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Piezoelectric sensors based on thermo-formed and cold piezoelectrets for acoustic detection of electrical discharge into power transformers

Grant number: 11/04960-3
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2011
Effective date (End): July 31, 2013
Field of knowledge:Engineering - Electrical Engineering - Electrical Materials
Principal researcher:Ruy Alberto Corrêa Altafim
Grantee:Yvan Gutnik
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


Over the past three years, the piezoelectret transducers base Teflon® FEP films as thermo-formed as cold formed have shown significant progress, and could compete on price and functionality with ceramic and crystals transducers. Technologically, they are still in the industrial prototype phase, but it can be adapted for field applications. Because present high piezoelectric coefficients, often exceeding 300 pC/N and cut off frequencies around 100 kHz, these transducers are excellent candidates for fabrication of dedicated sensors for acoustic monitoring of electrical discharges that occur into power transformers, particularly those for power distribution. Added to these features its flexibility, low cost and ability to be built in large sizes. This research aims to build and characterize these new acoustic sensors. (AU)

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
GUTNIK, Yvan. Study of piezoelectrets for detecting partial discharge in transformers. 2014. Master's Dissertation - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos São Carlos.

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