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author:

Jiang, Xiubo (Jiang, Xiubo.) [1] (Scholars:江修波) | Zhang, Tao (Zhang, Tao.) [2] | Huang, Yanjie (Huang, Yanjie.) [3]

Indexed by:

EI Scopus PKU CSCD

Abstract:

The return voltage measurement can effectively detect the moisture content of solid insulation in transformer, but it is difficult to get the definite diagnostic results from the return voltage polarization spectrum with local peaks. The theory of extended Debye model is introduced, the relationship among insulation polarization, aging process and equivalent circuit parameter is established, and the variation law of characteristic variables and polarization spectrum induced by the variation of electric parameters are simulated and analyzed. Simulative results show that, the dominant time constants can diagnose the insulation conditions of transformers with different geometric capacitances, which is an effective characteristic variable. The shape of polarization spectrum is also an effective characteristic variable of insulation diagnosis. The shape of its terminal part and its return voltage can reflect the aging condition of solid insulation. Test results validate the effectiveness of simulation conclusions.

Keyword:

Aging of materials Capacitance Electric insulation Equivalent circuits Moisture determination Plasma diagnostics Polarization Power transformers

Community:

  • [ 1 ] [Jiang, Xiubo]College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350002, China
  • [ 2 ] [Zhang, Tao]Electrical Engineering and Renewable Energy School, China Three Gorges University, Yichang 443002, China
  • [ 3 ] [Huang, Yanjie]College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350002, China

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Source :

Electric Power Automation Equipment

ISSN: 1006-6047

CN: 32-1318/TM

Year: 2011

Issue: 2

Volume: 31

Page: 31-35

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 4

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