Trap parameters analysis of oil-paper insulation by thermally stimulated depolarization current

Yuanwei Zhu, Shengtao Li, Tengfei Li, Daomin Min, Bo Ma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

As the core equipment of the DC transmission system, the converter transformers have been widely used in power systems. The space charge accumulation, transport and dissipation in oil-paper insulation are more complex than in polymeric insulating materials. Insulation damage caused by space charge is one of the main reasons for transformer fault, and has become a direct threat to the safe operation of the power system. Thermally stimulated depolarization current (TSDC) test is one of the important methods to analyze trap energy levels and charge transport properties of dielectric. TSDC test with different bias voltages (-25V, -12.5V, +25V and +50V) in temperature range of -100 °C ∼ 160 °C is used to distinguish dipole TSDC peaks from space charge ones in oil-paper insulation structure. The experimental results show that the -75 °C, 50 °C TSDC current peaks are not caused by space charge and the 150 °C peak meet the space charge characteristics. Activation energy, polarization intensity and relaxation time of each TSDC peak have been calculated correspondingly. The test has significance for better understanding of space charge accumulation, distribution and charge transport properties in oil-paper insulation, and is of great value for mechanism analysis of breakdown in oil-paper insulation.

Original languageEnglish
Title of host publicationProceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages108-111
Number of pages4
Volume2015-October
ISBN (Print)9781479989034
DOIs
Publication statusPublished - 2015 Oct 8
Externally publishedYes
Event11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015 - Sydney, Australia
Duration: 2015 Jul 192015 Jul 22

Other

Other11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015
CountryAustralia
CitySydney
Period15/7/1915/7/22

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Keywords

  • Oil-paper insulation
  • space charge
  • thermally stimulated depolarization current

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Zhu, Y., Li, S., Li, T., Min, D., & Ma, B. (2015). Trap parameters analysis of oil-paper insulation by thermally stimulated depolarization current. In Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials (Vol. 2015-October, pp. 108-111). [7295220] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPADM.2015.7295220