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Measurement on the permittivity and propagation velocity of used insulation oil at UHF Band using time domain reflectometry  

Goo, Sun-Geun (한전 전력연구원 전력계통연구소)
Ju, Hyoung-Jun (한전 전력연구원 전력계통연구소)
Park, Ki-Jun (한국 전력공사 전력연구원 전력계통연구소)
Han, Ki-Seon (한전 전력연구원 전력계통연구소)
Yoon, Jin-Yul (한전 전력연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.57, no.11, 2008 , pp. 2011-2014 More about this Journal
Abstract
We measured the permittivity and electromagnetic wave propagation velocity of used insulation oil with wide frequency range including ultra-high frequency by time domain reflectometry. The permittivity or propagation velocity is essential for locating discharge faults of oil filled power transformer. We derived 2.21 as a permittivity and $2.03{\times}10^8 m/s$ as a velocity from the measurement of pulse travelling time along a coaxial line filled with used insulation oil or air. The permittivity measurement system we designed shows high measurement accuracy and the convenience for field use.
Keywords
Permittivity; Used Insulation Oil; Propagation Velocity; Time Domain Reflectometry;
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