magnetic fluids in power engineering -...
TRANSCRIPT
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Magnetic Fluids in Power Engineering
TE
CH
NIC
K Á U N IV
ER
ZIT
A
KO Š I C E
FEI
Student: Ing. Jozef KirálySupervisor: prof. Ing. Roman Cimbala, PhD.
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• Magnetic fluids in general• Transformer oil based magnetic fluid• Dielectric spectroscopy as a diagnostic method• Experimental base• Example of measured data• Conclusion
Content of the article
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Magnetic fluidMagnetic fluid
Magnetic fluid is liquid, which consist from carrier fluid and ferromagnetic nanoparticles coated by surface active substance.
Components:•Magnetic nanoparticles – carrier of magnetic properties•Surfactant – oleic acid•Carrier liquid – water, transformer oil etc.
Oleic acid
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Transformer oil based magnetic fluid
Oleic acid
Crystal structure of magnetite
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Dielectric spectroscopy
• One of the non-destructive methods of diagnostics of high voltage insulation system in general is dielectric spectroscopy. This method is based on measurement of current in time and frequency domain.
∑=
−+=
n
i i
mi
tI
R
Uti
1
exp)(τ
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Experimental base
• two samples of magnetic fluid based on common transformer oil (Sample A, Sample B)
• two different concentration for both sample
• cylindrical electrode system with 2 cm diameter and 1 mm gap
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Measured data
Measured i(t) curve of pure carrier liquid for sample A and B
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Measured i(t) curve of oleic acid
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Measured i(t) curve of sample A 0,25% MF
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Measured i(t) curve of sample A 0,5% MF
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Measured i(t) curve of sample B 35Gs MF
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Measured i(t) curve of sample B 70Gs MF
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Conclusion
• Confirmed same trend of curves• Significant anisotropy of i(t) curves caused by presence
of acting external magnetic field • Influence of nanoparticles amount to start-time of
polarisation processes
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Thanks for your attention