating application due to their efficient electrical performance. Recently, SiO2, TiO2 and MMT nanofillers are used as fillers because there are listed as the main nanofiller commonly used in electrical engineering due to the incr...
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| Format: | Thesis |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7804/ http://eprints.uthm.edu.my/7804/1/NOR_AKMAL_BINTI_MOHD_JAMAIL.pdf |
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| Summary: | Polymeric nanocomposites are widely used for high voltage outdoor
insulating application due to their efficient electrical performance. Recently, SiO2,
TiO2 and MMT nanofillers are used as fillers because there are listed as the main
nanofiller commonly used in electrical engineering due to the increases of effective
activation energy. Natural rubber (NR) is used because the nature of the interphase is
found to affect viscoelasticity and it develops several interphases with the Linear
Low-Density Polyethylene (LLDPE) matrix. This thesis presents the outcome of an
experimental study which has been carried out to determine the conductivity level
and dielectric response function of the LLDPE-NR compound, filled with different
amount of SiO2, TiO2 and MMT nanofillers using Polarization and Depolarization
Current (PDC) measurement technique. LLDPE and NR with the ratio composition
of 80:20 were selected as a base polymer. The PDC testing was done on samples at
various conditions: without any defect (normal condition), wet condition (moisture
absorption) and after electrical tracking effect condition based on BS EN
60587:2007 standards. One of the problems associated with outdoor polymeric
insulators is the tracking of the surface which can directly influence the reliability of
the insulator. The amount of water content can be used to monitor the dielectric
quality of insulation and as an indicator of possible deterioration for outdoor
degradation. Besides PDC, surface morphology analysis using FESEM was also
conducted to study the changes in physical structure which can explain the
conductivity and response function. This research found that an addition of certain
weight percentage of nanofiller and NR into the LLDPE improved conductivity level
of the insulator. LLDPE-NR/TiO2 at 5 wt% has become the best sample in terms of
the lowest conductivity in normal and under electrical tracking effect. Besides, this
sample has the fastest time response under electrical tracking and moisture
condition. This investigation has successfully identified the PDC pattern,
conductivity and dielectric response function of LLDPE-NR nanocomposite. Results
show that different compositions as well as the surface physical conditions affect the
PDC measurement results. |
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