Header menu link for other important links
X
Investigation on insulation performance of thermally aged natural ester oil impregnated pressboard
Published in Institution of Engineering and Technology
2019
Volume: 13
   
Issue: 8
Pages: 1194 - 1202
Abstract
An attempt is made to understand the effect of thermal ageing on natural ester oil impregnated pressboard material. Surface discharge inception voltage of natural ester oil impregnated pressboard material is reduced drastically under AC, harmonic AC voltages and with DC voltages with high ripple content. Phase-resolved partial discharge studies show an increase in the number of discharges for natural ester oil impregnated pressboard (OIP) aged at higher temperature, under AC and harmonic AC voltages with different total harmonic distortions. Surface potential measurement study complies with results obtained by surface discharge inception voltage. It indicates the presence of high-density charge traps evolved as a function of ageing time and temperature. Laser-induced breakdown spectroscopy analysis is carried out to understand the characteristic variation with thermally aged OIP material. A decrease in plasma temperature is observed for sample aged at higher temperature. Differential scanning calorimetric studies indicate reduction in peak temperature with thermally aged specimens. Ageing observed to affect mechanical strength of the cellulosic material, as indicated by tensile test. Dielectric response spectroscopy study indicates that with an increase in thermal ageing, the permittivity, tan(δ), DC conductivity and relaxation time have increased. A reduction in activation energy of the aged material is observed, which indicates the status of the OIP material. © The Institution of Engineering and Technology 2019.
About the journal
JournalIET Science, Measurement and Technology
PublisherInstitution of Engineering and Technology
ISSN17518822
Open AccessNo
Concepts (16)
  •  related image
    Activation energy
  •  related image
    Atomic emission spectroscopy
  •  related image
    Esters
  •  related image
    Harmonic analysis
  •  related image
    Partial discharges
  •  related image
    Tensile testing
  •  related image
    Thermal aging
  •  related image
    CELLULOSIC MATERIAL
  •  related image
    Dielectric response
  •  related image
    Differential scanning calorimetric
  •  related image
    DISCHARGE INCEPTION VOLTAGES
  •  related image
    INSULATION PERFORMANCE
  •  related image
    PHASE RESOLVED PARTIAL DISCHARGES
  •  related image
    SURFACE POTENTIAL MEASUREMENTS
  •  related image
    Total harmonic distortion (thd)
  •  related image
    Surface potential